https://x3ric.com/blog/tags/rev/CTF notes, systems work, and writeups.Hugoen-usSat, 06 Jun 2026 21:41:13 +0200https://x3ric.com/blog/posts/HackTheBox-Hexecution-Challenge/https://x3ric.com/blog/posts/HackTheBox-Hexecution-Challenge/Sat, 06 Jun 2026 00:00:00 +0200challengehtbrevangrEnter the challenge flag to unlock this writeup.https://x3ric.com/blog/posts/HackTheBox-LicenseGenerator/https://x3ric.com/blog/posts/HackTheBox-LicenseGenerator/Fri, 27 Jun 2025 01:20:00 +0800challengehtbrevxorlinuxLicenseGenerator: recover the XOR transform from the binary and invert it to reveal the flag.https://x3ric.com/blog/posts/HackTheBox-SatelliteHijack/https://x3ric.com/blog/posts/HackTheBox-SatelliteHijack/Fri, 27 Jun 2025 01:20:00 +0800challengehtbrevgdbxorlinuxSatelliteHijack: trace the binary, isolate the validation routine, and invert it to recover the flag.https://x3ric.com/blog/posts/HackTheBox-BinCrypt-Breaker-Challenge/https://x3ric.com/blog/posts/HackTheBox-BinCrypt-Breaker-Challenge/Sun, 16 Feb 2025 00:20:00 +0800challengehtbrevxorlinuxEnter the challenge flag to unlock this writeup.https://x3ric.com/blog/posts/HackTheBox-Curse-Breaker-Challenge/https://x3ric.com/blog/posts/HackTheBox-Curse-Breaker-Challenge/Sun, 16 Feb 2025 00:20:00 +0800challengehtbrevlinuxCurse Breaker: reverse the validation logic, model the transform, and recover the accepted input.https://x3ric.com/blog/posts/HackTheBox-Maze-Challenge/https://x3ric.com/blog/posts/HackTheBox-Maze-Challenge/Tue, 04 Feb 2025 17:20:00 +0800challengehtbrevdotnetlinuxEnter the challenge flag to unlock this writeup.https://x3ric.com/blog/posts/HackTheBox-Partial-Encryption-Challenge/https://x3ric.com/blog/posts/HackTheBox-Partial-Encryption-Challenge/Tue, 04 Feb 2025 17:20:00 +0800challengehtbrevlinuxEnter the challenge flag to unlock this writeup.https://x3ric.com/blog/posts/HackTheBox-Behind-the-Scenes-Challenge/https://x3ric.com/blog/posts/HackTheBox-Behind-the-Scenes-Challenge/Thu, 30 Jan 2025 00:20:00 +0800challengehtbrevgdblinuxEnter the challenge flag to unlock this writeup.https://x3ric.com/blog/posts/HackTheBox-Cyberpsychosis-Challenge/https://x3ric.com/blog/posts/HackTheBox-Cyberpsychosis-Challenge/Thu, 30 Jan 2025 00:20:00 +0800challengehtbrevlinuxEnter the challenge flag to unlock this writeup.https://x3ric.com/blog/posts/HackTheBox-ReRop-Challenge/https://x3ric.com/blog/posts/HackTheBox-ReRop-Challenge/Thu, 30 Jan 2025 00:20:00 +0800challengehtbrevxorlinuxEnter the challenge flag to unlock this writeup.https://x3ric.com/blog/posts/HackTheBox-Coffee-Invocation-Challenge/https://x3ric.com/blog/posts/HackTheBox-Coffee-Invocation-Challenge/Wed, 29 Jan 2025 00:20:00 +0800challengehtbrevlinuxEnter the challenge flag to unlock this writeup.https://x3ric.com/blog/posts/HackTheBox-Anti-Flag-Challenge/https://x3ric.com/blog/posts/HackTheBox-Anti-Flag-Challenge/Thu, 23 Jan 2025 09:20:00 +0800challengehtbrevlinuxAnti Flag: reverse the validation logic, model the transform, and recover the accepted