SumatraPDF Execution from User Download Directory in Operation DreamJob (via process_creation)

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 SumatraPDF.exe executing from a Downloads or Temp directory, matching the Operation DreamJob delivery in which a ZIP archive bundles a decoy PDF with a portable SumatraPDF.exe and a malicious libmupdf.dll for side-loading. Adversaries ship a portable signed reader alongside their loader so a single user action triggers execution from an untrusted location.

Reporting behind it

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SumatraPDF Execution from User Download Directory in Operation DreamJob (via process_creation)

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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