Sluknov Virus

Virus Name: Sluknov Aliases: V Status: Rare Discovered: September, 1993 Symptoms: .COM file growth; decrease in total system & available free memory Origin: Unknown Eff Length: 867 - 875 Bytes Type Code: PRhCK - Resident Parasitic .COM Infector Detection Method: ViruScan, F-Prot, Sweep, NAV, ChAV, AVTK, NAVDX, VAlert, IBMAV, PCScan, NShld, Sweep/N, NAV/N, IBMAV/N, AVTK/N, Innoc 4.0+ Removal Instructions: Delete infected files General Comments: The Sluknov virus was submitted in September, 1993. Its origin or point of isolation is unknown. Sluknov is a memory resident infector of .COM programs, including COMMAND.COM. When the first Sluknov infected program is executed, the Sluknov virus will install itself memory resident at the top of system memory but below the 640K DOS boundary, not moving interrupt 12's return. Total system and available free memory, as indicated by the DOS CHKDSK program, will have decreased by 1,728 bytes. Interrupt 21 will be hooked by the virus in memory. Once memory resident, the Sluknov virus will infect .COM programs when they are executed. Infected programs will have a file length increase of 867 to 875 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 be altered. No text strings are visible within the viral code. It is unknown what Sluknov does besides replicate.