Windows Defender

Tech Optimizer
September 23, 2026
A new tool named BigDiskBuster has been released on GitHub, which disrupts Microsoft Defender Antivirus by preventing it from installing updates. It does this by consuming available disk space during the update process, causing Defender to remain on its current version and unable to receive new platform or signature updates. BigDiskBuster operates as a local denial-of-service technique and requires prior access to the target machine to execute. The tool was created by researcher Abdelhamid Naceri, known as Nightmare Eclipse, who has previously worked on similar projects. As of now, there is no CVE identifier, patch, or advisory from Microsoft regarding this issue.
Winsage
September 23, 2026
Security researcher Abdelhamid Naceri, known as Nightmare Eclipse, released a zero-day exploit called BigDiskBuster that targets Microsoft Defender, preventing antivirus updates and leaving systems vulnerable. BigDiskBuster operates across all supported Windows versions and must run in the background to block updates. Naceri has previously released a similar exploit called UnDefend and has a history of releasing multiple zero-day exploits since April 2026 amid a dispute with Microsoft. Two weeks before BigDiskBuster, he introduced another exploit named ShieldCrash, which grants SYSTEM access and circumvents a patched flaw. Naceri's recent exploits include tools like LegacyHive, BlueHammer, RedSun, YellowKey, GreenPlasma, and MiniPlasma, all targeting Microsoft Defender and other Windows components. Microsoft has warned of potential legal action against malicious activities but has not commented on BigDiskBuster.
Winsage
September 20, 2026
Microsoft resolved an issue in its Windows Security framework that incorrectly indicated Microsoft Defender Antivirus was disabled. This fix was implemented through Defender platform update 4.18.26080.4, released on September 17. The update installs automatically unless users have blocked mandatory security updates. Users had been receiving false alerts during system boot and intermittently afterward, which redirected them to the Windows Security home tab where settings appeared normal. Microsoft acknowledged the issue on August 28, affecting all supported versions of Windows and Windows Server with the latest Defender updates, but did not specify the triggering update. Users in the Windows Insider program reported similar warnings as early as June.
Tech Optimizer
September 19, 2026
For nearly two months, Windows 11 users received persistent notifications from the Windows Security app falsely indicating that Microsoft Defender was disabled, despite it functioning properly. This issue, which began in early August, has been addressed with a security update from Microsoft. The false alerts affected all versions of Windows 11, Windows Server, and Windows 10, and were linked to a bug introduced with a recent Defender security update. Microsoft confirmed that no manual action is required from users to resolve the issue, as the fix will be automatically deployed to all PCs with mandatory security updates enabled. The problem was resolved in the Microsoft Defender Antivirus update (version 4.18.26080.4), released on September 17, 2026. Users can verify the status of Defender by checking Windows Security or using a PowerShell command.
Tech Optimizer
September 15, 2026
Iranian state-sponsored hackers are targeting dissidents, activists, and journalists using deceptive tactics, including malicious applications that impersonate reputable cybersecurity products like Norton Antivirus and KeePass. The FBI and UK authorities issued a warning about these hackers, who establish rapport with targets via social messaging platforms, posing as IT support or known contacts. They convince victims to download files that appear authentic, including AI video creation applications and other software. The spyware, named “Chosen Brick,” infects Windows PCs and has capabilities such as capturing screen content, recording audio, collecting message data, and downloading additional malware. The hackers have exploited this spyware to publish personal details of victims, increasing their harassment. The FBI advises potential victims on detecting the spyware and recommends enabling antivirus software, running regular scans, and avoiding unofficial downloads.
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