Sigma rule: Curl Usage on Linux

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-bd5432161e71, updated 2022-09-15T00:00:00.000Z.

Rule

Title
Curl Usage on Linux
Status
test
Level
low
Author
Nasreddine Bencherchali (Nextron Systems)
Date
2022-09-15
File
rules/linux/process_creation/proc_creation_lnx_curl_usage.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects a curl process start on linux, which indicates a file download from a remote location or a simple web request to a remote server

Log source

product
linux
category
process_creation

Detection

selection:
    Image|endswith: '/curl'
condition: selection

False positives (as the rule lists them)

  • Scripts created by developers and admins
  • Administrative activity

Tags

  • attack.command-and-control
  • attack.t1105

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/linux/process_creation/proc_creation_lnx_curl_usage.yml

Sources and licences

  • SigmaHQ

    "Curl Usage on Linux" by Nasreddine Bencherchali (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/linux/process_creation/proc_creation_lnx_curl_usage.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: Curl Usage on Linux",
entity page, dataset version ref-bd5432161e71, updated 2022-09-15T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/ea34fb97-e2c4-4afb-810f-785e4459b194 (accessed 2026-11-03).
Underlying source: SigmaHQ rule ea34fb97-e2c4-4afb-810f-785e4459b194, 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.