Suspicious Kernel Driver Written to AppData Temp Linked to RansomHub EDR Killers

ATT&CK techniques

Persistence → Priv Esc

Recon
Resource Dev
Initial Access
Execution
Persistence
- T1543.003Windows Service
Priv Esc
- T1543.003Windows Service
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects a .sys kernel driver file being written into a user AppData Temp directory, a staging behavior used by RansomHub-associated EDR-killer tooling such as EDRKillShifter. Legitimate drivers are almost never dropped to per-user temp paths, so a driver in AppData Temp strongly suggests bring-your-own-vulnerable-driver defense evasion.

Reporting behind it

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Suspicious Kernel Driver Written to AppData Temp Linked to RansomHub EDR Killers

Pivot detection · T1685 · 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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