RDP to HTTP or HTTPS Target Ports — Sigma Rule

Rule metadata and linked tags

Author: Florian Roth (Nextron Systems). Source status: test; severity: high. Source dates: 2022-04-29 / 2022-07-14.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: ba82d2a5fcb243bc83e1129042822ce02b9b78c94169062a264c4f55d0bfd7d7

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 to HTTP or HTTPS Target Ports
id: b1e5da3b-ca8e-4adf-915c-9921f3d85481
status: test
description: Detects svchost hosting RDP termsvcs communicating to target systems on TCP port 80 or 443
references:
    - https://twitter.com/tekdefense/status/1519711183162556416?s=12&t=OTsHCBkQOTNs1k3USz65Zg
    - https://www.mandiant.com/resources/bypassing-network-restrictions-through-rdp-tunneling
author: Florian Roth (Nextron Systems)
date: 2022-04-29
modified: 2022-07-14
tags:
    - attack.command-and-control
    - attack.t1572
    - attack.lateral-movement
    - attack.t1021.001
    - car.2013-07-002
logsource:
    category: network_connection
    product: windows
detection:
    selection:
        Image|endswith: '\svchost.exe'
        Initiated: 'true'
        SourcePort: 3389
        DestinationPort:
            - 80
            - 443
    condition: selection
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://twitter.com/tekdefense/status/1519711183162556416?s=12&t=OTsHCBkQOTNs1k3USz65Zg
• https://www.mandiant.com/resources/bypassing-network-restrictions-through-rdp-tunneling