Jack Virus

 Virus Name:  Jack 
 Aliases:     Jack.416 
 V Status:    New 
 Discovery:   January, 1995 
 Symptoms:    .COM & .EXE growth 
 Origin:      Unknown 
 Eff Length:  416 Bytes 
 Type Code:   PNAK - Parasitic Non-Resident .COM & .EXE Infector 
 Detection Method:  F-Prot, AVTK, IBMAV, ViruScan, Sweep, NAV, 
                    NAVDX, VAlert, PCScan, ChAV, 
                    AVTK/N, IBMAV/N, NShld, Sweep/N, NProt, NAV/N, LProt, 
                    Innoc 4.0+ 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Jack or Jack.416 virus was received in January, 1995.  It origin 
       or point of isolation is unknown.  Jack is a non-resident, direct 
       action infector of .COM and .EXE files, including COMMAND.COM. 
       When a program infected with the Jack virus is executed, this virus 
       will infect all of the .COM or .EXE files located in the current 
       directory.  Infected programs will have a file length increase of 
       416 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.  No text strings are visible within the viral code in 
       infected programs. 
       It is unknown what the Jack virus may do besides replicate. 

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