sigma-rules/rules/macos/credential_access_credentials_keychains.toml

[metadata]
creation_date = "2020/08/14"
integration = ["endpoint"]
maturity = "production"
min_stack_comments = "New fields added: required_fields, related_integrations, setup"
min_stack_version = "8.3.0"
updated_date = "2023/02/22"

[rule]
author = ["Elastic"]
description = """
Adversaries may collect the keychain storage data from a system to acquire credentials. Keychains are the built-in way
for macOS to keep track of users' passwords and credentials for many services and features such as WiFi passwords,
websites, secure notes and certificates.
"""
from = "now-9m"
index = ["auditbeat-*", "logs-endpoint.events.*"]
language = "eql"
license = "Elastic License v2"
name = "Access to Keychain Credentials Directories"
note = """## Setup

If enabling an EQL rule on a non-elastic-agent index (such as beats) for versions <8.2, events will not define `event.ingested` and default fallback for EQL rules was not added until 8.2, so you will need to add a custom pipeline to populate `event.ingested` to @timestamp for this rule to work.
"""
references = [
    "https://objective-see.com/blog/blog_0x25.html",
    "https://securelist.com/calisto-trojan-for-macos/86543/",
]
risk_score = 73
rule_id = "96e90768-c3b7-4df6-b5d9-6237f8bc36a8"
severity = "high"
tags = ["Elastic", "Host", "macOS", "Threat Detection", "Credential Access"]
timestamp_override = "event.ingested"
type = "eql"

query = '''
process where host.os.type == "macos" and event.type in ("start", "process_started") and
  process.args :
    (
      "/Users/*/Library/Keychains/*",
      "/Library/Keychains/*",
      "/Network/Library/Keychains/*",
      "System.keychain",
      "login.keychain-db",
      "login.keychain"
    ) and
    not process.args : ("find-certificate",
                      "add-trusted-cert",
                      "set-keychain-settings",
                      "delete-certificate",
                      "/Users/*/Library/Keychains/openvpn.keychain-db",
                      "show-keychain-info",
                      "lock-keychain",
                      "set-key-partition-list",
                      "import",
                      "find-identity") and
    not process.parent.executable :
      (
        "/Applications/OpenVPN Connect/OpenVPN Connect.app/Contents/MacOS/OpenVPN Connect",
        "/Applications/Microsoft Defender.app/Contents/MacOS/wdavdaemon_enterprise.app/Contents/MacOS/wdavdaemon_enterprise",
        "/opt/jc/bin/jumpcloud-agent"
      ) and
    not process.executable : "/opt/jc/bin/jumpcloud-agent"
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1555"
name = "Credentials from Password Stores"
reference = "https://attack.mitre.org/techniques/T1555/"
[[rule.threat.technique.subtechnique]]
id = "T1555.001"
name = "Keychain"
reference = "https://attack.mitre.org/techniques/T1555/001/"



[rule.threat.tactic]
id = "TA0006"
name = "Credential Access"
reference = "https://attack.mitre.org/tactics/TA0006/"