Windows 2003/XP/2000/NT/ME/98/95

Banker.GRZ is a Trojan, which although seemingly inoffensive, can actually carry out attacks and intrusions.

It affects productivity, preventing tasks from being carried out:

• In the affected computer: causes system slowdowns.

Banker.GRZ prevents access from programs to websites of several companies related with security tools (antivirus programs, firewalls, etc.).

It uses stealth techniques to avoid being detected by the user:

• It uses techniques included in its code to hide itself while it is active.

It uses several methods in order to avoid detection by antivirus companies:

• It prevents scanning tools from running, such as Windows Registry Editor, FileMonitor, etc.

Banker.GRZ uses the following propagation or distribution methods:

• Exploiting vulnerabilities with the intervention of the user: exploiting vulnerabilities in file formats or applications. To exploit them successfully it needs the intervention of the user: opening files, viewing malicious web pages, reading emails, etc.
• Via Internet, exploiting remote vulnerabilities: attacking random IP addresses, in which it tries to insert a copy of itself by exploiting one or more vulnerabilities.