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Suspicious Interactive Shell Spawned From Inside A Container

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Suspicious Interactive Shell Spawned From Inside A Container

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This rule detects when an interactive shell is spawned inside a running container. This could indicate a potential container breakout attempt or an attacker’s attempt to gain unauthorized access to the underlying host.

Rule type: eql

Rule indices:

logs-cloud_defend*

Severity: high

Risk score: 73

Runs every: 5m

Searches indices from: now-6m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References: None

Tags:

Elastic
Host
Linux
Container
Threat Detection
Execution

Version: 1

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

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process where container.id: "*" and
event.type== "start" and

/*D4C consolidates closely spawned event.actions, this excludes end actions to only capture ongoing processes*/
event.action in ("fork", "exec") and event.action != "end"
 and process.entry_leader.same_as_process== false and
(
(process.executable: "*/*sh" and process.args: ("-i", "-it")) or
process.args: "*/*sh"
)

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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