Analytics Low
✕

Possible multistage attack in Microsoft Teams

Possible multistage attack in Microsoft Teams.

Module:
Identity Threat Detection (ITDR)
Licensed by:
Identity Threat Detection (ITDR)
Data source:
Office 365 Audit
ATT&CK tactics: Initial Access (TA0001)
ATT&CK techniques: Phishing (T1566)
Detector tags: Microsoft Teams
Attacker's goals:

Attackers may leverage Microsoft Teams to conduct phishing attacks by exploiting trusted communication channels with users inside the organization.

Investigative actions:

Verify the suspicious activity to validate the legitimacy of the user's actions. Review Teams chat logs and meeting invites for interactions with external tenants, focusing on unusual file sharing or unsolicited links. Hunt for known phishing indicators (suspicious domains, URL patterns, or IPs) in the Teams messages and linked content. Evaluate the external tenant reputation. Check for anomalous MS Teams actions like suspicious application installation, message extraction, policy changes or internal spear phishing attempts linked to the user post-login. Follow further actions done by the account.

Test period:
12 Hours
Deduplication:
1 Day
1 variation:
  • Malicious activity had been detected with strong indicators Medium (parent: Low)