Hackers use Weaponized Microsoft Teams Installer to Compromise Systems With Oyster Malware

A sophisticated malvertising campaign is using fake Microsoft Teams installers to compromise corporate systems, leveraging poisoned search engine results and abused code-signing certificates to deliver the Oyster backdoor malware. The attack was neutralized by Microsoft Defender’s Attack Surface Reduction (ASR) rules, which blocked the malware from establishing contact with its command-and-control server. The multi-stage attack […]

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