NSHC’s March 2023 ThreatRecon report identifies SectorA as the most active cluster set and documents five SectorA subgroups operating during the month. SectorA01 used cryptocurrency-exchange VIP-fee promotion lures to deliver malicious Excel macros that downloaded follow-on malware for system control, while SectorA02 distributed RAR-packed CHM malware themed as card statements, notices, requests, and admissions documents. SectorA05 used a divorce-confirmation Word lure, SectorA06 sent police-themed spear-phishing emails to North Korea-related personnel and maintained persistence for keylogging and clipboard collection, and SectorA07 used tax-audit-themed ZIP/LNK malware to collect process, file, installation, and network information. The report frames SectorA activity as a mix of South Korea-focused political/diplomatic intelligence collection and global financially motivated operations.