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Panda Protection

Virus Encyclopedia

Welcome to the Virus Encyclopedia of Panda Security.

Pykser.B

Threat LevelLow threatDamageHighDistributionNot widespread
Common name:Pykser.B
Technical name:W32/Pykser.B.worm
Threat level:Medium
Type:Worm
Effects:   It spreads and affects other computers. It downloads or drops other malware. It downloads files from several websites. It uses stealth techniques to avoid being detected by the user. It spreads , across the Internet, through instant messaging, by infecting files that are then distributed.
Affected platforms:

Windows 2003/XP/2000/NT

First detected on:April 30, 2007
Detection updated on:April 30, 2007
StatisticsNo
Proactive protection:
Yes, using TruPrevent Technologies

Brief Description 

    

Pykser.B is a worm that spreads by copying itself, without infecting other files.

 

It affects productivity, preventing tasks from being carried out:

  • In the affected computer: .

 

Pykser.B accesses several websites to download files, which it then runs. These can be any type of file, although they are normally malware.

 

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.

 

Pykser.B 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.
  • Instant messaging: it sends links pointing to a copy of itself to all users included in the infected user's contacts list.
  • 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.

 

Visible Symptoms

 

Pykser.B is easy to recognize, as it shows the following symptoms:

  • It displays false error messages when it is run.