What is MSASN1.dll?

The genuine MSASN1.dll file is a software component of Microsoft Windows by Microsoft.
Microsoft Windows is an operating system; a piece of software that acts as a bridge between the hardware and software counterparts of a computer. MSASN1.dll is a resource library that is part of ASN.1, an interface description language broadly used in crpytography. This is a critical Windows component and should not be disabled or removed.

The Microsoft Windows operating system exhibits a graphical user interface and made its first appearance in November, 1985. It was developed using a GUI system shell for MS-DOS to target the growing market for graphical user interfaces. Microsoft Windows eventually took over the market with a 90% share, taking over large competitors such as Apple. It is currently available in over 137 languages.

Microsoft, founded by Bill Gates and Paul Allen in 1975, is the world's largest software maker with respect to revenue. Microsoft is best known for the Windows operating system. The company quickly rose to fame and fortune following the success of its 1986 public share offering turning three people into billionaires and an estimated 12,000 Microsoft employees into millionaires. Microsoft is headquartered in Redmond, Washington, USA.

MsASN1 stands for Microsoft Abstract Syntax Notation One

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.

Click to Run a Free Scan for MSASN1.dll related errors

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—usually C:\Windows\syswow64\. Known file sizes on Windows 10/8/7/XP are 34,304 bytes (96% 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 39% dangerous.

Recommended: Identify MSASN1.dll related errors

If MSASN1.dll is located in the C:\Windows\System32 folder, the security rating is 38% dangerous. The file size is 34,304 bytes (60% of all occurrences), 57,344 bytes, 34,816 bytes, 50,616 bytes or 51,608 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.

Uninstalling this variant: If you have any problems with MSASN1.dll, you can uninstall Microsoft Windows from your computer using the Control Panel applet Uninstall a Program or ask the developer,, for support.

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.


User Comments

There are no user opinions yet. Why not be the first to write a short comment?

Do you have additional information? Help other users!

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 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 MSASN1.dll 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

MSASN1.dll [all]