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Brontok.GS

Threat LevelHigh threatDamageSevereDistributionNot widespread
Common name:Brontok.GS
Technical name:W32/Brontok.GS.worm
Threat level:Medium
Type:Worm
Effects:   It spreads and affects other computers. It carries out actions that decrease 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 , via mapped drives, through shared network resources.
Affected platforms:

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

First detected on:April 15, 2007
Detection updated on:April 23, 2010
StatisticsNo
Yes, using TruPrevent Technologies

Brief Description 

    

Brontok.GS is a worm that spreads by copying itself, without infecting other files.

 

It reduces the security level of the computer: it terminates processes belonging to security tools, such as antivirus programs and firewalls, leaving the computer defenseless against attacks from other malware; it changes system permissions, decreasing 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.

 

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.

 

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 creates copies of itself in mapped drives.
  • Computer networks (shared resources): it creates copies of itself in shared network resources to which it has access.

 

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