Malicious SentinelOne DLL Sideloading via SentinelUI (via image_load)

ATT&CK techniques

Execution → Defense Evasion

Recon
Resource Dev
Initial Access
Execution
- T1574.001DLL
Persistence
- T1574.001DLL
Priv Esc
- T1574.001DLL
Defense Evasion
- T1574.001DLL
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects the SentinelUI executable loading a SentinelAgentCore.dll from a location outside the legitimate SentinelOne installation directory, the DLL search order hijack used by actors exploiting the ConnectWise ScreenConnect flaws to deploy Cobalt Strike and LockBit. Sideloading through a trusted security agent name lets the payload execute with reduced suspicion, so an off path load of this pairing indicates active post exploitation.

Reporting behind it

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Malicious SentinelOne DLL Sideloading via SentinelUI (via image_load)

Pivot detection · T1574.001 · 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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