What is a2service.exe?

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the a2service.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

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A2service.exe file information

Windows Task Manager with a2service
A2service.exe process in Windows Task Manager

The process known as Emsisoft Anti-Malware Service or a-squared Service or Emsisoft Protection Service

belongs to software Emsisoft Anti-Malware or a-squared Free or a-squared or a-squared Anti-Malware or a-squared Free Service

by Emsisoft GmbH or Emsi Software GmbH ( or Emsisoft (

Description: A2service.exe is not essential for the Windows OS and causes relatively few problems. The a2service.exe file is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 1,858,144 bytes (5% of all occurrences), 4,163,584 bytes and 70 more variants. 
The program is not visible. A2service.exe is digitally signed. The file is not a Windows core file. It can change the behavior of other programs or manipulate other programs. A2service.exe is able to record keyboard and mouse inputs, monitor applications, connect to the Internet and manipulate other programs. Therefore the technical security rating is 38% dangerous, however you should also read the user reviews.

Uninstalling this variant: There is a possibility to consult Emsisoft’s Customer Service [1][2], see if there is a newer version or safely remove the program using the uninstall program of Emsisoft Anti-Malware or a-squared Free (Control Panel ⇒ Uninstall a Program).

Recommended: Identify a2service.exe related errors

If a2service.exe is located in a subfolder of the user's profile folder, the security rating is 22% dangerous. The file size is 419,448 bytes (50% of all occurrences), 380,536 bytes or 421,496 bytes. The program is not visible. A2service.exe is a Verisign signed file. The a2service.exe file is certified by a trustworthy company. The a2service.exe file is not a Windows core file. A2service.exe is able to record keyboard and mouse inputs and monitor applications.

Important: Some malware camouflages itself as a2service.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the a2service.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.


User Comments

a-squared Command Line Scanner. a-squared Anti-Malware
  Schlaukopf   (further information)
asquared anti spyward part of driver no dangerous
Emsisoft Anti-Malware driver
  mee   (further information)
Emsisoft Anti-Malware background shield
  metoo   (further information)
Emsisoft Mamutu service, Mamutu prevents from running malicious software
  meetoo   (further information)
Emsisoft anti-malware
Emisoft Anti-Malware Servicedienst

Rating chart

Summary: Average user rating of a2service.exe: based on 13 votes with 7 user comments. 9 users think a2service.exe is essential for Windows or an installed application. 3 users think it's probably harmless. One user thinks a2service.exe is dangerous and recommends removing it.

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Best practices for resolving a2service issues

A clean and tidy computer is the key requirement for avoiding problems with a2service. 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 a2service.exe 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

a2service.exe [all]