Repent Virus

 Virus Name:  Repent 
 V Status:    Viron 
 Discovery:   December, 1992 
 Symptoms:    .COM files overwritten; program corruption; 
              programs fail to function properly; boot failures 
 Origin:      Unknown 
 Eff Length:  350 Bytes OW 
 Type Code:   ONCK - Overwriting Non-Resident .COM Infector 
 Detection Method:  ViruScan, Sweep, F-Prot, NAV, IBMAV, AVTK, 
                    NAVDX, VAlert, PCScan, ChAV, 
                    NShld, Sweep/N, Innoc, LProt, NAV/N, AVTK/N, IBMAV/N, 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Repent virus was submitted in December, 1992.  Its origin or 
       point of isolation is unknown.  Repent is a non-resident overwriting 
       virus which infects .COM programs, including COMMAND.COM. 
       When a program infected with the Repent virus is executed, the 
       Repent virus will infect the first four .COM programs located in 
       the current directory.  If COMMAND.COM is located in this directory, 
       it may become infected.  The Repent virus contains code to move 
       up one directory in the directory structure, though this code does 
       not function properly and programs in higher level directories are 
       not infected by the virus. 
       Programs infected with the Repent virus will have the first 350 
       bytes of the host program overwritten by the Repent viral code. 
       There will be no change to the file's length unless it was 
       originally smaller than 350 bytes in length, in which case it will 
       become 350 bytes in length.  The program's date and time in the DOS 
       disk directory listing will not be altered.  One text string is 
       encrypted within the Repent viral code: 
               "*.COM .." 
       Programs infected with the Repent virus will not function properly, 
       and are permanently corrupted.  Boot failures will occur once the 
       boot copy of COMMAND.COM becomes infected by the virus. 

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