#antivirus


New Windows Defender zero-day blocks Microsoft antivirus updates

Sep 22, 2026 // 13:17

Over the weekend, security researcher Abdelhamid Naceri (also known as Nightmare Eclipse) released another Microsoft Defender zero-day exploit that blocks antivirus updates. Naceri named it BigDiskBuster […]

Fake LastPass Authenticator Installer Abuses Microsoft-Signed Driver to Kill Antivirus and EDR

Sep 22, 2026 // 00:12

A fake LastPass Authenticator installer offered on GitHub installs a Windows kernel driver that shuts off antivirus and other security software before a password stealer […]

Microsoft fixes bug behind ‘Defender Antivirus is turned off’ alerts

Sep 19, 2026 // 00:02

Microsoft has resolved a known issue that causes incorrect alerts warning that Defender Antivirus was turned off after installing recent updates. In a Windows release […]

ValleyRAT Backdoor Hides in Signed Adware That Users Add to Antivirus Exclusions

Aug 31, 2026 // 20:53

The threat actor known as Silver Fox has been observed distributing the ValleyRAT backdoor disguised as a signed Chinese adware application, running the malware under […]