Suspicious NimDoor Exfiltration Staging Directory Creation via uplex Prefix (via file_event)

ATT&CK techniques

Collection

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
- T1074.001Local Data Staging
C2
Exfiltration
Impact

What it detects

This rule detects NimDoor staging stolen browser and credential data into a temporary directory whose path begins with the uplex prefix under private var tmp. The directory holds harvested data before exfiltration over the C2 channel. This distinctive staging path is not produced by legitimate macOS software.

Reporting behind it

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Suspicious NimDoor Exfiltration Staging Directory Creation via uplex Prefix (via file_event)

Pivot detection · T1074.001 · 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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