PowerShell: Audit Log Security Commands

Key insights

• Audit Log purpose: Audit logs record system and user actions to support incident response and compliance.
  Use logs to trace who did what, when, and how — and to detect suspicious behavior quickly.
• Core PowerShell tools: Use Get-WinEvent for modern Windows event stores, Get-EventLog for legacy logs, wevtutil for low-level export, and AuditPol or Get-AuditPolicy to view and set audit policies.
  Pick the tool that matches your Windows version and task for best performance.
• Querying tips: Filter early and precisely (for example, Get-WinEvent -FilterHashtable @{LogName='Security'; ID=4624; StartTime=(Get-Date).AddDays(-1)}) to reduce load and speed results.
  Use time ranges, LogName, and Event ID filters to make searches efficient and reliable.
• Event IDs to monitor: watch for 4624 (successful logon), 4625 (failed logon), 1102 (audit log cleared), 4688 (process creation), and 4672 (privileged logon).
  These events often indicate account misuse, lateral movement, or tampering.
• Best practices: Run queries with administrator rights, enable the right audit categories (logon, object access, policy changes), set retention and protection so logs cannot be overwritten, and forward critical events to a centralized SIEM or safe store.
  Protect logs from unauthorized modification and monitor for log-clearing activity.
• Remote collection & export: Use Invoke-Command or the -ComputerName parameter to collect logs remotely; export results with Export-Csv or Export-Clixml for analysis and archival.
  Secure exported files, avoid clearing source logs, and automate retention and alerting for faster response.

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