input.https://x3ric.com/blog/posts/HackTheBox-Baby-Crypt-Challenge/https://x3ric.com/blog/posts/HackTheBox-Baby-Crypt-Challenge/Thu, 23 Jan 2025 09:20:00 +0800challengehtbrevxorlinuxBaby Crypt: recover the XOR transform from the binary and invert it to reveal the flag.https://x3ric.com/blog/posts/HackTheBox-Baby-RE-Challenge/https://x3ric.com/blog/posts/HackTheBox-Baby-RE-Challenge/Thu, 23 Jan 2025 09:20:00 +0800challengehtbrevelflinuxBaby RE: trace the binary, isolate the validation routine, and invert it to recover the flag.https://x3ric.com/blog/posts/HackTheBox-Eat-the-Cake-Challenge/https://x3ric.com/blog/posts/HackTheBox-Eat-the-Cake-Challenge/Thu, 23 Jan 2025 09:20:00 +0800challengehtbrevlinuxEat the Cake: reverse the validation logic, model the transform, and recover the accepted input.https://x3ric.com/blog/posts/HackTheBox-Encryption-Bot-Challenge/https://x3ric.com/blog/posts/HackTheBox-Encryption-Bot-Challenge/Thu, 23 Jan 2025 09:20:00 +0800challengehtbrevlinuxEncryption Bot: reverse the validation logic, model the transform, and recover the accepted input.https://x3ric.com/blog/posts/HackTheBox-Impossible-Password-Challenge/https://x3ric.com/blog/posts/HackTheBox-Impossible-Password-Challenge/Thu, 23 Jan 2025 09:20:00 +0800challengehtbrevxorlinuxImpossible Password: recover the XOR transform from the binary and invert it to reveal the flag.https://x3ric.com/blog/posts/HackTheBox-IRCWare-Challenge/https://x3ric.com/blog/posts/HackTheBox-IRCWare-Challenge/Thu, 23 Jan 2025 09:20:00 +0800challengehtbrevlinuxIRCWare: reverse the validation logic, model the transform, and recover the accepted input.https://x3ric.com/blog/posts/HackTheBox-Metagaming-Challenge/https://x3ric.com/blog/posts/HackTheBox-Metagaming-Challenge/Thu, 23 Jan 2025 09:20:00 +0800challengehtbrevlinuxMetagaming: reverse the validation logic, model the transform, and recover the accepted input.https://x3ric.com/blog/posts/HackTheBox-Ouija-Challenge/https://x3ric.com/blog/posts/HackTheBox-Ouija-Challenge/Thu, 23 Jan 2025 09:20:00 +0800challengehtbrevlinuxOuija: reverse the validation logic, model the transform, and recover the accepted input.https://x3ric.com/blog/posts/HackTheBox-Ransom-Challenge/https://x3ric.com/blog/posts/HackTheBox-Ransom-Challenge/Thu, 23 Jan 2025 09:20:00 +0800challengehtbrevlinuxRansom: reverse the validation logic, model the transform, and recover the accepted input.https://x3ric.com/blog/posts/HackTheBox-Secured-Transfer-Challenge/https://x3ric.com/blog/posts/HackTheBox-Secured-Transfer-Challenge/Thu, 23 Jan 2025 09:20:00 +0800challengehtbrevlinuxSecured Transfer: reverse the validation logic, model the transform, and recover the accepted input.https://x3ric.com/blog/posts/HackTheBox-Sekure-Decrypt-Challenge/https://x3ric.com/blog/posts/HackTheBox-Sekure-Decrypt-Challenge/Thu, 23 Jan 2025 09:20:00 +0800challengehtbrevlinuxSekure Decrypt: reverse the validation logic, model the transform, and recover the accepted input.https://x3ric.com/blog/posts/HackTheBox-Shuffleme-Challenge/https://x3ric.com/blog/posts/HackTheBox-Shuffleme-Challenge/Thu, 23 Jan 2025 