Trojans are malicious applications that pose themselves as legitimate software in order to trick users to install them. Once on the victim's machine, it may run any number of malicious process to steal vital information or inflict damage to other software.
From the Website:
Trojan with MSN password stealer. PEST v1.0 was writen in Delphi 6.0 and has all the usual features that you will find in most client/server programs. It has open/close cd-rom, File manager (with working upload function, yay!), Edit server function with ICQ IP informer, window manager, task manager, etc. etc. The feature that I think distinguises PEST v1.0 from any other Client/Server program is the new MSN messenger informer utility. When the victim runs the binded 'server with MSN informer.exe' supplied with PEST v1.0 (there are 2 versions of the server supplied, the version with MSN informer cannot be edited, and always runs on the PEST default port 11831), the MSN informer utility is installed onto their computer. The utility starts up with windows on the victims computer, so you can always get their IP address again if they go offline.'
3.2: From the doc: 'a remote client & server. It connects to a computer with a server. You are able to edit the server but not many server editing options. The server runs when windows starts up and is undetected by virus scanners. PEST is one of the best Server & Client programs. You can dowload files,upload files and view their files. You have full control over the victims PC! You can control the mouse, you can screw around with the victims windows Os. You can open/close CD-ROM, you can get their saved passwords, you can get their computer info, you can change windows colors, you can send a messagebox, you can chat with your victim, you have full control over shutdown, you can even view his screen, and you can do much much much more!'
4.0: From the code: 'The PEST Batch File Editor allows you to create your own very, very simple DOS based program, and run it on the remote computer. Just enter your commands into the batch file editor and click send, and your program will instantly be run on the remote computer