Possible MOVEit Transfer Exploitation via MOVEitISAPI action m2 and X-siLock Headers

ATT&CK techniques

Initial Access → Persistence

Recon
Resource Dev
Initial Access
- T1190Exploit Public-Facing Application
Execution
Persistence
- T1505.003Web Shell
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects requests to MOVEitISAPI.dll with action=m2 that also carry X-siLock control headers, matching the MOVEit Transfer RCE chain analyzed by Assetnote for CVE-2023-34362. The X-siLock headers drive internal session-variable manipulation used in the SQL injection to RCE path. Detecting this handler and header pairing surfaces active exploitation of the MOVEit ISAPI extension.

Reporting behind it

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Possible MOVEit Transfer Exploitation via MOVEitISAPI action m2 and X-siLock Headers

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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