Not-586 Virus

 Virus Name:  Not-586 
 V Status:    Rare 
 Discovered:  February, 1993 
 Symptoms:    .COM file growth; decrease in total system & available free 
 Origin:      USSR 
 Eff Length:  586 Bytes 
 Type Code:   PRtCK - Parasitic Resident .COM Infector 
 Detection Method:  Sweep, AVTK, F-Prot, ViruScan, IBMAV, 
                    NAV, NAVDX, VAlert, PCScan, ChAV, 
                    Sweep/N, NShld, NProt, AVTK/N, NAV/N, IBMAV/N, Innoc, 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Not-586 virus was submitted in February, 1993, and is originally 
       from the USSR.  Not-586 is a memory resident infector of .COM files, 
       including COMMAND.COM. 
       When the first Not-586 infected program is executed, this virus will 
       install itself memory resident at the top of system memory but below 
       the 640K DOS boundary, moving interrupt 12's return.  Total system 
       and available free memory, as indicated by the DOS CHKDSK program, 
       will have decreased by 1,024 bytes.  Interrupt 21 will be hooked by 
       the virus in memory. 
       Once memory resident, the Not-586 virus will infect .COM programs, 
       including COMMAND.COM, when they are executed.  Infected programs 
       will have a file length increase of 586 bytes with the virus being 
       located at the end of the file.  The program's date and time in the 
       DOS disk directory listing will not be altered.  No text strings are 
       visible within the viral code in Not-586 infected programs. 
       It is unknown what Not-586 may do besides replicate. 

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