You should also:. More information about deploying MSRT in an enterprise environment can be found in the following article:. You can also visit our advanced troubleshooting page or search the Microsoft virus and malware community for more help. It creates the following registry entry to ensure that it is run whenever you start your PC:. It may also load itself as a service that is launched when the netsvcs group is loaded by the system file svchost.
The service name it uses under the netsvcs group is generated by randomly picking and combining two phrases from each of the following lists:. It can use a display name that is created by combining two of the following strings:. It may also combine random characters to create the display name. Ends services. This worm ends several important system services, such as the following:. Deletes registry values. Terminates processes. D polls the process list every one second for these strings and, if found, ends them:.
Blocks access to web sites. D may cause browser time-outs when you try to access websites with URLs containing any of the following strings:. While, Version D counters pseudorandom domain names by generating daily a pool of 50 thousand domains across TLDs, from which it randomly selects to attempt for that day. The generated domain names were also shortened from 8 — 11 to 4 — 9 characters to make them more difficult to detect with heuristics.
Malware is one of the biggest threats on the Internet. This post provides information about different types of malware and you can know how to avoid them. The shortened generated names are expected to collide with — existing domains each day, potentially resulting in a DDoS Distributed Denial-of-service attack on websites serving those domains.
Yet, the large number of generated domains and the fact that not every domain will be contacted for a given day will probably prevent DDoS situations. Besides the wonderful infection and propagation mechanisms, Conficker also has advanced self-protecting systems. DLL to block lookups of anti-malware-related sites. What websites are Vimm. How to keep safe while using Vimm? Version D of Conficker also disables Safe Mode. Together with version E, version D also kills anti-malware by scanning for and terminating processes with names of anti-malware, patch, or diagnostic tools at one-second intervals.
Moreover, each version of Conficker ends up updating itself to the next version or higher versions. Especially, the final version of Conficker, version E, also downloads and installs malware payload, Waledac spambot and SpyProtect scareware.
Though Conficker won't cause data loss to victims, it does increase the network payload of them greatly. Thus, the infected computers will experience slow network performance and it will influence the usage of them. Then, how to protect yourself from being infected by Conficker? Below suggestions are listed for your reference. If you are still using an old OS that is vulnerable to virus Conficker, the most urgent thing is to update Windows better to its newest version.
Therefore, you have shut down the backdoor for the malware. How to determine whether your system is vulnerable to Conficker or not? Generally, if you are using Windows 7 or later edition, you are safe from Conficker. If you are running a system earlier than Windows 7, especially with MS network service, you are probably to be infected by Conficker. Just update your OS will solve the problem! How to restore files from Avast Virus Chest? How to delete a file from Avast Virus Chest?
Since one of the spreading ways of Conficker is through USB flash media or shares, you are strongly recommended to pay attention to the removable devices you are going to connected to your computer and shared files you received you are going to open, especially the unauthorized devices and shares from strangers.
What should you do? 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. 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.
Reset your system passwords to admin accounts using more sophisticated ones. Note that the infiltration can spread through shared folders. Type your old password, type your new password, type your new password again to confirm it, and then press ENTER. If you don't have an ESET product 3. Update your virus signature database. To verify that the stand-alone cleaner removed the Conficker threat, rerun the stand-alone cleaner and then run a scan with your ESET product.
After successfully running the ESET stand-alone cleaner, we recommend that you read the following Microsoft article for information about important security patches and recommended group changes:. For maximum protection against future threats, make sure your operating system is patched according to Microsoft's recommendations and that your ESET product is up to date.
Patches are not needed for Windows 7 and Server The patches below are not necessary for Windows 7 or Server r2, as the exploit used by Conficker does not exist on these operating systems. Last Updated: Mar 23, Was this information helpful?
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