Drzip.512
Description Drzip.512
It is not a dangerous memory resident encrypted parasitic virus. It hooks INT 21h and writes itself at the begin of COM files that are accessed. The virus also encrypts hole host file. On opening ZIP files the virus reads their headers, looks for ZIP archive signature and overwrites its. As a result ZIP archives become damaged.
The virus contains the text string:
[SMF.DrZip]
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BackTime.512
Description BackTime.512
This is a dangerous memory-resident virus. It hooks INT 8 (timer), and INT 21h and hits COM files by a standard way when they are executed.
The virus manifests itself on CGA-adapter only, it 'shakes' the screen. It also contains the text "Shaker".
BackTime.528
Description BackTime.528
This is a dangerous memory-resident virus. It hooks INT 8 (timer), and INT 21h and hits COM files by a standard way when they are executed.
The virus contains the text "BackTime". This virus sets the system timer in back direction: when the INT 8 is called the virus decrements the content of timer counter. At a result the programs that uses the timer characteristics of computer (like a BenchMarks) are hang-up.
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