IPhone Digital Forensic Challenges and Issues

Prepared by the researche

• Dr. Mokhtar Mohammed Mohammed Ali    – University of Elimam Elmahdi- faculty of Computer Science and Information Technology – Sudan – White Nile State –Kosti Email:mokhtar201328@gmail.com
• Dr. Mahala Elzain Beraima Ahmed – University of White Nile – faculty of Computer Science and Information Technology – Sudan – White Nile State –Kosti Email:mahalaelzain2020wnu@gmail.com

Democratic Arabic Center

Journal of cultural linguistic and artistic studies : Thirty-third Issue – September 2024

A Periodical International Journal published by the “Democratic Arab Center” Germany – Berlin

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ABSTRACT

Nowadays mobile phone and other handheld devices are in all the places. iPhone is having high security when compared to other Smartphone like MI, Samsung, Nokia, etc. With the continued to increase iPhone, currently come with a wide range of software application, new technologies, and OS (Operating System). Therefore it becomes complicated for a forensic researcher to inspect the (evidence) proof from an iphone proper intelligence of forensic equipment and their features are mobile forensic analysis and different types of equipment for mobile forensics and the final section of the manuscript presents the exploratory results of the tool IMYFONE D-BACK.

1. INTRODUCTION

“Digital forensics is a division of forensic science focused on recovery and analysis of artifacts found on digital devices. Any equipment that storing data (E.g. Macintosh, Macbook, iPhone, Flash drives, Micro SD cards or External Hard-Disks) are within the ambit of digital forensics” [15].

Today’s Smartphones such as the Apple iPhones [17] and a bulk variety of smartphone [18] are compact forms of powerful computers with high work involving nearly a Multi-core CPUs, GB of storage, and improved communication facilities such as software assisted GPS. As new features and applications are integrated into Smartphone amount of data stored on the devices is always growing. Smart application business has twisted the Smartphone into handy data carriers, and they keep follow of almost all moves of the user. Prevalence of Smartphone in everyday lives had led to their popularity in daily crimes. Thus the digital information acquired from smart devices has become one of the prime sources of proof for investigating the problems pertained to data acquisition.

In this context, the term “Smart Devices” refers to a broad spectrum of devices which have communication facilities and storage facility for digital data. There are international guidelines for the acquisition and examination of smart devices that are primarily targeted towards the preservation and non-contamination of digital data in smart devices.

The best instance of Smartphone used as a terror missile to finish the crime is the Mumbai terrorist ambush in 2008 [20]. The terrorist has taken the full benefit of being a part of the Smartphone generation. They connected electronically through smartphones to each other and with their controllers at every stage of their operation. This attack is not the first time that Smartphone are used, but the way they were performed is important and revealing. In such cases, a large amount of data can be extracted and used as forensic proof from these devices. The mobile devices evolved at an explosive rate. There are many hardware and software components used in this industry. The data quantities which can be stored on modern mobile devices are enormous. Application specific data may be stored on mobile devices. The investigation method and tool used to communicate with the mobile device can often invalidate the proof in court because it can affect the integrity and repeatability of the proof [5]. Forensically sound is the terms used to approve the use of specific forensic technology or methodology in the digital forensic circles.

The fundamental concept of sound forensic examination of digital proof is that the original proof is not altered. With mobile devices, this is extremely difficult. Most forensics required a duplex channel of communication with the mobile device and therefore the device cannot be protected against writing during forensic acquisition. Other methods of acquiring proof may include replacing the bootloader software on the mobile device or replacing a chip to facilitate access to proof.

When changing the device, the process and the resulting change need to be validated and documented. As with any collection of proof, failure to follow the proper procedure during the examination may lead to the loss or damage to proof or make it as inadmissible in court. All these challenges makes difficult to use digital forensic analysis tools on mobile devices. It should be noted that ISO 27037 specification “Detection, collection and/or acquisition and preservation guidelines for digital evidence” (2012) defines methods and techniques accepted in many jurisdictions in digital forensics [12].

2. SMARTDEVICES & PROOF PRESERVATION

The collection of proof at the crime site shall include the preservation of the state of the devices:

1. A switched ON device must be kept on
2. It must be protected from external WiFi signals while maintaining the state of the WiFi status of the phone.
3. It should be isolated from telecommunication signals (like 4G, LTE, etc.)
4. GPS signals must be isolated.
5. IT battery should be charged (preferably at the same level of the battery)

If a mobile device on a crime site is not isolated from all such factors listed above, it will become very easy for the attacker to gain access to the device and lock or destroy all proof in it. This is usually done the facilities provided by the iphone, such as iOS from Apple. Figure 1 Shows how easy it is for the owner (the criminal in this case) to remotely locate, access, lock, and delete a typical iPhone.

Fig 1: Remotely Track and erase iPhone with iCloud

3. WORKFLOW

Fig 2: Workflow of mobile forensics

The digital forensic of iPhone process (Based on the Figure 2) can be divided into several categories,

3.1. CAPTURE, ISOLATE AND IDENTIFY

At the time of the seizure, it is important to document with photos the various mobile state information –including not to the current (on or off) and the locking status, presence or absence of Memory Cards, etc. All hardware and software accessories including cables, chargers, subscriber identity module (SIM) card data, personal identification number (PIN) hints or passwords are collected as well. As already shown, it is essential to protect the device from communicating with external agencies-including phone calls (but not limited to), short message service (SMS), Wireless Fidelity (WiFi), Bluetooth and Global Positioning System (GPS).

