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Virus Encyclopedia

Welcome to the Virus Encyclopedia of Panda Security.

Grum.B

Threat LevelLow threatDamageHighDistributionNot widespread
Common name:Grum.B
Technical name:W32/Grum.B.worm
Threat level:Medium
Type:Worm
Effects:   It spreads and affects other computers. It changes the security settings of Internet Explorer. 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 does not spread automatically using its own means.
Affected platforms:

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

First detected on:April 27, 2007
Detection updated on:April 27, 2007
StatisticsNo
Proactive protection:
Yes, using TruPrevent Technologies

Brief Description 

    

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

 

It reduces the security level of the computer: it changes the security settings of Internet Explorer, decreasing its security level.

 

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

  • It modifies system permissions in order to hide itself.

 

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.

 

Grum.B does not spread automatically using its own means. It needs an attacking user's intervention in order to reach the affected computer. The means of transmission used include, among others, floppy disks, CD-ROMs, email messages with attached files, Internet downloads, FTP, IRC channels, peer-to-peer (P2P) file sharing networks, etc.

 

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