Ai22.1659
Description Ai22.1659
It is a harmless memory resident parasitic virus. It installs itself memory resident and replicates only under DOS 5.x and 6.x. It hooks INT 21h and writes itself to the end of .COM and .EXE files that are executed. While installing the virus also infects the C:COMMAND.COM file. The virus does not manifest itself in any way, it contains the ID-text:
Ai22
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ExeBug.d
Description ExeBug.d
This is a family of boot and multipartite stealth viruses. They hook INT 13h and write themselves to the MBR of the hard drive and boot sectors of the floppy disks. Multipartite viruses of that family overwrite the headers of EXE file with a virus dropper. Other viruses overwrite the EXE files with trojan programs that erase the hard drive sectors when infected files are executed.
It occupies two sectors and hooks INT 1Ch, but there is only the first virus sector in my collection, and it is not enough for complete analysis.
ExeBug.Hooker
Description ExeBug.Hooker
This is a family of boot and multipartite stealth viruses. They hook INT 13h and write themselves to the MBR of the hard drive and boot sectors of the floppy disks. Multipartite viruses of that family overwrite the headers of EXE file with a virus dropper. Other viruses overwrite the EXE files with trojan programs that erase the hard drive sectors when infected files are executed.
It overwrites the EXE files with a trojan that contains the text string:
HOOKER
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