> For the complete documentation index, see [llms.txt](https://pikachuuu1436.gitbook.io/re_fun/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://pikachuuu1436.gitbook.io/re_fun/ctf-challenges/grey-cat-the-flag-2025.md).

# Grey Cat The Flag 2025

After 4 years, I came back as a challenge creator xD. I wrote a DFIR challenge involving an infection chain that resulted from installing an installer from an untrusted source.  Here I will be covering the challenge overview and a potential solution to the challenge!