Masquerading Bumblebee Loader MSI Download via PowerShell Invoke-WebRequest and Silent msiexec (via process_creation)

ATT&CK techniques

Defense Evasion → C2

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
- T1218.007Msiexec
Cred Access
Discovery
Lateral Movement
Collection
C2
- T1105Ingress Tool Transfer
Exfiltration
Impact

What it detects

This rule detects a single PowerShell command that uses Invoke-WebRequest to download an MSI installer and then launches msiexec silently, the delivery behavior used by an LNK-triggered Bumblebee loader infection chain masquerading as Nvidia and Midjourney installers. Chaining a remote MSI fetch with a quiet install in one command line is a strong indicator of staged loader delivery before in-memory payload execution.

Reporting behind it

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Windows msiexec Process Creation With Web URL Parameters

Malicious Hidden Virtual Machine Launched via QEMU for Persistence

Suspicious node.exe Execution Spawned by PowerShell

Masquerading Bumblebee Loader MSI Download via PowerShell Invoke-WebRequest and Silent msiexec (via process_creation)

Pivot detection · T1105 · 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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