Suspicious Remote MSI Installation from Amazon S3 via msiexec

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 msiexec installing a package directly from an Amazon S3 URL, the delivery method observed during Velociraptor misuse where MsiInstaller events showed remote packages fetched from cloud storage. Remote MSI installation lets attackers deploy tooling without staging files locally. Interactive installs from arbitrary S3 URLs are rarely legitimate on production endpoints.

Reporting behind it

Related detections9 linkedT1105 — drag to rearrange

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Malicious Remote MSI Execution with Image Extension via msiexec (via process_creation)

Suspicious Msiexec Remote Package Installation from URL via Process Creation

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

Windows msiexec Process Creation With Web URL Parameters

Malicious Web Server Spawning Command Shell and curl Download via Webshell

Suspicious Download or Exfiltration via Finger LOLBin

Suspicious Remote MSI Installation from Amazon S3 via msiexec

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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