500 Virus

 Virus Name:  500 
 Aliases:     Int86 
 V Status:    Rare 
 Discovery:   July, 1992 
 Symptoms:    .COM file growth; program hangs 
 Origin:      Unknown 
 Eff Length:  500 Bytes 
 Type Code:   PRaCK - Parasitic Resident .COM Infector 
 Detection Method:  ViruScan, AVTK, Sweep, F-Prot, 
                    IBMAV, NAV, NAVDX, VAlert, PCScan, ChAV, 
                    NShld, Sweep/N, LProt, Innoc, NProt, IBMAV/N, 
                    AVTK/N, NAV/N 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The 500 virus was submitted in August, 1992.  This virus is a 
       memory resident infector of .COM programs, including COMMAND.COM. 
       When the first 500 infected program is executed, this virus will 
       install itself memory resident in available free system memory. 
       Since the virus does not reserve the memory it occupies, and doesn't 
       keep other programs from overwriting it in memory, infected systems 
       may experience frequent system hangs. 
       Once the 500 virus is memory resident, it will infect .COM programs, 
       including COMMAND.COM, when they are executed.  Infected programs 
       will have a file length increase of 500 bytes with the virus being 
       located at the beginning of the infected program.  The file's date 
       and time in the DOS disk directory listing will not be altered. 
       The 500 virus cannot determine when it has previously infected a 
       program, so reinfection of files may occur.  Each reinfection of a 
       program will result in an additional 500 bytes being added to the 

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