[metadata]
creation_date = "2023/07/28"
integration = ["endpoint"]
maturity = "production"
min_stack_comments = "New fields added: required_fields, related_integrations, setup"
min_stack_version = "8.3.0"
updated_date = "2023/07/28"

[rule]
author = ["Elastic"]
description = """
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.
"""
from = "now-9m"
index = ["logs-endpoint.events.*"]
language = "eql"
license = "Elastic License v2"
name = "Potential Shell via Wildcard Injection Detected"
references = ["https://www.exploit-db.com/papers/33930"]
risk_score = 47
rule_id = "0b803267-74c5-444d-ae29-32b5db2d562a"
severity = "medium"
tags = ["Domain: Endpoint", "OS: Linux", "Use Case: Threat Detection", "Tactic: Privilege Escalation", "Tactic: Execution", "Data Source: Elastic Defend"]
type = "eql"
query = '''
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
'''

[[rule.threat]]
framework = "MITRE ATT&CK"

[[rule.threat.technique]]
id = "T1068"
name = "Exploitation for Privilege Escalation"
reference = "https://attack.mitre.org/techniques/T1068/"

[rule.threat.tactic]
id = "TA0004"
name = "Privilege Escalation"
reference = "https://attack.mitre.org/tactics/TA0004/"

[[rule.threat]]
framework = "MITRE ATT&CK"

[[rule.threat.technique]]
id = "T1059"
name = "Command and Scripting Interpreter"
reference = "https://attack.mitre.org/techniques/T1059/"

[rule.threat.tactic]
id = "TA0002"
name = "Execution"
reference = "https://attack.mitre.org/tactics/TA0002/"