889 Virus

 Virus Name:  889 
 V Status:    Rare 
 Discovery:   March, 1993 
 Symptoms:    .COM & .EXE growth; file date/time changes; 
              decrease in total system & available free memory 
 Origin:      Unknown 
 Eff Length:  889 - 903 Bytes 
 Type Code:   PRhA - Parasitic Resident .COM & .EXE Infector 
 Detection Method:  AVTK, F-Prot, Sweep, ViruScan, IBMAV, VAlert, 
                    NAV, NAVDX, PCScan, ChAV, 
                    Sweep/N, NShld, NProt, AVTK/N, IBMAV/N, Innoc, NAV/N 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The 889 virus was submitted in March, 1993.  Its origin or point of 
       isolation is unknown.  889 is a memory resident infector of .COM and 
       .EXE programs, but not COMMAND.COM. 
       When the first 889 infected program is executed, the 889 virus will 
       install itself memory resident at the top of system memory but below 
       the 640K DOS boundary, hooking interrupt 21.  Total system and 
       available free memory, as indicated by the DOS CHKDSK program, will 
       have decreased by 960 bytes.  Interrupt 12's return will not be 
       Once the 889 virus is memory resident, it will infect .COM and .EXE 
       programs, but not COMMAND.COM, when they are executed.  Infected 
       .COM programs will have a file length increase of 889 bytes with the 
       virus being located at the end of the file.  Infected .EXE programs 
       will increase in size by 889 to 903 bytes with the virus at the end 
       of the file.  The infected program's date and time in the DOS disk 
       directory listing will have been updated to the current system date 
       and time when infection occurred.  No text strings are visible within 
       the viral code in infected programs. 
       It is unknown what the 889 virus may do besides replicate. 

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