It spreads and affects other computers. It executes actions that reduce the security level of the computer. It uses stealth techniques to avoid being detected by the user. It uses anti-monitoring techniques in order to prevent it being detected by antivirus companies. It spreads, through mapped drives, via shared network resources.
Brontok.GS is a worm that spreads by copying itself, without infecting other files.
It reduces the security level of the computer: it stops processes belonging to security tools, such as antivirus programs and firewalls, leaving the computer defenseless against attacks from other malware; it changes system permissions, reducing the security level.
It uses stealth techniques to avoid being detected by the user:
• It terminates processes corresponding to several security tools, such as antivirus programs and firewalls, to prevent detection.
• It deletes the original file from which it was run once it is installed on the computer system.
It uses different methods in order to avoid detection by antivirus companies:
• It disallows scanning tools from running, such as Windows Registry Editor, FileMonitor, etc.
Brontok.GS 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.
• Computer networks (mapped drives): it generates copies of itself in mapped drives.
• Computer networks (shared resources): it creates copies of itself in shared network resources to which it has access.