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馃 Thanatology part 4: Filesystem Forensics with the Exhume ToolKit.

15 min read
k1nd0ne
Digital Forensics Spiderman

This blog post is part of the Thanatology blog post series. If you haven鈥檛 checked it out, I recommend reading the following first:

In the previous part, we discovered how to perform partition discovery for the MBR and GPT layouts. The next step in our digital forensics examination process of a disk image is to identify the type of Filesystem present on a given partition and extract relevant data. In this blog post, we will first dive into the concept of file systems in general. Next, we will explore how the Exhume toolkit is designed to propose a way to understand multiple kinds of file systems and introduce an abstraction module. Finally, some updates on the Thanatology project will be proposed.

馃 Thanatology part 3: MBR and GPT forensics with the Exhume ToolKit.

11 min read
k1nd0ne
Digital Forensics Spiderman

This blogpost is part of the Thanatology blogpost series. If you haven鈥檛 check it out, I recommend reading the following first:

In this blogpost, we will dive into the concepts of GPT and MBR partition schemes and explore them using Exhume Partitions.

馃 Thanatology part 2: Multiple disk images formats handling using the Exhume ToolKit

12 min read
k1nd0ne
Digital Forensics Spiderman

This blogpost is part of the Thanatology blogpost series. If you haven鈥檛 check it out, I recommend reading the following first:

In this blogpost, we will dive into the concepts of disk images and how digital forensics examiners can use the Exhume toolkit to read data transparently from different formats. First, we will give an overview of what is a disk image and describe some of the existing formats one may encounter during a digital investigation. Next, we will explore how Exhume Body is providing an abstraction layer to those formats to read data agnostically.

馃敠 A quick walkthrough in the VMDK format

10 min read
mickaelwalter
Infosec and technology enthousiast

After attending a conference for incident response teams, I joined a project aiming to create a forensic framework allowing acquisition and visualization of evidence from various sources: the Exhume toolkit.

The Exhume Toolkit v0.1

In this quest of retrieving data from various base formats, I got involved in the understanding and implementation of a parser for the VMDK format.

The Virtual Machine Disk format has been created by VMware and is used by all kinds of virtual machines from all types of hypervisors. It is also used in exchange formats used to share virtual machines from one hypervisor to another.

Most IT experts, from cybersecurity to system administrators have heard of VMDK files. And I am no exception. But I never really understood what was behind this format. Sure, I did encounter some difficulties to access data from a VMDK file sourced from and ESXi server but I always found tools allowing to convert the file to a better suited format... Including VMDK itself.

At that moment I wondered why converting a VMDK file to another one could help me get access to the data for forensic purposes. And I've found the answer now I did some serious research on the matter.

馃 Thanatology Part 1 - Introducing the Thanatology project

10 min read
k1nd0ne
Digital Forensics Spiderman

In digital forensics, tools are only as valuable as the investigator鈥檚 ability to understand and explain their output, especially when presenting evidence in court. Beyond simply extracting data, the methodology behind how artifacts are collected and interpreted plays a critical role in admissibility, reliability and credibility.

This blog post series introduces the Thanatology Project, an open-source, cross-platform digital forensics framework currently under development. Built on top of the Exhume ToolKit (a modular set of Rust-based forensic tools), Thanatology combines performance, transparency, and modern design via a Tauri-based desktop interface. Designed for law enforcement and digital forensic professionals, the project emphasizes not only artifact collection and presentation but will also try to provide help for interpretation.

For example, when analyzing EXTFS file systems, Thanatology will try to offers guidance on timestamp meanings and includes complete extraction details suitable for annexing to formal reports.

The blog series will cover:

  • An overview of the Thanatology project and its goals.
  • A high-level introduction to the Exhume tool suite.
  • Deep dives into each Exhume module and its specific forensic use case.
  • Updates on the project development.
  • Interesting research techniques we found during our journey.

While Thanatology is not intended to replace established tools, it will attempt to offers a modular and modern alternative ideal for cross-verifying findings or integrating into custom workflows. This blogpost series is mainly here to provide the community with updates, technical knowledge and any interesting subjects we found along the way.

馃摝 Volatility3 : Import Address Table

5 min read
k1nd0ne
Digital Forensics Spiderman

Windows executable analysis is a key aspect of Digital Forensics and Reverse Malware Engineering. Identifying the capabilities of a program can help to target potential malicious code and orient the later reverse code analysis phase. In this blogpost, we will dive into the structure of the Windows Portable Executable (PE) and how we can extract the imported functions in the context of memory analysis.

馃摝 Volatility3 : Alternate Data Stream Scan

6 min read
k1nd0ne
Digital Forensics Spiderman

Windows executable analysis is a key aspect of Digital Forensics and Reverse Malware Engineering. Identifying the capabilities of a program can help to target potential malicious code and orient the later reverse code analysis phase. In this blogpost, we will dive into the structure of the Windows Portable Executable (PE) and how we can extract the imported functions in the context of memory analysis.

馃摌 Volatility3: Modern Windows Hibernation file analysis

12 min read
k1nd0ne
Digital Forensics Spiderman

In the Digital Forensics ecosystem, the field of memory forensics can help uncover artifacts that can鈥檛 be found anywhere else. That can include deleted files, network connections, running processes, rootkits, code injection, fileless malware and many more.

Microsoft introduced the hibernation feature in Windows 2000, allowing systems to be powered down while preserving their volatile state. This is achieved by saving RAM contents and processor context to a file called hiberfil.sys before shutting down inside the root folder of the filesystem drive. When the computer is turned on again, the system restores the volatile state from the saved file. Hibernation files are valuable for digital forensic professionals as they store temporary data from RAM to non-volatile storage, eliminating the requirement for specialized tools on the target device.

The Hibernation file structure has evolved in time. In this blog post, we will dive into the structure of the modern Windows hibernation file and propose a new translation layer for the volatility3 framework to create a raw memory image from a hibernation file.