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Introduction:
Digital forensics investigations often grind to a halt when examiners cannot interact with disk images as if they were live systems. Traditional mounting tools expose only file systems as network shares, severely limiting access to artifacts like encrypted credentials, browser data, and application secrets. Arsenal Image Mounter (AIM) revolutionizes this workflow by mounting forensic images as complete, bootable disks—seamlessly integrating with Windows Disk Manager, launching images as virtual machines, and bypassing both Windows authentication and the Data Protection API (DPAPI) to unlock a suspect’s digital activity without ever needing their password.
Learning Objectives:
- Master the core functionality of Arsenal Image Mounter (AIM) and its unique ability to mount disk images as complete disks.
- Understand how to execute a Windows authentication bypass and DPAPI bypass to access protected user data.
- Learn to launch forensic disk images as live virtual machines to analyze system behavior from the user’s perspective.
- Explore remote forensic acquisition using AIM Remote Agent and the Windows Forensic Environment (WinFE).
- Compare AIM’s capabilities with open-source Linux methods for mounting forensic images.
You Should Know:
- Unlocking the Impossible: Forensic Image Mounting as a Complete Disk
Most disk image mounting solutions treat an image as a simple file system share. This approach fails when you need to interact with BitLocker, mount Volume Shadow Copies (VSCs), or launch the operating system. Arsenal Image Mounter (AIM) is different: it presents the contents of a forensic image to Windows as a complete, physical disk device. This allows investigators to use standard Windows tools like Disk Manager, perform BitLocker operations, and access VSCs as if they were handling a real hard drive.
AIM supports a wide range of formats, including raw (dd), E01 (EnCase), and virtual machine disks (VMDK, VHD, VHDX). It includes both a Free Mode for basic mounting and a Professional Mode that unlocks advanced features. A critical Pro feature is temporary write support: you can make changes to a mounted image without altering the original evidence by using replayable differencing files. This is invaluable when you need to run a suspicious executable or test a hypothesis in a sandboxed environment.
Step-by-step guide: Mounting an Image with AIM (Free Mode)
- Download and Install: Obtain the latest AIM installer from the official Arsenal Recon website.
- Launch the GUI: Run the Arsenal Image Mounter application with administrative privileges.
- Select the Image: Click “Mount Image(s)” and browse to your forensic image file (e.g.,
evidence.E01). - Configure Settings: Choose the “Disk Device” mount type to present the image as a complete disk.
- Mount: For a read-only investigation, leave write support disabled. Click “Mount”. The image will appear as a new disk in Windows Disk Management.
Alternative: PowerShell Automation for Bulk Mounting
AIM provides a powerful PowerShell module for scripting repetitive tasks. To mount an image using the command line:
Import-Module ArsenalImageMounter Mount-Image -Path "C:\Cases\evidence.E01" -ReadOnly
For advanced users, you can specify a temporary write differencing file:
Mount-Image -Path "evidence.raw" -WriteTemporary -DifferencingPath ".\temp_changes.dat"
- The Forensic Goldmine: Bypassing Windows Authentication and DPAPI
One of AIM’s most celebrated capabilities is its ability to bypass Windows login screens and the Data Protection API (DPAPI). DPAPI is the mechanism Windows uses to encrypt sensitive data like saved website credentials, Wi-Fi passwords, and application secrets. Typically, this data can only be decrypted after a user logs in. AIM bypasses this entirely.
When you launch a disk image as a virtual machine, AIM intercepts the Windows authentication process. Instead of requiring a password, it injects its own authentication bypass, dropping you directly onto the desktop of the last logged-on user. In Professional Mode, AIM can then seamlessly decrypt the user’s DPAPI-protected data. This allows an investigator to open a browser and view saved passwords for email, banking, or social media sites without ever knowing the user’s password. As Arsenal Recon’s documentation notes, “Bypass Data Protection API (DPAPI), which provides seamless access to the last logged-on user’s DPAPI-protected content such as website, network share, and application credentials”.
Step-by-step guide: Launching a VM with Windows Authentication and DPAPI Bypass (Professional Mode)
- Ensure Hyper-V is Installed: AIM relies on the Windows Hyper-V platform to run virtual machines.
2. Launch AIM: Run AIM as an administrator.
- Select your Image: Click “Mount Image(s)” and add your forensic image.
- Mount as Disk: Mount the image as a “Disk Device”.
- Launch VM: Right-click on the newly mounted disk in the AIM interface and select “Launch Virtual Machine”.
- Configure Bypasses: In the launch options dialog, ensure “Bypass Windows Authentication” and “Bypass Data Protection API (DPAPI)” are both enabled. By default, DPAPI bypass is enabled if it is possible.
- Boot the Image: Start the VM. AIM will boot the image, bypass the login screen, and deposit you directly onto the suspect’s desktop with all their DPAPI secrets unlocked.
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Remote Acquisition and Forensic Triage with AIM Remote Agent and WinFE
Physically removing a hard drive from a modern laptop for traditional imaging is risky. It can trip chassis intrusion detection, break tamper-evident seals, or trigger BitLocker recovery mode, permanently locking the data. AIM Remote Agent solves this by allowing a forensic analyst to access a suspect computer’s disks over a network, without ever opening the case.
The Remote Agent is a command-line utility that runs on a target computer booted into a forensically-sound environment. Arsenal strongly recommends running it from the Windows Forensic Environment (WinFE), a minimal Windows boot environment that keeps all disks read-only and offline by default. Once the agent is running, it makes the system’s physical disks available to a main AIM workstation on the network. The analyst can then interact with the remote disk as if it were local: unlocking BitLocker, mounting VSCs, or even launching the entire remote system as a virtual machine.
