Rundll32.exe

Rundll32.exe

Dynamic-link library (also written without the hyphen), or DLL, is Microsoft's implementation of the shared library concept in the Microsoft Windows and OS/2 operating systems. These libraries usually have the file extension DLL, OCX (for libraries containing ActiveX controls), or DRV (for legacy system drivers).

The file formats for DLLs are the same as for Windows EXE files — that is, Portable Executable (PE) for 32-bit Windows, and New Executable (NE) for 16-bit Windows. As with EXEs, DLLs can contain code, data, and resources, in any combination.

In the broader sense of the term, any data file with the same file format can be called a resource DLL. Examples of such DLLs include icon libraries, sometimes having the extension ICL, and font files, having the extensions FON and FOT.

The rundll32.exe is a process which executes DLL's and places their libraries into the memory, so they can be used more efficiently by applications. This program is important for the stable and secure running of your computer and should not be terminated.

rundll32.exe is also a process registered as a backdoor vulnerability which may be installed for malicious purposes by an attacker allowing access to your computer from remote locations, stealing passwords, Internet banking and personal data. This process is a security risk and should be removed from your system.

The rundll32.exe file is located in the folder C:\Windows\System32. In other cases, rundll32.exe is most likely some type of malware: spyware, adware, virus or a worm!