Introduction: Unlocking Digital Traces

In the realm of digital forensics, extracting evidence from mobile devices is paramount. Android devices, due to their widespread use, frequently become subjects of investigation. While physical acquisition offers the deepest data access, logical acquisition – specifically targeting application databases – provides a highly efficient and often sufficient method for recovering specific user data, such as SMS messages and call logs. This guide delves into the process of logically acquiring and forensically analyzing Android’s core messaging and call databases to uncover not only existing records but also potentially deleted entries.

Logical acquisition typically involves accessing data directly from the device’s file system, often requiring root privileges. The core principle for SMS and call log recovery relies on understanding how SQLite databases manage deletions, as records are often merely marked for deletion rather than immediately purged from the database file.

Prerequisites for Logical Acquisition

Before embarking on the data extraction process, ensure you have the following:

• Rooted Android Device: Access to the `/data` partition is restricted without root privileges.
• ADB (Android Debug Bridge): Essential for connecting to the device and executing shell commands.
• SQLite Browser: A tool like DB Browser for SQLite (dbbrowser.org) for viewing and querying database files.
• Basic Understanding of SQL: Familiarity with SELECT queries is helpful.
• Sufficient Storage: To pull database files to your forensic workstation.

Understanding Android SMS & Call Log Storage

Android devices store SMS/MMS messages and call logs in standard SQLite databases within specific application data directories. These databases are crucial forensic artifacts:

SMS/MMS Database: mmssms.db

This database is typically located at /data/data/com.android.providers.telephony/databases/mmssms.db. It contains several tables, but the most relevant for SMS content are:

• sms: Stores individual SMS messages (inbox, sent, draft).
• pdu: Stores raw PDU (Protocol Data Unit) data for MMS.
• threads: Manages conversation threads.

Key columns in the sms table include _id, thread_id, address (sender/recipient), body (message content), date (timestamp), type (inbox/sent/draft), and read (read status).

Call Log Database: calllog.db

The call log database is commonly found at /data/data/com.android.providers.contacts/databases/calllog.db. The primary table of interest here is:

• calls: Stores records of incoming, outgoing, and missed calls.

Important columns in the calls table include _id, number (caller/callee), date (call timestamp), duration (call length in seconds), type (incoming/outgoing/missed), and name (contact name if available).

Step-by-Step Logical Acquisition

Step 1: Verify ADB Connection and Root Access

Ensure your device is connected via USB and ADB is authorized. Confirm root access by attempting a root shell.

adb devicesadb shellsu

If successful, the prompt will change from $ to #.

Step 2: Copy Database Files from Restricted Directory

The database files reside in directories with strict permissions. You often cannot adb pull them directly from `/data`. The common workaround is to copy them to a user-accessible location like `/sdcard` (internal storage) using the root shell, then pull from there.

adb shell

        
        
        

            

                
            
            

                
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