KLF-356 Virus

Virus Name: KLF-356 Aliases: V Status: Rare Discovered: December, 1992 Symptoms: .COM file growth Origin: USSR Eff Length: 356 Bytes Type Code: PRaCK - Parasitic Resident .COM Infector Detection Method: AVTK, IBMAV, Sweep, F-Prot, ViruScan, NAV, NAVDX, VAlert, PCScan, ChAV, Sweep/N, NShld, Innoc, NProt, AVTK/N, LProt, NAV/N, IBMAV/N Removal Instructions: Delete infected files General Comments: The KLF-356 virus was submitted in December, 1992 and is originally from the USSR. KLF-356 is a memory resident infector of .COM programs, including COMMAND.COM. When the first KLF-356 infected program is executed, the KLF-356 virus will install itself memory resident in a "hole" in allocated system memory at approximately 0000:025E. Interrupt 21 will be hooked by the virus. Total system and available free memory, as indicated by the DOS CHKDSK program, will not be altered. Once the KLF-356 virus is memory resident, it will infect .COM programs, including COMMAND.COM, when they are executed. Infected programs will have a file length increase of 356 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 strings are visible within the KLF-356 viral code: "KLF" "The KLF3" The first of these text strings occurs very near the beginning of the infected file, and the last text string occurs in the viral code at the end of the file. KLF-356 doesn't appear to do anything besides replicate.