Malicious MOVEit Transfer Exploitation via X-siLock HTTP Headers (via webserver)

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 inbound HTTP requests carrying the X-siLock-Step1 or X-siLock-Step3 headers used by the MOVEit Transfer exploit toolkit. These custom headers drive the CVE-2023-34362 exploitation flow and indicate an attacker interacting with the human2.aspx web shell to exfiltrate data.

Reporting behind it

Related detections9 linkedT1190 — drag to rearrange

Malicious IIS w3wp Worker Spawning Command Interpreter via SharePoint Web Shell

Suspicious Single-Character Named Executable Launched by Web Server Process (via process_creation)

Malicious MOVEit human2.aspx Web Shell Dropped in wwwroot (via file_event)

Malicious IIS Worker Process Spawning PowerShell via Gladinet CentreStack Exploit

Exchange Worker Process Spawning Command Shell via OWASSRF

Suspicious PowerShell Spawned by SysAid Java Process

Possible Ivanti EPMM In-Memory Java Webshell Access via mifs 403.jsp

Suspicious TOLLBOOTH Webshell URI Access

Suspicious Child Process Spawned by IIS Worker Process w3wp

Malicious MOVEit Transfer Exploitation via X-siLock HTTP Headers (via webserver)

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.

Full detection rule

Unlock this rule to view and copy it

The detection logic is included with a plan. Everything else — context, mappings and implementation details — stays free on this page.

Sign in for 3 free unlocks

Signing in gives you 3 unlocks to spend on any rule in the library. No card, and they do not expire.

Also included

Unlocked rules convert on this page — to Splunk SPL or Splunk — Raw Index SPL or Microsoft Sentinel KQL or Microsoft Sentinel ASIM ASIM KQL or Microsoft Defender XDR KQL or Elastic Security KQL or Elastic Security Lucene or Elastic Security ES|QL or CrowdStrike Falcon CQL or SentinelOne PowerQuery or Palo Alto Cortex XDR XQL or Carbon Black Cloud Platform Search or Carbon Black EDR Process Search or Google Security Operations UDM Search or IBM QRadar AQL or Sumo Logic Cloud SIEM Rules expression or Rapid7 InsightIDR LEQL or Graylog Search or OpenSearch Lucene or OpenSearch PPL PPL or Grafana Loki LogQL or SQLite SQL or Zircolite SQLite — with the log-source profile the engine picked, the field map it used, and everything it could not express. Converting a rule you have unlocked costs no further credit.

See it run on a free rule →Convert your own rule →