PUP.Defender Pro

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Last updated:

Threat Scorecard

Popularity Rank: 14,988
Threat Level: 10 % (Normal)
Infected Computers: 19,013
First Seen: July 29, 2013
Last Seen: September 18, 2026
OS(es) Affected: Windows

The detection of PUP.Defender Pro on your system indicates the presence of a potentially unwanted program (PUP) that may be causing issues with your computer's performance and security. It's essential to understand the nature of this threat and take appropriate steps to remove it and prevent future infections.

What Is PUP.Defender Pro?

PUP.Defender Pro is a type of potentially unwanted program that may have been installed on your system without your knowledge or consent. PUPs are often bundled with other software or downloaded from the internet, and they can cause a range of problems, including slowing down your computer, displaying unwanted ads, and collecting your personal data. PUPs can also compromise your system's security, making it more vulnerable to other types of malware and cyber threats.

How PUP.Defender Pro Operates

PUP.Defender Pro, like other PUPs, operates by installing itself on your system and then executing its payload. This can include displaying fake alerts and warnings, scanning your system for non-existent threats, and offering to sell you fake or unnecessary security software. PUPs can also modify your system's settings and configuration, causing problems with your internet connection, browser, and other applications. In some cases, PUPs can also install additional malware or unwanted software on your system, further compromising its security and performance.

Symptoms of Infection

If your system is infected with PUP.Defender Pro, you may notice a range of symptoms, including slow system performance, unwanted ads and pop-ups, and fake alerts and warnings. You may also notice that your browser's homepage or search engine has been changed, or that you are being redirected to unwanted websites. In some cases, you may also experience problems with your system's security software, such as disabled antivirus or firewall protection. If you notice any of these symptoms, it's essential to take immediate action to remove the PUP and prevent further damage.

How to Remove PUP.Defender Pro

  1. Boot your system in Safe Mode with Networking to prevent the PUP from loading and to allow you to download and install removal tools.
  2. Download and install a reputable anti-malware tool, such as SpyHunter, and perform a full scan of your system to detect and remove the PUP and any associated malware.
  3. Uninstall any suspicious programs or software that you don't recognize or that you didn't intentionally install.
  4. Reset your browser settings to their default values, including Chrome, Firefox, and Edge, to remove any changes made by the PUP.
  5. Reboot your system and perform a follow-up scan with your anti-malware tool to ensure that the PUP has been completely removed and that your system is clean.

Conclusion

Removing PUP.Defender Pro from your system requires a combination of technical knowledge and the right tools. By following the steps outlined above, you can effectively remove the PUP and prevent future infections. It's also essential to take steps to prevent PUPs from being installed on your system in the first place, such as being cautious when downloading software from the internet, reading user agreements carefully, and avoiding suspicious or untrusted websites. By taking a proactive approach to system security, you can help protect your computer and your personal data from the threats posed by PUPs and other types of malware.

SpyHunter Detects & Remove PUP.Defender Pro

File System Details

PUP.Defender Pro may create the following file(s):
# File Name MD5 Detections
1. quickscan.exe bf4b85cb40735dce08a19379cc02bf12 18,362
2. trufos.sys b16d66a71de03285e14e9f165b59eda4 254
3. bdselfpr.sys 5eaf583c0b1cc2499761ea3b065f5db2 52