M365 – Baker Street Forensics

Book Review: Cloud Forensics Demystified

Forensic Imaging, Forensics, M365, Malware, Memory Analysis, RAM, Triage

At this point, we’ve all heard the expression ‘There is no cloud; It’s just someone else’s computer.’ While there is some truth to that, there are some fundamental differences when it comes to digital forensics when cloud resources are part of the investigation.

Recently, I had the chance to read Cloud Forensics Demystified: Decoding cloud investigation complexities for digital forensic professionals, by Ganesh Ramakrishnan and Mansoor Haqanee. I received a complimentary this book in exchange for an honest and unbiased review. All opinions expressed are my own.

I’ve been doing DFIR for about 15 years now. In the early days, almost all investigations involved having hands on access to the data or devices being investigated. As I moved into Enterprise Incident Response, it became more and more frequent that the devices I would be investigating would be in a remote location, be it another state – or even another country. As the scope of my investigations grew, so did my techniques need to evolve and adapt.

Cloud Forensics is the next phase of that evolution. While the systems under investigation may still be in another state or country, extra factors come into play like multi-tenancy and shared responsibility models. Cloud Forensics Demystified does a solid job of shedding light on those nuances.

The book is divided into three parts.

Part 1: Cloud Fundamentals
Part 2: Forensic Readiness: Tools, Techniques, and Preparation for Cloud Forensics
Part 3: Cloud Forensic Analysis: Responding to an Incident in the Cloud

Part 1: Cloud Fundamentals

This section provides a baseline knowledge of the three major cloud providers, Amazon Web Services (AWS), Google Cloud Platform (GCP) and Microsoft Azure. It breaks down the different architectural components of each, and how the platforms each handle the functions of virtual systems, networking and storage.

Part 1 also includes a broad yet thorough introduction to the different Cyber and Privacy legislation that come into play for cloud investigations. This section is not only valuable to investigators. Whether you’re a lawyer providing legal counsel for an organization, or responsible for an organizations overall security at a CISO level, this material is beneficial in understanding the challenges and responsibilities that come from hosting your data or systems in the cloud, and the different legislation and regulations that follow those choices.

Part 2: Forensic Readiness: Tools, Techniques, and Preparation for Cloud Forensics

As with enterprise investigations, logging is often where the hunting for incident indicators begins with telemetry and the correlation of different log sources. This section focuses on the different log sources available in AWS, GCP, and Azure. It also provides a detailed list of log types that are enabled by default and those that require manual activation to ensure that you have access to the most relevant data for your investigations when an incident occurs. This section also covers the different providers offerings for log analysis in the cloud including AWS Cloud Watch, Microsoft Sentinel and Google’s Cloud Security Command Center (Cloud SCC) as examples.

Part 3: Cloud Forensic Analysis: Responding to an Incident in the Cloud

As an Incident Responder, this was the section I enjoyed the most. While the first two sections are foundational for understanding the architectures of networking and storage, part three provides detailed information on how to acquire evidence for cloud investigations. The section covers both log analysis techniques as well as recommendations for host forensics and memory analysis tools. The book covers the use of commercial forensic suites, like Magnet Axiom, as well as open-source tools like CyLR and HAWK. Besides covering investigations of the three Cloud Service Providers (CSPs), there is also a section covering the cloud productivity services of Microsoft M365 and Google Workspace, as well as a brief section on Kubernetes.

Summary

Whether you’re a gray-haired examiner like me, or a neophyte in the world of digital forensics, chances are high that if you’re not running investigations in the cloud yet – you will be soon enough. Preparation is the first step in the Incident Response lifecycle. To properly prepare for incidents you need to know both what sources will be most informative to your investigations, as well as the methodology to capture and process that evidence efficiently.

Cloud Forensics Demystified is a comprehensive guide that covers cloud fundamentals, forensic readiness, and incident response. It provides valuable insights into cloud investigation techniques, log analysis, and evidence acquisition for major cloud providers and productivity services. The book is valuable for both experienced and novice digital forensics professionals to prepare for cloud investigations.

Ginsu: A tool for repackaging large collections to traverse Windows Defender Live Response

DFIR, M365, PowerShell, Triage

Enterprise customers running Windows Defender for Endpoint have a lot of capability at their fingertips. This includes the Live Response console, a limited command shell to interact with any managed Defender assets that are online. Besides its native commands you can also use the console to push scripts and executables to endpoints.

Note: there is a specific security setting in the Defender console if you want to allow unsigned scripts.

Microsoft has its own triage package capability, but you can also push your own tools like Magnet RESPONSE or KAPE. With a little bit of PowerShell mojo you can use your favorite collection utilities using the Defender Live Response console as your entry point into the remote asset.

The console enables you to pull back files from the remote endpoint, even when it’s been quarantined. One limitation of this console function is that you’re limited to retrieving files of 3GB or less.

For many triage collections this could be under the limit, but depending on the artifacts you’re collecting you might exceed that. So what do you do when you have an isolated endpoint but you need to pull back files over 3GB? That’s where Ginsu comes in.

Ginsu is a PowerShell script that you can upload to your Defender console along with the command line version of 7zip. You configure the script with the directory with the contents you want to transfer. The script acts as a wrapper for 7zip and will create a multipart archive, splitting the files into 3GB segments.

Once you pull the archives back to your workstation, you can use 7zip to extract the files back into their original properties.

In testing, the file transfer capabilities were a bit buggy, whether it was transferring 3GB Ginsu files or other smaller files from the asset. I’m hoping this improves as the Defender console matures. If you’re able to text Ginsu in your environment, I’d love to hear how it performs.

You can download Ginsu from my GitHub repo at https://github.com/dwmetz/Ginsu

Huntress CTF: Week 3 – M Three Sixty Five

CTF, DFIR, M365

This is a multipart challenge. All the flags can be found within the live Microsoft 365 instance that we’ll ssh into.

The clue is street address. I’m not too fluent in the capabilities of AADInternals, so the first thing I do is head over to the documentation.

If I do a search on ‘street’ I see that it’s part of an Output example for Get-AADintTenantDetails

Ok, let’s give that command a go.

And there’s the flag under the street value.

For the next one, It not so subtly says that Conditional Access Policies will be part of this, so again we reference the docs. Get-AADIntConditionalAccessPolicies seems like a good candidate.

Two for two.

Microsoft Teams will be our focus on the third one. There’s dozens of Teams commands available within AADInternals. If we focus on message, that will get us to Get-AADIntTeamsMessages.

Having the documentation for the syntax really helped on this one.

And for the last one, no there isn’t a Get-AADIntPresident command. That would be too easy. How about a command that will show us all the users?

Scrolling up through the output, we find that the President (PattiF), has a flag in the telephone number field.

4 out of 4.

Use the tag #HuntressCTF on BakerStreetForensics.com to see all related posts and solutions for the 2023 Huntress CTF.