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New Windows malware lays dormant until a custom command activates it like a sleeper agent
SLEEPWALKER is a newly discovered Windows malware implant that contains no malicious code, instead lying dormant until receiving a specially crafted network signal. Disguised as ESET's Management Agent, it evades security software entirely. Once activated, it can schedule tasks, communicate with remote systems, and execute code. Researcher Dominik Reichel believes it's likely a nation-state tool targeting specific victims, though no active campaigns or confirmed victims have been identified.
'This one just needs a script': Researchers find ultimate Windows kill switch which can disable antivirus with almost no user interaction
Researchers discovered a Windows vulnerability allowing attackers to disable antivirus software with minimal user interaction. Dubbed a near-universal "kill switch," the flaw could neutralize security tools across Windows systems. Microsoft addressed the issue in its April 2025 Patch Tuesday update. Additional fixes and mitigations are also available for users unable to apply the cumulative update immediately.
Microsoft's nemesis returns: Nightmare Eclipse is back with a new zero day which could be bad news for Windows users
A researcher known as Nightmare Eclipse has disclosed a new zero-day vulnerability in Windows, the tenth such release from this individual. The flaw was revealed shortly after Microsoft's Patch Tuesday update cycle, a pattern the researcher has repeated previously. The timing leaves Windows users potentially exposed before Microsoft can issue a fix.
Microsoft Patches a Record 570 Security Flaws
Microsoft released updates fixing 570 security flaws, nearly triple last month's record-breaking total. The company attributed the surge in vulnerability discoveries to artificial intelligence tools. The patches cover Windows operating systems and other Microsoft software.
A Record-Breaking Patch Tuesday for June 2026
Microsoft's June 2026 Patch Tuesday addressed nearly 200 security vulnerabilities across Windows and related software, the largest monthly update in the company's history. Around 30 of the flaws were rated critical, and exploit code for at least three vulnerabilities is already publicly available, raising the urgency for users and administrators to apply the patches promptly.