Published Sep 09, 2010 | Updated Sep 15, 2017


Severe |Detected with Windows Defender Antivirus

Aliases: WIN.WORM.Virus (Dr.Web) W32/VBMania@MM (McAfee) Worm:Win32/VB.WF (other) W32/Autorun-BHO (Sophos) "Here you have virus" (other)


Worm:Win32/Visal.B is a worm that spreads to other computers on a network from drives C: through H: and via email. When spreading through email, the message contains a link to the worm hosted on a remote server. The file icon resembles a PDF document to maximize the chance of execution. The worm attempts to download arbitrary files and create a full-access share on the local computer as "updates".
To detect and remove this threat and other malicious software that may be installed in your computer, run a full-system scan with an up-to-date antivirus product such as the following:
For more information on 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 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:
  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/Visal.B
This threat may make lasting changes to a 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 article/s: 
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