How to remove the catsrvu.dll malware

Most antivirus programs classify catsrvu.dll as a harmful extension to Internet Explorer: for example Trojan.Adclicker (detected by Symantec), and Trojan:Win32/Boaxxe.C (detected by Microsoft). Add-ons like this can display ads, slow down your computer and cause various other errors. If you can't remember installing the associated catsrvu.dll software, it's no surprise. In most cases, this kind of adware is installed on the side when you install a freeware product like a Youtube Downloader or a PDF Converter. In the following selection, you can read more about catsrvu.dll and how to get rid of it.

Click here to automatically remove the catsrvu.dll malware

Catsrvu.dll file information

catsrvu.dll does not provide any particulars about the software with which the process was installed, nor is the developer identified within the file.

Description: Catsrvu.dll is not essential for Windows and will often cause problems. Catsrvu.dll is located in the C:\Windows\System32 folder. Known file sizes on Windows 10/8/7/XP are 83,456 bytes (33% of all occurrences), 84,992 bytes, 113,664 bytes or 95,744 bytes. 
This .dll file is a Browser Helper Object (BHO) that runs automatically every time you start your web browser. BHOs are not stopped by personal firewalls, because they are identified by the firewall as part of the browser itself. BHOs are often used by adware and spyware. IDs used by this BHO include BDDAD573-3CB7-4231-B313-91C4577C11B9 or D7696756-90FF-4DD8-A8A9-6173ED97A551 or 5 more variants. There is no information about the author of the file. The file is an unknown file in the Windows folder. The program is not visible. The catsrvu.dll file is able to monitor web browsers. The service has no detailed description. Catsrvu.dll is not a Windows system file. Therefore the technical security rating is 92% dangerous.

Recommended: Identify catsrvu.dll related errors

Important: You should check the catsrvu.dll process on your PC to see if it is a threat. If catsrvu.dll has changed your browser's search engine and start page, you can recover your browser's default settings as follows:

Reset default browser settings for Internet-Explorer ▾
  1. In Internet Explorer, press the key combination Alt + X to open the Tools menu.
  2. Click Internet options.
  3. Click the Advanced tab.
  4. Click the Reset... button.
  5. Enable the Delete personal settings option.
This will reset your Internet Explorer to its default settings. Your browser will start with the familiar start page and search engine—without popups, ads, cookies, but all browser add-ons are deleted too [1]. Make cleaning up your browser and your computer simpler and safer with Security Task Manager.


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Best practices for resolving catsrvu issues

The following programs have also been shown useful for a deeper analysis: Security Task Manager examines the active catsrvu process on your computer and clearly tells you what it is doing. Malwarebytes' well-known anti-malware tool tells you if the catsrvu.dll on your computer displays annoying ads, slowing it down. This type of unwanted adware program is not considered by some antivirus software to be a virus and is therefore not marked for cleanup.

A clean and tidy computer is the key requirement for avoiding PC trouble. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

Other processes

catsrvu.dll [all]