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Panda Protection

Virus Encyclopedia

Welcome to the Virus Encyclopedia of Panda Security.

Grum.L

Threat LevelLow threatDamageHighDistributionNot widespread
Common name:Grum.L
Technical name:W32/Grum.L
Threat level:Medium
Type:Virus
Effects:   It carries out damaging actions on the affected computer. 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 18, 2007
Detection updated on:June 18, 2007
StatisticsNo
Proactive protection:
Yes, using TruPrevent Technologies

Brief Description 

    

Grum.L 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: .

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.L 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.