Stone`90 Virus

 Virus Name:  Stone`90 
 Aliases:     Polish 961, Stone-90 
 V Status:    Rare 
 Discovered:  December, 1990 
 Symptoms:    .COM file growth 
 Origin:      Poland 
 Eff Length:  961 Bytes 
 Type Code:   PNCK - Parasitic Non-Resident .COM Infector 
 Detection Method:  ViruScan, AVTK, F-Prot, Sweep, 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 Stone`90 virus, or Polish 961, is a non-resident direct action 
       infector of .COM programs, including COMMAND.COM.  It was submitted 
       in December, 1990, and is from Poland. 
       When a program infected with the Stone`90 virus is executed, the 
       virus will look for one .COM program on the current drive and in 
       the current directory to infect.  If one is found, the virus will 
       infected it. The newly infected .COM program will increase in 
       length by 961 bytes, and have the virus's code located at the end 
       of the program. 
       The following text strings can be found in infected files: 
               "Sorry, I`m INFECTED!" 
               "I`m already NOT infected!" 
               "(C) Stone`90" 
       Stone`90 does not appear to do anything besides replicate. 

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