Sigma rule: Insecure Proxy/DOH Transfer Via Curl.EXE

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-cb9d4e64728a, updated 2023-07-27T00:00:00.000Z.

Rule

Title
Insecure Proxy/DOH Transfer Via Curl.EXE
Status
test
Level
medium
Author
Nasreddine Bencherchali (Nextron Systems)
Date
2023-07-27
File
rules/windows/process_creation/proc_creation_win_curl_insecure_proxy_or_doh.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects execution of "curl.exe" with the "insecure" flag over proxy or DOH.

Log source

product
windows
category
process_creation

Detection

selection_img:
    - Image|endswith: '\curl.exe'
    - OriginalFileName: 'curl.exe'
selection_cli:
    CommandLine|contains:
        - '--doh-insecure'
        - '--proxy-insecure'
condition: all of selection_*

False positives (as the rule lists them)

  • Access to badly maintained internal or development systems

Tags

  • attack.execution

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_curl_insecure_proxy_or_doh.yml

Sources and licences

  • SigmaHQ

    "Insecure Proxy/DOH Transfer Via Curl.EXE" by Nasreddine Bencherchali (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_curl_insecure_proxy_or_doh.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: Insecure Proxy/DOH Transfer Via Curl.EXE",
entity page, dataset version ref-cb9d4e64728a, updated 2023-07-27T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/2c1486f5-02e8-4f86-9099-b97f2da4ed77 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 2c1486f5-02e8-4f86-9099-b97f2da4ed77, 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.