Description: The mysterious cryptographer Luhn created a safe vault that verifies numerical inputs using a technique he knows. For years, the vault has guaranteed its secrets, now is your time to ...

Description: Your team has been alerted to suspicious activity on the corporate network. An attacker exploited CVE-2023-23397, a critical Microsoft Outlook vulnerability, to silently steal NTLM cr...

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...