UIUCTF 2025 | OSINT | Writeups

Mr. Blue Sky — OSINT

We start with a link to Mr. Blue Sky’s profile. At first glance, nothing interesting shows up — just a normal post.

However, checking his 44 followers, I spot an account: hemphy.bsky.social

Digging deeper, I view Hemphy’s following list (11 accounts). Among them, one stands out:

Mark the Bird Watcher_._

His profile bio contains the flag: uiuctf{REDACTED}

Park — Osint

We’re given an image: park.jpg. The goal is to identify the name of the park.

Using Google Lens to reverse image search the photo, it reveals the location and name of the park.

The flag: uuictf{Park_Name}

You can check out more of my work here:

• 🔗 GitHub: github.com/Bl0ss0mX5
• 🔗 Medium: medium.com/@bl0ss0mx5