DOS-1 Virus

Virus Name: DOS-1 Aliases: V Status: Rare Discovered: October, 1993 Symptoms: .COM file growth; file date/time changes Origin: Unknown Eff Length: 184 Bytes Type Code: PNCK - Parasitic Non-Resident .COM Infector Detection Method: ViruScan, IBMAV, F-Prot, AVTK, NAV, Sweep, NAVDX, VAlert, PCScan, ChAV, NProt, NShld, AVTK/N, NAV/N, Sweep/N, IBMAV/N, Innoc, LProt Removal Instructions: Delete infected files General Comments: The DOS-1 virus was submitted in October, 1993. Its origin or point of isolation is unknown. DOS-1 is a non-resident, direct action infector of .COM programs, including COMMAND.COM. When a program infected with the DOS-1 virus is executed, the DOS-1 virus will infect all of the .COM programs located in the current directory. Infected programs will have a file length increase of 184 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. The following text strings are visible within the viral code in all DOS-1 infected programs: "DOS-1" "MK????????COM" DOS-1 doesn't appear to do anything besides replicate.