Julia-1000 Virus

Virus Name: Julia-1000 Aliases: V Status: Rare Discovered: November, 1993 Symptoms: .COM & .EXE growth; system hangs; decrease in total system & available free memory Origin: Unknown Eff Length: 1,000 Bytes Type Code: PRhAK - Parasitic Resident .COM & .EXE Infector Detection Method: F-Prot, ViruScan, Sweep, AVTK, IBMAV, NAVDX, VAlert, NAV, PCScan, ChAV, Sweep/N, NShld, AVTK/N, NProt, Innoc, IBMAV/N, NAV/N Removal Instructions: Delete infected files General Comments: The Julia-1000 virus was received in November, 1993. Its origin or point of isolation is unknown. Julia-1000 is a memory resident infector of .COM and .EXE programs, including COMMAND.COM. When the first Julia-1000 infected program is executed, this virus will install itself memory resident at the top of system memory but below the 640K DOS boundary, not moving interrupt 12's return. Total system and available free memory, as indicated by the DOS CHKDSK program, will have decreased by 2,080 bytes. Interrupt 21 will be hooked by the virus in memory. Once Julia-1000 is memory resident, it will infect .COM and .EXE programs when they are executed. Infected programs will have a file length increase of 1,000 bytes. In the case of .COM programs, the virus will be located at the beginning of the file, while for .EXE programs, the virus will be 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 encrypted within the Julia-1000 viral code: "Julia L." "Today is May Day ! Ver 3" System hangs may occur when Julia-1000 infected programs are executed. Known variant(s) of Julia-1000 are: Julia-1027: Received in November, 1993, Julia-1027 is a 1,027 byte variant of the Julia-1000 virus described above. Origin: Unknown November, 1993.