Trojan.Win32.Vilsel

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

A malicious program designed to electronically spy on the user’s activities (intercept keyboard input, take screenshots, capture a list of active applications, etc.). The collected information is sent to the cybercriminal by various means, including email, FTP, and HTTP (by sending data in a request).

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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

This malware family poses a critical security threat to infected computers. After obtaining control of an infected computer, the malware copies itself under random names to the %temp%, %windir%, and %appdata% folders. These copies are then added to the list of programs automatically run at startup of the operating system. The malware also sends GET HTTP requests to download files from the cybercriminal's server and makes changes to the Windows Registry on the infected computer. The most common changes to the Windows Registry include:

• Disabling of system programs and services, such as:
  • Windows Firewall
  • Task Manager
  • Registry Editor
  • User Account Control (UAC)
• Adding registry entries for Windows services

Top 10 countries with most attacked users (% of total attacks)

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