Forensic examination of SQLite Write Ahead Log (WAL) files

I am sure that you are aware that when an SQLite database is opened if there is an associated WAL (Write Ahead Log) file then the pages in this WAL are automatically written to the main database, thus overwriting records, and the WAL file is reset. You may not be aware though that the WAL can contain multiple copies of the same page (each with different data/records) and that there can also be a sort of WAL “slack” i.e. records from a previous database transaction, if you like records from previous WAL files. So by opening the database and committing the WAL you are potentially overwriting/missing valuable evidence.

This article describes how WAL files work and how to deal with them forensically – the steps are very straight forward with the Forensic Toolkit for SQLite and the article takes you through them.I will go into a little detail regarding the format and usage of a WAL file, some of the forensic implications of recovering data and present two methods for recovering the data without missing or overwriting existing records.

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Looking ahead, Alan mentions MSAB's new CEO and hints at some exciting developments coming down the pipeline. He spotlights recent enhancements to XEC Director's speed and database functionality for managing large estates of networked Kiosks. Alan also plugs the new XEC Director training he created to help users fully leverage the platform's capabilities.

00:00 – Introduction to Alan Platt
07:00 – Training
12:00 – Workflows
17:20 – Ensuring a secure environment
19:45 – Customer training
20:35 – Helping customers comply with ISO accreditation
25:00 – Validation and verification
27:30 – ISO standards
30:00 – MSAB’s pipeline plans
32:40 – XEC Director 
43:45 – Privacy of user data

Alan Platt, Professional Services Consultant at MSAB, discusses his experience as a former UK police officer working in digital forensics. He talks about the different levels of digital forensics capabilities within police forces and how MSAB products like XAMN and XEC Director are used by frontline officers versus lab analysts.

The discussion covers how MSAB partners with law enforcement to develop custom workflows for mobile device acquisitions that facilitate ISO compliance. Alan explains MSAB's managed service offering, where approved MSAB staff can remotely access a customer's XEC Director server to assist with software updates and troubleshooting. He emphasizes the strict data segregation policies enforced by customers to prevent MSAB from accessing any sensitive case data.

Looking ahead, Alan mentions MSAB's new CEO and hints at some exciting developments coming down the pipeline. He spotlights recent enhancements to XEC Director's speed and database functionality for managing large estates of networked Kiosks. Alan also plugs the new XEC Director training he created to help users fully leverage the platform's capabilities.

00:00 – Introduction to Alan Platt
07:00 – Training
12:00 – Workflows
17:20 – Ensuring a secure environment
19:45 – Customer training
20:35 – Helping customers comply with ISO accreditation
25:00 – Validation and verification
27:30 – ISO standards
30:00 – MSAB’s pipeline plans
32:40 – XEC Director
43:45 – Privacy of user data

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