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. The actual process of the virtual acquisition of the phone depends very much upon the manufacturer and model of the phone. Usually, a visit to one of the phone carriers’ outlet location can provide you with the information detailing the specifics of the phone. However, in a worst case scenario, removing the battery out from its compartment usually will provide you with the manufacturer name and specific model number. Once the phone is identified, either through known identification or through other aforementioned means, more information can be gleaned about the phones technical specifications and capabilities by visiting the PhoneScoop (www.phonescoop.com) website. Off Network The phone should be taken off of the wireless network. Doing such protects the evidence in several ways. It disallows the erasure stored messages and stored incoming calls. Usually these sources of evidence are stored in cyclic memories, allowing only the most recent number of calls to be stored. Powered up To ensure a good evidence acquisition, a cellphone should have at the very least at 50% charge. Ideally, when the phone is seized, the power cable will also be seized. If not, a trip to phone carrier’s outlet location will usually provide the correct power source. There are other options as well, such as the PowerPod from EarHugger.com which will allow for multiple power sources (AC, DC, USB , Auto) and multiple power tips. Cables Once identified, taken off the network and powered up, the phone is ready for the next step of the virtual acquisition. This 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 specific manufacturers’ data cables. Once the proper cable is connected to the phone and the forensic computer, acquisition can commence.


Application Audiovox LG Motorola Nokia Samsung Sanyo Siemens Sony-Ericsson Toshiba Paraben Cell Seizure X X X X X X Susteen SecureView X X X X X X BITPim X X X X Nokia OxygenPM Forensics Edition X X Float’s Mobile Agent iDEN Media Downloader iDEN Phonebook Manager SmartMoto GSM.XRY SuperAgent RSS MobilEdit Tupl2G


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
ProjectaPhone.com

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???


References

Ayers, R., Jansen, W. (2005) Cellular Phone Forensics. NIST

Paraben Forensics Cell Seizure v3.0. (n.d.). Retrieved Feb. 12, 2006 from http://www.paraben-forensics.com/catalog/product_info.php?cPath=25&products_id=311

Nokia Oxygen Phone Manager II Version 2.8.7. (n.d.). Retrieved Feb 12, 2006 from http://www.opm-2.com/Forensic/

Susteen Secure View (n.d.). Retrieved Feb. 12, 2006 from http://www.susteen.com/lawenforcement.htm