Virus Database

Constructor.VCL

Description Constructor.VCL

The virus constructor utility VCL.EXE (Virus Creation Laboratory) seems to be the most well-known virus creation tool. This constructor can generate source assembler files of the viruses, OBJ modules and infected master files. VCL contains the standard pop-up menu interface. By using VCL menus, it is possible to choose the virus type, enable or disable self encryption, anti-debugging code, and internal text strings. It also is possible to choose up to 10 effects, which are summoned upon virus execution, etc. VCL-based viruses can use a standard means for infection (they append their code to the files while infecting them), they can overwrite the files or use companion technology.
The main properties of VCL-viruses are:
they are non-memory resident;
they scan the subdirectory three or the current directory of the current drive while infecting files;
they append to COM files, or create new COM files or overwrite COM and EXE files.

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Before.2915

Description Before.2915

It is not a dangerous memory resident parasitic virus. The virus was written in Assembler and its actual code is 1164 bytes, but after that virus author compressed it with AIN executable files compressor, and result virus code (compressed actual virus code and decompression routine) grows up to 2915 bytes.
The virus hooks INT 21h and writes itself to the beginning of COM and EXE files that are executed. The virus does not infect the files: CO*, WI*, EM*, SH*, GD* (COMMAND, WIN, EMM386, all). Depending on the system time and video mode the virus disables executing files (does not allow to start games?). The virus contains the text strings:
COWIEMSHGD
BEFORE.CE.1136 (C) PC Soft Club

Bel.2124

Description Bel.2124

It is a very dangerous memory resident parasitic polymorphic virus. It hooks INT 21h and writes itself to the end of COM and EXE files that are executed or opened. The virus checks file names and does not infect files: CO*, DR*, WE*, AI*, AD*, VB*, AV*, HI*, CH*, CC*. Depending on the system date the virus deletes files with extensions: .CFG, .TIC, .PAC, .PAK, .SAV, .WAD and some other.
The virus contains the text strings:
* reBEL.P1 * üâô (Belarus).
Hi, Mr. Kolyada!

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