What is rundl32.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 rundl32.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.

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Rundl32.exe file information

Windows Task Manager with rundl32
Rundl32.exe process in Windows Task Manager

The process known as OC Tuner or ffderysdadd appears to belong to software ASRock OC Tuner or std by ASRock or Microsoft (

Description: Rundl32.exe is not essential for the Windows OS and causes relatively few problems. The file rundl32.exe is located in a subfolder of C:\Windows\System32. The file size on Windows 10/8/7/XP is 101,038 bytes. 
There is no information about the author of the file. Rundl32.exe is located in the Windows folder, but it is not a Windows core file. The program has no visible window. Rundl32.exe is not a Windows system file. The software listens for or sends data on open ports to a LAN or the Internet. Therefore the technical security rating is 81% dangerous.

Recommended: Identify rundl32.exe related errors

Important: Some malware also uses the file name rundl32.exe, for example TROJ_GEN.R47CDBH (detected by TrendMicro), and Trojan-Dropper.Win32.Injector.hebh (detected by Kaspersky). Therefore, you should check the rundl32.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

One user thinks rundl32.exe is dangerous and recommends removing it.

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Best practices for resolving rundl32 issues

A clean and tidy computer is the key requirement for avoiding problems with rundl32. 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 rundl32.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

rundl32.exe [all]