V351 Virus

 Virus Name:  V351 
 Aliases:     V-351    
 V Status:    New 
 Discovered:  August, 1993 
 Symptoms:    .COM file growth; programs fail to function properly; 
              decrease in total system & available free memory 
 Origin:      Unknown 
 Eff Length:  351 Bytes 
 Type Code:   PRhCK - Parasitic Resident .COM Infector 
 Detection Method:  ViruScan, Sweep, F-Prot, IBMAV, NAVDX, VAlert, 
                    NAV, AVTK, ChAV, 
                    NShld, Sweep/N, IBMAV/N, NProt, NAV/N, AVTK/N, Innoc 4.0+ 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The V351, or V-351, virus was received in August, 1993.  Its origin 
       or point of isolation is unknown.  V351 is a memory resident 
       infector of .COM programs, including COMMAND.COM. 
       When the first V351 infected program is executed, the V351 virus 
       will install itself memory resident at the top of system memory but 
       below the 640K DOS boundary, hooking interrupt 21 at approximately 
       address 7D00.  Interrupt 12's return will not have been moved. 
       Once the V351 virus is memory resident, it will infect .COM programs 
       when they are executed.  Infected programs will have a file length 
       increase of 351 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 not be altered.  One text string is visible within the 
       viral code in V351 infected programs: 
       Once the V351 virus is memory resident, programs will fail to 
       function properly when they are executed. 

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