Massacre Virus

Virus Name: Massacre Aliases: Massacre.775 V Status: New Discovered: July, 1996 Symptoms: .COM & .EXE growth; interrupts 21 & 2F hooked in available free memory Origin: Unknown Eff Length: 775 Bytes Type Code: PRfA - Parasitic Resident .COM & EXE Infector Detection Method: F-Prot, AVTK, IBMAV, ViruScan, NAV, NAVDX, ChAV, Innoc, AVTK/N, IBMAV/N, NShld, NAV/N Removal Instructions: Delete infected files General Comments: The Massacre virus was received in July, 1996. Its origin or point of isolation is unknown. Massacre is a memory resident infector of .COM and .EXE files, but not COMMAND.COM. When a program infected with the Massacre virus is executed, this virus will install itself memory resident in available free memory, hooking interrupts 21 and 2F. Total system and available free memory, as indicated by the DOS CHKDSK program from DOS 5.0, will not be altered. Once the Massacre virus is memory resident, it will infect .COM and .EXE files, but not COMMAND.COM, when they are executed or opened, but not when copied. Infected files will have a file length increase of 775 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 viral code: "[MIDNIGHT MASSACRE] V1.2 by Crypt Keeper" "EXECOM" It is unknown what this virus may do besides replicate. See: Keeper