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Is rundll32.exe safe?

Rundll32.exe is a executable file (a program) within Windows. The filename extension .exe denotes an executable file. You should only run executable files from publishers you trust, because executable files can potentially change your computer settings or harm your computer. The free file information forum can help you determine if rundll32.exe is a virus, trojan, spyware, or adware that you can remove, or a file belonging to a Windows system or to an application you can trust.


Rundll32.exe file information

The process known as Run a DLL as an App or Windows host process (Rundll32) or Eine DLL-Datei als Anwendung ausführen or Een DLL-bestand als toepassing starten or Exécuter une DLL en tant qu'application or Ejecutar un archivo DLL como una aplicación or Uob or Windows værtsproces (Rundll32)

belongs to software Microsoft Windows Operating System or Betriebssystem Microsoft Windows or Besturingssysteem Microsoft Windows or Sistema operativo Microsoft Windows or Système d'exploitation Microsoft Windows or Microsoft Windows Operativsystem or Lsz or Microsoft DRM

by Microsoft (www.microsoft.com) or Ocf or judokas négligent or Simple Productions or skb or DODQKDZQR or Microsoft Windows Operating System (windows.microsoft.com) or url.

Description: The original rundll32.exe from Microsoft is an important part of Windows, but often causes problems. rundll32.exe is located in the folder C:\Windows\System32. Known file sizes on Windows 7/XP are 33,280 bytes (60% of all occurrences), 33,792 bytes and 49 more variants. http://www.file.net/process/rundll32.exe.html 
The file is a Microsoft signed file. Therefore the technical security rating is 6% dangerous, however also read the users reviews.

Recommended: Identify rundll32.exe related errors

Viruses with the same file name

Is rundll32.exe a virus? No, it is not. The true rundll32.exe file is a safe Microsoft Windows system process, called "Run a DLL as an App". However, writers of malware programs, such as viruses, worms, and trojans deliberately give their processes the same file name to escape detection. Viruses with the same file name are for instance TROJ_VB.CHK or PE_VIRUT.AV (detected by TrendMicro), and Mal/KeyGen-M (detected by Sophos).
To ensure that no rogue rundll32.exe is running on your PC, click here to run a Free Malware Scan.

How to recognize suspicious variants? If rundll32.exe is located in a subfolder of C:\Windows, the security rating is 24% dangerous. The file size is 44,544 bytes (70% of all occurrences), 34,816 bytes and 25 more variants. The program is not visible. Rundll32.exe is a trustworthy file from Microsoft.

If rundll32.exe is located in a subfolder of "C:\Documents and Settings", the security rating is 55% dangerous. The file size is 24,576 bytes (23% of all occurrences), 120,992 bytes and 12 more variants. The file is not a Windows core file. There is no description of the program. The application starts upon Windows startup (see Registry key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run, HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run, HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Runonce, HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce, HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Run, HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders, HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices, HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell, C:\Windows\win.ini, HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit, HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders). The program has no visible window. Rundll32.exe is able to record inputs.

If rundll32.exe is located in the folder C:\Windows, the security rating is 69% dangerous. The file size is 1,264,832 bytes (15% of all occurrences), 135,168 bytes and 13 more variants.

If rundll32.exe is located in a subfolder of "C:\Program Files", the security rating is 48% dangerous. The file size is 33,280 bytes (15% of all occurrences), 33,792 bytes and 8 more variants.

If rundll32.exe is located in the folder "C:\Program Files\Common Files", the security rating is 66% dangerous. The file size is 178,180 bytes (63% of all occurrences), 183,296 bytes or 187,904 bytes.

If rundll32.exe is located in a subfolder of C:\, the security rating is 60% dangerous. The file size is 61,440 bytes (60% of all occurrences), 44,544 bytes or 589,874 bytes.

If rundll32.exe is located in a subfolder of C:\Windows\System32, the security rating is 70% dangerous. The file size is 26,112 bytes (20% of all occurrences), 1,930,240 bytes, 376,851 bytes, 71,168 bytes or 256,512 bytes.

