What does the QHActiveDefense.exe file do?
The QHActiveDefense.exe process is also known as 360 Total Security and is a part of 360 Total Security or, as the case may be, 360 Security Center. This software is produced by Qihoo 360 Technology Co. or, as the case may be, QIHU 360 SOFTWARE CO. LIMITED. An outdated or faulty version of QHActiveDefense.exe can cause problems for your computer, ranging from slowness to error messages like these:
- 360 Total Security has stopped working. Windows is checking for a solution to the problem... (Windows 11, 10, 7)
- 360 Total Security has stopped working. A problem caused the program to stop working correctly. Windows will close the program and notify you if a solution is available. (Windows 11, 10, 7)
- QHActiveDefense.exe has encountered a problem and needs to close.
- Access violation at address FFFFFFFF in module QHActiveDefense.exe. Read of address 00000000.
Free PC Check
Take advantage of our free computer check to identify problems with QHActiveDefense.exe
Scan your computer for free with the Windows Repair Tool. This tool repairs Windows and improves its performance. Scans are free. A premium version is available for purchase.
What you should know about QHActiveDefense.exe 360 Total Security
QHActiveDefense.exe is not part of Windows, but it is important nonetheless. The file QHActiveDefense.exe is found in a subdirectory of "C:\Program Files".
Frequently occurring are file sizes such as 1,097,792 bytes (11% of all these files), 960,576 bytes as well as 12 other variants.
It is the QHActiveDefense service: 360 Total Security.
The program executes in the background, and can only be terminated using Windows Task Manager. It is no part of Microsoft Windows. The original file has a digital certificate (see its file properties). The application is receiving or sending data on the LAN (your local network) or on the Internet. The file possesses a digital signature from Verisign.com, which should confirm its trustworthiness.
QHActiveDefense.exe is capable of monitor other applications.
For this reason, 23% of all experts consider this file to be a possible threat. The probability that it can cause harm is high.
A QHActiveDefense.exe file has a 46% certainty of being dangerous if it is found in a subdirectory of "C:\Users\USERNAME". In this case, the file size is usually 965,472 bytes. This QHActiveDefense program is receiving or sending data on the LAN (your local network) or on the Internet. The original file has a digital certificate (see its file properties). This file contains a digital signature from Verisign, a subsidiary of Symantec. Verisign thereby confirms this file's authenticity and integrity. It was developed by a so-called third party provider - and not by Microsoft. The program executes in the background, and can only be terminated using Windows Task Manager. QHActiveDefense.exe is capable of monitor other applications.
If you see this file on your hard drive or in Windows Task Manager, please make sure that it is not a malicious variant. It's a fact that many trojans try to cloak their true identity by calling themselves QHActiveDefense.exe. With the above information or by using tools like Security Task Manager you can determine if, in your case, the file is an undesirable variant.
What do other computer users say about QHActiveDefense?
The file spreads very slowly and does not often make an appearance. Therefore, feedback from other users is not yet available.
Summary: source: file.net
How to uninstall 360 Total Security or 360 Security Center
To remove 360 Total Security from your computer, please follow the manual instructions below.
- Click the Windows Start Button. You can find it in the lower-left corner of the taskbar.
- Type 'uninstall'.
- Click Add or remove programs.
- Now locate 360 Total Security or 360 Security Center in the list of displayed applications.
- Click the program, and then click Uninstall.


How to check if QHActiveDefense.exe (360 Total Security) was uninstalled completely
After uninstalling, restart your computer. Then open Windows Explorer and check if a folder with the software name still exists under C:\Program Files. Also, check the Registry for remnants of 360 Total Security. To do this, start Regedit, then look under HKEY_LOCAL_MACHINE > Software for: 360 Total Security or the name of the producer. Keep in mind that only a computer professional should delete entries in the Windows Registry directly.
Last but not least
If Windows is not working properly, startup is slow, or QHActiveDefense.exe is causing problems, a good Windows diagnostic tool may help. This is especially effective when it comes to older computers that have accumulated vast quantities of "garbage data" as the result of many software installs and uninstalls.
Users interested in QHActiveDefense.exe have also searched for: fdisppos.exe sw_d.exe essvr.exe QHActiveDefense.exe cmtray.exe maps.exe vspdfprsrv.exe overlayiconshlext1.dll [index]