SigmaHQ/rules/windows/registry_event/win_portproxy_registry_key.yml

title: PortProxy Registry Key
id: a54f842a-3713-4b45-8c84-5f136fdebd3c
status: experimental
description: Detects the modification of PortProxy registry key which is used for port forwarding. For command execution see rule win_netsh_port_fwd.yml.
references:
    - https://www.fireeye.com/blog/threat-research/2019/01/bypassing-network-restrictions-through-rdp-tunneling.html
    - https://adepts.of0x.cc/netsh-portproxy-code/
    - https://www.dfirnotes.net/portproxy_detection/
date: 2021/06/22
tags:
    - attack.lateral_movement
    - attack.defense_evasion
    - attack.command_and_control
    - attack.t1090
author: Andreas Hunkeler (@Karneades)
logsource:
    category: registry_event
    product: windows
detection:
    selection_registry:
        TargetObject: 'HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\PortProxy\v4tov4\tcp'
    condition: selection_registry
falsepositives:
    - WSL2 network bridge PowerShell script used for WSL/Kubernetes/Docker (e.g. https://github.com/microsoft/WSL/issues/4150#issuecomment-504209723)
    - Synergy Software KVM (https://symless.com/synergy)
level: medium
rule: add port proxy registry rule and add references 2021-06-22 06:16:56 +00:00			`title: PortProxy Registry Key`
			`id: a54f842a-3713-4b45-8c84-5f136fdebd3c`
			`status: experimental`
			`description: Detects the modification of PortProxy registry key which is used for port forwarding. For command execution see rule win_netsh_port_fwd.yml.`
			`references:`
			`- https://www.fireeye.com/blog/threat-research/2019/01/bypassing-network-restrictions-through-rdp-tunneling.html`
			`- https://adepts.of0x.cc/netsh-portproxy-code/`
			`- https://www.dfirnotes.net/portproxy_detection/`
			`date: 2021/06/22`
			`tags:`
			`- attack.lateral_movement`
			`- attack.defense_evasion`
			`- attack.command_and_control`
			`- attack.t1090`
			`author: Andreas Hunkeler (@Karneades)`
			`logsource:`
			`category: registry_event`
			`product: windows`
			`detection:`
			`selection_registry:`
			`TargetObject: 'HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\PortProxy\v4tov4\tcp'`
			`condition: selection_registry`
			`falsepositives:`
Add fp note to PortProxy rules 2021-06-24 09:21:29 +00:00			`- WSL2 network bridge PowerShell script used for WSL/Kubernetes/Docker (e.g. https://github.com/microsoft/WSL/issues/4150#issuecomment-504209723)`
Add Synergy as possible FP for PortProxy key 2021-06-28 10:10:16 +00:00			`- Synergy Software KVM (https://symless.com/synergy)`
rule: add port proxy registry rule and add references 2021-06-22 06:16:56 +00:00			`level: medium`