Malicious Lunar Spider Loader Execution via rundll32 (via process_creation)

ATT&CK techniques

Execution → Defense Evasion

Recon
Resource Dev
Initial Access
Execution
- T1204.002Malicious File
Persistence
Priv Esc
Defense Evasion
- T1218.011Rundll32
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects rundll32.exe loading the malicious upfilles.dll with the stow export. This behavior was observed in a Lunar Spider intrusion where a signed LOLBin was abused to run a malicious loader DLL. Detecting it exposes early execution and defense evasion before follow-on persistence and domain compromise.

Reporting behind it

Related detections9 linkedT1218.011 — drag to rearrange

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Malicious Silent AteraAgent RMM Installation via IntegratorLogin

Malicious Lunar Spider Loader Execution via rundll32 (via process_creation)

Pivot detection · T1218.011 · 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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