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Microsoft Thwarts Ransomware Attack on Teams Users

October 17, 2025

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Microsoft Thwarts Ransomware Attack on Teams Users

Microsoft invalidated over 200 fraudulent digital certificates to disrupt a ransomware campaign that used fake Teams installers, blocking the Rhysida ransomware's distribution network in early October. The attack, orchestrated by the Vanilla Tempest group, involved malvertising and spoofed websit...

Microsoft Nukes 200+ Fake Certificates in Teams Malware Attack

Microsoft revoked over 200 fraudulent certificates used by cybercriminals to distribute malware via fake Microsoft Teams installation files, a campaign linked to the Vanilla Tempest group. The attackers employed SEO poisoning and malvertising to trick users into downloading malicious files, which...

eScan Server Breach Delivers Malicious Software Update

eScan antivirus software experienced a supply chain attack where a compromised regional update server distributed a malicious file to a limited number of customers during a specific window in January 2026. The malicious update delivered a tampered component that established persistence, executed ...