huntrule

Malicious BeyondTrust Bomgar Agent Spawning Command Shell via Remote Support Exploitation (via process_creation)

PremiumReviewedSigma · High · v1
Product
windows
Category
process_creation
Author
HuntRule
Published
2026-10-21
Updated
2026-10-21
AnalysisDetection

ATT&CK techniques

Initial Access → Execution

  1. Recon

  2. Resource Dev

  3. Initial Access

  4. Execution

  5. Persistence

  6. Priv Esc

  7. Defense Evasion

  8. Cred Access

  9. Discovery

  10. Lateral Movement

  11. Collection

  12. C2

  13. Exfiltration

  14. Impact

What it detects

This rule detects the BeyondTrust Bomgar remote support agent spawning a command shell, a behavior observed during exploitation of critical vulnerability CVE-2026-1731 by actors deploying VShell and SparkRAT. The remote support binary should not launch cmd.exe or powershell.exe, so this chain indicates remote code execution against the appliance and warrants immediate response.

Reporting behind it

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Malicious BeyondTrust Bomgar Agent Spawning Command Shell via Remote Support Exploitation (via process_creation)
Pivot detection · T1059.001 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.