Zoid Virus

 Virus Name:  Zoid 
 V Status:    Rare 
 Discovered:  November, 1992 
 Symptoms:    .EXE file growth; decrease in total system & available free 
 Origin:      Unknown 
 Eff Length:  1,751 - 1,773 Bytes 
 Type Code:   PRhE - Parasitic Resident .EXE Infector 
 Detection Method:  AVTK, F-Prot, ViruScan, Sweep, IBMAV, NAVDX, 
                    NAV, VAlert, PCScan, ChAV, 
                    NShld, Sweep/N, AVTK/N, NAV/N, IBMAV/N, Innoc 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Zoid virus was submitted in November, 1992.  Zoid is a memory 
       resident infector of .EXE programs. 
       When the first Zoid infected program is executed, the Zoid 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.  No interrupts will be mapped to the 
       Zoid virus in memory. 
       Once the Zoid virus is memory resident, it will infect .EXE programs 
       when they are executed twice in a row.  Infected programs will have 
       a file length increase of 1,751 to 1,773 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 
       string is visible within the viral code in all Zoid infected 
       It is unknown what Zoid does besides replicate. 

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