Angel_2 Family
Description Angel_2 Family
These are dangerous memory resident parasitic viruses. They hook INT 21h and writes itself to the end of COM- and EXE-files.
Angel_2.661
It hits the files that are executed. The virus checks the code of the programs that are executing, and in some cases patches that code (to disable some anti-virus scanner?). The virus contains the internal text string:
v6 Angel
Angel_2.1571
It is an encrypted virus. It hits the files that are accessed. The virus has the bug and can infect data files as COM ones.
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Shadowbyte.635
Description Shadowbyte.635
This is a very dangerous non-memory resident parasitic virus. It scans the subdirectory tree, and writes itself to the end of COM files. In July, it formats A: and C: drives, and displays the following message:
Shadowbyte Lives!
And then emits a sound on the speaker like a "dying" hard disk.
Shake
Description Shake
This is a very dangerous memory resident parasitic virus. It hooks INT 21h. On GetDiskSpace DOS calls (INT 21, ah=36h) the virus searches for .COM files of the current directory, then writes itself to the end of the file. In infected files it sets the time to 60 sec. The virus hooks and does not restore INT 24h. When an infected program is executed, the virus with the probability of 1/16 displays:
Shake well before use
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