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Published Mar 04, 2008 | Updated Sep 15, 2017

Worm:Win32/Brontok.GA@mm

Detected by Microsoft Defender Antivirus

Aliases: Worm/Win32.Brontok (AhnLab) W32/Brontok.C.gen!Eldorado (Command) W32/Ircbot.CMCM (Norman) I-Worm/Brontok.A (AVG) Win32.Brontok.AP@mm (BitDefender) Win32.Virut.56 (Dr.Web) Win32/Brontok.B worm (ESET) Email-Worm.Win32.Brontok (Ikarus) Virus.Win32.Virut.ce (Kaspersky) W32/Rontokbro@MM (McAfee) Worm.Brontok!2A60 (Rising AV) W32.Virut.CF (Symantec) PE_VIRUX.R-3 (Trend Micro)

Summary

Worm:Win32/Brontok.GA@mm is a worm that spreads via email and network shares. It usually uses a folder icon for its file, in an attempt to trick you into thinking it's a normal folder.

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:

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.

Enabling registry editor

This threat may modify the computer to prevent Registry Editor from running. To enable Registry Editor in your computer, please do the following:

  1. Run a command prompt. Click Start>Run and type cmd.
  2. In the command prompt, type the following as is and press Enter:
    reg.exe add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableRegistryTools /t REG_DWORD /d 0 /f
  3. Type exit at the command prompt.
Enabling the command prompt

This threat may disable the command prompt, which further prevents you from reversing its other computer changes. To enable the command prompt, follow these instructions:

  1. Using an administrator account, open the Group Policy Object Editor. To do this, go to Start and in the search box, type gpedit.msc.
  2. The Group Policy Object Editor should open. Go to Local Computer Policy>User Configuration>Administrative Templates>System and select Prevent access to the command prompt.
  3. Double-click on Prevent access to the command promptand select Enable.
  4. Press OK and exit the Local Group Policy Editor.
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