In the Select Registry Key dialog box, expand Machine , and then move to the following folder:. In the dialog box that opens, click to clear the Full Control check box for both Administrators and System.
In the Add Object dialog box, click Replace existing permissions on all subkeys with inheritable permissions. This prevents the Conficker malware from creating the Scheduled Tasks that can reinfect the system.
Right-click File System , and then click Add File. Make sure that Tasks is highlighted and listed in the Folder dialog box. In the dialog box that opens, click to clear the check boxes for Full Control , Modify , and Write for both Administrators and System. Set AutoPlay Autorun features to disabled. This keeps the Conficker malware from spreading by using the AutoPlay features that are built into Windows.
NoteDepending on the version of Windows that you are using, there are different updates that you must have installed to correctly disable the Autorun functionality:. To disable the Autorun functionality in Windows Vista or in Windows Server , you must have security update installed described in security bulletin MS To disable the Autorun functionality in Windows XP, in Windows Server , or in Windows , you must have security update , update , or update installed.
To set AutoPlay Autorun features to disabled, follow these steps:. In the Turn off Autoplay dialog box, click Enabled. Allow for enough time for Group Policy settings to update to all computers. Generally, Group Policy replication takes five minutes to replicate to each domain controller, and then 90 minutes to replicate to the rest of the systems. A couple hours should be enough.
However, more time may be required, depending on the environment. After the Group Policy settings have propagated, clean the systems of malware. If your antivirus software does not detect Conficker, you can use the Microsoft Safety Scanner to clean the malware. Note The Microsoft Safety Scanner does not prevent reinfection because it is not a real-time antivirus program. This tool is available as a component of the Microsoft Desktop Optimization Pack 6. These manual steps are not required any longer and should only be used if you have no antivirus software to remove the Conficker virus.
The following detailed steps can help you manually remove Conficker from a system:. Log on to the system by using a local account. Important Do not log on to the system by using a Domain account, if it is possible.
Especially, do not log on by using a Domain Admin account. The malware impersonates the logged on user and accesses network resources by using the logged on user credentials. This behavior allows for the malware to spread. Stop the Server service.
This removes the Admin shares from the system so that the malware cannot spread by using this method. Note The Server service should only be disabled temporarily while you clean up the malware in your environment. This is especially true on production servers because this step will affect network resource availability.
As soon as the environment is cleaned up, the Server service can be re-enabled. Select Disabled in the Startup type box. ImportantThis section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully.
For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:.
Click Start , type regedit in the Start Search box, and then click regedit. Send us feedback. Tell us about your experience. Published Apr 09, Updated Sep 15, Learn about other threats.
This variant deletes its own executable on May 3 Microsoft strongly recommends that users apply the update referred to in Security Bulletin MS immediately. Microsoft also recommends that users ensure that their network passwords are strong to prevent this worm from spreading via weak administrator passwords. More information is available here.
Microsoft also recommends that users apply an update that changes the AutoPlay functionality in Windows to prevent this worm from spreading via USB drives. What to do now Microsoft strongly recommends that users apply the update referred to in Security Bulletin MS immediately. Use the Microsoft Malicious Software Removal Tool , Microsoft Security Essentials , Microsoft Safety Scanner , or another up-to-date scanning and removal tool to detect and remove this threat and other unwanted software from your computer.
Note: Computers infected by Conficker may be unable to connect to Web sites related to security applications and services that may otherwise assist in the removal of this worm for example, downloading antivirus updates may fail.
This variant of Downadup, also called Conficker , is not attempting to self-replicate and appears to behave more like a Trojan than a worm, says Vincent Weafer, vice president of Symantec Security Response.
The W32 Downadup. C variant was discovered Friday in a Symantec honeypot and is still under investigation. Symantec expects to identify additional capabilities shortly, says Weafer, who adds that Symantec has not yet seen W Downadup, Net-Worm.
Automatic action Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it. Note Downadup makes use of random extension names in order to avoid detection. During disinfection, Scanning Options should be set to: Scan all files. Please read the text file included in the ZIP for additional details.
Note: Some variants of the Downadup worm attempt to block execution of F-Secure malware removal tools. If the downloaded tool does not work, please rename the file. Example: from "f-downadup. Then try running the tool again. Microsoft Help and Support Knowledge Base Article provides numerous details for manual disinfection of Conficker. Suspect a file is incorrectly detected a False Positive? If you wish, you may also: Check for the latest database updates First check if your F-Secure security program is using the latest detection database updates , then try scanning the file again.
Submit a sample After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis. Exclude a file from further scanning If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.
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Submit a sample Submit a file or URL for further analysis.
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