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Published Dec 20, 2007 | Updated Sep 15, 2017

Virus:Win32/Mabezat.B

Detected by Microsoft Defender Antivirus

Aliases: Win32/Mabezat.worm.32768 (AhnLab) W32/AutoRun.APZ (Norman) W32/Mabezat-B (Sophos) W32.Mabezat-3 (Clam AV) Win32/Mabezat.A (ESET) Worm.Win32.Mabezat.b (other) Worm.Win32.Mabezat.b (Kaspersky) Win32.Worm.Mabezat.C (Sunbelt Software) W32/Mabezat.a (McAfee)

Summary

Windows Defender  detects and removes this threat.

Virus:Win32/Mabezat.B is a polymorphic virus that infects Windows executable files. Apart from spreading through file infection, it also attempts to spread through e-mail attachments, network shares, removable drives and by CD-burning. It also contains a date-based payload that encrypts files with particular extensions.

Find out ways that malware can get on your PC.

 
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 http://www.microsoft.com/security/antivirus/av.aspx.
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: 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.
Disable Autorun functionality
Virus:Win32/Mabezat.B 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:
 
Use cloud protection

The Microsoft Active Protection Service (MAPS) uses cloud protection to help guard against the latest malware threats. It’s turned on by default for Microsoft Security Essentials and Windows Defender for Windows 10. 

Get more help

You can also see 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.

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