WMI Event Consumer Persistence Named System__Cmr

ATT&CK techniques

Persistence → Priv Esc

Recon
Resource Dev
Initial Access
Execution
Persistence
- T1546.003Windows Management Instrumentation Event Subscription
Priv Esc
- T1546.003Windows Management Instrumentation Event Subscription
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects references to the WMI event consumer name System__Cmr, a persistence artifact created during ScreenConnect post-exploitation to re-execute payloads on system events. Huntress recovered this named consumer as an operator-specific persistence mechanism. The distinctive consumer name is a reliable indicator of this intrusion set installing WMI-based persistence.

Reporting behind it

Related detections9 linkedT1546.003 — drag to rearrange

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Windows WMI Event Consumer with Encoded Payload Containing Suspicious Strings

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Windows Process Creation: WMIC.exe ActiveScriptEventConsumer Creation Attempt

Windows Security 4624 Logon for scrcons.exe Indicating Remote WMI ActiveScriptEventConsumers

WMI scrcons.exe Loading Script and WMI DLLs via Image Load (Windows)

Windows WMI Backdoor in Exchange Transport Agent via WMI Event Filter Execution

Windows WMI Event Subscription Creation (Sysmon Event 19/20/21)

WMI Event Consumer Persistence Named System__Cmr

Pivot detection · T1546.003 · 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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