Sigma rule: Interactive Bash Suspicious Children

Rule

Title

Interactive Bash Suspicious Children

Status

test

Level

medium

Author

Florian Roth (Nextron Systems)

Date

2022-03-14

File

rules/linux/process_creation/proc_creation_lnx_susp_interactive_bash.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects suspicious interactive bash as a parent to rather uncommon child processes

Log source

product

linux

category

process_creation

Detection

selection:
    ParentCommandLine: 'bash -i'
anomaly1:
    CommandLine|contains:
        - '-c import '
        - 'base64'
        - 'pty.spawn'
anomaly2:
    Image|endswith:
        - 'whoami'
        - 'iptables'
        - '/ncat'
        - '/nc'
        - '/netcat'
condition: selection and 1 of anomaly*

False positives (as the rule lists them)

• Legitimate software that uses these patterns

Tags

• attack.execution
• attack.stealth
• attack.t1059.004
• attack.t1036

MITRE ATT&CK ids this rule names

• T1036
• T1059.004

References

• Internal Research

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_susp_interactive_bash.yml