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Published Jun 19, 2008 | Updated Sep 15, 2017

Worm:Win32/Autorun.CH

Detected by Microsoft Defender Antivirus

Aliases: No associated aliases

Summary

Worm:Win32/Autorun.CH is a worm that spreads by dropping copies of itself onto all available removable drives. It also drops other malware and modifies system security settings.
To detect and remove this threat and other malicious software that may be installed on your computer, run a full-system scan with an appropriate, up-to-date, security solution. The following Microsoft products detect and remove this threat:
Disable Autorun functionality

This threat attempts to spread via removable drives on computers that support Autorun functionality. This is a particularly common method of spreading for many current malware families. For information on disabling Autorun functionality, please see the following article:
http://support.microsoft.com/kb/967715/

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 computers connected to the network that can access or host shares.
  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: http://technet.microsoft.com/library/bb456977.aspx.
  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 remediation instructions for Worm:Win32/Autorun.CH

This threat may make lasting changes to you computer's configuration that are NOT restored by detecting and removing this threat. For more information on returning an infected computer to its pre-infected state, please see the following articles:

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