Attackers exploiting bugs in the “link preview” feature in Microsoft Teams could abuse the flaws to spoof links, leak an Android user’s IP address and launch a DoS attack.
https://threatpost.com/microsoft-teams-bugs-vulnerable-march/177225/
‘Karakurt’ Extortion Threat Emerges, But Says No to Ransomware
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The threat group, first identified in June, focuses solely on data exfiltration and subsequent extortion, and has already targeted 40 victims since September.
https://threatpost.com/extortion-karakurt-threat-ransomware/176911/