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Published Dec 28, 2009 | Updated Sep 15, 2017


Detected by Microsoft Defender Antivirus

Aliases: BackDoor-EEC.gen (McAfee) W32/Smalldoor.JDXX (Norman)


Worm:Win32/Autorun.NH is a worm that spreads by copying itself to removable drives. The worm allows remote access and control and could be instructed to spread using other methods such as via Instant Messenger (IM) and Peer-to-Peer (P2P) file sharing.
Manual removal is not recommended for this threat. To detect and remove this threat and other malicious software that may have been installed, run a full-system scan with an up-to-date antivirus product such as Microsoft Security Essentials, or the Microsoft Safety Scanner. For more information about using antivirus software, see
Recovering from recurring infections on a network
The following additional steps may need to be taken to completely remove this threat from an infected network, and to stop infections from recurring from this and other similar types of network-spreading malware:
  1. Ensure that an antivirus product is installed on ALL machines connected to the network that can access or host shares  (see above for further detail).
  2. Ensure that all available network shares are scanned with an up-to-date antivirus product.
  3. Restrict permissions as appropriate for network shares on your network. For more information on simple access control, please see:
  4. Remove any unnecessary network shares or mapped drives.
Note: Additionally it may be necessary to temporarily change the permission on network shares to read-only until the disinfection process is complete.
Additional recovery steps related to Worm:Win32/Autorun.NH
This threat may make lasting changes to an affected system’s configuration that will NOT be restored by detecting and removing this threat. For more information on returning an affected system to its pre-infected state, please see the following article/s:
If you think you have been the victim of this worm and your banking details have been stolen, you can refer to Microsoft's advice on what to do if you are a victim of fraud.
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