Tu-482 Virus

Virus Name: Tu-482 Aliases: V Status: New Discovered: February, 1993 Symptoms: .COM file growth; decrease in total system and available memory Origin: USSR Eff Length: 482 Bytes Type Code: PRhCK - Parasitic Resident .COM Infector Detection Method: Sweep, AVTK, F-Prot, ViruScan, IBMAV, NAV, NAVDX, VAlert, ChAV, Sweep/N, NShld, NAV/N, AVTK/N, NProt, IBMAV/N, Innoc Removal Instructions: Delete infected files General Comments: The Tu-482 virus was submitted in February, 1993, and is originally from the USSR. Tu-482 is a memory resident infector of .COM programs larger than approximately 8K, including COMMAND.COM. When the first Tu-482 infected program is executed, the Tu-482 virus will install itself memory resident at the top of system memory but below the 640K DOS boundary, hooking interrupt 21. Total system and available free memory, as indicated by the DOS CHKDSK program, will have decreased by 512 bytes. Interrupt 12's return will not have been moved. Once the Tu-482 virus is memory resident, it will infect .COM programs larger than approximately 8K in size when they are executed. Infected programs will have a file length increase of 482 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 in Tu-482 infected programs. It is unknown if Tu-482 does anything besides replicate.