Deaf Virus

 Virus Name:  Deaf 
 Aliases:     Deaf.1119, Stealth.1119 
 V Status:    New 
 Discovered:  February, 1995 
 Symptoms:    .COM & .EXE growth; file date/time year changed; 
              decrease in total system & available free memory; 
              DOS CHKDSK file allocation errors 
 Origin:      Unknown 
 Eff Length:  1,119 Bytes 
 Type Code:   PRtAK - Parasitic Resident .COM & .EXE Infector 
 Detection Method:  F-Prot, ViruScan, AVTK, Sweep, IBMAV, VAlert, 
                    NAV, NAVDX, PCScan, ChAV, 
                    Sweep/N, AVTK/N, NShld, IBMAV/N, NAV/N, NProt, Innoc 4.0+ 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Deaf or Deaf.1119 virus was received in February, 1995.  Its 
       origin or point of isolation is unknown.  Deaf is a memory resident 
       stealth virus which infects .COM and .EXE files, including 
       When the first Deaf 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 7,168 bytes.  Interrupts 21 and 24 will be 
       hooked by the virus in memory. 
       Once this virus is memory resident, it will infect .COM and .EXE 
       files, including COMMAND.COM, when they are executed.  Infected 
       files will have a file length increase of 1,119 bytes with the virus 
       being located at the end of the file.  This file length increase, 
       however, is hidden by the virus when it is memory resident.  The 
       file's date and time in the DOS disk directory listing will have the 
       file date year altered so that it has a value between 20 and 39.  No 
       text strings are visible within the viral code. 
       The DOS CHKDSK program, when executed with the virus memory resident, 
       will indicate file allocation errors on infected files. 

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