Gad-Fly Family
Description Gad-Fly Family
These are dangerous memory resident parasitic viruses. They hook INT 21h and write themselves to the middle of the COMMAND.COM file when the system is executing or opening that file. The viruses contain the internal text strings:
"Gad-Fly.629": Gad-fly
"Gad-Fly.646": The Revenger
Gad-Fly.629
While installing into the system memory, or while opening *.CAL or *.PRG files, and depending on the system timer the virus hooks INT 10h and upper-cases the symbols that are displayed. The virus also may delete the *.CAL and *.PRG files.
Gad-Fly.646
Depending on its counter and the system timer that virus erases the disk sectors.
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NextGen.2304
Description NextGen.2304
It is a harmless memory resident parasitic stealth virus. It hooks INT 21h, 2Fh and writes itself to the end of EXE files that are accessed. It contains the text strings:
The NextGen Stealth Virus
IL USA, 6-93all(Revision)
Ng.695
Description Ng.695
These are harmless memory resident parasitic viruses. They hook INT 13h, 28h and on INT 28h calls search for COM files of the current directory and write themselves to the beginning of the file. They contain the encrypted text strings:
"Ng.695,706": New Generation v.2.1 (NG-2.1 Ukr) *.COM
"Ng.914": NG-2.2 Ukr *.COM
"Ng.1036": NG-2.3 Ukr
"Ng.695,706" also displays the message:
Bad command or file name
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