Social Engineering Attack via Microsoft Teams Deploys A0Backdoor Malware

Social Engineering Attack via Microsoft Teams Deploys A0Backdoor Malware

First seen 10 Mar 2026, 03:10 UTC •BleepingcomputerCybersecuritynewsGbhackersPetriTechradar+5 •80% similarity •54.8

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ThreatCluster

Hackers are targeting employees in financial and healthcare sectors through Microsoft Teams, using social engineering tactics to gain remote access via Windows Quick Assist. The attackers deploy a new malware family called A0Backdoor after convincing employees they are IT staff assisting with spam messages. This campaign is linked to the financially motivated group Blitz Brigantine.

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Timeline

2026-03-09
Bleepingcomputer reports on Microsoft Teams phishing campaign
2026-03-10
Cybersecuritynews reports on A0Backdoor malware deployment

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Tracked Entities in This Story

Blitz Brigantine Storm-1811 Black Basta BlackBasta A0Backdoor Teams Social Engineering Campaign Phone Link Windows Financial Healthcare Malware Phishing Microsoft Teams CrossDeviceService Quick Assist Windows Quick Assist