: x64dbg for stepping through the code to see how it manipulates the input.
Challenge 10 of the 2018 Flare-On competition involved an image file and a deeply obfuscated sequence. Below is the general methodology for tackling such a challenge: IAN18.rar
: PEStudio to find suspicious strings or imports. : x64dbg for stepping through the code to
: Perform a file command or use tools like Binwalk to inspect the .rar structure. Often, these archives are password-protected, requiring you to find a "breadcrumb" in earlier stages of the competition or via string analysis. : Perform a file command or use tools
For a detailed step-by-step walkthrough, you can find full community solutions on platforms like Medium or specialized security blogs.
: In the case of IAN18-related challenges, the name often hints at a specific algorithm or a name (e.g., a "magic string" or "IAN"). The solution usually involves: Identifying a custom encryption or XOR loop.
Extracting a hidden payload from the metadata of an image or within the RAR's comment field.