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Chat with or call an expert for help. A which is able to spread copies of itself over a network using three different methods: file sharing, exploitation of a vulnerability and exploitation of Windows Autorun. In addition to attempting to connect to remote sites, Conficker.
AL uses stealth techniques to hide its actions, and makes a number of changes to the Windows Registry. The worm then creates autorun entries in the registry, which ensure that a copy of the worm is executed at every system startup.
The worm disables a number of system features, in order to facilitate its activities. It disables the following Windows services:. The worm also hooks the following API's in order to block access when the user attempts to access a long list of domains:. If the user attempts to access the following, primarily security-related domains, their access is blocked:.
To propagate itself, the worm first modifies the following registry entry so that it can spread more rapidly across a network:.
It checks for a suitable computer around the network using NetServerEnum, then attempts to log on to any found computer with one of the following login credentials:. It then creates a scheduled daily job on the remote server, in order to execute the following command:. A for additional details. The worm is also able to propagate by downloading a copy of itself onto other machines vulnerable to an exploit of the critical MS vulnerability.
Creating the HTTP server allows the malware to send out specially crafted packets exploit code from the infected machine to other machines. If the exploit is successful, the targeted machine is forced to download a copy of the malware from the first infected machine. Downadup is capable of downloading files onto the infected system. First, the worm connects to one of the following domains to obtain the current system date:. The obtained system date is used to generate a list of domains where the malware can download additional files.
D attempts to determine the time in GMT so that all port changes occur at the same time. D versions:. Take these steps to help prevent infection on your computer. The following could indicate that you have this threat on your PC :. Send us feedback. Tell us about your experience. Published Mar 06, Updated Sep 15, Learn about other threats. Summary Windows Defender detects and removes this threat.
What to do now The following free Microsoft software detects and removes this threat: Microsoft Defender Antivirus for Windows 10 and Windows 8. Create strong passwords for your network. Technical information about network passwords is available in the article Frequently asked questions about passwords.
Technical information Threat behavior This is a worm that infects other computers across a network by exploiting a vulnerability in the Windows Server service svchost. If the vulnerability is successfully exploited, it could allow remote code execution when file sharing is enabled. It may also spread via removable drives and weak administrator passwords. It disables several important system services and security products.
This threat attempts to copy itself in the Windows system folder as a hidden DLL file using a random name. List Windows Security Center Service wscsvc — notifies you of security settings for example, Windows update, Firewall and Antivirus.
Windows Update Auto Update Service wuauserv. If the user attempts to access the following, primarily security-related domains, their access is blocked:. Downadup is capable of downloading files onto the infected system. First, the worm connects to one of the following domains to obtain the current system date:.
The obtained system date is used to generate a list of domains where the worm then attempts to download additional files. It then verifies whether the current date is at least April 1, If so, it downloads and execute files from:. The worm connects itself to a peer-to-peer network. A significant number of UDP connections can be observed when the worm is attempting to connect to its P2P network..
Javascript is disabled in your web browser For full functionality of this site it is necessary to enable JavaScript. Classification Category :. Type :. Aliases :. Removal Automatic action Suspect a file is incorrectly detected a False Positive? Suspect a file is incorrectly detected a False Positive?
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