Suspicious Tomcat Manager WAR Deployment via HTTP PUT by UNC6201

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 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

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Suspicious Tomcat Manager WAR Deployment via HTTP PUT by UNC6201

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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