Sinep Virus

Virus Name: Sinep Aliases: V Status: Rare Discovered: March, 1993 Symptoms: .COM file growth; file date/time changes; system hangs; decrease in total system & available free memory Origin: Unknown Eff Length: 644 Bytes Type Code: PRhCK - Parasitic Resident .COM Infector Detection Method: Sweep, AVTK, F-Prot, IBMAV, ViruScan, NAV, NAVDX, VAlert, PCScan, ChAV, Sweep/N, AVTK/N, NShld, NProt, IBMAV/N, Innoc, NAV/N Removal Instructions: Delete infected files General Comments: The Sinep virus was submitted in March, 1993. Its origin is unknown. Sinep is a memory resident infector of .COM programs including COMMAND.COM. When the first Sinep infected program is executed, the Sinep virus will install itself memory resident at the top of system memory but below the 640K DOS boundary, hooking interrupt 22. Interrupt 12's return will not be moved. Total system and available free memory, as indicated by the DOS CHKDSK program, will have decreased by 672 bytes. Once the Sinep virus is memory resident, it will infect .COM programs when they are executed. Infected programs will have a file length increase of 644 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 Sinep infected programs. System hangs may occur when infected programs are executed.