What Does the Program Rundll32 Do?
The RunDLL32.exe program is an integral part of the Windows operating system and should not be removed or turned off.
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DLL
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DLL, or Dynamic Linked Libraries, is a tool used by Windows developers to add features to their programs. The RunDLL32.exe program is the Windows operating system command that allows them to use the features provided by a DLL in their own programs.
Dangers
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Since RunDLL32.exe is such an important part of the Windows operating system, many virus, trojan and spyware programs attempt to impersonate the rundll32.exe program to evade detection. A valid Rundll32.exe program should be located in the folder C:\Windows\System32. If you believe there is a fake version of rundll32 running on your computer, you may need to purchase a quality antivirus program.
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Impersonation Methods
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One trick used by viruses to impersonate the rundll32 program is to create a file that, on casual inspection, appears the same. For example, some viruses use names like "rundII32," replacing the lower case "L" with a similar looking capital "I."
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