Kaspersky Threats

Parent class: TrojWare

Trojans are malicious programs that perform actions which are not authorized by the user: they delete, block, modify or copy data, and they disrupt the performance of computers or computer networks. Unlike viruses and worms, the threats that fall into this category are unable to make copies of themselves or self-replicate. Trojans are classified according to the type of action they perform on an infected computer.

Class: Trojan-Downloader

Programs classified as Trojan-Downloader download and install new versions of malicious programs, including Trojans and AdWare, on victim computers. Once downloaded from the Internet, the programs are launched or included on a list of programs which will run automatically when the operating system boots up. Information about the names and locations of the programs which are downloaded are in the Trojan code, or are downloaded by the Trojan from an Internet resource (usually a web page). This type of malicious program is frequently used in the initial infection of visitors to websites which contain exploits.

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Platform: Win32

Win32 is an API on Windows NT-based operating systems (Windows XP, Windows 7, etc.) that supports execution of 32-bit applications. One of the most widespread programming platforms in the world.

Description

Removal instructions

If your computer does not have an up-to-date antivirus, or does not have an antivirus solution at all, follow the instructions below to delete the malicious program:

Delete the original Trojan file (the location will depend on how the program originally penetrated the victim machine).
Delete the following file:
```
%Temp%system.exe
```
Update your antivirus databases and perform a full scan of the computer (download a trial version of Kaspersky Anti-Virus).

Technical Details

This Trojan downloads other programs via the Internet and launches them on the victim machine without the user’s knowledge or consent. The program itself is a Windows PE EXE file. It is 3584 bytes in size. It is written in C++.

Payload

Once launched, the Trojan checks for security solutions which will block unsanctioned access to the Internet (Outpost Firewall, Zone Alarm and Symantec Internet Security). If the Trojan detects any of the programs listed above, it will delete itself from the system.

If the Trojan does not detect any security solution, it will download a file from the following link:

http://216.65.106.***/proces.exe

(At the time of writing, this link was not working.)

This file will be saved to the Windows temporary directory as "system.exe":

%Temp%system.exe

This will be then launched as a hidden process, and the Trojan will delete itself from the system.

Find out the statistics of the vulnerabilities spreading in your region on statistics.securelist.com

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