Mannequin Virus

Virus Name: Mannequin Aliases: V Status: Rare Discovered: January, 1992 Symptoms: .COM & .EXE growth; decrease in total system & available free memory; interference with printing Origin: Unknown Eff Length: 778 Bytes Type Code: PRhA - Parasitic Resident .COM & .EXE Infector Detection Method: ViruScan, F-Prot, Sweep, AVTK, ChAV, IBMAV, NAV, NAVDX, VAlert, PCScan, NShld, LProt, Sweep/N, Innoc, NProt, AVTK/N, NAV/N, IBMAV/N Removal Instructions: Delete infected files General Comments: The Mannequin virus was received in January, 1992. Its origin or point of original isolation is unknown. Mannequin is a memory resident infector of .COM and .EXE files. It does not infect COMMAND.COM. The first time a program infected with Mannequin is executed, the Mannequin virus will install itself memory resident at the top of system memory but below the 640K DOS boundary. Total system and available free memory, as indicated by the DOS CHKDSK program, will have decreased by 848 bytes. Interrupt 12's return will not have been moved. Interrupts 17 and 21 will be hooked by the Mannequin virus in memory. Once the Mannequin virus is memory resident, it will infect .COM and .EXE programs when they are executed. Infected programs will have a file length increase of 778 bytes with the virus being located at the end of the infected file. The file's date and time in a DOS disk directory listing will not have been altered. Two text strings can be found within the viral code in Mannequin infected files: "RQSP2" "COMMAND.COM" Systems infected with Mannequin may experience difficults or interference when attempting to print to the system printer.