Suspicious File Association Shell Command Handler Hijack via Registry
- Product
- windows
- Category
- registry_set
- Author
- HuntRule
- Published
- 2026-09-22
- Updated
- 2026-09-22
ATT&CK techniques
Persistence → Priv EscRecon
Resource Dev
Initial Access
Execution
Persistence
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact
What it detects
This rule detects modification of a shell open command handler under the user Classes hive, a file-association hijack SolarMarker uses to trigger its payload when a document type is opened. Redirecting the open command executes attacker code transparently. Detecting the change exposes execution-hijack persistence.
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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