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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.