WorkHard.1664
Description WorkHard.1664
It is a dangerous memory resident parasitic virus. It patches DOS kernel, hooks 21h and writes itself to the end of COM and EXE files that are executed, opened, closed or accessed by DOS functions FindFirst/Next FCB (DIR command). The virus patches DOS kernel in not correct way and may halt the computer. Before return to host program the virus infects the C:COMMAND.COM file.
The virus also hooks INT 8 (timer) and on each timer tick checks the video mode. If video mode is No 13h (graphic mode) during half an hour, the virus in displays the message and halts the computer:
Don't play game !
Work hard for China !
Check other viruses! Be aware! Use Antiviral Software
Beware.442.a
Description Beware.442.a
This is a very dangerous non memory-resident virus. It hits .COM-files by standard way in the current directory. On Monday that falls on the 1st of any month the virus erases some sectors on floppies. It also contains text: "BEWARE ME - 0.01, Copr (c) DarkGraveSoft - Moscow 1990".
BF.677
Description BF.677
It is not a dangerous memory resident parasitic virus. It hooks INT 21h and writes itself to the end of COM files that are executed. While installing the virus also infects the E:COMMAND.COM file, if it exists. The virus also intercepts file opening and cancels attempts to open *.?BF (DBF?) files.
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