Analytics Informational
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User sent messages in Microsoft Teams to multiple conversations via Graph API

A user who rarely uses the Graph API for Microsoft Teams messaging sent multiple messages using it.

Module:
Identity Threat Detection (ITDR), SaaS Threat Detection
Licensed by:
Identity Threat Detection (ITDR)
Data source:
Microsoft Graph Logs
ATT&CK tactics: Lateral Movement (TA0008)
ATT&CK techniques: Internal Spearphishing (T1534)
Detector tags: Microsoft Teams
Attacker's goals:

Attackers may leverage a compromised user account to send phishing or malicious messages via Graph API to multiple recipients, aiming to propagate the attack while evading detection.

Investigative actions:

Verify the user's role and typical usage of Microsoft Graph API. Check if the user's account has recently logged in from unusual locations or devices. Review recent email and chat activity to identify any phishing or suspicious messages sent. Examine the Graph API call logs to see what actions were performed and their timestamps. Correlate with endpoint logs to detect any malware or suspicious processes running on the user's device. Check for signs of account compromise, such as password changes or MFA bypass attempts. Follow further actions done by the account.

Test period:
1 Hour
Deduplication:
1 Day
1 variation:
  • User sent messages in Microsoft Teams to several conversations via Graph API with suspicious characteristics Low (parent: Informational)