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Suspicious TCP Tunnel Via PowerShell Script — Sigma Rule

Sigma rule bd33d2aa-497e-4651-9893-5c5364646595. Suspicious TCP Tunnel Via PowerShell Script — Sigma Rule. Detects powershell scripts that creates sockets/listeners which could be indicative of tunneling activity

Rule metadata and linked tags

testmediumwindowsps_scriptattack.command-and-controlattack.t1090

Author: Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: medium. Source dates: 2022-07-08 / not supplied.

{
  "product": "windows",
  "category": "ps_script",
  "definition": "Requirements: Script Block Logging must be enabled"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 8b93f93f1143b391b3a60c275c5c4203401f5161bf391771aad720615659524b

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: Suspicious TCP Tunnel Via PowerShell Script
id: bd33d2aa-497e-4651-9893-5c5364646595
status: test
description: Detects powershell scripts that creates sockets/listeners which could be indicative of tunneling activity
references:
    - https://github.com/Arno0x/PowerShellScripts/blob/a6b7d5490fbf0b20f91195838f3a11156724b4f7/proxyTunnel.ps1
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-07-08
tags:
    - attack.command-and-control
    - attack.t1090
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection:
        ScriptBlockText|contains|all:
            - '[System.Net.HttpWebRequest]'
            - 'System.Net.Sockets.TcpListener'
            - 'AcceptTcpClient'
    condition: selection
falsepositives:
    - Unknown
level: medium

Original YAML and metadata in JSON

False positives

  • Unknown

Source references

Connected ecosystem references

Exact source-tagged techniques

Telemetry review

Read the original logsource above, then inspect the linked detection workspaces for technique-level sensor context. No per-rule telemetry equivalence is inferred.

Pinned research references. No browser attack runner, live simulation result or validated detector is asserted. Source mappings and validation limits are preserved. ATT&CK / Atomic provenance · Detection provenance.