PCV Virus

 Virus Name:  PCV 
 Aliases:     PCVRSDS 
 V Status:    Rare 
 Discovered:  June, 1991 
 Symptoms:    TSR; .COM & .EXE growth; files may be deleted; file 
              allocation errors 
 Origin:      Italy 
 Eff Length:  1,904 Bytes 
 Type Code:   PRsA - Parasitic Resident .COM & .EXE Infector 
 Detection Method:  ViruScan, F-Prot, Sweep, AVTK, IBMAV, NAV, 
                    NAVDX, VAlert, PCScan, ChAV, 
                    NShld, LProt, Sweep/N, NProt, AVTK/N, NAV/N, 
                    IBMAV/N, Innoc 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The PCV virus was submitted in June, 1991 from Italy.  PCV is a 
       memory resident infector of .COM and .EXE programs.  It does not 
       infect COMMAND.COM. 
       The first time a program infected with PCV is executed, PCV will 
       install itself memory resident as a low system memory TSR of 1,904 
       bytes.  The virus will hook interrupt 21. 
       After PCV is memory resident, it will infect .COM and .EXE programs 
       as they are executed.  .COM programs will increase in size by 1,904 
       bytes with the virus being located at the beginning of the infected 
       file.  .EXE programs will increase in size by 1,910 to 1,918 bytes 
       with the virus being located at the end of infected files.  The 
       file length increase, however, will mostly be hidden by the virus 
       if it is memory resident.  The program's date and time in the disk 
       directory will not be altered. 
       Systems infected with PCV will notice that files disappear or are 
       deleted randomly from the current directory.  These files may be 
       programs, .BAT files, or data files.  Files may also disappear 
       when the user attempts to view them, such as with a file editor. 
       Programs which the user is attempting to execute may also be 
       deleted by the virus. 
       If the DOS CHKDSK program is executed with PCV memory resident, it 
       will indicate file allocation errors on infected programs. 

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