Fungus Virus

 Virus Name:  Fungus 
 Aliases:     X-Fungus 
 V Status:    Rare 
 Discovered:  May, 1992 
 Symptoms:    .COM & .EXE growth; file allocation errors; decrease in total 
              system and available free memory 
 Origin:      Australia 
 Eff Length:  1,422 Bytes 
 Type Code:   PRhAK - Parasitic Resident .COM & .EXE Infector 
 Detection Method:  ViruScan, AVTK, F-Prot, Sweep, IBMAV, 
                    NAV, NAVDX, VAlert, PCScan, ChAV, 
                    NShld, Sweep/N, Innoc, NProt, AVTK/N, NAV/N, IBMAV/N, 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Fungus virus was discovered in Australia in May, 1992.  It is 
       a memory resident infector of .COM and .EXE programs, including 
       COMMAND.COM, and employs some stealth techniques. 
       When the first Fungus infected program is executed, the Fungus 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 08 and 21 will be hooked by the virus. 
       Interrupt 12's return will not have been moved.  Also at this time, 
       the virus will infect COMMAND.COM, if it was not previously 
       After the Fungus virus has become memory resident, it will 
       intermittently infect .COM and .EXE programs when they are opened 
       or executed.  Infected programs will have a file length increase 
       of 1,422 bytes, though the file length increase will not be visible 
       if the virus is memory resident.  The virus' code will be located at 
       the end of the file.  The program's date and time in the DOS disk 
       directory listing will not have been altered. 
       Several text strings can be found within the viral code in Fungus 
       infected programs: 
               "*X-Fungus by Harry McBungus*" 
               "*Greets SCP*" 
               "*Greets RABID*" 
               "* Patricia: Grow some programming knowledge *" 
               "*Grease me!*" 
               "*Epileptic Downer*" 
       Besides the decrease in total system and available free memory, 
       systems infected with the Fungus virus will also experience file 
       allocation errors on infected files when the DOS CHKDSK program 
       is executed with the virus memory resident. 

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