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Virus Name - W32.Virut.CF

Created: 21 Oct 2012 • Updated: 02 Nov 2012 | 11 comments
This issue has been solved. See solution.

Virus detected in system reportedto server in Risk

Virus Name - W32.Virut.CF

Version - 11.0.6005



Comments 11 CommentsJump to latest comment

rs_cert's picture

W32.Virut.CF is a virus that infects .exe and .scr files on the compromised computer

Removal Tool

Removal Tool

If you have an infected Windows system file, you may need to replace them using from the Windows installation CD.

How to reduce the risk of infection
The following resource provides further information and best practices to help reduce the risk of infection.
Protecting your business network

The following instructions pertain to all current Symantec antivirus products.

1. Performing a full system scan
How to run a full system scan using your Symantec product

2. Restoring settings in the registry
Many risks make modifications to the registry, which could impact the functionality or performance of the compromised computer. While many of these modifications can be restored through various Windows components, it may be necessary to edit the registry. See in the Technical Details of this writeup for information about which registry keys were created or modified. Delete registry subkeys and entries created by the risk and return all modified registry entries to their previous values.

Ashish-Sharma's picture

The remote attacker may use the following nick name:

It may use the following registry entry in binary format in order to decode an unknown server name and port number:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\"UpdateHost" = "[BINARY VALUE]"

The threat disables Windows File Protection in order to infect files on the computer.

It also modifies the following registry subkey in order to add a firewall exception:

The virus also attempts to download files on the compromised computer.


Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

  • Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
  • Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
  • Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
  • Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
  • Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
  • Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
  • If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
  • Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
  • Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
  • Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
  • Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
  • If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
  • For further information on the terms used in this document, please refer to the Security Response glossary.

W32.Virut.CF - Removal

Thanks In Advance

Ashish Sharma

Chetan Savade's picture


Could you please check this thread.

Check this blog as well

Best practice to troubleshoot virus on the network

IF not helped,

Use Symantec endpoint Protection Support Tool with Power Eraser (eliminates deeply embedded and difficult to remove threats that traditional virus scanning doesn't always detect) following the article:
Support Tool with Power Eraser Tool included

Check the loadpoints on your machine:
How to use the Load Point Analysis within the Symantec Support Tool to help locate suspicious files

If you manage to identify infected files and thay are not detected by SEP, please submit the files using this link:

Chetan Savade
Sr.Technical Support Engineer, Endpoint Security
Enterprise Technical Support

Don't forget to mark your thread as 'SOLVED' with the answer that best helps you.<

Mithun Sanghavi's picture

Hello Ashoka,

You have provided very limited details.

Could you please provide us the file name and path of the file located on? If possible please provide us a screenshot.

W32.Virut.CF is a virus that infects .exe and .scr files on the compromised computer.

The W32.Virut.CF is one of the Variants of W32.Virut


  • Discovered:April 11, 2007
  • Updated:March 3, 2010 9:19:06 AM
The Variant W32.Virut.CF
Discovered:February 4, 2009
Updated:February 4, 2009 6:14:14 PM

Others Variants of W32.Virut are :

Symantec has created the Tool for W32.Virut.CF

I would Recommend you to apply Application and Device Control meant for W32.Virut. Check this -

This particular ADC policy can be used to help combat an outbreak of this threat by slowing down or eliminating its ability to spread from one computer to another.

Also check this Thread:

Hope that helps!!

Mithun Sanghavi
Associate Security Architect


Don't forget to mark your thread as 'SOLVED' with the answer that best helped you.

ᗺrian's picture

What was the action taken? If cleaned, deleted, or quarantined than SEP did its job and no further action is needed.

Please click the "Mark as solution" link at bottom left on the post that best answers your question. This will benefit admins looking for a solution to the same problem.

honey_jack's picture

I am agree with Mithun provide the more detail.

How many system infected with this virus file?

Have you scan the infected system in safe mode?

If scanned then virus removed or still reflected?

Try the removal tool which has mentioned on above other comments.

Thanks & Regard

Honey Jack

If your issue has been solved, please use the "Mark as Solution" for the valid thread.

rs_cert's picture

Hi- What is the current status of virus?

Removed or still pending?

cus000's picture

No idea what thread starter want.....

as always for infection... try to detect the source host/infection method and clean or block it...

akgs's picture

Find the attach detail, these are details of virus reflected on server

Event Actual Action - Virus found (Details pending)
Operating System - Window 7
Risk Name Source - W32.Virut.CF Auto-Protect scan
Filepath - F:\New.exe
Count - 1

Event Actual Action - Virus found (Details pending)
Operating System - Window 7
Risk Name Source - W32.Virut.CF Auto-Protect scan
Filepath - G:\file.exe
Count - 1

rs_cert's picture

Have you checked the local drive are availble on that infected system with this drive letter?

Hopefully This virus is avail on USB Device, so that it's showing in pending. Check it and scan that drive or clean it.

Also avoid to use the un-official device in official bay. It can help to virus free network.

akgs's picture

I hav checked and found this drive is USB. Thanks now usb drive/device scanned and removed virus from there.

thanks all for your valuable comments