Brunners on Adamino CTF Writeups

Rubik's Cube

Sat, 22 Aug 2026 21:34:01 +0200

Challenge Name: forensics_rubiks-cube

Category: Forensics

Difficulty: Medium

Author: Vincent

Challenge Description

Our coworker just got a new Rubik’s Cube and it is driving everyone in the office crazy. But more importantly, it is decreasing their productivity and thereby shareholder value.

Magic or Not

Sat, 22 Aug 2026 20:13:04 +0200

Challenge Name: misc_magic-or-not

Category: Misc

Difficulty: Easy

Author: H4N5

Challenge Description

As an intern at Brunner Corporation, I developed a cutting-edge image obfuscation algorithm, designed to hide sensitive image data.

I’m confident it’s secure, but the security team isn’t convinced. They believe custom cryptography always hides a flaw.

Roadmap

Sat, 22 Aug 2026 19:57:15 +0200

Challenge Name: rev_roadmap

Category: Reversing

Difficulty: Medium

Author: Quack

Challenge Description

In Brunnerne Inc.™, every request now flows through our new Edge Roadmap Router. Only stakeholders who follow the approved roadmap reach the internal dashboard.

KPwhy

Sat, 22 Aug 2026 19:45:15 +0200

Challenge Name: rev_kpwhy

Category: Reversing

Difficulty: Easy-Medium

Author: rvsmvs

Challenge Description

Here at BrunnerCorp, we value performance almost as much as we value employee satisfaction. That’s why we’ve rolled out KPIman, our new tracker that assigns every employee a productivity score. Suspiciously, exactly one employee ID ever hit a perfect 100%. Find our model employee and keep your job.

Go Go Decompile

Sat, 22 Aug 2026 19:42:57 +0200

Challenge Name: rev_go-go-decompile

Category: Reversing

Difficulty: Easy

Author: Quack

Challenge Description

Uh oh, I’ve been crunching numbers all month in Go Go BudgetMaster, but the cleaning crew accidentally threw out my license key Post-it. Now management’s breathing down my neck about the budget.

Mindbreaker

Sat, 22 Aug 2026 13:05:48 +0200

Challenge Name: pwn_mindbreaker

Category: PWN

Difficulty: Very Hard

Author: Anakin

Challenge Description

INTERNAL MEMO: Automation & Robotics Division

Back when Brunnerne Inc.™ was still a home bakery, someone automated the cake-decorating line with a LEGO MINDSTORMS EV3 brick. Several restructurings later, nobody remembers how the firmware works, but it is load-bearing, so we do not touch it.

Pure Notes

Sat, 22 Aug 2026 12:18:50 +0200

Category: PWN

Difficulty: Medium-Hard

Author: Vincent

Challenge Description

My boss said that our current note taking solution isn’t productive and functional. So I made this purely functional note taking app.

We get the full Haskell source (Main.hs), a Dockerfile, and a flag.txt. The program is a classic heap-note menu — new, write, writehex, view, delete, list — but written in Haskell on top of the C FFI allocator.

Locked Out

Fri, 21 Aug 2026 21:01:49 +0200

Category: PWN

Difficulty: Medium

Author: Togby & Nissen

Challenge Description

After Brunnerne Inc. refused to raise our wages, us bakers on the factory floor went on a huge strike. Management responded with a lockout - and apparently changed all our PIN codes.

Brunner Stocks

Fri, 21 Aug 2026 20:42:19 +0200

Category: PWN

Difficulty: Easy-Medium

Author: Vincent

Points: 100

Challenge Description

Brunnerne Inc. just released their state of the art automated stock trading algorithm. Just answer this simple survey on your investment preferences and we will handcraft a custom stock trading algorithm for you.

Business Trip

Fri, 21 Aug 2026 20:19:19 +0200

Challenge Name: Business Trip

Category: OSINT

Difficulty: Beginner

Author: OddNorseman

Challenge Description

My company sent me on a business trip to close an important deal with a major supplier. But, ehh… Boss makes a dollar, I make a dime, that’s why I ski on company time.