What is runner.exe?

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the runner.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

Click to Run a Free Scan for runner.exe related errors

Runner.exe file information

Windows Task Manager with runner
Runner.exe process in Windows Task Manager

The process known as MasterAgent or WebStroller runner module

belongs to software Idle Crawler or OverLook or Web Stroller or MasterAgent or The Kinemorphic (version 3D Screen Saver)


Description: Runner.exe is not essential for the Windows OS and causes relatively few problems. Runner.exe is located in a subfolder of the user's profile folder. Known file sizes on Windows 10/8/7/XP are 392,768 bytes (25% of all occurrences), 39,512 bytes and 11 more variants. 
The file is not a Windows system file. The program has no file description. The program has no visible window. The runner.exe file is digitally signed. Runner.exe is able to monitor applications. Therefore the technical security rating is 57% dangerous, however you should also read the user reviews.

Uninstalling this variant: If problems with Idle Crawler or OverLook come up, you can remove the entire program using Windows Control Panel or turn to the software developer [1][2], Idlecrawler, for advice.

Recommended: Identify runner.exe related errors

Important: Some malware camouflages itself as runner.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder, for example Adware.IdleCrawler.E (detected by F-Secure), and Win32:Malware-gen (detected by Avast). Therefore, you should check the runner.exe process on your PC to see if it is a threat. If MasterAgent 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

Runner.exe gehört zu FitSharp, einer .NET Implementierung des Testframeworks FIT:
  Christian Baumann   (further information)
It's a genuine process which runs when you execute the tool called Websecurify Scanner
  Vinoth Kumar   (further information)
Great for school computers which blocks .exe files. A way to get around security features and play games at school by converting .exe files into .jar
  Gordon Wu  

Summary: Average user rating of runner.exe: based on 3 votes with 3 user comments. One user thinks runner.exe is essential for Windows or an installed application. One user thinks it's probably harmless. One user thinks it's neither essential nor dangerous.

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Best practices for resolving runner issues

A clean and tidy computer is the key requirement for avoiding problems with runner. 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.

To help you analyze the runner.exe process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

runner.exe [all]