> For the complete documentation index, see [llms.txt](https://kos0ng.gitbook.io/ctfs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://kos0ng.gitbook.io/ctfs/write-up/2023/flare-on-10/challenge-1-x.md). # Challenge #1 - X ### Description Welcome to the 10th Annual Flare-On Challenge! Statistically, you probably won’t finish every challenge. Every journey toward excellence starts somewhere though, and yours starts here. Maybe it ends here too. This package contains many files and, I can’t believe i’m saying this, click the one with the “.exe” file extension to launch the program. Maybe focus your “reverse engineering” efforts on that one too. ### Solution Since the pin only 2 digits, i bruteforce it manually.

Another solution is by decompiling the program using dnspy. At the time of competition i used old version of [dnspy](https://github.com/dnSpy/dnSpy) which didn't produce the actual code. But after competition i notice that there is a new version of [dnspy](https://github.com/dnSpyEx/dnSpy) that maintained by another user. Download the latest version from the repository and then decompile the X.dll.

By executing the program we know that the flag will be shown if we input valid 2 digits and click the "lock" button. Based on the function structure name, the function lockButton\_Click will be the called function when we click the "lock" button. So by looking at decompiler result we can get the flag directly in plaintext. Flag : --- # 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://kos0ng.gitbook.io/ctfs/write-up/2023/flare-on-10/challenge-1-x.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.