huntrule

Web Server GET Requests Containing SSTI Payload Strings (Server-Side Template Injection)

Flags GET requests containing SSTI probe strings in web access logs when the response is not 404.

FreeReviewedSigma · High · v2
Category
webserver
Author
Nasreddine Bencherchali (Nextron Systems) (SigmaHQ), DRL 1.1
Published
2022-06-14
Updated
2026-07-31
AnalysisDetection

ATT&CK techniques

Defense Evasion

  1. Recon

  2. Resource Dev

  3. Initial Access

  4. Execution

  5. Persistence

  6. Priv Esc

  7. Defense Evasion

  8. Cred Access

  9. Discovery

  10. Lateral Movement

  11. Collection

  12. C2

  13. Exfiltration

  14. Impact

What it detects

This rule identifies potential server-side template injection attempts in web server access logs by matching GET requests that contain common SSTI payload patterns. Attackers may use these strings to trigger server-side template evaluation and execute unintended logic or code. The detection relies on HTTP method and specific keyword fragments in logged request data, and it excludes matches where the server response status is 404.

Reporting behind it

Related detections3 linkedT1221 — drag to rearrange
Suspicious Office Application Spawning Script Interpreter (via process_creation)
Malicious Equation Editor Child Process Execution via process_creation
Windows Registry Set of ms-msdt MSProtocol URI (CVE-2022-30190)
Web Server GET Requests Containing SSTI Payload Strings (Server-Side Template Injection)
Pivot detection · T1221 · 3 related

Changelog

v2
  1. v2
    Candidate ingested via manual entry.2026-07-31
  2. v1
    No changelog recorded for this version.2026-07-30

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