Bunny Virus

Virus Name: Bunny Aliases: Bunny.497 V Status: New Discovery: January, 1996 Symptoms: .COM file growth; file date/time seconds = "62"; decrease in available free memory Origin: Unknown Eff Length: 497 Bytes Type Code: PRhC - Parasitic Resident .COM Infector Detection Method: AVTK, NAV, NAVDX, ViruScan, IBMAV, F-Prot, PCScan, ChAV, AVTK/N, NAV/N, NShld, IBMAV/N, Innoc Removal Instructions: Delete infected files General Comments: The Bunny virus was received in January, 1996. Its origin or point of isolation is unknown. Bunny is a memory resident infector of .COM files, but not COMMAND.COM. When the first Bunny infected program is executed, this virus will install itself memory resident at the top of system memory but below the 640K DOS boundary, not moving interrupt 12's return. Available free memory, as indicated by the DOS CHKDSK program from DOS 5.0, will have decreased by 544 bytes. Interrupt 21 will be hooked by the virus in memory. Once the Bunny virus is memory resident, it will infect .COM files when they are executed. Infected files will have a file length increase of 497 bytes with the virus being located at the end of the file. The program's date and time in the DOS disk directory listing will not appear to be altered, though the seconds field will have been set to "62". The following text strings are visible within the viral code: "COMMAND.COM" "BUGS BUNNY"