V-1n Virus

 Virus Name:  V-1n 
 Aliases:     V-10, V-11 
 V Status:    Viron 
 Discovered:  May, 1992 
 Symptoms:    .COM files overwritten; program corruption; file date/time 
 Origin:      Unknown 
 Eff Length:  113 or 624 Bytes (Overwriting) 
 Type Code:   ONCK - Overwriting Non-Resident .COM Infector 
 Detection Method:  ViruScan, NAV, NAVDX, AVTK 7.68+, 
                    NShld, NAV/N, AVTK/N 7.68+ 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The V-1n group of viruses was received in May, 1992.  This 
       group's origin is unknown.  The viruses in this entry are earlier 
       versions of the viruses described in the  V-3n  entry.  Unlike the 
       viruses described in the V-3n entry, the viruses described here 
       are overwriting viruses.  The earliest of the viruses, V-10, 
       is described in this entry, with the other member of the group 
       described below.  Both of the viruses in this entry infect .COM 
       files, including COMMAND.COM. 
       When a program infected with the V-10 virus is executed, this 
       virus will infect the third .COM file located in the current 
       directory, overwriting the first 624 bytes of the program.  The 
       user will then be returned to the DOS prompt. 
       Besides having the first 624 bytes of the host program overwritten 
       with the viral code of the V-10 virus, infected programs will also 
       have their date and time in the DOS disk directory listing updated 
       to the system date and time when infection occurred.  If the host 
       program was originally smaller than 628 bytes, it will become 
       628 bytes in length.  Programs larger than 628 bytes in length will 
       have no file length increase.  The following text strings can be 
       found within V-10 infected programs: 
               "V - Version 1.0" 
       V-10 doesn't do anything besides replicate, destroying the host 
       programs it infects. 
       Other Member(s) of the V-1n group of viruses are: 
       V-11: A later version of the V-10 virus described above, this 
             virus overwrites the first 113 bytes of the .COM programs it 
             infects.  The text strings within the virus have been changed 
             "V - Version 1.1". 
             Origin:  Unknown  May, 1992. 
       See:   V-3n 

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