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Suspicious TCP Tunnel Via PowerShell Script

Detects powershell scripts that creates sockets/listeners which could be indicative of tunneling activity

MITRE ATT&CK

command-and-control

Detection Query

selection:
  ScriptBlockText|contains|all:
    - "[System.Net.HttpWebRequest]"
    - System.Net.Sockets.TcpListener
    - AcceptTcpClient
condition: selection

Author

Nasreddine Bencherchali (Nextron Systems)

Created

2022-07-08

Data Sources

windowsps_script

Platforms

windows

References

https://github.com/Arno0x/PowerShellScripts/blob/a6b7d5490fbf0b20f91195838f3a11156724b4f7/proxyTunnel.ps1

Tags

attack.command-and-controlattack.t1090

Raw Content

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