What is rundll.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 rundll.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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Rundll.exe file information

Windows Task Manager with rundll
Rundll.exe process in Windows Task Manager

The process known as Generic Host Process for Win32 Services or Run a DLL as an App or bitcoin-miner or Windows Security System or padFecVgm

belongs to software Microsoft® Windows (version 2000 Operating System) or Windows Update or Generic Host Process for Win32 Services or UnJapan or rundll32 or WSS or Microsoft Windows Operating System or PTTmMBmbvAhSe

by Microsoft ( or bit or Microsoft Co ( or GoHacking.INC or Ufasoft (

Description: Rundll.exe is not essential for Windows and will often cause problems. Rundll.exe is located in the C:\Windows\System32 folder. Known file sizes on Windows 8/7/XP are 1,245,190 bytes (16% of all occurrences), 12,272 bytes and 16 more variants. 
The rundll.exe file is not a Windows core file. The program is not visible. There is no information about the author of the file. The rundll.exe file is an unknown file in the Windows folder. The software starts upon Windows startup (see Registry key: Run, MACHINE\Run, Winlogon\Shell, MACHINE\RunServices, DEFAULT\Run, DEFAULT\Runonce, User Shell Folders). The software uses ports to connect to or from a LAN or the Internet. Rundll.exe is able to monitor applications, record keyboard and mouse inputs and hide itself. Therefore the technical security rating is 77% dangerous, however you should also read the user reviews.

Recommended: Identify rundll.exe related errors

External information from Paul Collins:
There are different files with the same name:

Important: Some malware also uses the file name rundll.exe, for example not-a-virus:Monitor.Win32.007SpySoft.g or (detected by Kaspersky), and Win32:Haxpa (detected by Avast). Therefore, you should check the rundll.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

when I signed up from 1 to another account, a window poped up asking me if i wanted to remember keystrokes...
  Joost Meulemeesters  
on XP is a trojan
I removed rundll.exe and now I cant use add/remove programs or security alerts
Wichtige systemdatei
  Shoop da Whoop  
my pc window need his
  romeo bara  
it is affecting my computer
use msconfig to stop all rundll.exe files from starting at startup. If the are in the startup list they are not the good rundll.exe but a virus like copy of it. When rundll.exe is listed in a microsoft explorer window there should be an application icon with it. If it shows a page icon it is a virus.
  Gary Click  

Rating chart

Summary: Average user rating of rundll.exe: based on 17 votes with 7 user comments. 8 users think rundll.exe is essential for Windows or an installed application. One user thinks it's probably harmless. One user suspects danger. 7 users think rundll.exe is dangerous and recommend removing it. One user is not sure about it.

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Best practices for resolving rundll issues

A clean and tidy computer is the key requirement for avoiding problems with rundll. 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 doing a repair of your installation, or in the case of Windows 8, 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 rundll.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

rundll.exe [all]