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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.
Scott's Valley is a very standard memory resident DOS file infector. Upon execution, it goes memory resident and infects COM and EXE files as they are opened. It does not infect COMMAND.COM. Because Scott's Valley has never been fully analysed, it is unknown whether it also infects OVL files as most Jerusalem variants do.
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.
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.
It can re-infect .EXE files, and will increase the size of already infected .EXE files by 1,808 bytes. [10] Jerusalem-VT1: If the virus is memory-resident, it will delete any file run on Tuesday the 1st. [10] Jerusalem-T13: The virus causes .COM and .EXE files to grow by 1,812 bytes. If the virus is memory-resident, it will delete any program ...