Nick Name | |
» extr |
Interested In | |
» Cyber Threat Intelligence » Web Service Development » Tea & Whisky |
CTF & Research Groups | |||||||||||||
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Security Service Developer, NCSOFT Gyeonggi, South Korea |
May 2021 - Present - |
» Developing In-house web service » Developed of automation of operation tasks of security infrastructure and heterogeneous security systems |
DFIR Specialist, Plainbit Co., Ltd. Gyeonggi, South Korea |
Aug 2019 - May 2021 1 year 10 months |
» Supported DFIR(Digital forensics and incident response) service. » Analyzed APT accidents and study countermeasures. |
Senior Researcher, Culture Makers Seoul, South Korea |
Nov 2018 - Jul 2019 8 months |
» Military Service (Skilled industrial Personnel)
» Operated infosec-related competitions and produced educational contents(also infosec). » Managed v-networks using virtualization products(vSphere) and developed management tools related it. |
Security Researcher, SEWorks Inc. Seoul, South Korea / CA, United States |
Feb 2017 - Nov 2018 1 year 10 months |
» Military Service (Skilled industrial Personnel)
» Developed automation tools for products operation and management of backend servers. » Developed modules to analyze malicious APKs. |
Software Vulnerability Analyst, WINS Co., LTD. Gyeonggi, South Korea |
Jan 2016 - Jan 2017 1 year |
» Vulnerability research and 1-day vulnerabilities analysis on Microsoft products.
» Developed malicious behavior analysis module included in APT attack detection appliance. » Reviewed appliance bug bounty reports. |
Security Researcher, Divine Security Iksan, Jeollabuk-do |
Jan 2015 - Jun 2015 6 months |
» Developed modules to analyze malicious APKs. |
Security Consultant, ***** Seoul, South Korea |
Mar 2013 - Aug 2013 6 months |
» Black-box and white-box penetration testing for software and web services.
» G-ISMS and ISMS security consult support for security companies. |
Only showing the results of top 3 places and finalists of memorable CTFs, |
International | ||
2020 | 1st place, InterKosen CTF | Japan |
2020 | 1st place, Defenit CTF | South Korea |
2019 | 1st place, Harekaze CTF | Japan |
2019 | 3rd place, DFRWS IoT Forensic Challenge, write-up | United States |
2018 | 2nd place, Digital Forensic Challenge 2018 | South Korea |
2017 | 2nd place, ASIS CTF Finals | Iran |
2017 | 3rd place, Volga CTF | Russia |
2016 | Finalist, TrendMicro CTF | Japan |
2016 | 2nd place, EKOPARTY CTF 2016 | Argentina |
2016 | 1st place, ASIS CTF Finals | Iran |
2016 | 1st place, Volga CTF | Russia |
2014 | Finalist, DEFCON 22 CTF | United States |
Domestic | ||
2022 | Finalist, Cyber Conflict Exercise | Daegu, South Korea |
2019 | Finalist, Cyber Conflict Exercise | Busan, South Korea |
2015 | 1st place, 14th HUST Hacking Festival | Seoul, South Korea |
2015 | 1st place, Find the Digital Culprit | Seoul, South Korea |
2015 | 1st place, Inc0gnito Hacking Competition | Seoul, South Korea |
2014 | 3rd place, Find the Digital Culprit | Seoul, South Korea |
2013 | 3rd place, Whitehat Contest | Seoul, South Korea |
2013 | 3rd place, Find the Digital Culprit | Seoul, South Korea |
2011 | Bronze Prize, Soonchunhyang University 'Y.I.S.F.' | Asan, South Korea |
2011 | Bronze Prize, Tongmyong University 'Information Science Olympiad' | Busan, South Korea |
Software Vulnerability Reports | |||||||||||||||||||||
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CTF Organizer and Challenge Author | |||||||||||||||||||
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Presentation | |||||
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