Jerusalem 1663 Virus

Virus Name: Jerusalem 1663 Aliases: V Status: Rare Discovered: October, 1992 Symptoms: .COM & .EXE growth; TSR Origin: Unknown Eff Length: 1,663 Bytes Type Code: PRsAK - Parasitic Resident .COM & .EXE Infector Detection Method: ViruScan, AVTK, Sweep, F-Prot, IBMAV, NAV, NAVDX, VAlert, PCScan, ChAV, NShld, Sweep/N, Innoc, NProt, AVTK/N, LProt, IBMAV/N, NAV/N Removal Instructions: Delete infected files General Comments: The Jerusalem 1663 virus was received in October, 1992. Its origin or point of isolation is unknown. Jerusalem 1663 is a memory resident infector of .COM and .EXE programs, including COMMAND.COM. The first time a program infected with the Jerusalem 1663 virus is executed, the Jersalem 1663 virus will install itself memory resident as a low system memory TSR of 2,432 bytes. Interrupts 13 and 21 will be hooked. Once memory resident, Jersalem 1663 will infect programs, including COMMAND.COM, when they are executed. Both .COM and .EXE programs will increase in size by 1,663 bytes with the virus being located at the end of the file. The virus cannot recognize a previous infection on a file. Both .COM and .EXE programs may become reinfected, adding 1,663 bytes with each reinfection. The file's date and time in the DOS disk directory listing will not be altered. No text strings are visible within the viral code. It is unknown what Jerusalem 1663 does besides replicate. See: Jerusalem