Analytics Low
✕

Possible phishing attack via Microsoft Teams

An external tenant is possibly attempting a phishing attack via Microsoft Teams.

Module:
Identity Threat Detection (ITDR)
Licensed by:
Identity Threat Detection (ITDR)
Data source:
AzureAD Audit Log, Microsoft Graph Logs, Office 365 Audit, Okta, Palo Alto Networks Global Protect, Third-Party VPNs, XDR Agent, XDR Agent with eXtended Threat Hunting (XTH)
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 sign-in activity to validate the legitimacy of the suspicious login. 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:
5 Hours
Deduplication:
1 Day
3 variations:
  • Potential phishing attack with post compromise stages had been detected High (parent: Low)
  • Potential phishing attack via Microsoft Teams has been detected Medium (parent: Low)
  • Potential phishing attack with post compromise activities in Microsoft Teams has been detected Medium (parent: Low)