Known false positives
- Administrative activity
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Command & Control |
Telemetry coverage
| Provider | Record / event type |
|---|---|
| Sysmon | Event ID 1: Process creation |
Rule body
title: PUA - 3Proxy Execution
id: f38a82d2-fba3-4781-b549-525efbec8506
status: test
description: Detects the use of 3proxy, a tiny free proxy server
references:
- https://github.com/3proxy/3proxy
- https://blog.talosintelligence.com/2022/09/lazarus-three-rats.html
author: Florian Roth (Nextron Systems)
date: 2022-09-13
modified: 2023-02-21
tags:
- attack.command-and-control
- attack.t1572
logsource:
category: process_creation
product: windows
detection:
selection_img:
Image|endswith: '\3proxy.exe'
selection_pe:
Description: '3proxy - tiny proxy server'
selection_params: # param combos seen in the wild
CommandLine|contains: '.exe -i127.0.0.1 -p'
condition: 1 of selection_*
falsepositives:
- Administrative activity
level: high
Stages and Predicates
Stage 0: condition
1 of selection_*Stage 1: selection_img
selection_img:
Image|endswith: '\3proxy.exe'
Stage 2: selection_pe
selection_pe:
Description: '3proxy - tiny proxy server'
Stage 3: selection_params
selection_params:
CommandLine|contains: '.exe -i127.0.0.1 -p'
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
CommandLine | match |
| field:"CommandLine" kind:match value:".exe -i127.0.0.1 -p" |
Description | eq |
| field:"Description" kind:eq value:"3proxy - tiny proxy server" |
Image | ends_with |
| field:"Image" kind:ends_with value:"\3proxy.exe" |