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Access to Keychain Credentials Directories

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Access to Keychain Credentials Directories

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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 Wi-Fi passwords, websites, secure notes, and certificates.

Rule type: eql

Rule indices:

auditbeat-*
logs-endpoint.events.*

Severity: high

Risk score: 73

Runs every: 5m

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

Maximum alerts per execution: 100

References:

Tags:

Elastic
Host
macOS
Threat Detection
Credential Access

Version: 6

Rule authors:

Elastic

Rule license: Elastic License v2

Investigation guide

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## Config

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.

Rule query

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process where 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"

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Credential Access
- ID: TA0006
- Reference URL: https://attack.mitre.org/tactics/TA0006/
Technique:
- Name: Credentials from Password Stores
- ID: T1555
- Reference URL: https://attack.mitre.org/techniques/T1555/
Sub-technique:
- Name: Keychain
- ID: T1555.001
- Reference URL: https://attack.mitre.org/techniques/T1555/001/

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