It goes without saying that the expert will understand the scientific basis of the testing that was done. However, even the most educated and experienced persons have gaps in their knowledge and experience. In most cases, what you don’t know will have no effect on the outcome of a trial.
Boot loaders are currently considered the most forensically sound physical extraction...
A key factor in placing any person at the scene of a crime is obtaining evidence that can...
Because of the newness of network forensic activity, network examiners are often left to use existing and emerging tools that have not yet faced the challenge of being proven valid in court. In some respects, the presentation phase of a digital investigation is the most critical; regardless of what has been found, it is worthless if the information cannot be convincingly conveyed to a judge and jury.
One should not expect to find all user information sitting in the default folder or default location for a given type of file (e.g. Application Data or similar folder). Searching the entire hard disk is required in order to locate all unencrypted log and history files.
First responders must use caution when they seize electronic devices. Improperly accessing data stored on electronic devices may violate Federal laws, including the Electronic Communications Privacy Act of 1986 and the Privacy Protection Act of 1980. First responders may need to obtain additional legal authority before they proceed.
Over the years, cookies have been overlooked in forensic examinations. For the most part, cookies were used to show that a user account had accessed a website. Since no set structure for cookies existed, determining the content’s meaning was problematic. With the advent of Google Analytics (GA) cookies, that has changed.
One important basic concept to grasp is working with character classes, or sets. A character class performs a search and matches only one character out of a choice of several.
Triaging a computer can be a methodology to avoid many issues inherent with “pulling the plug.” For instance, capturing the system volatile information can very quickly provide investigators valuable information.
Digital forensic science is not a matter of recovering a file that proves somebody’s guilt; it is about wading through hundreds of thousands, possibly millions, of a wide variety of digital artifacts and making very pointed critical judgments about which provide some sort of inculpatory or exculpatory evidence relevant to the case.
Realistically, Live RAM analysis has its limitations, lots of them. Many types of artifacts stored in the computer’s volatile memory are ephemeral. While information about running processes will not disappear until they are finished, remnants of recent chats, communications, and other user activities may be overwritten with other content any moment the operating system demands yet another memory block.
There is clearly a difference in the type of investigations and examinations being performed versus what are encountered in the public sector. The private sector examiner can be expected to provide evidence to private attorneys, corporations, private investigators, and corporate security departments.
Let’s be very clear before we go down the flasher box path, there is no replacement or substitute for the automated forensic tools produced by mobile forensic manufacturers. Unfortunately, with growing consumer demand for newer and more technologically advanced mobile phones, these automated and safe solutions do not meet some investigative requirements.
Solid-state drives represent a new storage technology. They operate much faster compared to traditional hard drives. SSD drives employ a completely different way of storing information internally, which makes it much easier to destroy information and much more difficult to recover it.
Network investigations can be far more difficult than a typical computer examination, even for an experienced digital forensics examiner, because there are many more events to assemble in order to understand the case and the tools do not do as much work for the examiner as traditional computer forensics tools.
The premise that an effective digital forensic examiner must be able to validate all of the tools that he or she uses is universally accepted in the digital forensic community. I have seen some less-educated members of the community champion a particularly insidious, and I will argue, invalid method of tool validation, often referred to as the two-tool validation method.
The Bring Your Own Device (BYOD) phenomenon is affecting forensic data acquisition because it creates crossover between data that is controlled by an individual versus by a company. People are using their personal devices for work-related tasks because it can seem easier than trying to use typical work resources.
What happens when a smartphone is locked and unsupported by forensic tools? Flasher box, JTAG, or chip-off extraction methods become necessary. All three enable physical extraction — a logical examination cannot be performed on an unsupported locked device. However, even this capability can be limited.
Boot loaders are currently considered the most forensically sound physical extraction method. While they do involve loading a piece of code onto the device, this happens before the forensic tool accesses any evidentiary data.
For the digital crimes of today, specialists need to examine a much more complex environment. Investigators need to image digital media of a multitude of types: magnetic, solid-state, or optical, for example.
Apps, not just available for iPhone or Android but also through device vendors like Samsung, Nokia, and LG — as well as from mobile carriers like T-Mobile and retailers like Amazon — are a digital forensics challenge.
Prepaid phones have been a problem for some time, and continue to be a problem for law enforcement in particular.
The term metadata is sometimes defined with the abstract expression: “data about data.” When any data is defined, described, or created, it can always be characterized in terms of similarities, structure, or related data.
There are multiple techniques for comparing the code of two binaries, where none or only partial source code is present. A trivial way is to use a binary diffing utility. This utility is used in a similar way as plaintext code comparison listing.
Each social media platform is different, with unique code and variations. Each one runs on its own hardware and software platform, and some, such as Facebook, have even developed custom technology to run their sites. Because of that, each requires its own method of forensically collecting data.
Vendors and operating systems can vary widely, particularly with Android, but also even within iOS and BlackBerry user groups. More than 40 iOS versions are commercially available, and are spread among six different iPhones, five iPads, and five iPod Touch devices.
Once a password has been bypassed, an investigator has full access to the computer, allowing them to gather any evidence necessary, including the contents of the DRAM in the system. You can then use a PCI Express or ExpressCard device for memory acquisition.
In today’s world of social media, investigators are taking on a new role; they are becoming a form of eyewitness. As the eyewitness, an investigator observes evidence that might not be visible to any other available investigator. The investigator is wise to create a record of what he or she sees at any particular point in time, including print outs of screenshots.
- Page 1