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Potential Shell via Wildcard Injection Detected

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Potential Shell via Wildcard Injection Detected

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This rule monitors for the execution of a set of linux binaries, that are potentially vulnerable to wildcard injection, with suspicious command line flags followed by a shell spawn event. Linux wildcard injection is a type of security vulnerability where attackers manipulate commands or input containing wildcards (e.g., *, ?, []) to execute unintended operations or access sensitive data by tricking the system into interpreting the wildcard characters in unexpected ways.

Rule type: eql

Rule indices:

logs-endpoint.events.*

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:

https://www.exploit-db.com/papers/33930

Tags:

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

Version: 3

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

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sequence by host.id with maxspan=1s
  [process where host.os.type == "linux" and event.action == "exec" and event.type == "start" and (
    (process.name == "tar" and process.args : "--checkpoint=*" and process.args : "--checkpoint-action=*") or
    (process.name == "rsync" and process.args : "-e*") or
    (process.name == "zip" and process.args == "--unzip-command") )]  by process.entity_id
  [process where host.os.type == "linux" and event.action == "exec" and event.type == "start" and
     process.parent.name : ("tar", "rsync", "zip") and
     process.name : ("bash", "dash", "sh", "tcsh", "csh", "zsh", "ksh", "fish")] by process.parent.entity_id

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Privilege Escalation
- ID: TA0004
- Reference URL: https://attack.mitre.org/tactics/TA0004/
Technique:
- Name: Exploitation for Privilege Escalation
- ID: T1068
- Reference URL: https://attack.mitre.org/techniques/T1068/
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/

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