Polish-45 Virus

 Virus Name:  Polish-45 
 Aliases:     P-45 
 V Status:    Viron 
 Discovered:  November, 1991 
 Symptoms:    .COM programs overwritten; file date/time changes 
 Origin:      Poland 
 Eff Length:  45 Bytes 
 Type Code:   ONCK - Overwriting Non-Resident .COM Infector 
 Detection Method:  Sweep, ViruScan, AVTK, F-Prot, PCScan, 
                    NAV, IBMAV, NAVDX, VAlert, ChAV, 
                    NShld, LProt, Sweep/N, Innoc, NProt, AVTK/N, 
                    NAV/N, IBMAV/N 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Polish-45 virus was submitted in November, 1991.  This virus is 
       a non-resident, direct action overwriting virus which corrupts the 
       .COM programs it infectes. 
       When a program infected with Polish-45 is executed, the virus will 
       infect all .COM programs located in the current directory by over- 
       writing the first 45 bytes of the program with a copy of the virus. 
       Since the first 45 bytes are overwritten, the programs will be 
       permanently damaged and will no function properly.  There will only 
       be a file length increase if the .COM file was originally smaller 
       than 45 bytes.  In this case, the file length will become 45 bytes. 
       Infected files will have had their date and time in the DOS disk 
       directory updated to the current system date and time when infection 
       Programs infected with Polish-45 should be deleted and replaced with 
       clean copies.  It is not possible to disinfect these programs as the 
       first 45 bytes of the original program have been lost. 

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