Fake IT Support Used by Ransomware Gangs in Microsoft Teams Breaches

The Sophos security team has identified two ransomware campaigns that are utilizing Microsoft Teams to steal data from organizations, and the crooks may be allied with Black Basta and FIN7. In the X-Ops Managed Detection and Response (MDR) service, Sophos X-Ops responds to incidents related to two different groups of threat actors. In each case, the attackers gained access to targeted organizations by using the Microsoft Office 365 platform to steal data and deploy ransomware to steal data. 

This pair of separate clusters of activity were investigated by Sophos MDR in November and December 2024 as a result of customer reports, and the threat is tracked as STAC5143 and STAC5777, respectively. The two groups are utilizing Microsoft Office 365 services, including Teams and Outlook, to gain access to victim organizations, according to Sophos, who has observed over 15 incidents in just the past two weeks, the majority of which took place between November and December 2024. 

According to Sophos, the attackers took advantage of a Microsoft Teams configuration that allows users from external domains to initiate chats or meetings with internal users, thereby taking advantage of a default configuration, he warned. As a result of threat actors exploiting Microsoft Teams to pose as tech support personnel, attackers gain initial access to victim organizations by using the platform, and their goal is to steal data and deploy ransomware, accordi

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