621 Virus

 Virus Name:  621 
 Aliases:     Something 
 V Status:    Rare 
 Discovery:   November, 1991 
 Symptoms:    .COM file growth 
 Origin:      Unknown 
 Eff Length:  621 Bytes 
 Type Code:   PNCK - Parasitic Non-Resident COM Infector 
 Detection Method:  ViruScan, AVTK, Sweep, F-Prot, NAV, IBMAV, 
                    NAVDX, VAlert, PCScan, ChAV, 
                    NShld, LProt, Sweep/N, Innoc, NProt, AVTK/N, NAV/N, 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The 621 virus was received in November, 1991.  Its origin and point 
       of original isolation are unknown.  621 is a non-resident, direct 
       action infector of .COM files, including COMMAND.COM. 
       When a program infected with 621 is executed, the virus will search 
       the current drive and directory for an uninfected .COM program to 
       infect.  When the first uninfected program is located, it will be 
       infected by the 621 virus.  Infected programs increase in size by 
       621 bytes with the virus being located at the end of the infected 
       file.  The following text strings will be found within the viral 
       code in infected programs: 
               "Water detected in math-co-processor" 
               "PARITY ERROR" 
               "System halted" 
               "Something wonderful has happened, your PC is alive..." 
       It is unknown what 621 does besides replicate. 

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