646 Virus

 Virus Name:  646 
 Aliases:     Vienna C, Vienna 646 
 V Status:    Rare 
 Discovery:   October, 1990 
 Symptoms:    COMMAND.COM & .COM growth 
 Origin:      Unknown 
 Eff Length:  646 Bytes 
 Type Code:   PNCK - Parasitic Non-Resident COM Infector 
 Detection Method:  ViruScan, NAV, AVTK, F-Prot, Sweep, IBMAV, 
                    NAVDX, VAlert, PCScan, ChAV, 
                    NShld, LProt, Sweep/N, Innoc, NProt, AVTK/N, 
                    NAV/N, IBMAV/N 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The 646 virus was discovered in October, 1990.  Its origin is 
       unknown.  This virus is a non-resident infector of .COM files, 
       including COMMAND.COM. 
       When a file infected with the 646 virus is executed, the virus will 
       infect one other .COM file in the current directory.  Infected files 
       will increase in size by 646 bytes, with the virus being located at 
       the end of the infected file. 
       Infected files can be easily identified as they will always end with 
       the hex string: "EAF0FFFFFF". 
       This virus appears to do nothing except replicate. 

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