Quiet Virus

 Virus Name:  Quiet 
 V Status:    Rare 
 Discovery:   January, 1992 
 Symptoms:    .COM file growth; TSR 
 Origin:      Kansas, United States 
 Eff Length:  2,048 - 2,063 Bytes 
 Type Code:   PRsC - Parasitic Resident .COM Infector 
 Detection Method:  ViruScan, F-Prot, Sweep, IBMAV, NAVDX, 
                    AVTK, NAV, VAlert, PCScan, ChAV, 
                    NShld, LProt, Sweep/N, Innoc, NProt, AVTK/N, 
                    NAV/N, IBMAV/N 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Quiet virus was discovered in the State of Kansas in the 
       United States in January, 1992.  Quiet is a memory resident infector 
       of .COM programs, but not COMMAND.COM.  It's point of discovery 
       was in a computer repair facility, so it is believed to be in the 
       public domain. 
       When the first Quiet infected program is executed, the Quiet virus 
       will install itself memory resident as a low system memory TSR of 
       2,304 bytes.  The virus will have hooked interrupts 16, 21, and 64. 
       Once the Quiet virus is memory resident, it will infect .COM 
       programs other than COMMAND.COM when they are executed.  Quiet 
       infected programs will have a file length increase of 2,048 to 
       2,063 bytes with the virus being located at the end of the infected 
       program.  The file's date and time in the DOS disk directory listing 
       will not have been altered.  The following text strings can be 
       found in the last 2K of Quiet infected programs: 
               "COM COM" 
               "t=1024 /write=off /win /quiet" 
       It is unknown what the Quiet virus does besides replicate. 

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