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The 'customer compiled editions' are also model-specific ROMs. In general, the ROM-level updates applied to each wireless device will contain operating and system basic applications that work for a particular hardware device, for a given vendor (for example your Samsung S7 from Verizon), and for a particular implementation. Even though there is no 'silver bullet' solution to investigating any Android device, the forensics investigation of an Android device should follow the same general process for the collection of evidence, requiring a structured process and approach that address the investigation, seizure, isolation, acquisition, examination and analysis, and reporting for any digital evidence. When a request to examine a device is received, the DFI starts with planning and preparation to include the requisite method of acquiring devices, the necessary paperwork to support and document the chain of custody, the development of a purpose statement for the examination, the detailing of the device model (and other specific attributes of the acquired hardware), and a list or description of the information the requestor is seeking to acquire. Unique Challenges of Acquisition Mobile devices, including cell phones, tablets, etc., face unique challenges during evidence seizure.
Since battery life is limited on mobile devices and it is not typically recommended that a charger be inserted into a device, the isolation stage of evidence gathering can be a critical state in acquiring the device. Confounding proper acquisition, the cellular data, WiFi connectivity, and Bluetooth connectivity should also be included in the investigator's focus during acquisition. Android has many security features built into the phone. The lock-screen feature can be set as PIN, password, drawing a pattern, facial recognition, location recognition, trusted-device recognition, and biometrics such as finger prints. An estimated 70% of users do use some type of security protection on their phone.
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Critically, there is available software that the user may have downloaded, which can give them the ability to wipe the phone remotely, complicating acquisition. It is illegally during the seizure of the mobile device that the screen will be unlocked. If the device is not locked, the DFI's examination will be easier because the DFI can change the settings in the phone promptly. If access is allowed to the cell phone, disable the lock-screen and change the screen timeout to its maximum value (which can be up to 30 minutes for some devices).
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Keep in mind that of key importance is to isolate the phone from any Internet connections to prevent remote wiping of the device. Place the phone in Airplane mode. Attach an external power supply to the phone after it has been placed in a static-free bag designed to block radiofrequency signals. Once secure, you should later be able to enable USB debugging, which will allow the Android Debug Bridge (ADB) that can provide good data capture.
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While it may be important to examine the artifacts of RAM on a mobile device, this is illegally to happen. Acquiring the Android Data Copying a hard-drive from a desktop or laptop computer in a forensic-sound manner is trivial as compared to the data extraction methods needed for mobile device data acquisition.
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