Fumble Family
Description Fumble Family
These are dangerous parasitic viruses which hit by standard way .COM-files of current directory. The viruses are not memory resident but create a memory resident program which hooks INT 17h and exchanges the symbols that are output to printer. The texts "V1" and "*.COM" are present at the virus beginning.
Fumble.867
After execution of an infected file it leaves a small memory-resident program in the memory. This routine substitutes some characters typed in from the keyboard. When infected files are run the virus hooks INT 16h, 20h, 21h.
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MGUL.1953
Description MGUL.1953
This is a dangerous memory resident parasitic stealth virus. It hooks INT 21h and writes itself to the end of COM and EXE files that are accessed.
It also hooks INT 1, 3, 8. On June 11th and November 30th, it erases the hard drive MBR. It reboots the computer if the virus is under a debugger. It contains the following string:
MGUL. v2.5
MGUL.1962
Description MGUL.1962
This is a dangerous memory resident parasitic stealth virus. It hooks INT 21h and writes itself to the end of COM and EXE files that are accessed.
It also hooks INT 1, 3, 8. On June 11th and November 30th, it erases the hard drive MBR. It reboots the computer if the virus is under a debugger.
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