How to remove the UltimateDefender virus

Most antivirus programs identify UltimateDefender.exe as malware—for example Symantec identifies it as UltimateDefender, and Kaspersky identifies it as Backdoor.Win32.UltimateDefender.hl.

The free file information forum can help you find out how to remove it. If you have additional information about this file, please leave a comment or a suggestion for other users.

Click to Run a Free Virus Scan for the UltimateDefender.exe malware

UltimateDefender.exe file information

The process known as Anti-Spyware Application belongs to software Ultimate Defender by Nous-Tech Solutions (

Description: UltimateDefender.exe is not essential for Windows and will often cause problems. The UltimateDefender.exe file is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 1,296,080 bytes (50% of all occurrences) or 1,304,272 bytes. 
The file is certified by a trustworthy company. The program is loaded during the Windows boot process (see Registry key: MACHINE\Run). UltimateDefender.exe is not a Windows system file. UltimateDefender.exe is able to record keyboard and mouse inputs and monitor applications. Therefore the technical security rating is 39% dangerous.

Uninstalling this variant: If you want to remove the program completely, go to Control Panel ⇒ Software ⇒ Ultimate Defender.

Recommended: Identify UltimateDefender.exe related errors

Important: You should check the UltimateDefender.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.


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Best practices for resolving UltimateDefender issues

The following programs have also been shown useful for a deeper analysis: Security Task Manager examines the active UltimateDefender process on your computer and clearly tells you what it is doing. Malwarebytes' well-known anti-malware tool tells you if the UltimateDefender.exe on your computer displays annoying ads, slowing it down. This type of unwanted adware program is not considered by some antivirus software to be a virus and is therefore not marked for cleanup.

A clean and tidy computer is the key requirement for avoiding PC trouble. 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.

Other processes

UltimateDefender.exe [all]