Slava Virus

Virus Name: Slava Aliases: Slava.492 V Status: New Discovered: July, 1995 Symptoms: .COM file growth; decrease in available free memory Origin: Unknown Eff Length: 492 - 501 Bytes Type Code: PRhC - Parasitic Resident .COM Infector Detection Method: F-Prot, AVTK, VAlert, Sweep, NAV, NAVDX, IBMAV, ViruScan, PCScan, ChAV, Sweep/N, NAV/N, IBMAV/N, NShld, AVTK/N, Innoc 4.0+ Removal Instructions: Delete infected files General Comments: The Slava or Slava.492 virus was received in July, 1995. Its origin or point of isolation is unknown. Slava is a memory resident infector of .COM files, but not COMMAND.COM. When the first Slava infected program is executed, this virus will become 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 2,096 bytes. Interrupt 21 will be hooked by the virus in memory. Once the Slava virus is memory resident, it will infect .COM files, but not COMMAND.COM, when they are executed. Infected .COM files will have a file length increase of 492 to 501 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. The following text string is visible within the viral code in all infected programs: "command" It is unknown what the Slava virus may do besides replicate.