Silence Virus

 Virus Name:  Silence 
 V Status:    Rare 
 Discovered:  July, 1992 
 Symptoms:    .COM file growth; decrease in total system & available free 
 Origin:      Unknown 
 Eff Length:  555 Bytes 
 Type Code:   PRhCK - Non-Resident Parasitic .COM Infector 
 Detection Method:  ViruScan, F-Prot, IBMAV, AVTK, NAVDX, 
                    Sweep, NAV, VAlert, PCScan, ChAV, 
                    NShld, LProt, Sweep/N, Innoc, NProt, AVTK/N, IBMAV/N, 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Silence virus was received in July, 1992.  Silence is a memory 
       resident infector of .COM programs, including COMMAND.COM.  Its 
       origin or point of isolation is unknown. 
       The first time a program infected with the Silence virus is executed, 
       the Silence virus will install itself memory resident at the top 
       of system memory but below the 640K DOS boundary.  It does not move 
       interrupt 12's return.  Total system and available free memory, as 
       indicated by the DOS CHKDSK program, will have decreased by 1,568 
       bytes.  Interrupt 21 will be hooked by Silence in memory. 
       Once the Silence virus is memory resident, it will infect .COM 
       programs when they are executed.  If COMMAND.COM is executed, it will 
       be infected by the virus.  Programs infected with the Silence virus 
       will have a file length increase of 555 bytes with the virus being 
       located at the beginning of the file.  The program's date and time 
       in the DOS disk directory listing will not be altered.  The following 
       text is encrypted within the virus: 
               "The Silence Of The Lambs!" 
       Silence doesn't appear to do anything besides replicate. 
       See:   Youth 

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