Sigma rule: System Network Connections Discovery - Linux

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-92174f780171, updated 2023-01-17T00:00:00.000Z.

Rule

Title
System Network Connections Discovery - Linux
Status
test
Level
low
Author
Daniil Yugoslavskiy, oscd.community
Date
2020-10-19
Modified
2023-01-17
File
rules/linux/process_creation/proc_creation_lnx_system_network_connections_discovery.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects usage of system utilities to discover system network connections

Log source

product
linux
category
process_creation

Detection

selection:
    Image|endswith:
        - '/who'
        - '/w'
        - '/last'
        - '/lsof'
        - '/netstat'
filter_landscape_sysinfo:
    ParentCommandLine|contains: '/usr/bin/landscape-sysinfo'
    Image|endswith: '/who'
condition: selection and not 1 of filter_*

False positives (as the rule lists them)

  • Legitimate activities

Tags

  • attack.discovery
  • attack.t1049

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_system_network_connections_discovery.yml

Sources and licences

  • SigmaHQ

    "System Network Connections Discovery - Linux" by Daniil Yugoslavskiy, oscd.community (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/linux/process_creation/proc_creation_lnx_system_network_connections_discovery.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: System Network Connections Discovery - Linux",
entity page, dataset version ref-92174f780171, updated 2023-01-17T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/4c519226-f0cd-4471-bd2f-6fbb2bb68a79 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 4c519226-f0cd-4471-bd2f-6fbb2bb68a79, 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.