During the collection of proof, a phone call or SMS or an email may overwrite the previous ones. An iPhone which can be accessed via the internet can easily be remotely wiped. Thus, the following equipment, such as a faraday bag and/or radio jammer, must be used to prevent all electromagnetic communication with the device. Phone features such as “Airplane mode” can also be used many times to prevent radio communications to foreign countries. Functions such as “stay awake” can also be used to keep the iPhone unlocked (display turned on).

3.2. ACQUISITION OF PROOF

Data extraction from SIM requires hardware tools such as PC/SC Reader that acquires GSM 11.11 data on the device’s internal memory (E.g. a Memory Chip) can be copied bit by bit from a whole physical store. This allows the deleted files and any remaining data to be examined, which would otherwise not be accounted for. The other copying method for logical entities such as files and directories may prove to be a simpler method during the examination. There are various software tools for extracting data from the memory.

Specialized forensic software products can be automated or generic file viewers, like hex editors, are available. Some specialist tool includes access the data for memory image analysis. Since one tool cannot extract all the information, it is often recommended that two or more tools be used. When the acquisition becomes more forensically sound, tools become more costly, analyses are longer and tools require more training.

• REVIEW, ANALYSIS AND REPORTING

1. Logical acquisition: A bitwise copy of logical storage objects such as directories and logical storage files (E.g. A partition of the file system).
2. Manual acquisition: This method uses the mobile User Interface (UI) to scan the contents of the iPhone’s memory.
3. Metadata acquisition of the system file: When user data is organized in a database, it is called META data. Such META databases may provide valuable information on the use of the device; E.g. Call is a simple SQLite database file in iOS.
4. Physical acquisition: It is the binary dump of the entire file system. This may contain information on existing or deleted system file objects.
5. Acquisition of brute: it is used to extract passwords or PINs. Brute force tools are connected data as a password or PIN until successful. It takes time but often depends on the complexity of the original password or PIN.

On iPhone’s, the acquisition of proof is greatly simplified once the IMYFONE D-(IMDB) with iTunes is enabled. This option is probably the best tool for the forensic surveyor when extracting data from an iOS, without affecting or altering the telephone status. You can find this option in settings development of nearly all iPhones.

iOS software development kit (ISDK) includes [19] this powerful IMDB tool to communicate via USB and WiFi with the IMDB-enabled iPhone. Most of the above information can be accessed from the desktop of the investigator using IMDB. Please note that 99 percent of IMDB’s Features can be used to access the iphone without root, making IMDB one of the best tools for collecting and analyzing iPhone forensic as shown in Figure 3a, 3b.

Fig 3a: User Interface of IMDB

Fig 3b: Recover options in IMDB

FEATURES IN IMDB

IMDB is the best tool for forensic analysis.

1. Recover from iOS device

This mode can be used to recover the recently deleted data from the iOS devices Via USB device as shown in Figure 4.

Fig 4: Recover data from iOS device in IMDB

2. Recover from iTunes backup

This mode can be used to recover the recently deleted data from the iTunes via cloud with high probability as shown in Figure 5.

Fig 5: Recover data from iTunes in IMDB

3. Recover from iCloud backup

This mode can be used to recover the recover the recently deleted data from the iCloud with high probability as shown in Figure 6.

Fig 6: Recover data from iCloud in IMDB

6. FIX iOS SYSTEM

Fix various iOS issues & get your devices to normal with the help of IMDB as shown in Figure 7.

Fig 7: Fix iOS device issues in IMDB

1. Standard mode

Fix the white/black screen, device stuck on apple logo/recovery mode, restarting loops, iTunes errors, bricked iOS devices, freezing screen, not turning on and more without data loss.

1. Exit recovery mode

Quick fix iOS mode if you forgot the password for screen lock, or you fail to fix iOS issues with standard mode.

iii. Advanced mode

Choose this mode if you forgot the password for screen lock, or you fail to fix iOS issues with standard mode.

RESULT AND ANALYSIS

Once proof is acquired (as described above in many forms), the following are the most common logical entities which are the potential proof source in a mobile device. i.e. These are the possible logical entities to be investigated in a mobile device as shown in Figure 7a, Figure 7b, Figure 7c, Figure 7d, figure 7e, Figure 7f, Figure 7g, Figure 7h, Figure 7i, Figure 7j, Figure 7k, Figure 7l, Figure 7m, Figure 7n.

Two types of forensic investigations are possible with the proof data.

1. A crime has already taken place and the identity of the criminal (E.g. hacking incident) is unknown.
2. The crime and the criminal are both known (E.g. child pornography investigation).

Fig 7a: Connecting iPhone in IMDB

Fig 7b: Establishing Connection between iPhone & IMDB

Fig 7c: Recoverable data’s from iPhone 5s

Fig 7d: Data recovering from iPhone

Fig 7e: Message history

Fig 7f: Call history

Fig 7g: Available Contacts

Fig 7h: Whatsapp Message

Fig 7i: Whatsapp Attachments

Fig 7j: Available & Deleted Whatsapp attachment Photos

Fig 7k: Available & Deleted Whatsapp attachment Videos

Fig 7l: Available & Deleted Whatsapp attachment Audios

Fig 7m: Available and deleted Calendar details

Fig 7n: Safari history

Prepared against the background of the incident and the proof collected [6], the forensic expert can pursue the following goals:

1. Who all are involved: collect information of the people involved in crime.
2. What is the nature of the events?
3. When did the crime-related events occur?
4. Why did the delinquent commit the offense?
5. What are the tools and methods used by offenders to carry out the offense?

CONCLUSION

Mobile forensic is the digital forensic branch that acquires and analyses mobile devices to detect and retrieve digital proof. We have studied forensic literatures using iPhone and identified the methods and studies carried out in this field, regardless of the types of the system used and the few tools already in common use. In this paper, we identified the mobile forensic workflow and the methods for acquiring and documenting proof for future use. 

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