Analyzing Prefetch Files for Execution History

When to Use

• When determining which programs were executed on a Windows system and when
• During malware investigations to confirm execution of suspicious binaries
• For establishing a timeline of application usage during an incident
• When correlating program execution with other forensic artifacts
• To identify anti-forensic tools or unauthorized software that was run

Prerequisites

• Access to Windows Prefetch directory (C:\Windows\Prefetch) from forensic image
• PECmd (Eric Zimmerman), WinPrefetchView, or python-prefetch parser
• Understanding of Prefetch file format (versions 17, 23, 26, 30)
• Windows system with Prefetch enabled (default on client OS, disabled on servers)
• Knowledge of Prefetch naming conventions (APPNAME-HASH.pf)

Workflow

Step 1: Extract Prefetch Files from Forensic Image