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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.
Due to a bug in the virus, only the first EXE file in any directory is infected. Abraxas-infected files will become 1,171 bytes in length and contain Abraxas' viral code. The file's date and time in the DOS disk directory listing will be set to the system date and time when infection occurred.
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 ...
File virus 1987-10 Seattle: Virus coders created many variants of the virus, making Jerusalem one of the largest families of viruses ever created. It even includes many sub-variants and a few sub-sub-variants. WannaCry: WannaCrypt, WannaCryptor Windows Ransomware Cryptoworm 2017 World North Korea: WDEF WDEF A Classic Mac OS 1989.12.15
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.