Taeyang Lee's Blog

About2

Hello. I am Taeyang Lee, a security researcher at Theori. You can find me via handle @5unkn0wn.

I specialize in reverse engineering, finding vulnerabilities from closed sources, and developing exploits. I also have experienced a lot of binary/mobile analysis and white box penetration testing.

And, I play CTF as The Duck, a team from Theori.

Interest & Research

I am currently focusing on my research on Android Bootloader and TEE security. I’ve found several vulnerabilities and developed exploits on the Android bootloader.

I am also interested in binary obfuscation and developing a deobfuscator. I’ve researched modern obfuscators such as Themida, VMProtect, and Android solutions.

Work Experience

  • 2019.01 ~
    Senior Researcher, Security Assessment, @Theori
    • White box penetration testing
    • Binary / mobile analysis
    • Vulnerability research

  • 2018.03 ~ 2018.12
    Researcher, @Stealien
    • Penetration testing
    • Ransomware analysis

Awards

20241stACSC CTF5unkn0wnAsia International
20241stLINE CTFThe DuckJapan
20231stDEF CON 31MMMLas Vegas, US
20231stGoogle CTFMMMN/A
20231stWhitehat ContestThe DuckSeoul, South Korea
20231stLINE CTFThe DuckJapan
20231stSamsung SSTFThe DuckSeoul, South Korea
20232ndBlackhat MEAThe DuckRiyadh, Saudi Arabia
20232ndWACONThe DuckSeoul, South Korea
20232ndCyber Conflict ExerciseThe DuckSeoul, South Korea
20233rdCODEGATE GeneralThe DuckSeoul, South Korea
20221stDEF CON 30MMMLas Vegas, US
20221stCODEGATE GeneralThe DuckSeoul, South Korea
20221stCyber Conflict ExerciseThe DuckSeoul, South Korea
20221stSamsung SSTFThe DuckSouth Korea
20222ndWhitehat ContestKang-Jinoh fcSouth Korea
20222ndWACONThe DuckSeoul, South Korea
20211stWhitehat ContestKang-Jinoh fcSouth Korea
20211stSamsung SSTFThe DuckSouth Korea
20211stLINE CTFThe DuckJapan
20213rdCyber Conflict ExerciseDream RetrieverSouth Korea
20201stSamsung SSTFThe DuckSeoul, South Korea
20201stWhitehat Grand Prix 06KingTigerPrawnVietnam
20201stCyber Conflict ExerciseSpaceX RocketSeoul, South Korea
20201stDigital Forensic ChallengenonameSeoul, South Korea
20191stCyber Conflict ExerciseYook-Hae-GongBusan, South Korea
20191stDigital Forensic ChallengenonameSeoul, South Korea
20182ndWhitehat Grand Prix 04coconutCoffeeHanoi, Vietnam
20182ndDigital Forensic ChallengeForeng2Seoul, South Korea
20182ndCyber Conflict ExerciseLeaveCatJeju, South Korea
20173rdCODEGATE Junior5unkn0wnSeoul, South Korea
20161stWhitehat Contest JuniorLeaveCatSeoul, South Korea
20162ndCODEGATE Junior5unkn0wnSeoul, South Korea

Contact