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. In the Value data box, type 4, and then click OK.
Exit Registry Editor, and then restart the computer. Note The Task Scheduler service should only be disabled temporarily while you clean up the malware in your environment. This is especially true on Windows Vista and Windows Server because this step will affect various built-in Scheduled Tasks. As soon as the environment is cleaned up, re-enable the Server service. Download and manually install security update MS For more information, visit the following Microsoft Web site:.
In this scenario, you must download the update from an uninfected computer, and then transfer the update file to the infected system. We recommend that you burn the update to a CD because the burned CD is not writable. Therefore, it cannot be infected. If a recordable CD drive is not available, a removable USB memory drive may be the only way to copy the update to the infected system.
If you use a removable drive, be aware that the malware can infect the drive with an Autorun. After you copy the update to the removable drive, make sure that you change the drive to read-only mode, if the option is available for your device. If read-only mode is available, it is typically enabled by using a physical switch on the device. Then, after you copy the update file to the infected computer, check the removable drive to see whether an Autorun.
If it was, rename the Autorun. Reset any Local Admin and Domain Admin passwords to use a new strong password. In the details pane, right-click the netsvcs entry, and then click Modify. B, the service name was random letters and was at the bottom of the list. With later variants, the service name may be anywhere in the list and may seem to be more legitimate.
To verify, compare the list in the "Services table" with a similar system that is known not to be infected. Note the name of the malware service. You will need this information later in this procedure. Delete the line that contains the reference to the malware service.
Make sure that you leave a blank line feed under the last legitimate entry that is listed, and then click OK. Notes about the Services table. All the entries in the Services table are valid entries, except for the items that are highlighted in bold. The highlighted, malicious entry that is supposed to resemble the first letter is a lowercase "L. In a previous procedure, you noted the name of the malware service. In our example, the name of the malware entry was "Iaslogon.
In Registry Editor, locate and then click the following registry subkey, where BadServiceName is the name of the malware service:. Right-click the subkey in the navigation pane for the malware service name, and then click Permissions. In the Advanced Security Settings dialog box, click to select both of the following check boxes:.
Inherit from parent the permission entries that apply to child objects. Include these with entries explicitly defined here. Replace permission entries on all child objects with entries shown here that apply to child objects. Press F5 to update Registry Editor. Note the path of the referenced DLL.
Remove the malware service entry from the Run subkey in the registry. In both subkeys, locate any entry that begins with "rundll Delete the entry. Check for Autorun. Use Notepad to open each file, and then verify that it is a valid Autorun. The following is an example of a typical valid Autorun. Set Show hidden files and folders so that you can see the file. In step 12b, you noted the path of the referenced. For example, you noted a path that resembles the following:. Click Tools , and then click Folder Options.
Edit the permissions on the file to add Full Control for Everyone. Click Everyone , and then click to select the Full Control check box in the Allow column. Simply download and run the program, register your email address, choose your settings, and click the "OK" button to begin a Conficker virus scan.
Behavioral Scanning can reveal and remove virus infections in programs and binaries that look and act like malware by seeking structure anomalies, impersonation, tampering, reputation, origin and relation to other memory, file, and registry objects. Learn more about how Conficker spreads. Secure your computer with the most advanced virus removal protection technology on the market for free.
All rights reserved. Products Products for Business For Business. Security Operations. Products for Home For Home. To hide its presence in the system, the worm deletes any System Restore points created by the user, then modifies the following registry keys:.
The TMP file created is registered as a service kernel driver using the following registry entry:. Javascript is disabled in your web browser For full functionality of this site it is necessary to enable JavaScript. Classification Category :. Type :. Aliases :. AL, Win 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. For more Support Community Find the latest advice in our Community. User Guide See the user guide for your product on the Help Center. Contact Support Chat with or call an expert for help.
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