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Credentials from Password Stores: Keychain

Description from ATT&CK

Adversaries may acquire credentials from Keychain. Keychain (or Keychain Services) is the macOS credential management system that stores account names, passwords, private keys, certificates, sensitive application data, payment data, and secure notes. There are three types of Keychains: Login Keychain, System Keychain, and Local Items (iCloud) Keychain. The default Keychain is the Login Keychain, which stores user passwords and information. The System Keychain stores items accessed by the operating system, such as items shared among users on a host. The Local Items (iCloud) Keychain is used for items synced with Apple’s iCloud service.

Keychains can be viewed and edited through the Keychain Access application or using the command-line utility security. Keychain files are located in ~/Library/Keychains/, /Library/Keychains/, and /Network/Library/Keychains/.(Citation: Keychain Services Apple)(Citation: Keychain Decryption Passware)(Citation: OSX Keychain Schaumann)

Adversaries may gather user credentials from Keychain storage/memory. For example, the command security dump-keychain –d will dump all Login Keychain credentials from ~/Library/Keychains/login.keychain-db. Adversaries may also directly read Login Keychain credentials from the ~/Library/Keychains/login.keychain file. Both methods require a password, where the default password for the Login Keychain is the current user’s password to login to the macOS host.(Citation: External to DA, the OS X Way)(Citation: Empire Keychain Decrypt)

Atomic Tests

Atomic Test #1 - Keychain

Keychain Files

~/Library/Keychains/

/Library/Keychains/

/Network/Library/Keychains/

Security Reference

Keychain dumper

Supported Platforms: macos

auto_generated_guid: 1864fdec-ff86-4452-8c30-f12507582a93

Inputs:

Name Description Type Default Value
cert_export Specify the path of the certificates to export. Path /tmp/certs.pem

Attack Commands: Run with sh!

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security -h
security find-certificate -a -p > #{cert_export}
security import #{cert_export} -k

source