Microsoft security software detects and removes this threat.

This threat is a worm, which means it spreads from PC to PC. This particular worm spreads by copying itself to mapped network or removable drives. If someone tries to open that drive from another PC, their PC will be infected.

Find out ways that malware can get on your PC.  


What to do now

Use the following free Microsoft software to detect and remove this threat:

You should also run a full scan. A full scan might find other, hidden malware.

Disable Autorun

This threat tries to use the Windows Autorun function to spread via removable drives, like USB flash drives. You can disable Autorun to prevent worms from spreading:

Scan removable drives

Remember to scan any removable or portable drives. If you have Microsoft security software, see this topic on our software help page:

Enable MAPS 

Enable the Microsoft Active Protection Service (MAPS) on your system to protect your enterprise software security infrastructure in the cloud.

  1. Check if MAPS is enabled in your Microsoft security product:

    1. Select Settings and then select MAPS.

    2. Select Advanced membership, then click Save changes. With the MAPS option enabled, your Microsoft anti-malware security product can take full advantage of Microsoft's cloud protection service

  2. Join the Microsoft Active Protection Service Community
Get more help

You can also visit our advanced troubleshooting page or search the Microsoft virus and malware community for more help.

If you’re using Windows XP, see our Windows XP end of support page.

Threat behavior

Spreads via…

Mapped drives

The worm checks all the drives on your PC until it finds a mapped drive. It then tries to copy itself to that drive, and creates an autorun configuration file named autorun.inf.

Autorun configuration files are used by many different software and are designed to automatically launch or open a program whenever you access the drive that has the file. This is most often used on CDs or DVDs for installing software.

In this case, the file is used to automatically run the worm on your PC.


Alerts from your security software may be the only symptom.


Alert level: Severe
This entry was first published on: Feb 04, 2011
This entry was updated on: Jun 02, 2015

This threat is also detected as:
No known aliases