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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.
Instead of searching for a file to infect, Alabama searches for a file to cross-reference. The virus modifies the FAT entry so that when the user executes one file, another will appear. For instance, on a machine where Alabama is resident, executing PROGRAM1.EXE on a Friday may cause the virus to search for another program and find PROGRAM2.EXE.
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.
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.
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 Ada virus mainly targets .COM files, specifically COMMAND.COM. AGI-Plan: Month 4-6 DOS Mülheim: AGI-Plan is notable for reappearing in South Africa in what appeared to be an intentional re-release. AI DOS AIDS: AIDSB, Hahaha, Taunt DOS 1990 AIDS is the first virus known to exploit the DOS "corresponding file" vulnerability. AIDS II: DOS ...