If rundll32.exe is located in a subfolder of Windows Temp folder, the security rating is 56% dangerous. The file size is 310,359 bytes.

If rundll32.exe is located in the Windows Temp folder, the security rating is 54% dangerous. The file size is 20,480 bytes.

If rundll32.exe is located in a subfolder of the "My Files" folder, the security rating is 56% dangerous. The file size is 7,168 bytes.

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

  • "BatInfEx" can run at start up. Displays battery status information on an IBM Thinkpad
  • "LoadPowerProfile" definitely not required. Added by the MIROOT WORM! Note - do not confuse with the valid LoadPowerProfile entry which has "powrprof.dll" appended to the command/data line
  • "Rundll32" definitely not required. Added by the DVLDR TROJAN! Note - this is not the valid "Rundll32.exe" as it's in the Windows\Fonts directory
  • "rundll32" definitely not required. Added by the SANKER WORM! Note that the valid "rundll32.exe" resides in C:\Windows\System32 wheras this version resides in C:\Windows
  • "TaskMan" definitely not required. Added by the DVLDR TROJAN! Note - this is not the valid "rundll32.exe" as it's in the Windows\Fonts directory
  • "UPDATEHOOK": ??
  • "Win32 Rundll Loader" definitely not required. Added by the SDBOT.A TROJAN! Note: Rundll32.exe is a valid Windows application called "Run a DLL as an App" and stored in the C:\Windows directory. The version created by this virus is saved in the C:\Windows\System directory
  • "Windows DLL Loader" definitely not required.

Important: Some malware disguises itself as rundll32.exe, particularly when not located in the C:\Windows\System32 folder. Therefore, you should check the rundll32.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.



Score

User Comments

The windows required rundll32.exe... But the hackers attack this file ..to crash the pc And the most of the virus and malware s written by hackers for attack this file... If you want to prevent this .. Make your pc is well secured antivirus..
  Rask in  
The file itself is not a virus, but there is a virus under the same name.
  Brii  
This is a valid Windows program used to run DLLs (hence the name). YES there are also viruses out there that use the same name, and YES viruses can exploit and screw with your rundll32.exe file, just as they can screw with any of your files, and YES sometimes you will have system or registry errors that cause it to not run properly... but the file itself is safe, valid, and necessary for certain functions. If you're having rundll32.exe problems, rundll is not the cause, unless you have a second illegitimate rundll32 file hiding on your system somewhere.
  mans  
Just leave it it will dont do any thing ..... Dont rename it or dont do any more .....
  diwan chowthry  
Multiple instances of RUNDLL32 may be running on your pc at one time. Some of these may or may not be the legitimate versions.
  SID JUSTICE  
Hit start type MRT (Malware Removal Tool). This is included in every Mircosoft Computer choose full scan and follow the steps. It is a good idea to do this in safe mode
  Simon  
run dll32.exe can be both harmful and neutral, what it is, is a execution program run by windows so that it can startup all the windows nonsense like explorer.exe, but some clever person from poland in 1980s found a way they could use this to run a selected program that they have planted on your computer, ie a virus downloaded from the internet because normally they would have to make there own executional file to start the virus process, but using the rundll32.exe was much better because it could use it as a way to mask itself and tricked antivirus software into thinking that it was windows opening the dll until Dr. Solomon created his Anti-Virus Tool-kit to remove them. if it appears in upper case letters then it will probably be some home made virus and i would consider removing it, ps, ANDREW - the *32 is normal it just means that you have a 32 bit computer, (how many bits of data your computer uses) but you don't need to know the technical stuff.
  Richard  
Don't touch or edit the file lets pretend it it is the you kill it you kill kernel32.dll = computer dies :( see your self
  Vincent Bartolo  
More comments can be found here:
    (further information)

Rating chart

Summary: Average user rating of rundll32.exe: based on 476 votes with 9 reviews.
167 users think rundll32.exe is essential for Windows or an installed application. 21 users think it's probably harmless. 120 users think it's neither essential nor dangerous. 70 users suspect danger. 98 users think rundll32.exe is dangerous and recommend removing it. 76 users don't grade rundll32.exe ("not sure about it").


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Rundll32 scanner


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