BadSectors.3150
Description BadSectors.3150
These are dangerous memory resident parasitic viruses. They hook INT 8, 16h, 21h, 25h, 26h. On DOS calls FindFirst/FindNext FCB/ASCII they search for COM and EXE files and write themselves to the end of the file. They also infect the files that are opened, executed or renamed. The viruses do not infect the SCAN.* files. Sometimes they mark the disk clusters as bad ones by manipulation with FAT sectors. By hooking INT 16h these viruses joke with keyboard. These viruses contain the internal text strings:
COMEXE
SCAN
and:
"BadSectors.3150": BadSectors 1.0
"BadSectors.3422": BadSectors 1.1
"BadSectors.3428": BadSectors 1.2
"BadSectors.3627:: BadSectors 1.3
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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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