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My personal security blog is hosted on Notion at: swiftly-detecting.notion.site.

• 👨‍💻 So you want to build an Endpoint Security app?
• 🌎 Endpoint Security client Survey 2023
• Common macOS Data Sources
  • Security Data Sources
• Endpoint Security Internals
  • What makes Endpoint Security Special?
  • The Endpoint Security Daemon
  • The Endpoint Security System DYLIB
  • The Endpoint Security DYLIB
  • Endpoint Security User Space Eventing

• Published: August 3, 2024
• Link: swiftly-detecting.notion.site/ES-Gatekeeper-User-Override

Summary: Apple has introduced a new Endpoint Security (ES) event in macOS 15 Sequoia called ES_EVENT_TYPE_NOTIFY_GATEKEEPER_USER_OVERRIDE, providing insight into Gatekeeper user overrides. This event, emitted by the /usr/libexec/syspolicyd daemon, does not enable authorization, but offers details like file type, path, CD hash, and SHA256 hash for files under 100MB. The event can be leveraged to detect instances where users bypass Gatekeeper restrictions, aiding in incident response and threat detection. Additionally, the ExecPolicy database's policy_scan_cache and settings table can be queried for the last override event by looking to the lastGKOverride value.

• Published: August 2, 2024
• Link: swiftly-detecting.notion.site/Listing-Connected-ES-Clients

Summary: It's possible to enumerate Endpoint Security (ES) clients (those who call into es_new_client(_:_:)) using the I/O Registry. The I/O Registry is a database representing the system's current "hardware" configuration and is organized into eight planes, with the IOService plane being of particular interest. The native ioreg utility can be used to query the EndpointSecurityDriver node, revealing connected ES clients as EndpointSecurityExternalClient objects. Additionally, Apple's IORegistryExplorer.app offers a graphical view of connected clients.