Davis Virus

 Virus Name:  Davis 
 V Status:    Rare 
 Discovered:  May, 1992 
 Symptoms:    .EXE file growth; beeping & message display; decrease in 
              total system & available free memory 
 Origin:      Malaysia 
 Eff Length:  1,776 - 1,965 Bytes 
 Type Code:   PRhE - Parasitic Resident .EXE Infector 
 Detection Method:  ViruScan, Sweep, AVTK, F-Prot, IBMAV, NAV, NAVDX, 
                    VAlert, PCScan, ChAV, 
                    NShld, LProt, Sweep/N, AVTK/N, NProt, IBMAV/N, Innoc, 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Davis virus was received from Malaysia in May, 1992.  Davis is 
       a memory resident infector of .EXE programs which will display a 
       message after it has been memory resident for 15 to 30 minutes. 
       The first time a program infected with the Davis virus is executed, 
       the Davis 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 1,776 
       bytes.  Interrupts 08 and 21 will be hooked by the Davis virus in 
       Once Davis is memory resident, it will infect .EXE programs when 
       they are executed.  Infected programs will have a file length 
       increase of 1,776 to 1,965 bytes with the virus being located at 
       the end of the infected file.  The program's date and time in the 
       DOS disk directory listing will not be altered. 
       Approximately 15 to 30 minutes after the Davis virus has become 
       memory resident, it will start displaying the following message 
       accompanied by 3 beeps every few minutes: 
                               DAVIS       V1.01  
                          Author      : Davis     
                          Date        : mm/dd/yy  
                          VIRUS STATION COPY      
                Hi ! How are you today ?  Don't worry about ! 
                DAVIS VIRUS will follow you forever and ever ! 
            Don't care me!  I really do not damage your disk or data. 
            But..........................make Funny to you sometime." 
       Davis does not do anything malicious other than displaying its 
       disruptive message. 

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