Applied Cellphone Forensics

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Contents

Applied Cellphone Forensics

• Defining processes of the acquisition, preservation, analysis of evidence

• Presentation of physical and digital cellular phone evidence in the investigation process

• Evidence regulation and its impacts in the investigation process

• Applications: practical forensic cases related to cellular phones

Introduction

Cellular telephones are a ubiquitous consumer device. Over 180 million subscribers are using one of over 500 different cellphones offered in the United States from over 30 different manufacturers, processing voice and data traffic over 4 carrier networks. Invariably, with so much voice and data traffic being sent from one cellphone to another, many of these phones can provide critical evidentiary data to crime scene investigators. Unfortunately, the forensic acquisition and analysis of these phones is a new process in the computer forensics world. Several reasons exist, but the main reasons are the lack of awareness and training of law enforcement agencies. This paper is an effort to change this deficiency.

Processes of the Acquisition, Preservation, Analysis of Evidence

Due to their nature, cell phones are acquired and preserved in the same action. This acquisition and preservation is done with various tools and technologies. It can be done through various cabling systems and various software applications. Examples of the cabling systems include Paraben’s Cell Seizure Toolkit, Susteen’s Law Enforcement Cabling Kit, or the various manufacturers data cables.

The various software applications include:
Paraben’s Cell Seizure
Susteen’s SecureView
BITPim
Nokia’s Oxygen PM Forensic Edition
FloAt's Mobile Agent
iDEN Media Downloader
iDEN Phoenbook Manager
SmartMoto
GSM .XRY
SuperAgent RSS
MobilEdit
Tulp2G
Access Data’s FTK
Guidance Software’s EnCase

SIM Card software applications:
SIM Seizure
SIMCon
Tulp2G


Overly simplified…

Is there a method for determining which application to use based on the phone? Can this be built from a database of knowledge

Process of Cellphone Acquisition.
1. Take phone off network via faraday technology
2. Connect power source and ensure at least 50% charge
3. Connect the data synchronization cable to the phone
4. Launch the software application for acquisition and analysis
5. Acquire the phones image

Process of SIM Card Acquisition.
1. Connect SIM Card to Computer through a compliant card reader
2. Launch the software application for acquisition and analysis
3. Acquire and Analyze the SIM Card

Process of Cellphone Analysis.
What are we looking for:
GSM: IMEI
CDMA: ESN
Short Dial Numbers
SMS Messages
Phone Settings (language, date/time, tone/volume etc)
Stored Audio Recordings
Stored Computer Files
Logged incoming calls and dialed numbers
Stored Executable Programs
GPRS, WAP and Internet settings
Calendar and Contacts
Calls Made, Received, and Missed
Ring Tones, Games, Pictures, Videos and other Downloaded information


Process of SIM Card Analysis.
What are we looking for:
Location Information
SMS Messages
Abbreviated Dialing Numbers
Last Numbers Dialed


Presentation of Physical and Digital Cellular Phone Evidence in the Investigation Process

Cellular Phone
Forensic Evidence Folder Organization
Analog – Screenshots of phones
Digital – Reports from applications
Word Document for binding information together


Evidence Regulation and its Impacts in the Investigation Process

Cellphones are not hard drives
Live versus dead animals

Hard Drives are coming tho: http://itvibe.com/news/3934/

SIM cards are getting bigger too: http://www.vnunet.com/2150531

Applications: Practical Forensic Cases Related to Cellular Phones

Examples???