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Panda Protection

Virus Encyclopedia

Welcome to the Virus Encyclopedia of Panda Security.

Sinowal.WUH

Threat LevelLow threatDamageHighDistributionNot widespread
Common name:Sinowal.WUH
Technical name:W32/Sinowal.WUH
Threat level:Medium
Type:Virus
Effects:   It carries out damaging actions on the affected computer. It searches for and steals passwords saved for certain Windows services. 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 , across the Internet.
Affected platforms:

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

First detected on:Jan. 22, 2010
Detection updated on:Jan. 22, 2010
StatisticsNo

Brief Description 

    

Sinowal.WUH is a virus that spreads to other computers by copying its code to other files or programs.

 

It captures certain information entered or saved by the user, with the corresponding threat to privacy: passwords saved by certain Windows services.

 

It reduces the security level of the computer: it changes the security settings of Internet Explorer, decreasing its security level; it awaits remote-control orders received through HTTP; it changes system permissions, decreasing the security level.

 

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.

 

It uses several methods in order to avoid detection by antivirus companies:

  • It terminates its own execution if it detects that it is being executed in a virtual machine environment, such as VMWare or VirtualPC.
  • It prevents scanning tools from running, such as Windows Registry Editor, FileMonitor, etc.

 

Sinowal.WUH 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.

 

Sinowal.WUH uses the following infection strategies:

  • Resident: once it has been run, the virus goes memory resident and stops functions belonging to the operating system. Therefore, every time the operating system or an application tries to access any of these functions, the virus will activate and infect new files.