1200KM / detection
T1546.001 Change Default File Association — Detection Rules
Detection workspace for T1546.001 Change Default File Association: 5 Sigma sources, 0 Atlas concepts and 0 anomaly models. No live detection validation.
Source-backed rule directory
- Change Default File Association Via Assoc · test · low · {"category":"process_creation","product":"windows"}
- Change Default File Association To Executable Via Assoc · test · high · {"category":"process_creation","product":"windows"}
- Registry Modification of MS-settings Protocol Handler · test · medium · {"category":"process_creation","product":"windows"}
- Shell Open Registry Keys Manipulation · test · high · {"category":"registry_event","product":"windows"}
- Suspicious Shell Open Command Registry Modification · experimental · medium · {"category":"registry_set","product":"windows"}
Atlas deterministic concepts
No exact concept selected.
Anomaly models
No exact Atlas model in this snapshot.
ATT&CK analytic guidance
DET0061 Detect Default File Association Hijack via Registry & Execution Correlation on Windows
AN0170 Analytic 0170
Detects modification of registry keys used for default file handlers, followed by anomalous process execution from user-initiated file opens. This includes tracking changes under HKCU and HKCR for file extension mappings, and correlating them with new or suspicious handler paths launching unusual child processes (e.g., PowerShell, cmd, wscript).
Connected ecosystem references
Linked tags
Simulation, tools and telemetry
Threat actor context
These are explicit actor-to-technique associations in the existing Threat Matrix snapshot, not attribution of an event or proof that a detector identifies the actor. No tool-to-actor relationship is inferred.
Existing anomaly research
Pinned research references. No browser attack runner, live simulation result or validated detector is asserted. Source mappings and validation limits are preserved. ATT&CK / Atomic provenance · Detection provenance.