What is a service or process log?¶
A service or process log records activity produced by a background service, running process or software component.
These records often explain how a system functioned even when no person was directly interacting with it.
Avoid this assumption: That every process-log entry represents a deliberate action by the user logged into the device. It may not involve a user at all.
Services and processes can start automatically when a device boots, run on a schedule, respond to network requests or perform maintenance in the background. Logs may record startup, shutdown, errors, jobs, file access, network connections, commands and status changes.
An entry may include the service or process name, process identifier, account context, action, result, host and timestamp. This can help establish that a component was running, attempted a task or encountered an error.
But process names can be misleading. Legitimate and malicious software may use similar names. A service may run under a powerful system account even though no administrator personally initiated the activity. A process identifier is temporary and may be reused after a restart.
Investigators should identify the software component, executable path, version and configuration. Ask whether the process was launched manually, by another process, by a scheduler or at system startup. Preserve command lines, parent-child process relationships, service settings and linked endpoint records where available.
A log showing that a task started does not prove it completed. An error does not necessarily mean the wider service failed. Correlate significant entries with system, endpoint, application, network and file-system evidence.
Where malicious execution is suspected, process ancestry, hashes, signing information and forensic examination may require specialist interpretation.
Operational takeaway¶
A service or process log records what a software component reported about its operation, but it does not automatically prove human initiation, successful completion, legitimacy or personal attribution.