![]() timesync files – Binary files containing timestamp metadata associated with a log entry.UUID files – Binary files containing metadata for a log entry.tracev3 files – Binary files containing the log entries. ![]() The Unified Logs are composed of three components: ![]() With the release of macOS 10.12 (Sierra) in 2016, Apple replaced the ASL with a new proprietary format called the Unified Logging System, which centralized the storage of log data in memory and on disk. What are the Unified Logs?īefore the Unified Logs, the primary log source for macOS systems was the Apple System Logs (ASL) and other plaintext logs residing on the endpoint. Along with this blog post, we also released a tool called “ macos-unifiedlogs " to help overcome some of the challenges in parsing log data, and to provide examples of how it can uncover vital information during an investigation. In this blog post, we will cover an overview of the Unified Logs and the challenges presented in using them during an investigation. These logs can provide forensic investigators a valuable artifact to aid in investigating macOS systems or other Apple devices. This new logging system replaced common Unix logs with macOS Unified Logs.
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