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: 

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