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Category: Malware

Type: Worm

Aliases: Worm:W32/Dorkbot.M


Worm:W32/Dorkbot is a detection for maliciously modified shortcut (.LNK) files that are designed to trick users into unwittingly launching the Dorkbot worm.


Automatic action

Based on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the detected program or file, or ask you for a desired action.

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Technical Details

The Dorkbot worm can spread through malicious links sent in messages over social media networks, which point to and download a copy of the worm onto the machines of users who click on the link. In some cases, the worm may also be installed as part of the payload of other malware that is spread using the same route.

The worm can also spread via infected removable drives. To do so, it creates a folder named RECYCLER on all removable drives and drops a copy of itself in the folder. It then drops shortcut LNK files onto the infected machine pointing to the copies in the removable drives, so that clicking on these LNK files will launch the associated worm files.

Dorkbot also drops an AUTORUN.INF file that automatically executes the worm copies each time the user accesses one of the removable drives.

Once Dorkbot is active on a machine, it can serve as a backdoor by contacting a remote command and control (C&C) server and executing instructions issued by an attacker. Malicious actions it can perform include:

  • Monitoring web browser activity
  • Stealing website login credentials
  • Downloading additional malware onto the system
  • Hijacking the user's social media accounts to spread copies of itself

And so on.

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