Tremor
Description Tremor
It is not a dangerous memory resident parasitic stealth static sized polymorphic virus, infected files increase in size by 4000 bytes. It hooks INT 1, 15h, 21h and stays memory resident. If there are enough Upper Memory, this virus copies itself into UMB. If not, it corrects MCB list of the conventional memory and copies itself at the top of the memory. While installing memory resident the virus traces the vectors and checks the memory for some code and functions to defeat memory resident anti-virus software.
By hooking INT 1 it traces the interrupt vectors. The hooking INT 15h is used for trigger routine, under some conditions the virus displays:
-=> T?R?E?M?O?R was done by NEUROBASHER / May-June'92, Germany <=-
-MOMENT-OF-TERROR-IS-THE-BEGINNING-OF-LIFE-
Sometimes it 'shakes' the screen. INT 21h hooking is used for stealth routines and file infection. This virus writes itself to the end of COM and EXE files that are accessed.
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AllFools.659
Description AllFools.659
It is not a dangerous nonmemory resident parasitic virus. It searches for .COM-files, then writes itself to the end of the file. On April 1st the virus displays the message:
Hey, it's All Fools Day! -- Press a key
The virus also contains the internal text string:
PV
*.COM
Alpha.2000
Description Alpha.2000
It's a not dangerous memory resident parasitic stealth virus. It hooks INT 21h and writes itself at the end of COM-, EXE- and SYS-files that are accessed. On execution or opening of infected file the virus disinfects it. Sometimes it displays the message:
"ALPHA STRIKE" Advanced Tactical Viral Implant by NEUROBASHER'93 /
Germany
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