Boojum Virus

 Virus Name:  Boojum 
 V Status:    Rare 
 Discovery:   May, 1992 
 Symptoms:    .EXE file growth; decrease in total system & available free 
 Origin:      Unknown 
 Eff Length:  340 - 350 Bytes 
 Type Code:   PRhE - Parasitic Resident .EXE Infector 
 Detection Method:  ViruScan, Sweep, AVTK, F-Prot, ChAV, 
                    NAV, IBMAV, NAVDX, VAlert, PCScan, 
                    NShld, Sweep/N, Innoc, NProt, AVTK/N, NAV/N, IBMAV/N, 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Boojum virus was received in May, 1992.  Its origin or point of 
       isolation are unknown.  Boojum is a memory resident infector of 
       .EXE programs. 
       When the first program infected with the Boojum virus is executed, 
       the Boojum virus will install itself memory resident at the top of 
       system memory but below the 640K DOS boundary.  Interrupt 12's 
       return will not be moved.  Total system and available free memory, 
       as indicated by the DOS CHKDSK program, will have decreased by 
       368 bytes.  Interrupt 21 will be hooked by Boojum in memory. 
       Once the Boojum virus is memory resident, it will infect .EXE 
       programs when they are executed.  Infected programs will have a 
       file length increase of 340 to 350 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.  No 
       text strings are visible within the viral code in Boojum infected 
       Boojum doesn't do anything besides replicate. 

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