DST Family
Description DST Family
These are harmless memory resident parasitic viruses. They hook INT 21h and write themselves to the end of COM files that are executed. They do not manifest themselves in any way.
"DST.231,242" store the original INT 21h address to the address of INT 4Bh, and use INT 4Bh call while infecting the files.
"DST.330,347,396" have a bug and may halt the system while installing memory resident. These viruses contain the text:
DST
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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.
MGUL.925
Description MGUL.925
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 8 and sometimes reboots the computer.
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