09:20:00 +0800challengehtbrevelflinuxShuffleme: trace the binary, isolate the validation routine, and invert it to recover the flag.https://x3ric.com/blog/posts/HackTheBox-Snakecode-Challenge/https://x3ric.com/blog/posts/HackTheBox-Snakecode-Challenge/Thu, 23 Jan 2025 09:20:00 +0800challengehtbrevlinuxSnakecode: reverse the validation logic, model the transform, and recover the accepted input.https://x3ric.com/blog/posts/HackTheBox-Tear-Or-Dear-Challenge/https://x3ric.com/blog/posts/HackTheBox-Tear-Or-Dear-Challenge/Thu, 23 Jan 2025 09:20:00 +0800challengehtbrevdotnetlinuxTear Or Dear: decompile the .NET logic, rebuild the check, and recover the accepted input.https://x3ric.com/blog/posts/HackTheBox-The-Art-of-Reversing-Challenge/https://x3ric.com/blog/posts/HackTheBox-The-Art-of-Reversing-Challenge/Thu, 23 Jan 2025 09:20:00 +0800challengehtbrevdotnetlinuxThe Art of Reversing: decompile the .NET logic, rebuild the check, and recover the accepted input.https://x3ric.com/blog/posts/HackTheBox-You-Cant-C-Me-Challenge/https://x3ric.com/blog/posts/HackTheBox-You-Cant-C-Me-Challenge/Thu, 23 Jan 2025 09:20:00 +0800challengehtbrevlinuxYou Cant C Me: reverse the validation logic, model the transform, and recover the accepted input.https://x3ric.com/blog/posts/HackTheBox-Rauth-Challenge/https://x3ric.com/blog/posts/HackTheBox-Rauth-Challenge/Thu, 09 Jan 2025 12:20:00 +0800challengehtbrevlinuxEnter the challenge flag to unlock this writeup.https://x3ric.com/blog/posts/HackTheBox-Regas-Town-Challenge/https://x3ric.com/blog/posts/HackTheBox-Regas-Town-Challenge/Mon, 06 Jan 2025 09:20:00 +0800challengehtbrevlinuxEnter the challenge flag to unlock this writeup.https://x3ric.com/blog/posts/HackTheBox-Exatlon-Challenge/https://x3ric.com/blog/posts/HackTheBox-Exatlon-Challenge/Sat, 28 Dec 2024 09:20:00 +0800challengehtbrevlinuxEnter the challenge flag to unlock this writeup.https://x3ric.com/blog/posts/HackTheBox-Spooky-License-Challenge/https://x3ric.com/blog/posts/HackTheBox-Spooky-License-Challenge/Sat, 21 Dec 2024 09:20:00 +0800challengehtbrevlinuxSpooky License: reverse the validation logic, model the transform, and recover the accepted input.https://x3ric.com/blog/posts/HackTheBox-ChromeMiner-Challenge/https://x3ric.com/blog/posts/HackTheBox-ChromeMiner-Challenge/Wed, 18 Dec 2024 09:20:00 +0800challengehtbrevlinuxChromeMiner: reverse the validation logic, model the transform, and recover the accepted input.https://x3ric.com/blog/posts/HackTheBox-FlagCasino-Challenge/https://x3ric.com/blog/posts/HackTheBox-FlagCasino-Challenge/Thu, 12 Dec 2024 09:20:00 +0800challengehtbrevelflinuxFlagCasino: trace the binary, isolate the validation routine, and invert it to recover the flag.https://x3ric.com/blog/posts/HackTheBox-Hunting-License-Challenge/https://x3ric.com/blog/posts/HackTheBox-Hunting-License-Challenge/Thu, 12 Dec 2024 09:20:00 +0800challengehtbrevelfxorlinuxHunting License: trace the binary, isolate the validation routine, and invert it to recover the