How to remove the Thunder Browser Helper malware

Most antivirus programs classify XunLeiBHO_001.dll as a harmful extension to Internet Explorer: such as not-a-virus:AdWare.Win32.BHO.ayv (detected by Kaspersky), and TSPY_BACKDOOR (detected by TrendMicro). Add-ons like this can display ads, slow down your computer and cause various other errors. If you can't remember installing the associated Thunder Browser Helper 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 Thunder Browser Helper and how to get rid of it.

Click here to automatically remove the Thunder Browser Helper malware

XunLeiBHO_001.dll file information

The process known as Thunder Browser Helper or XunLeiBHO appears to belong to software Thunder Browser Helper or e-BGI2 Agency System or XunLeiBHO Module by Thunder Networking Technologies,LTD (

Description: XunLeiBHO_001.dll is not essential for Windows and will often cause problems. The XunLeiBHO_001.dll file is located in the C:\Windows\System32 folder. Known file sizes on Windows 10/8/7/XP are 65,541 bytes (75% of all occurrences), 65,546 bytes or 65,551 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 889D2FEB-5411-4565-8998-1DD2C5261283 or 63B2D652-EAD9-4D6E-93ED-2CC51D22CF02. The program is not visible. It is an unknown file in the Windows folder. It is able to change the behavior of, or monitor Internet Explorer. The service has no detailed description. It is not a Windows system file. Therefore the technical security rating is 72% dangerous.

Recommended: Identify XunLeiBHO_001.dll related errors

If XunLeiBHO_001.dll is located in a subfolder of "C:\Program Files", the security rating is 62% dangerous. The file size is 49,152 bytes. The program has no visible window. The XunLeiBHO_001.dll file is able to change the behavior of, or monitor Internet Explorer. XunLeiBHO_001.dll is not a Windows core file. The service has no detailed description.

Uninstalling this variant: If you experience any issues with installation of XunLeiBHO_001.dll, you could also remove the entire program e-BGI2 Agency System or Thunder5 using Windows Control Panel.

Important: You should check the XunLeiBHO_001.dll process on your PC to see if it is a threat. If Thunder Browser Helper 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.


User Comments

There are no user opinions yet. Why not be the first to write a short comment?

Do you have additional information? Help other users!
What do you know about XunLeiBHO_001.dll:
How would you rate it:
Link for more info:
Your Name:

Best practices for resolving XunLeiBHO_001 issues

The following programs have also been shown useful for a deeper analysis: Security Task Manager examines the active XunLeiBHO_001 process on your computer and clearly tells you what it is doing. Malwarebytes' well-known anti-malware tool tells you if the XunLeiBHO_001.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

XunLeiBHO_001.dll [all]