![]() ![]() It does this by modifying the following registry entry: Win32/Conficker.C changes system settings so you cannot view hidden files. The worm creates a thread that continuously accepts URLs from the pipe to download, authenticate, and run files. Win32/Conficker.C creates a named pipe with the following name on Windows 2000: The payload only runs if it is successfully validated by the malware.įor non- Windows 2000 machines, the worm downloads the file and runs it if it passes authentication. Win32/Conficker.C checks for a specific pattern in incoming shellcode (to identify if the origin is valid) and a URL to download an updated payload from. The vulnerability is documented in Microsoft Security Bulletin MS08-067. If the vulnerability is successfully exploited, the worm instructs the target computer to download a copy of the worm from the host computer via HTTP using the random port between 100 opened by the worm. Worm:Win32/Conficker.C spreads to systems that are not yet patched against a vulnerability in the Windows Server service ( svchost.exe). The highlighted choice under " General options" in the image above would allow a user to view the share and not run the worm. Another hint that the action is to run the worm is the text " Publisher not specified". Note that the language in the first option suggests the user could " Open folder to view files" however the option is under " Install or run program", an indication that opening the folder will actually run an application. dll," to activate the copy, as shown in the images below: dll.Īfter remotely infecting a computer, Win32/Conficker.C creates a remotely scheduled job with the command “rundll32.exe. If Win32/Conficker.C successfully accesses the target machine, for example, if a combination of any of the user names and one of the above passwords allows write privileges to the machine, it copies itself to an accessible admin share as ADMIN$\System32\. It then attempts to connect to the target machine using each user name and the following weak passwords: If this method is unsuccessful, for example, the current user does not have the necessary rights, it instead obtains a list of user accounts on the target machine. It first attempts to drop a copy of itself in a computer's ADMIN$ share using the credentials of the currently logged-on user. Worm:Win32/Conficker.C attempts to infect machines within the network. The worm patches NETAPI32.DLL in memory to prevent re-infection and further exploitation of the vulnerability addressed by Microsoft Security Bulletin MS08-067. Deploying MSRT in an enterprise environment.More information about deploying MSRT in an enterprise environment can be found in the following article: Virus alert for Win32/Conficker and manual removal instructions.Microsoft Help and Support has provided a detailed guide to removing a Conficker infection from an affected computer, either manually or by using the Malicious Software Removal Tool ( MSRT).įor detailed instructions on how to manually remove Conficker, view the following article using an uninfected computer: In this case you will need to use an uninfected computer to download any appropriate updates or tools and then transfer these to the infected computer. If your computer is infected by Conficker, it might not be unable to connect to websites related to security applications and services that can help remove it (for example, downloading antivirus updates may fail). Microsoft Windows Malicious Software Removal Tool.To detect and remove this threat and other malicious software that may be installed in your computer, run a full-system scan with an up-to-date antivirus product such as the following: Apply the update in Microsoft Knowledgebase Article KB971029 that changes the Autoplay functionality in Windows.
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