PUA - Fast Reverse Proxy (FRP) Execution

Description

Detects the use of Fast Reverse Proxy. frp is a fast reverse proxy to help you expose a local server behind a NAT or firewall to the Internet.

Query · sigma

selection_img:
  Image|endswith:
  - \frpc.exe
  - \frps.exe
selection_cli:
  CommandLine|contains: \frpc.ini
selection_hashes:
  Hashes|contains:
  - MD5=7D9C233B8C9E3F0EA290D2B84593C842
  - SHA1=06DDC9280E1F1810677935A2477012960905942F
  - SHA256=57B0936B8D336D8E981C169466A15A5FD21A7D5A2C7DAF62D5E142EE860E387C
condition: 1 of selection_*

Known false positives

  • Legitimate use
Raw source PUA - Fast Reverse Proxy (FRP) Execution · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: PUA - Fast Reverse Proxy (FRP) Execution
id: 32410e29-5f94-4568-b6a3-d91a8adad863
status: test
description: Detects the use of Fast Reverse Proxy. frp is a fast reverse proxy to help you expose a local server behind a NAT or firewall to the Internet.
references:
    - https://asec.ahnlab.com/en/38156/
    - https://github.com/fatedier/frp
author: frack113, Florian Roth
date: 2022-09-02
modified: 2024-11-23
tags:
    - attack.command-and-control
    - attack.t1090
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        Image|endswith:
            - '\frpc.exe'
            - '\frps.exe'
    selection_cli:
        CommandLine|contains: '\frpc.ini'
    selection_hashes:
        # v0.44.0
        Hashes|contains:
            - "MD5=7D9C233B8C9E3F0EA290D2B84593C842"
            - "SHA1=06DDC9280E1F1810677935A2477012960905942F"
            - "SHA256=57B0936B8D336D8E981C169466A15A5FD21A7D5A2C7DAF62D5E142EE860E387C"
    condition: 1 of selection_*
falsepositives:
    - Legitimate use
level: high

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