Top 10 Forensic Imaging Tools for PLCs and HMI Devices
Why PLC and HMI imaging is different
A PLC or HMI is not just another endpoint. Depending on the platform, investigators may face removable SD cards, embedded flash, SSDs, eMMC storage, proprietary project files, or an industrial PC running Windows or Linux behind the panel. That is why a good toolkit has to cover both standalone acquisition and downstream analysis. NIST’s OT DFIR guidance recommends combining IT-style forensic tools with OT-specific tools and even physical industrial components in the lab so investigators can reproduce the real environment as closely as possible.
For readers building an OT-ready toolkit, the practical goal is simple: preserve the original media, capture a verifiable image, document every action, and choose tools that work across a wide range of storage types and acquisition scenarios. OpenText’s forensic hardware line emphasizes imaging, duplication, and write-blocking for preserving evidence integrity, which is exactly the mindset OT teams need when they are working around live production assets.
Top 10 forensic imaging tools for PLCs and HMI devices
1) OpenText Forensic TX2 Imager / Tableau ecosystem
If your priority is a fast, defensible hardware acquisition workflow, OpenText’s forensic imaging ecosystem belongs near the top of the list. The company’s hardware lineup is built around forensic imaging, duplication, and write-blocking, and its standalone imagers are designed for consistent acquisition results with evidence integrity in mind. OpenText also positions the Tableau bridges and duplicators as support for multiple storage interfaces, which is useful in OT environments where industrial PCs and HMI panels may expose different disk types over time.
This is the kind of toolset that shines when you need to image a panel PC, an engineering workstation drive, or a removable module without introducing risk. In OT work, speed matters, but repeatability matters more.
2) OpenText forensic bridges and write blockers
A forensic imager is only half the story. OpenText’s forensic bridges are dedicated write blockers that provide read-only access during evidence acquisition and are designed to keep suspect storage media unchanged. The company says these bridges are built to keep pace with modern I/O and storage technologies, which matters when you are dealing with the variety of media found in industrial settings.
For PLC and HMI cases, this is foundational equipment. Even if the actual image is created with another tool, a write blocker helps you preserve evidential integrity while copying SSDs, USB media, or other suspect storage attached to engineering or operator systems.
3) Exterro FTK Imager
FTK Imager remains one of the most practical general-purpose acquisition tools for field responders and lab teams. Exterro’s current product pages describe it as a free tool for previewing and imaging hard drives, removable media, and logical volumes, with hash generation and evidence-preservation workflows built in.
That makes FTK Imager a strong fit for OT teams who need a dependable “first response” option for HMI drives, laptop-based engineering stations, USB evidence, or removable media taken from cabinet-mounted systems. It is not specialized for PLC memory extraction, but for storage acquisition it is reliable, familiar, and easy to deploy.
4) X-Ways Imager and X-Ways Forensics
X-Ways is one of the most respected names in disk imaging and low-level analysis. The vendor describes X-Ways Forensics as an integrated computer forensics environment and X-Ways Imager as a disk imaging and cloning tool with virtual RAID reconstruction support. The platform also includes WinHex, a hex editor and disk editor useful for low-level inspection.
For PLC and HMI investigations, X-Ways is valuable when the case requires both precise acquisition and a deep look at raw data structures. That combination is especially useful for proprietary images, corrupted filesystems, and oddball storage layouts that often show up in industrial equipment.
5) Guymager
Guymager is an excellent open-source choice for Linux-based acquisition. The official project page describes it as a free forensic imager for media acquisition that can produce DD, EWF, and AFF images and supports disk cloning. The project also emphasizes speed and a straightforward user interface.
In OT environments, Guymager is a strong fit for responders who prefer a Linux workstation or a dedicated forensic boot environment. It is particularly handy when imaging removable media pulled from HMIs, industrial PCs, or embedded storage adapters because it keeps the workflow simple while still producing standard forensic output.
6) Autopsy
Autopsy is not just an analysis platform; it is a very practical companion to any imaging workflow. Sleuth Kit Labs describes it as a free, end-to-end open-source digital forensics platform, and its current download guidance supports Windows, Linux, and macOS installation paths.
For OT investigations, Autopsy is especially useful after acquisition. Once you have the image from an HMI, engineering workstation, or removable device, Autopsy helps organize the evidence, review timelines, and extract useful artifacts. It is a strong option for teams that want a cost-effective analysis layer after they finish imaging.
7) dcfldd
If your team likes command-line control, dcfldd is a classic choice. The project is a patched version of dd forensics work and adds features such as hashing and improved logging. The Debian package description and the maintained GitHub repository both describe it as an enhanced version of dd for forensics and security.
dcfldd is especially useful in OT labs where scripting, repeatability, and auditability matter. It is not flashy, but it is dependable when you need a low-level acquisition routine that fits into a documented chain-of-custody process.
8) dc3dd
dc3dd is another dd-based acquisition tool that adds forensic features. Kali’s official tool listing describes it as a patched version of GNU dd with on-the-fly hashing, error logging, split output, pattern wiping, and progress reporting. SourceForge also describes it as a forensic-oriented patch to dd built for data acquisition.
For PLC and HMI evidence, dc3dd is a solid fit when you need a no-nonsense image from removable media or a disk exposed through a write blocker. Its value lies in transparency: every step is visible, scriptable, and easy to document.
9) Belkasoft Remote Acquisition / Belkasoft X
Belkasoft’s remote acquisition tooling is useful when the HMI or industrial workstation cannot be physically removed right away. The company says its remote acquisition feature can collect images from hard drives, removable drives, and RAM on remote machines, while Belkasoft X can acquire and analyze disk images and other evidence sources.
That matters in OT because downtime is expensive and access windows are narrow. When an HMI is Windows-based or an engineering station is distributed across facilities, remote acquisition can help preserve evidence before the device is reimaged, repaired, or returned to service.
10) Magnet Acquire
Magnet Acquire is a practical acquisition tool when the evidence set includes tablets, phones, or mobile-style operator devices alongside traditional storage media. Magnet says the tool can quickly acquire forensic images from iOS and Android devices, as well as hard drives and removable media.
That makes it useful in modern industrial environments where operators use rugged tablets, companion devices, or mobile apps to interact with the plant. It is not a PLC-specific dumper, but in a converged OT setting it can help preserve important supporting evidence around the control system.
What a good OT imaging workflow looks like
The best tool is not the one with the most features. It is the one that fits the evidence and preserves the system. A strong OT acquisition workflow usually starts with a write blocker, continues with a verified forensic image, and ends with hashes, notes, and secure storage of the original media. OpenText, Exterro, and Magnet all emphasize integrity-preserving acquisition, while NIST recommends risk-based tailoring rather than using any security or DFIR guide as a rigid checklist.
For PLCs and HMIs, this usually means three things. First, capture storage from the HMI or engineering workstation before touching anything else. Second, preserve any removable media, SD cards, USB devices, or vendor-provided modules. Third, keep a clean lab environment ready so images can be reviewed without reconnecting the original device to the production network. NIST specifically recommends OT labs include physical industrial components where possible, because analyzing evidence close to the real operating environment improves accuracy.
Final take
There is no single “best” forensic imaging tool for every PLC or HMI device. The right answer depends on the media, the vendor ecosystem, the urgency of the incident, and how much access you have to the asset. In practice, most mature OT teams keep a mix of hardware write blockers, a standalone imager, a Linux-based open-source option, and a forensic analysis platform for post-acquisition review. That blend matches what NIST describes for OT DFIR: a combination of IT tools, OT-aware tools, and lab capabilities that can handle PLCs, industrial equipment, software, firmware, and diagnostics.