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 bitcoin-miner or padFecVgm

belongs to software Generic Host Process for Win32 Services or UnJapan or PTTmMBmbvAhSe or Bitcoin Miner

by Microsoft ( or bit 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 10/8/7/XP are 40,960 bytes (28% of all occurrences), 164,864 bytes, 59,900 bytes, 430,080 bytes or 384,000 bytes. 
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: MACHINE\Run, Winlogon\Shell, Run, User Shell Folders). Rundll.exe is able to monitor applications, hide itself, manipulate other programs and record keyboard and mouse inputs. Therefore the technical security rating is 71% 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 TROJ_SPNR.11HT12 or TROJ_BUZUS.AGS (detected by TrendMicro), and Trojan.Generic.1174251 or Trojan.Generic.KDV.686890 (detected by BitDefender). 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  
c:\Program Files (x86) Music Toolbar\Dalamng\ apcrtldr.dll

Rating chart

Summary: Average user rating of rundll.exe: based on 18 votes with 8 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. 8 users think rundll.exe is dangerous and recommend removing it. 2 users don't grade rundll.exe ("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 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic 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 6resmon 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 7DISM.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: ASecurity 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. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

rundll.exe [all]