Coyote Virus

 Virus Name:  Coyote 
 V Status:    New 
 Discovery:   December, 1994 
 Symptoms:    .EXE file growth; 
              decrease in total system & available free memory 
 Origin:      Unknown 
 Eff Length:  1,103 - 1,117 Bytes 
 Type Code:   PRhE - Parasitic Resident .EXE Infector 
 Detection Method:  ViruScan, NAV, NAVDX, IBMAV, F-Prot 2.22+, 
                    PCScan, AVTK 7.60+, ChAV, 
                    NProt, NShld, NAV/N, IBMAV/N, LProt, AVTK/N 7.60+, 
                    Innoc 4.0+ 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Coyote virus was received in December, 1994.  Its origin or 
       point of isolation is unknown.  Coyote is a memory resident infector 
       of .EXE files. 
       When the first Coyote infected program is executed, this virus will 
       install itself memory resident at the top of system memory but below 
       the 640K DOS boundary.  Total system and available free memory, as 
       indicated by the DOS CHKDSK program, will have decreased by 2,048 
       bytes.  Interrupts 14, 17 and 21 will be hooked by the virus in 
       Once the Coyote virus is memory resident, it will infect .EXE files 
       when they are executed.  Infected programs will have a file length 
       increase of 1,103 to 1,117 bytes with the virus being located at the 
       end of the file.  The program's date and time in the DOS disk 
       directory listing will not be altered.  The following text strings 
       are visible within the viral code in all Coyote infected files: 
               "Ipan in xiktli meztli" 
       It is unknown what Coyote does besides replicate. 

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