Sigma rule: Linux Remote System Discovery

Rule

Title

Linux Remote System Discovery

Status

test

Level

low

Author

Alejandro Ortuno, oscd.community

Date

2020-10-22

Modified

2021-11-27

File

rules/linux/process_creation/proc_creation_lnx_remote_system_discovery.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects the enumeration of other remote systems.

Log source

product

linux

category

process_creation

Detection

selection_1:
    Image|endswith: '/arp'
    CommandLine|contains: '-a'
selection_2:
    Image|endswith: '/ping'
    CommandLine|contains:
        - ' 10.' # 10.0.0.0/8
        - ' 192.168.' # 192.168.0.0/16
        - ' 172.16.' # 172.16.0.0/12
        - ' 172.17.'
        - ' 172.18.'
        - ' 172.19.'
        - ' 172.20.'
        - ' 172.21.'
        - ' 172.22.'
        - ' 172.23.'
        - ' 172.24.'
        - ' 172.25.'
        - ' 172.26.'
        - ' 172.27.'
        - ' 172.28.'
        - ' 172.29.'
        - ' 172.30.'
        - ' 172.31.'
        - ' 127.' # 127.0.0.0/8
        - ' 169.254.' # 169.254.0.0/16
condition: 1 of selection*

False positives (as the rule lists them)

• Legitimate administration activities

Tags

• attack.discovery
• attack.t1018

MITRE ATT&CK ids this rule names

• T1018

References

• https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1018/T1018.md

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_remote_system_discovery.yml