708 Virus

 Virus Name:  708 
 V Status:    Rare 
 Discovery:   August, 1993 
 Symptoms:    .COM file growth; TSR; file date/time changes; 
              .COM file corruption; system hangs 
 Origin:      Unknown 
 Eff Length:  708 Bytes 
 Type Code:   PRsCK - Parasitic Resident COM Infector 
 Detection Method:  ViruScan, F-Prot, AVTK, IBMAV, NAV, 
                    NAVDX, PCScan, ChAV, 
                    NShld, NProt, IBMAV/N, AVTK/N, NAV/N, LProt 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The 708 virus was submitted in August, 1993.  Its origin or 
       point of isolation is unknown.  708 is a memory resident direct 
       action infector of .COM programs, including COMMAND.COM. 
       The first time a program infected with the 708 virus is executed, 
       the 708 virus will install itself memory resident as a low system 
       memory TSR of 1,040 bytes.  Interrupt 08 will be hooked by the virus 
       in memory.  Also at this time, the virus will infect the copy of 
       COMMAND.COM located in the C: drive root directory if it was not 
       previously infected. 
       Once the 708 virus is memory resident, it will infect three .COM 
       programs located in the current directory when an infected program 
       is executed.  Infected programs will have a file length increase of 
       708 bytes with the virus being located at the end of the file. 
       The program's date and time in the DOS disk directory will have been 
       updated to the current system date and time when infection occurred. 
       The following text strings are encrypted within the 708 viral code: 
               "Bad command or file name" 
               "C:\COMMAND.COM C:\COMMAND .COM *.COM .." 
       The 708 virus will occassionally corrupt the programs it attempts 
       to infect.  These corrupted programs will have the first three bytes 
       altered, no file length increase will occur.  The file's date and 
       time in the DOS disk directory listing will not be altered. 
       Execution of one of these corrupted programs will result in a 
       system hang. 

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