Hasher

What Hasher does

Guided SUSA tool journey

Hasher supports analyst workflow support. In this guide, you will use it to calculate and compare hashes for original, working, and derived training files. The procedure and screenshots provide the practical reference; the surrounding context explains what to record and how to judge the result.

Tool guide at a glance

Investigation task

Calculate and compare hashes for original, working, and derived training files.

Starting material

Clearly labelled working copies and a separate controlled output directory.

Successful outcome

A reproducible supporting result with input, transformation, output, and integrity context.

Evidence and safety

Keep original, working, and derived material separate. Treat links, archives, and files as untrusted when appropriate. Record the input identifier, tool version, relevant commands or settings, time and time zone, output location, and any errors or limitations as you work.

Choose your journey

01Understand the evidenceLearn the analyst workflow support concepts and limitations.Complete when you can explain what the evidence can and cannot show.Beginner · No tool required · 15–25 min 02Follow the Hasher guideWork through the commands, screenshots, and instructional sequence below.Complete when the documented workflow produces its expected output.Guided · SUSA workstation · Time varies 03Interactive labPractise the tool workflow in a safe browser simulation.Complete when the guided result is supported by the case evidence.Beginner · Browser only · 10–20 min 04Full LabInvestigate an authorised training scenario with fewer prompts and preserve a reviewable result.Complete when another analyst can reproduce and verify the outcome.Intermediate · Isolated lab · 45–90 min

How the labs complement this guide

The Interactive Lab is a safe browser simulation for practising the workflow and validation logic. The Full Lab is an independent exercise for an isolated, authorised environment. Confirm the installed tool version and expected output before relying on either exercise in a real case.

Accessing Hasher in SUSA

Hasher is a small utility by Eric Zimmerman used to calculate cryptographic hash values for files and text.

Hash the source and working copy before analysis, record the algorithm used and compare the values exactly. A matching hash supports integrity between those two states; it does not establish that a file is benign, authentic or correctly attributed.

The tool is available in C:\Tools\Zimmerman Tools\Hasher.