sonx4444/CTFs

# CTFs A collection of CTF challenges — including challenges I created for local events and writeups of challenges I've solved. ## ✍️ Authored challenges Challenges I designed and built (source and intended solution included). ### KCSC Recruitment 2023 | Challenge | Category | |---|---| | [dynamic function](2023-KCSC-Recruitment/dynamic%20function) | rev | | [hide and seek](2023-KCSC-Recruitment/hide%20and%20seek) | rev / malware | | [mission impossible](2023-KCSC-Recruitment/mission%20impossible) | rev | | [password checker](2023-KCSC-Recruitment/password%20checker) | rev | | [two-faces](2023-KCSC-Recruitment/two-faces) | rev | ### KMACTF 2025 | Challenge | Category | |---|---| | [chall2 (Heaven's Gate, AES, ASM)](2025-KMACTF/chall2) | rev | | [packer](2025-KMACTF/packer) | rev | ### KMACTF 2026 ## | Challenge | Category | |---|---| | [Nono](2026-KMACTF/Nono) | rev | ## 🚩 Writeups (solved) ### BKCTF 2023 | Challenge | Category | |---|---| | [checker](2023-BKCTF/rev-checker.md) | rev | | [reality](2023-BKCTF/rev-reality.md) | rev | ### CrewCTF 2024 | Challenge | Category | |---|---| | [Ta, Jr. Skid](2024-CrewCTF/Ta%2C%20Jr.%20Skid) | rev | ### KMACTF 2024 | Challenge | Category | |---|---| | [PUSH window, POP nothing](2024-KMACTF/PUSH%20window%2C%20POP%20nothing) | rev | | [Simple Math](2024-KMACTF/Simple%20Math) | rev | ### Flare-On 12 | Challenge | Category | |---|---| | [The Boss Needs Help](FlareOn-12/7_-_The_Boss_Needs_Help) | rev | | [FlareAuthenticator](FlareOn-12/8_-_FlareAuthenticator) | rev | | [10000](FlareOn-12/9_-_10000) | rev | ### Cyber SEA Game 2025 | Challenge | Category | |---|---| | [C1 — Lemonade (XOR + base64 keystream)](2025-Cyber-SEA-Game/China_C1) | crypto | | [C2 — Do You Think I'm Fragile](2025-Cyber-SEA-Game/Angola_C2_DoYouThinkImFragile) | misc | | [C2 — Plato (stego + Vigenère)](2025-Cyber-SEA-Game/Democratic_Republic_of_the_Congo_C2_Plato) | stego | | [C4 — csg_ctf (HTA crackme)](2025-Cyber-SEA-Game/Zambia_C4_csg_ctf) | rev / web | | [C5 — rawbits (EM410x RFID)](2025-Cyber-SEA-Game/South_Sudan_C5_rawbits) | misc | | [C6 — a very old odd file (Baudot/ITA2)](2025-Cyber-SEA-Game/C6_a_very_old_odd_file) | misc | | [N1 — QR shares → SSE-C S3](2025-Cyber-SEA-Game/France_N1) | stego / web | | [N2 — Silent Call, Loud Message](2025-Cyber-SEA-Game/Germany_N2) | forensics | | [N4 — Betrayer (NTLMv2 capture)](2025-Cyber-SEA-Game/Switzerland_N4_betrayer) | forensics | | [M1 — shut down the machine (cloud-init privesc)](2025-Cyber-SEA-Game/Australia_M1) | cloud | | [R1 Q1 — Corrupted (fix PE)](2025-Cyber-SEA-Game/Saudi_Arabia/R1_Q1) | rev | | [R2 — Packer (AES payload)](2025-Cyber-SEA-Game/Greece) | rev | | [R3 — FakeC2 (Go implant)](2025-Cyber-SEA-Game/Sweeden_R3_FakeC2) | rev | | [R6 — Matryoshka (PHP obfuscation)](2025-Cyber-SEA-Game/R6_matryoshka) | web / misc | | [S3 — appended-ZIP carve](2025-Cyber-SEA-Game/Tanza_S3) | forensics | ### HackTheon Sejong 2025 | Challenge | Category | |---|---| | [simple-drm (Tauri DRM bypass)](2025-HackTheon-Sejong/simple-drm) | rev | | [caps-lock (NN backdoor)](2025-HackTheon-Sejong/caps-lock) | misc / ML | | [imagenalysis](2025-HackTheon-Sejong/imagenalysis) | web / rev | ### ACS 2025 (Qualifier & Final) - [ACS 2025 — A Busan victory with KMA LightBlue](https://sonx4444.github.io/posts/acs-2025-a-busan-victory-with-kma-lightblue/) — full writeups published on the blog. ### ACS 2024 (Qualifier & Final) - [ACS 2024 — A silver journey in Ha Long with KMA Orange](https://sonx4444.github.io/posts/acs-2024-a-silver-journey-in-ha-long-with-kma-orange/) — full writeups published on the blog.