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Acid is a computer virus which infects .COM and .EXE files including command.com. Each time an infected file is executed, Acid infects all of the .EXE files in the current directory. Later, if an infected file is executed, it infects the .COM files in the current directory.
This is an accepted version of this page This is the latest accepted revision, reviewed on 2 February 2025. Computer program that modifies other programs to replicate itself and spread Hex dump of the Brain virus, generally regarded as the first computer virus for the IBM Personal Computer (IBM PC) and compatibles A computer virus is a type of malware that, when executed, replicates itself by ...
The ARCV group of virus writers created close to 100 new viruses in the 3 months they were active, [2] before they were raided by New Scotland Yard in December, January, and February 1993. [ 3 ] Select ARCV viruses were still being circulated at least through 1998, based on virus tables from the Computer Incident Advisory Capability .
ABC, discovered in October 1992, is a memory-resident, file-infecting computer virus which infects EXE files and may alter both COM and EXE files. ABC activates on the 13th day of every month. Upon infection, ABC becomes memory-resident at the top of system memory but below the 640 K DOS boundary and hooks interrupts 16 and 1C.
AIDS II works by first finding an uninfected EXE file in the working directory and then creating a companion COM file with the viral code. The COM files will always be 8,064 bytes in length, with a timestamp corresponding to the time of infection. After creating the new COM file, the virus then plays a loud note, and displays the following ...
The virus destroys all executable files on infected machines upon every occurrence of Friday the 13th (except Friday 13 November 1987 making its first trigger date May 13, 1988). Jerusalem caused a worldwide epidemic in 1988. [20] November: The SCA virus, a boot sector virus for Amiga computers, appears. It immediately creates a pandemic virus ...
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EXE file, Ontario.1024 goes memory resident and infects files of these types upon being opened. COMMAND.COM is infected using a special routine. Infected files will increase in size by 1,024 bytes. However, when Ontario.1024 is in memory, no increase in file size will be observed due to the virus' stealthing.