Suspicious C2Looper DLL Side-Loading via OneDrive wtsapi32 (via file_event)

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 wtsapi32.dll being written into the user OneDrive directory where C2Looper places it to be side loaded by the legitimate OneDrive executable. The genuine OneDrive binary does not require this DLL in its user profile directory.

Reporting behind it

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Suspicious C2Looper DLL Side-Loading via OneDrive wtsapi32 (via file_event)

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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