PV-81 Virus

 Virus Name:  PV-81   
 V Status:    Rare 
 Discovery:   March, 1993 
 Symptoms:    .COM file growth; file date/time changes; system hangs 
 Origin:      Unknown 
 Eff Length:  81 Bytes 
 Type Code:   PNCK - Parasitic Non-Resident .COM Infector 
 Detection Method:  Sweep, F-Prot, ViruScan, IBMAV, AVTK, 
                    NAV, NAVDX, VAlert, ChAV, 
                    Sweep/N, Innoc, NShld, NProt, AVTK/N, IBMAV/N, NAV/N 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The PV-81 virus was submitted in March, 1993.  Its origin or point 
       of isolation.  PV-81 is a primitive, non-resident direct action 
       infector of .COM programs, including COMMAND.COM. 
       When a program infected with the PV-81 virus is executed, the PV-81 
       virus will infect one or several of the .COM programs located in 
       the current directory.  Infected programs will have a file length 
       increase of 81 bytes with the virus being located at the beginning 
       of the file.  Unfortunately, PV-81 cannot determine properly if it 
       has previously infected a file, so it will reinfect them, adding an 
       additional 81 bytes with each reinfection.  After reinfection has 
       occurred, viral code will be located at both the beginning and the 
       end of the file.  The program's date and time in the DOS disk 
       directory listing will have been updated to the current system date 
       and time when the last infection occurred.  One text string is 
       visible within the viral code in infected files: 
       System hangs may occur when infected programs are executed.  Other- 
       wise, the virus doesn't do anything besides replicate. 

Show viruses from discovered during that infect .

Main Page