Step-by-step guide: Building WinFE with AIM Remote Agent
- Download Dependencies: Obtain the Windows ADK, WinFE build scripts, and the AIM installer.
- Extract AIM Remote Agent: Download the full AIM installer from Arsenal Recon. Extract the contents (using 7-Zip or similar) and locate the `AIMRemoteAgent.exe` file.
- Integrate Agent into WinFE: Follow the WinFE build instructions to add the extracted `AIMRemoteAgent.exe` to your custom WinFE image. Recent versions of WinFE include the agent by default.
- Boot Target with WinFE: Boot the suspect computer using the custom WinFE USB drive.
- Run Remote Agent: Open a command prompt in the WinFE environment and launch the agent:
AIMRemoteAgent.exe --ip 192.168.1.50
Replace the IP address with the address of your forensic workstation.
- Connect from AIM: On your workstation, open AIM, go to the Remote Agent tab, and connect to the agent’s IP address. The remote disk will appear as a standard device in AIM.
4. Open-Source Alternatives: Linux Methods for Image Mounting
While AIM is a powerful Windows-1ative tool, forensic analysts should be familiar with command-line methods on Linux. Using open-source tools like losetup, kpartx, and libguestfs, an investigator can mount and explore disk images without a specialized GUI.
Step-by-step guide: Mounting a Raw Disk Image on Linux using `losetup` and `kpartx`
1. Associate the Image with a Loop Device:
sudo losetup /dev/loop0 evidence.raw
2. Map Partitions: If the image contains multiple partitions (most do), use `kpartx` to create device map entries for each.
sudo kpartx -a /dev/loop0
This command creates devices like `/dev/mapper/loop0p1` for the first partition.
3. Mount the Desired Partition: Mount the partition, for example the first partition, as read-only.
sudo mount -o ro /dev/mapper/loop0p1 /mnt/analysis
4. Unmount and Cleanup: When finished, unmount the filesystem and remove the loop device mappings.
sudo umount /mnt/analysis sudo kpartx -d /dev/loop0 sudo losetup -d /dev/loop0
For more advanced analysis, `libguestfs` and its interactive shell `guestfish` allow you to browse and modify disk images without needing to mount them as block devices. This is often more stable and secure for complex images. A simple command to open an image and browse its files is:
guestfish -i -a evidence.raw
The `-i` option automatically mounts the root partition from the disk image.
5. Professional Development: Arsenal Image Mounter Online Training
To fully leverage AIM’s potential, structured training is essential. Arsenal Recon offers an official online training course hosted by SUMURI. Designed to improve and demonstrate AIM mastery, the six-hour course is created by the developers of the tool and includes downloadable step-by-step instructions. It covers the vast amount of functionality AIM provides, from bypassing Windows authentication and DPAPI to managing BitLocker volumes and mounting Volume Shadow Copies. Upon completion, students can take a practical examination to receive a certification. The course costs $158 and once purchased, it never expires, making it a sound investment for any digital forensics professional.
- Advanced Triage: Leveraging AIM’s Volume Shadow Copy (VSC) Functionality
Volume Shadow Copies represent one of the most valuable evidence sources on a Windows system, holding snapshots of files and registry hives from previous points in time. AIM provides multiple methods for working with VSCs, far surpassing the capabilities of standard file explorers. Analysts can mount VSCs as complete, bootable disks or launch them directly into a virtual machine. As documented in AIM’s feature list, this includes “multiple methods of Volume Shadow Copy mounting (standard, with Windows NTFS driver bypass, or as complete disks)” and the ability to “launch virtual machines directly from Volume Shadow Copies”.
7. Windows File System Driver Bypass (WFSDBM) Mode
One of the more technical but extremely useful features in AIM Professional is the Windows File System Driver Bypass mode. This feature allows AIM to expose low-level file system metadata, including NTFS attributes, slack space, and unallocated space directly in Windows File Explorer. This gives an investigator a view of deleted or hidden data that would otherwise require a specialized carving tool like Autopsy or The Sleuth Kit. This mode is particularly powerful when combined with remote access via AIM Remote Agent, allowing an analyst to perform a deep, low-level inspection of a remote system’s file system without ever creating a full disk image.
What Undercode Say:
- The power of mounting a forensic image as a complete disk cannot be overstated. It transforms static evidence into a dynamic, interactive system, unlocking artifacts that traditional file-system mounts leave hidden.
- The ability to launch a suspect’s system as a live VM and bypass both login and DPAPI is a game-changer. This technique effectively allows you to “become” the user, gaining instant access to their browser passwords, cloud storage, and encrypted files.
Expected Output:
After integrating AIM into your digital forensics workflow, you can expect to reduce the time spent extracting encrypted credentials from hours to minutes. The ability to work with remote systems without physical tampering preserves critical metadata and avoids triggering anti-forensic mechanisms. Furthermore, the option to temporarily write to an image allows for safe dynamic analysis—you can execute malicious code or change configuration files within a controlled environment, knowing the original evidence remains pristine.
Prediction:
- +1 AIM’s approach to mounting disk images as complete disks will set a new standard for digital forensics tools, pushing competitors to adopt similar kernel-level integration to remain relevant. The forensic market will shift away from partition-based mounting towards full-disk virtualization.
- -1 As tools like AIM popularize DPAPI bypass techniques, Microsoft may be forced to further harden Windows authentication and data protection mechanisms. This could lead to an arms race between forensic investigators and operating system security, potentially making future versions of Windows more resistant to lawful forensic access.
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