Master artifact identification in Windows environments. This simulation trains investigators to recognize the correct file structures and locations associated with specific browser activity evidence.

CHFI (312-49) Digital Forensics Simulation

Investigation Scenario

You are investigating a corporate Windows 10 workstation (Asset ID: CHI-WS-094) belonging to a user suspected of exfiltrating proprietary blueprints to a competitor. The network firewall logs indicate suspicious outbound traffic to a known webmail provider over HTTPS, but payload inspection was unavailable.

To establish intent and method, you need to extract the local web browsing history to map the user's timeline of activity prior to the incident window.

Evidence Collected

A physical bit-stream image of the workstation's primary storage drive was acquired via a write-blocker.

Acquisition File: Image_CHI-WS-094.E01
OS: Windows 10 Pro (Build 19045)
Target Path: C:\Users\jdoe\AppData\Local\Microsoft\Windows\WebCache\
Status: Extracted logically from E01 image for artifact parsing.

Question

During a forensic examination of a Windows workstation in Chicago, an analyst is looking for evidence of a user's web browsing activity. Which file in the user's profile folder contains the Internet Explorer/Edge (legacy) browsing history?

A. WebCacheV01.dat

B. History.db

C. index.dat

D. places.sqlite

Forensic Hint: Microsoft transitioned away from the proprietary binary format used in older versions of IE (IE9 and below) to an Extensible Storage Engine (ESE) database format starting with IE10. Look for a `.dat` file associated with this cache structure.

Expert Analysis

1. What evidence shows: The OS is Windows 10. The evidence path extracted is \AppData\Local\Microsoft\Windows\WebCache\. This specific directory structure is the default location for the Extensible Storage Engine (ESE) database utilized by Internet Explorer 10+ and the legacy version of Microsoft Edge.

2. Identify forensic stage: Examination & Analysis. The analyst has already collected the image and is now identifying and parsing specific artifacts to reconstruct user activity.

3. Why correct answer is correct: A. WebCacheV01.dat is an ESE (Extensible Storage Engine) database file. Starting with Internet Explorer 10, Microsoft replaced the older `index.dat` structure with this ESE database to store browsing history, cache records, and cookie metadata.

4. Why others are wrong:
• History.db: This is typically an SQLite database used by Google Chrome and other Chromium-based browsers.
• index.dat: This was the repository for history/cache in legacy Windows environments running Internet Explorer 9 or older.
• places.sqlite: This is the SQLite database utilized by Mozilla Firefox to store bookmarks and browsing history.

5. Real-world forensic action: The investigator would export `WebCacheV01.dat` along with its associated transaction logs (`.log`, `.jrs`, `.chk`) from the image. Because it is a dirty ESE database, the logs must be committed to the database (or parsed dynamically) using specialized tools like ESEDatabaseView, Autopsy, or Magnet AXIOM to extract the structured URL visits and UTC timestamps.

6. MINI LESSON: Browser Artifact Evolution
Digital forensics requires constant updating of artifact knowledge.

IE 9 and earlier: Used proprietary `index.dat` files.
IE 10 / Legacy Edge: Transitioned to ESE databases (`WebCacheV01.dat`).
Modern Edge / Chrome / Firefox: Rely heavily on SQLite databases (`History`, `places.sqlite`).

Always verify the OS build and installed browser versions during the Identification phase, as this dictates the extraction tools and parsing scripts you will deploy in the Analysis phase.

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