Suspicious JSP Webshell Written to SAP irj work Directory (via file_event)
- Category
- file_event
- Author
- HuntRule
- Published
- 2026-05-15
- Updated
- 2026-08-28
ATT&CK techniques
PersistenceRecon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact
What it detects
This rule detects JSP files being written under the SAP servlet_jsp irj work directory, the deployment location where CVE-2025-31324 exploitation dropped webshells such as forwardsap.jsp and helper.jsp. New JSP files appearing in this runtime path indicate server software component abuse. This is a reliable webshell persistence signal.
Reporting behind it
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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