Sigma rule: Linux Network Service Scanning - Auditd

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-2331d2e5da28, updated 2023-09-26T00:00:00.000Z.

Rule

Title
Linux Network Service Scanning - Auditd
Status
test
Level
low
Author
Alejandro Ortuno, oscd.community
Date
2020-10-21
Modified
2023-09-26
File
rules/linux/auditd/syscall/lnx_auditd_network_service_scanning.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects enumeration of local or remote network services.

Log source

product
linux
service
auditd
definition
Configure these rules https://github.com/Neo23x0/auditd/blob/e181243a7c708e9d579557d6f80e0ed3d3483b89/audit.rules#L182-L183

Detection

selection:
    type: 'SYSCALL'
    exe|endswith:
        - '/telnet'
        - '/nmap'
        - '/netcat'
        - '/nc'
        - '/ncat'
        - '/nc.openbsd'
    key: 'network_connect_4'
condition: selection

False positives (as the rule lists them)

  • Legitimate administration activities

Tags

  • attack.discovery
  • attack.t1046

MITRE ATT&CK ids this rule names

Related rules

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/auditd/syscall/lnx_auditd_network_service_scanning.yml

Sources and licences

  • SigmaHQ

    "Linux Network Service Scanning - Auditd" by Alejandro Ortuno, oscd.community (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/linux/auditd/syscall/lnx_auditd_network_service_scanning.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: Linux Network Service Scanning - Auditd",
entity page, dataset version ref-2331d2e5da28, updated 2023-09-26T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/3761e026-f259-44e6-8826-719ed8079408 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 3761e026-f259-44e6-8826-719ed8079408, 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.