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Panda Protection

Virus Encyclopedia

Welcome to the Virus Encyclopedia of Panda Security.

TDSS.CW

Threat LevelLow threatDamageHighDistributionNot widespread
Common name:TDSS.CW
Technical name:Trj/TDSS.CW
Threat level:Medium
Alias:Packed.Win32.TDSS.z,
Type:Trojan
Effects:   It allows to get into the affected computer. It uses the infected computer to take malicious actions on other users. It uses stealth techniques to avoid being detected by the user. It spreads , across the Internet, via mapped drives, through shared network resources, by infecting files that are then distributed.
Affected platforms:

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

First detected on:Nov. 16, 2009
Detection updated on:Nov. 16, 2009
StatisticsNo

Brief Description 

    

TDSS.CW 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: it converts the computer into a platform for taking malicious action surreptitiously: spam sending, launch of Denial of Service attacks, malware distribution, 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 injects itself in running processes.
  • It deletes the original file from which it was run once it is installed on the computer.

 

TDSS.CW 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.
  • 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.
  • File infection: it infects different types of files, which are then distributed through any of the usual means: floppy disks, email messages with attachments, Internet download, files transferred via FTP, IRC channels, P2P file sharing networks, etc.