Windows Defender

Tech Optimizer
May 29, 2025
Antivirus software is crucial for digital security, providing protection against malware threats. Users may need to disable antivirus temporarily for reasons such as system resource consumption, particularly during resource-intensive tasks like gaming, or to bypass false positives when installing applications. Disabling antivirus software poses risks, especially when browsing the internet, as even legitimate sites can be compromised. Precautions to take when disabling antivirus include disconnecting from the internet, avoiding USB drives, using trusted networks, closing non-essential applications, verifying the legitimacy of downloaded files, and limiting browsing to secure websites. Users should promptly re-enable their antivirus after completing necessary tasks.
Winsage
May 24, 2025
This month's KB5058497 update for Windows 11 24H2 introduces the first 'hotpatch' update, allowing installation without a reboot, but it is only available for Windows 11 24H2 Enterprise users. There is no timeline for extending this feature to Pro and Home users. To use hotpatch updates, users must have a Microsoft subscription that includes Windows 11 Enterprise E3, E5, or F3, Windows 11 Education A3 or A5, or a Windows 365 Enterprise subscription, along with devices running Windows 11 Enterprise version 24H2 (Build 26100.2033 or later), an x64 CPU, Microsoft Intune for deployment management, and Virtualization-based Security (VBS) enabled. Users of Windows 11 24H2 or older versions must reboot their systems to apply new security updates, except for specific patches for Windows Defender, while every third update will still require a reboot. KB5058497 is scheduled to be released between May and June 2025 during the 'no restart' period, and it has been reported to install seamlessly without prompting for a reboot. Users of Windows 11 Home and Pro still face the traditional monthly reboot requirement for updates.
Winsage
May 23, 2025
A new tool called Defendnot can disable Windows Defender by masquerading as a legitimate antivirus program, exploiting a feature of Windows that allows only one antivirus solution to operate at a time. When Defendnot is installed, Windows automatically disables Defender, leaving systems vulnerable to cyber threats.
Winsage
May 22, 2025
A new tool called Defendnot can disable Windows Defender by masquerading as another antivirus program, exploiting a limitation of the Windows operating system that prevents multiple antivirus solutions from running simultaneously. When Defendnot is installed, Windows automatically disables Defender, leaving systems vulnerable. Cybersecurity experts recommend using robust antivirus solutions like TotalAV for additional security.
Tech Optimizer
May 21, 2025
A newly developed security program called Defendnot can deceive and disable Windows Defender, even without legitimate antivirus software installed. It alters the system to appear as a genuine antivirus program, allowing hackers to neutralize Windows Defender's protective measures. Defendnot operates through an undocumented API that antivirus software uses to register with the Windows Security Center, causing Microsoft Defender to deactivate. Developed by security researcher es3n1n, Defendnot injects a DLL file into the Taskmgr.exe process, misleading Windows into believing an antivirus is present. Although created for research purposes, it can be misused by cybercriminals. Microsoft Defender recognizes Defendnot as a Trojan and quarantines it upon detection.
Tech Optimizer
May 19, 2025
A researcher using the pseudonym es3n1n has created a tool called Defendnot that manipulates Windows operating systems to disable Microsoft Defender, making devices vulnerable to malware. Defendnot simulates the presence of a legitimate antivirus by using an undocumented API in the Windows Security Center, convincing Windows that a valid antivirus is installed. This development raises concerns about cybersecurity, as it undermines the effectiveness of built-in antivirus protections like Windows Defender.
Tech Optimizer
May 19, 2025
A security researcher known as es3n1n has developed a program called Defendnot, which disguises itself as an antivirus application and exploits a previously undocumented Windows Security Center (WSC) API. Defendnot registers itself as a legitimate antivirus, causing Windows Defender to disable itself when it detects another antivirus, leaving users vulnerable. Microsoft has responded by enabling Defender to detect and quarantine Defendnot as 'Win32/Sabsik.FL.!ml'. This is not the first version of such a program; a previous iteration was removed due to copyright infringement.
Tech Optimizer
May 19, 2025
A researcher known as es3n1n explored Windows security mechanisms to bypass antivirus software validation checks in the Windows Security Center (WSC). He used tools like dnSpy and Process Monitor to analyze how legitimate antivirus solutions register with WSC. He confirmed that WSC validates the signatures of processes calling its APIs. Previously, es3n1n faced controversy when his project, no-defender, was removed from GitHub due to a DMCA takedown request from a software vendor.
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