Jump Virus

Virus Name: Jump Aliases: Jump.466 V Status: New Discovered: October, 1994 Symptoms: .COM file growth; file date/time changes; decrease in total system & available free memory Origin: Unknown Eff Length: 466 Bytes Type Code: PRhC - Parasitic Resident .COM Infector Detection Method: AVTK, ViruScan, IBMAV, Sweep, F-Prot, NAV, NAVDX, PCScan, ChAV, Sweep/N, IBMAV/N, NShld, AVTK/N, NAV/N, Innoc 4.0+ Removal Instructions: Delete infected files General Comments: The Jump or Jump.466 virus was received in October, 1994. Its origin or point of isolation is unknown. Jump is a memory resident infector of .COM files, though it does not infect all .COM files. When the first Jump 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 768 bytes. Interrupt 21 will be hooked by the virus in memory. Once the Jump virus is memory resident, it may infect .COM files when they are executed. Infected programs will have a file length increase of 466 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. The following text string is visible within the viral code in all infected programs: "JUMP"