What is MSASN1.dll?

MSASN1.dll is a Windows DLL file. DLL is the abbreviation for Dynamic Link Library. DLL files are needed by programs or web browser extensions, because they contain program code, data, and resources. You can fix your MSASN1.dll problem by downloading the correct MSASN1.dll file. The following information can help you determine if MSASN1.dll is a Windows system file or if it belongs to an application that you can trust.

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MSASN1.dll file information

The process known as ASN.1 Runtime APIs belongs to software Microsoft Windows Operating System by Microsoft (

Description: MSASN1.dll is not essential for the Windows OS and causes relatively few problems. MSASN1.dll is located in a subfolder of C:\Windows. Known file sizes on Windows 10/8/7/XP are 34,304 bytes (95% of all occurrences) or 34,816 bytes. 
A .dll file (Dynamic Link Library) is a special type of Windows program containing functions that other programs can call. This .dll file can be injected to all running processes and can change or manipulate their behavior. It can change the behavior of other programs or manipulate other programs. The program has no visible window. The service has no detailed description. MSASN1.dll is not a Windows system file. MSASN1.dll is a Microsoft signed file. MSASN1.dll appears to be a compressed file. Therefore the technical security rating is 40% dangerous.

Recommended: Identify MSASN1.dll related errors

If MSASN1.dll is located in the C:\Windows\System32 folder, the security rating is 40% dangerous. The file size is 34,304 bytes (66% of all occurrences), 34,816 bytes, 57,344 bytes or 59,904 bytes. It is a Microsoft signed file. It can change the behavior of other programs or manipulate other programs. The program is not visible. There is no detailed description of this service. The file is not a Windows core file. MSASN1.dll appears to be a compressed file.

Important: Some malware camouflages itself as MSASN1.dll, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the MSASN1.dll 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.


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Best practices for resolving MSASN1 issues

A clean and tidy computer is the key requirement for avoiding problems with MSASN1. 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 repairing of your installation or, for Windows 8 and later versions, 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 MSASN1.dll 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

MSASN1.dll [all]