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Panda Protection

Virus Encyclopedia

Welcome to the Virus Encyclopedia of Panda Security.

W32/Virutas.H

Threat LevelLow threatDamageHighDistributionNot widespread
Common name:W32/Virutas.H
Technical name:W32/Virutas.H
Threat level:Medium
Type:Virus
Effects:   It carries out damaging actions on the affected computer. It generates a large amount of network traffic activity with the consequent consumption of bandwidth. It awaits remote-control orders to carry out. It uses stealth techniques to avoid being detected by the user. It spreads , via IRC, by infecting files that are then distributed.
Affected platforms:

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

First detected on:March 14, 2007
Detection updated on:March 14, 2007
StatisticsNo
Proactive protection:
Yes, using TruPrevent Technologies

Brief Description 

    

W32/Virutas.H is a virus that spreads to other computers by copying its code to other files or programs.

 

  • In the local network: it generates a large amount of network activity and consumes bandwidth.

 

It reduces the security level of the computer: it awaits remote-control orders received through IRC.

 

It uses stealth techniques to avoid being detected by the user:

  • It deletes the original file from which it was run once it is installed on the computer.

 

W32/Virutas.H 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.
  • IRC: It sends a copy of itself to all users connected to the channel to which the infected user is connected.
  • 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.

 

W32/Virutas.H 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.
  • Link: it modifies the links that indicate to the operating system where files are stored. It redirects the links to the virus instead of to the original files. When users try to open a file infected by a link virus, they will actually be running the virus. Once infection has been carried out, it will be impossible to work with the original files.