> For the complete documentation index, see [llms.txt](https://wiki.zacheller.dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wiki.zacheller.dev/exploit-dev-analysis/static-analysis/hashing.md). # Hashing ## What is Hashing? * A common method used to uniquely identify malware * The malicious software is run through a hashing program that produces a unique hash that identifies that malware (a sort of fingerprint) ### Hashes * MD5 or SHA-1 * Condenses a file of any size down to a fixed-length fingerprint * Uniquely identifies a file well in practice * There are MD5 collisions but they are not common * Collision: two different files with the same hash ### Hash Uses * Label a malware file * Share the hash with other analysts to identify malware * Search the hash online to see if someone else has already identified the file Tool: HashCalc --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://wiki.zacheller.dev/exploit-dev-analysis/static-analysis/hashing.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.