MuddyWater Uses Microsoft Teams to Steal Credentials in False Flag Ransomware Attack

MuddyWater, an Iranian state-sponsored hacking group, has been linked to a ransomware attack that utilizes Microsoft Teams as a vector for stealing credentials. The attack, detected by Rapid7 in early 2026, employs social engineering tactics to initiate the infection sequence, marking a notable example of a "false flag" operation. By exploiting Microsoft Teams, the attackers aim to gain unauthorized access to sensitive information. The use of this tactic highlights the vulnerability of popular collaboration tools to cyber threats. The incident demonstrates the group's ability to adapt and evolve its techniques, posing a significant risk to organizations relying on Microsoft services. This attack matters to security practitioners because it underscores the importance of operational resilience planning in mitigating sector-specific risks, particularly those associated with widely used software like Microsoft Teams¹.