Hackers have been spotted using SEO poisoning and search engine advertisements to promote fake Microsoft Teams installers that infect Windows devices with the Oyster backdoor, providing initial access ...

Fake Teams site delivers Oyster malware via SEO poisoning and deceptive ads Spoofed page mimics Microsoft’s design, tricking users into downloading malware Best defense: type known URLs directly, ...

Microsoft has disrupted a wave of Rhysida ransomware attacks in early October by revoking over 200 certificates used to sign malicious Teams installers. Vanilla Tempest, the threat group behind the ...

Microsoft Threat Intelligence has revoked over 200 certificates fraudulently signed by a threat actor and used in fake MS Teams set-up files to deliver a backdoor and malware. The campaign, dubbed ...