Suspicious Remote MSI Package Execution from Azure Blob Storage via msiexec (via process_creation)

ATT&CK techniques

Defense Evasion

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
- T1218.007Msiexec
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects msiexec.exe installing an MSI package fetched directly from Azure Blob Storage, the SynkLoader delivery behavior in which 331.msi was retrieved from a filereserve blob URL to stage a hidden PowerShell and Python loader. Adversaries abuse msiexec as a trusted installer to pull and execute remote packages while bypassing download controls, making early detection critical for catching the intrusion at the delivery stage.

Reporting behind it

Related detections9 linkedT1218.007 — drag to rearrange

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Suspicious Silent MSI Installation of Non-Standard BIN Payload via Msiexec (via process_creation)

Suspicious Antivirus Uninstallation via msiexec (via process_creation)

Suspicious Screensaver File Executed as Installer via process_creation

Suspicious Remote MSI Package Execution from Azure Blob Storage via msiexec (via process_creation)

Pivot detection · T1218.007 · 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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