RDP over Reverse SSH Tunnel WFP — Sigma Rule

Rule metadata and linked tags

Author: Samir Bousseaden. Source status: test; severity: high. Source dates: 2019-02-16 / 2022-09-02.

{
  "product": "windows",
  "service": "security"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 7b01c815569a784103ee36e81762bccb6f16c58199e8e9054739d40aad38d90a

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: RDP over Reverse SSH Tunnel WFP
id: 5bed80b6-b3e8-428e-a3ae-d3c757589e41
status: test
description: Detects svchost hosting RDP termsvcs communicating with the loopback address
references:
    - https://twitter.com/SBousseaden/status/1096148422984384514
    - https://github.com/sbousseaden/EVTX-ATTACK-SAMPLES/blob/44fbe85f72ee91582876b49678f9a26292a155fb/Command%20and%20Control/DE_RDP_Tunnel_5156.evtx
author: Samir Bousseaden
date: 2019-02-16
modified: 2022-09-02
tags:
    - attack.command-and-control
    - attack.lateral-movement
    - attack.t1090.001
    - attack.t1090.002
    - attack.t1021.001
    - car.2013-07-002
logsource:
    product: windows
    service: security
detection:
    selection:
        EventID: 5156
    sourceRDP:
        SourcePort: 3389
        DestAddress:
            - '127.*'
            - '::1'
    destinationRDP:
        DestPort: 3389
        SourceAddress:
            - '127.*'
            - '::1'
    filter_app_container:
        FilterOrigin: 'AppContainer Loopback'
    filter_thor:  # checking BlueKeep vulnerability
        Application|endswith:
            - '\thor.exe'
            - '\thor64.exe'
    condition: selection and ( sourceRDP or destinationRDP ) and not 1 of filter*
falsepositives:
    - Programs that connect locally to the RDP port
level: high

Original YAML and metadata in JSON

False positives

• Programs that connect locally to the RDP port

Source references

• https://twitter.com/SBousseaden/status/1096148422984384514
• https://github.com/sbousseaden/EVTX-ATTACK-SAMPLES/blob/44fbe85f72ee91582876b49678f9a26292a155fb/Command%20and%20Control/DE_RDP_Tunnel_5156.evtx