Suspicious Tomcat Manager WAR Deployment via HTTP PUT by UNC6201
- Category
- webserver
- Author
- HuntRule
- Published
- 2026-08-01
- Updated
- 2026-08-28
ATT&CK techniques
Initial Access → 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 an HTTP PUT to the Tomcat manager text deploy endpoint with update set to true which UNC6201 used to upload a WAR web shell after abusing default manager credentials. Attackers deploy the GRIMBOLT backdoor as a running web application to gain root on Dell RecoverPoint appliances.
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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