flag.https://x3ric.com/blog/posts/HackTheBox-LinkHands-Challenge/https://x3ric.com/blog/posts/HackTheBox-LinkHands-Challenge/Thu, 12 Dec 2024 09:20:00 +0800challengehtbrevlinuxLinkHands: reverse the validation logic, model the transform, and recover the accepted input.https://x3ric.com/blog/posts/HackTheBox-Terrorfryer-Challenge/https://x3ric.com/blog/posts/HackTheBox-Terrorfryer-Challenge/Thu, 12 Dec 2024 09:20:00 +0800challengehtbrevlinuxTerrorfryer: reverse the validation logic, model the transform, and recover the accepted input.https://x3ric.com/blog/posts/HackTheBox-Crushing-Challenge/https://x3ric.com/blog/posts/HackTheBox-Crushing-Challenge/Wed, 11 Dec 2024 09:20:00 +0800challengehtbrevlinuxCrushing: reverse the validation logic, model the transform, and recover the accepted input.https://x3ric.com/blog/posts/HackTheBox-Golfer-Challenge/https://x3ric.com/blog/posts/HackTheBox-Golfer-Challenge/Wed, 11 Dec 2024 09:20:00 +0800challengehtbrevelflinuxGolfer: trace the binary, isolate the validation routine, and invert it to recover the flag.https://x3ric.com/blog/posts/HackTheBox-Graverobber-Challenge/https://x3ric.com/blog/posts/HackTheBox-Graverobber-Challenge/Wed, 11 Dec 2024 09:20:00 +0800challengehtbrevgdblinuxGraverobber: trace the binary, isolate the validation routine, and invert it to recover the flag.https://x3ric.com/blog/posts/HackTheBox-Potion-Master-Challenge/https://x3ric.com/blog/posts/HackTheBox-Potion-Master-Challenge/Wed, 11 Dec 2024 09:20:00 +0800challengehtbrevxorlinuxPotion Master: recover the XOR transform from the binary and invert it to reveal the flag.https://x3ric.com/blog/posts/HackTheBox-QuickScan-Challenge/https://x3ric.com/blog/posts/HackTheBox-QuickScan-Challenge/Wed, 11 Dec 2024 09:20:00 +0800challengehtbrevelflinuxQuickScan: trace the binary, isolate the validation routine, and invert it to recover the flag.https://x3ric.com/blog/posts/HackTheBox-Dontt-Panic-Challenge/https://x3ric.com/blog/posts/HackTheBox-Dontt-Panic-Challenge/Sat, 23 Nov 2024 09:20:00 +0800challengehtbrevghidralinuxDont't Panic: trace the binary, isolate the validation routine, and invert it to recover the flag.https://x3ric.com/blog/posts/HackTheBox-Wayback-Challenge/https://x3ric.com/blog/posts/HackTheBox-Wayback-Challenge/Mon, 18 Nov 2024 09:20:00 +0800challengehtbrevlinuxEnter the challenge flag to unlock this writeup.https://x3ric.com/blog/posts/HackTheBox-Shattered-Tablet-Challenge/https://x3ric.com/blog/posts/HackTheBox-Shattered-Tablet-Challenge/Wed, 30 Oct 2024 09:20:00 +0800challengehtbrevghidralinuxShattered Tablet: trace the binary, isolate the validation routine, and invert it to recover the flag.https://x3ric.com/blog/posts/HackTheBox-Bypass-Challenge/https://x3ric.com/blog/posts/HackTheBox-Bypass-Challenge/Tue, 22 Oct 2024 01:20:00 +0800challengehtbrevdotnetEnter the challenge flag to unlock this writeup.https://x3ric.com/blog/posts/HackTheBox-Simple-Encryptor-Challenge/https://x3ric.com/blog/posts/HackTheBox-Simple-Encryptor-Challenge/Sun, 20 Oct 2024 01:20:00 +0800challengehtbrevelfxorlinuxEnter the challenge flag to unlock this writeup.