Suspicious MOVEit Transfer Token Request with grant_type session

ATT&CK techniques

Initial Access

Recon
Resource Dev
Initial Access
- T1190Exploit Public-Facing Application
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects POST requests to the MOVEit Transfer token API using grant_type=session, matching the authentication step in the Assetnote MOVEit Transfer RCE chain for CVE-2023-34362 where a smuggled session is exchanged for a valid token. Attackers use this to convert manipulated session state into authenticated API access. The specific grant type on the token endpoint distinguishes exploitation from normal password or refresh grants.

Reporting behind it

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Suspicious MOVEit Transfer Token Request with grant_type session

Pivot detection · T1190 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

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