This is the analysis report on the cases of the TTPs that the attackers do in preparation for launching an attack.
You could find the original Korean version of the report here:
https://www.krcert.or.kr/data/reportView.do?bulletin_writing_sequence=36210
You could find the original Korean version of the report here:
https://www.krcert.or.kr/data/reportView.do?bulletin_writing_sequence=36210