Small-178 Virus

Virus Name: Small-178 Aliases: V Status: Rare Discovered: February, 1993 Symptoms: .COM program growth; file date/time changes Origin: USSR Eff Length: 178 Bytes Type Code: PRxCK - Parasitic Resident .COM Infector Detection Method: Sweep, AVTK, F-Prot, ViruScan, IBMAV, PCScan, NAV, NAVDX, VAlert, ChAV, Sweep/N, NShld, Innoc, NProt, AVTK/N, NAV/N, IBMAV/N, LProt Removal Instructions: Delete infected files General Comments: The Small-178 virus was submitted in February, 1993, and is from the USSR. Small-178 is a memory resident infector of .COM programs including COMMAND.COM. When the first Small-178 infected program is executed, this virus will install itself memory resident in a "hole" in low allocated system memory, hooking interrupt 21. Total system and available free memory, as indicated by the DOS CHKDSK program, will not be altered. Once the Small-178 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 178 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 have been updated to the current system date and time when infection occurred. No text strings are visible within the viral code in Small-178 infected programs. Small-178 doesn't do anything besides replicate.