hllp.mutan
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HLLP.Mutant
It is a dangerous memory resident parasitic virus, it writes itself to the beginning of DOS EXE files. When and infected file is run, the virus installs itself into the DOS memory and hooks INT 9, 13h, 1Ch, 28h. On INT 28h calls (DOS idle) the virus looks for EXE-files in the current directory and infect them. The infection routine is also activated depending on the timer ticks (INT 1Ch).
Because of a bug the virus corrupts files that have size less than 7489 bytes. While infecting the virus adds the "A_FOREVER" string to the end of the file. The virus also contains the text string:
POPUP *.exe MUTANT.EXE COMMAND.COM
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