Sigma rule: PUA - 3Proxy Execution

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-346f510a4da4, updated 2023-02-21T00:00:00.000Z.

Rule

Title
PUA - 3Proxy Execution
Status
test
Level
high
Author
Florian Roth (Nextron Systems)
Date
2022-09-13
Modified
2023-02-21
File
rules/windows/process_creation/proc_creation_win_pua_3proxy_execution.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects the use of 3proxy, a tiny free proxy server

Log source

product
windows
category
process_creation

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_*

False positives (as the rule lists them)

  • Administrative activity

Tags

  • attack.command-and-control
  • attack.t1572

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_pua_3proxy_execution.yml

Sources and licences

  • SigmaHQ

    "PUA - 3Proxy Execution" by Florian Roth (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_pua_3proxy_execution.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: PUA - 3Proxy Execution",
entity page, dataset version ref-346f510a4da4, updated 2023-02-21T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/f38a82d2-fba3-4781-b549-525efbec8506 (accessed 2026-11-03).
Underlying source: SigmaHQ rule f38a82d2-fba3-4781-b549-525efbec8506, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.