DNS HybridConnectionManager Service Bus — Sigma Rule

Rule metadata and linked tags

Author: Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research). Source status: test; severity: high. Source dates: 2021-04-12 / 2023-01-16.

{
  "product": "windows",
  "category": "dns_query"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 1f3bb50daee234d3b76672234bb86b3446ce5291bbd31beb877d41f6446745ce

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: DNS HybridConnectionManager Service Bus
id: 7bd3902d-8b8b-4dd4-838a-c6862d40150d
status: test
description: Detects Azure Hybrid Connection Manager services querying the Azure service bus service
references:
    - https://twitter.com/Cyb3rWard0g/status/1381642789369286662
author: Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research)
date: 2021-04-12
modified: 2023-01-16
tags:
    - attack.persistence
    - attack.t1554
logsource:
    product: windows
    category: dns_query
detection:
    selection:
        QueryName|contains: 'servicebus.windows.net'
        Image|contains: 'HybridConnectionManager'
    condition: selection
falsepositives:
    - Legitimate use of Azure Hybrid Connection Manager and the Azure Service Bus service
level: high

Original YAML and metadata in JSON

False positives

• Legitimate use of Azure Hybrid Connection Manager and the Azure Service Bus service

Source references

• https://twitter.com/Cyb3rWard0g/status/1381642789369286662