Burghofer Virus

 Virus Name:  Burghofer 
 V Status:    Rare 
 Discovery:   June, 1991 
 Symptoms:    .COM file growth; decrease in total system and available 
 Origin:      Switzerland 
 Eff Length:  525 Bytes 
 Type Code:   PRhCK - Parasitic Resident .COM Infector 
 Detection Method:  ViruScan, AVTK, Sweep, F-Prot, ChAV, 
                    NAV, IBMAV, NAVDX, VAlert, PCScan, 
                    NShld, LProt, Sweep/N, Innoc, NProt, AVTK/N, 
                    NAV/N, IBMAV/N 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Burghofer virus was isolated in June, 1991, in Switzerland. 
       Burghofer is a memory resident infector of .COM programs, including 
       When the first Burghofer infected program is executed, Burghofer 
       will install itself memory resident at the top of system memory 
       but below the 640K DOS boundary.  Total system and available memory, 
       as measured by the DOS CHKDSK program, will decrease by 528 bytes. 
       Interrupt 21 will be hooked by the virus. 
       Once Burghofer is memory resident, it will infect .COM programs 
       when they are executed.  If COMMAND.COM is executed, it will be 
       infected.  Infected .COM programs increase in file size by 525 
       bytes, the virus will be located at the end of the infected file. 
       The file's date and time in the disk directory will not be 
       Programs infected with Burghofer will contain the text string 
       "GS/02" at the fourth thru eighth bytes of the file. 
       Burghofer doesn't do anything besides replicate. 

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