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Panda Protection

Virus Encyclopedia

Welcome to the Virus Encyclopedia of Panda Security.

Grum.I

Threat LevelLow threatDamageHighDistributionNot widespread
Common name:Grum.I
Technical name:W32/Grum.I.worm
Threat level:Medium
Type:Worm
Effects:   It spreads and affects other computers. It sends the information it has captured to a remote user. It mass mails junk mail (spam). 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 spreads , via email, via mapped drives.
Affected platforms:

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

First detected on:June 8, 2007
Detection updated on:June 8, 2007
StatisticsNo
Proactive protection:
Yes, using TruPrevent Technologies

Brief Description 

    

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

 

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

It sends the gathered information to a remote user by any available means: email, FTP, etc.

 

  • On remote sites: it mass mails junk mail (spam).

 

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 uses techniques included in its code to hide itself while it is active.
  • 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.
  • It terminates its own execution if it detects that a debugging program is active.

 

Grum.I 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.
  • Email: sending emails that include a copy of itself as an attachment. The computer is infected when the attachment is run.
  • Computer networks (mapped drives): it creates copies of itself in mapped drives.