detection.wiki

Detection rules › Sigma

DNS Query To Devtunnels Domain

Status
test
Severity
medium
Log source
category dns_query, product windows
Author
citron_ninja
Source
github.com/SigmaHQ/sigma

Detects DNS query requests to Devtunnels domains. Attackers can abuse that feature to establish a reverse shell or persistence on a machine.

Known false positives

  • Legitimate use of Devtunnels will also trigger this.

MITRE ATT&CK coverage

TacticTechniques
Command & Control

Telemetry coverage

ProviderRecord / event type
SysmonEvent ID 22: DNSEvent (DNS query)

Rule body

title: DNS Query To Devtunnels Domain
id: 1cb0c6ce-3d00-44fc-ab9c-6d6d577bf20b
related:
    - id: 9501f8e6-8e3d-48fc-a8a6-1089dd5d7ef4 # Net Connection DevTunnels
      type: similar
    - id: 4b657234-038e-4ad5-997c-4be42340bce4 # Net Connection VsCode
      type: similar
    - id: b3e6418f-7c7a-4fad-993a-93b65027a9f1 # DNS VsCode
      type: similar
status: test
description: |
    Detects DNS query requests to Devtunnels domains. Attackers can abuse that feature to establish a reverse shell or persistence on a machine.
references:
    - https://blueteamops.medium.com/detecting-dev-tunnels-16f0994dc3e2
    - https://learn.microsoft.com/en-us/azure/developer/dev-tunnels/security
    - https://cydefops.com/devtunnels-unleashed
author: citron_ninja
date: 2023-10-25
modified: 2023-11-20
tags:
    - attack.command-and-control
    - attack.t1071.001
    - attack.t1572
logsource:
    category: dns_query
    product: windows
detection:
    selection:
        QueryName|endswith: '.devtunnels.ms'
    condition: selection
falsepositives:
    - Legitimate use of Devtunnels will also trigger this.
level: medium

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    QueryName|endswith: '.devtunnels.ms'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
QueryNameends_with
  • .devtunnels.ms
field:"QueryName" kind:ends_with value:".devtunnels.ms"