Posted: December 23, 2023
from Cybersecurity Glossary
PUABundler:Win32/FusionCore, PUA:Win32/FusionCore, Adware.FusionCore, PUP.Optional.FusionCore
Win32/FusionCore.BH, Bundler.FusionCore.CG, PUA.Win32.FusionCore.SMBD2
Browser Interference (Including Redirects), Ads Injected Into Web Pages, Frequent Pop-Ups, Exposure Of Personal Data, Installation Of Undesirable Software, Malware Infection
Risk Level:

FusionCore, functioning as an adware bundler, covertly introduces undesirable elements, including apps or browser extensions, to your system during software installation. These elements may introduce intrusive advertisements, including pop-ups, redirect web traffic, collect personal data, and disrupt online activities.

Possible symptoms

  • Unexpected and persistent browser redirects to unfamiliar websites.
  • Frequent appearance of intrusive advertisements, including pop-ups, on visited web pages.
  • Unwanted modifications to browser settings, such as changes to the default homepage or search engine.
  • Increased system resource usage and slower performance, particularly during online activities.
  • Unauthorized installation of additional software or browser extensions without user consent.

Sources of the infection

  • Software downloads from untrusted or unofficial sources, especially freeware or shareware platforms.
  • Compromised or malicious websites that host fake or misleading download links.
  • Infected email attachments and malicious links in phishing emails.
  • Exploitation of software vulnerabilities, especially outdated operating systems or applications.
  • Drive-by downloads from compromised websites, where the adware is bundled with seemingly harmless software.


FusionCore is an adware bundler known by various aliases such as PUABundler:Win32/FusionCore, PUA:Win32/FusionCore, Adware.FusionCore, and PUP.Optional.FusionCore. Operating as a covert entity, FusionCore strategically introduces unwanted components, including applications, into your system during software installations.

Functioning as an adware bundler, FusionCore surreptitiously incorporates undesirable elements, such as apps or browser extensions, into your system during software installation processes. These elements, once integrated, have the potential to disrupt your online activities in various ways.

The damage potential of FusionCore encompasses browser interference, including redirects, injected ads on web pages, frequent pop-ups, exposure of personal data, and the installation of undesirable software, possibly leading to broader malware infections.

FusionCore exhibits symptoms that include unexpected and persistent browser redirects, intrusive advertisements like pop-ups, unwanted modifications to browser settings, increased system resource usage, and unauthorized installations of additional software or browser extensions without user consent.

Several sources contribute to FusionCore infections, including downloads from untrusted sources, compromised websites hosting fake download links, infected email attachments, exploitation of software vulnerabilities, and drive-by downloads from compromised websites.

To address a suspected FusionCore infection, a user should take measures such as running a full system scan using Gridinsoft Anti-Malware, removing detected instances and associated files, resetting browser settings, and monitoring the system for unusual behavior.

For prevention, users are advised to download and install software only from trusted sources, keep their operating system and software up-to-date to patch vulnerabilities, use reliable antivirus or anti-malware solutions with real-time scanning, exercise caution when clicking on links or downloading files from unknown sources, and regularly backup important data to mitigate the impact of potential infections.

🤔 What to do?

If you suspect your system is infected with FusionCore, take the following steps:

  1. Run a full system scan using a Gridinsoft Anti-Malware.
  2. Remove any detected FusionCore instances and associated files.
  3. Reset your browser settings to default to eliminate any unwanted extensions or modifications.
  4. Monitor your system for any unusual behavior or persistent issues.

🛡️ Prevention

To prevent FusionCore infections, follow these technical measures:

  • Download and install software only from trusted sources.
  • Keep your operating system and all software up-to-date to patch potential vulnerabilities.
  • Use a reliable antivirus or anti-malware solution with real-time scanning capabilities.
  • Be cautious when clicking on links or downloading files from unknown sources.
  • Regularly backup your important data to mitigate the impact of potential infections.

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