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Potential Upgrade of Non-interactive Shell

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Potential Upgrade of Non-interactive Shell

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Identifies when a non-interactive terminal (tty) is being upgraded to a fully interactive shell. Attackers may upgrade a simple reverse shell to a fully interactive tty after obtaining initial access to a host, in order to obtain a more stable connection.

Rule type: eql

Rule indices:

logs-endpoint.events.*
endgame-*

Severity: medium

Risk score: 47

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References: None

Tags:

Domain: Endpoint
OS: Linux
Use Case: Threat Detection
Tactic: Execution
Data Source: Elastic Endgame
Data Source: Elastic Defend

Version: 2

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

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process where host.os.type == "linux" and event.action in ("exec", "exec_event") and event.type == "start" and (
  (process.name == "stty" and process.args == "raw" and process.args == "-echo" and process.args_count >= 3) or
  (process.name == "script" and process.args in ("-qc", "-c") and process.args == "/dev/null" and
   process.args_count == 4)
)

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Execution
- ID: TA0002
- Reference URL: https://attack.mitre.org/tactics/TA0002/
Technique:
- Name: Command and Scripting Interpreter
- ID: T1059
- Reference URL: https://attack.mitre.org/techniques/T1059/
Sub-technique:
- Name: Unix Shell
- ID: T1059.004
- Reference URL: https://attack.mitre.org/techniques/T1059/004/

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