Description: A simple packed binary? Think again! This executable claims to be UPX-packed, but something isn’t quite right. Standard UPX tools fail to unpack it, perhaps trying to unpack manually ...

Description: You’ve found out a executable that validates serial numbers. Your task is to reverse engineer the validation algorithm and understand how it works. The program checks if a given 10-ch...

Description: A 32-bit executable, seemingly harmless, opens a Google search page upon launch to blend in. However, something isn’t right—it’s quietly orchestrating actions in the background. Exami...

Description: Analyze the assembly, trace the flow, understand the operations Category: Reverse No Flag Format Download File

An investigation authority found an image from a terrorists’ email without any context but with the title “Next attack”. They have to find out which airport, which airline hanger and which aircraft...

Description: Locate and decode a hidden message within a seemingly simple program. The flag isn’t hard-coded – it’s lurking in memory, waiting for you to unveil it Category: Reverse Flag for...

Description: While on a recent trip, I encountered an intriguing train. Unfortunately, video recording wasn’t allowed, so I captured its sound instead. Can you tell me the nickname of this locomot...

Description: I love fish, and my place is full of them. One day, my neighbor knocked and said, “There’s an aquarium with 100 goldfishes in it and it has a nick-name of a movie character.” She gave...

Description: The message is very clear. Find the location of the image. Category: OSINT Flag: CTF{coordinates-three-place-decimals-like-5.239} Hint: Try Shazam (It works, indirectly)

Description: A highway patrol officer in France faced a terrifying ordeal when a speeding truck crashed into his parked emergency vehicle. Luckily, a split-second decision saved his life. Howeve...