914 Virus

 Virus Name:  914 
 Aliases:     Russian Mutant 
 V Status:    Rare 
 Discovery:   February, 1992 
 Symptoms:    .COM file growth; decrease in total system & available free 
 Origin:      Unknown 
 Eff Length:  914 Bytes 
 Type Code:   PRhC - Parasitic Resident COM Infector 
 Detection Method:  AVTK, ViruScan, F-Prot, NAV, ChAV, 
                    Sweep, IBMAV, NAVDX, VAlert, PCScan, 
                    NShld, LProt, Sweep/N, Innoc, NProt, AVTK/N, 
                    NAV/N, IBMAV/N 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The 914 virus was received in February, 1992.  Its origin or point 
       of isolation is unknown.  The 914 virus is a memory resident 
       infector of .COM programs.  It does not infect COMMAND.COM. 
       The first time a program infected with the 914 virus is executed, 
       this virus will install itself memory resident at the top of system 
       memory but below the 640K DOS boundary.  Interrupt 12's return will 
       not have been moved.  Total system and available free memory, as 
       indicated by the DOS CHKDSK program, will have decreased by 912 
       bytes.  Interrupts 1C and AC will be hooked by the virus in memory. 
       Once the 914 virus is memory resident, it will infect .COM programs 
       larger than approximately 1K in size when they are executed. 
       Infected programs will have a file length increase of 914 bytes, 
       the virus will be located at the end of the file.  The program's 
       date and time in the DOS disk directory listing will not have been 
       altered.  There are no text strings visible in the viral code in 
       infected files. 
       It is unknown if 914 does anything besides replicate. 

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