A Third Vultr Seoul Box: 60+ Kimsuky Domains, 18 Months of DDNS Rotation, and a 5-Year Infrastructure Trail
2026-04-21 • Break Glass Intelligence •
https://intel.breakglass.tech/post/kimsuky-third-vultr-seoul-60-domains-ddns-rotation-naver-nts
Breakglass Intelligence attributes 158.247.210.58, a Vultr Seoul VPS, to the same Kimsuky-aligned infrastructure cluster as two previously documented Vultr Seoul systems. Passive DNS showed more than 60 domains over an 18-month window, with 31 still resolving at publication and naming patterns impersonating Naver, the Korean National Tax Service/HomeTax, and Korean government services. The actor rotated across DDNS providers including mydns, dynv6, dns.army, dns.navy, and kro.kr, suggesting disposable infrastructure management and adaptation to blocklisting. Historical passive DNS tied the VPS to johnnytogdstudio[.]xyz as far back as 2020, indicating unusually long-lived cloud infrastructure control. The report is useful for hunting Korean credential-phishing infrastructure through DDNS patterns, Vultr Seoul hosting, and Naver/NTS-themed domain conventions.
Indicators of Compromise
| Type | Value | First Seen | Last Seen |
|---|---|---|---|
| DOMAIN | nts-nid.dynv6.net | 2026-04-21 | 2026-04-21 |
| DOMAIN | n-cloud.nid-tax.kro.kr | 2026-04-21 | 2026-04-21 |
| DOMAIN | tax-login.n-corp.kro.kr | 2026-04-21 | 2026-04-21 |
| DOMAIN | nts-user.mydns.jp | 2026-04-21 | 2026-04-21 |
| DOMAIN | htax-auth.mydns.jp | 2026-04-21 | 2026-04-21 |
| DOMAIN | nts-nid.n-login.kro.kr | 2026-04-21 | 2026-04-21 |
| DOMAIN | govkr-tax.nid-auth.kro.kr | 2026-04-21 | 2026-04-21 |
| DOMAIN | n-store.nskrm.dynv6.net | 2026-04-21 | 2026-04-21 |
| DOMAIN | nid-nts.n-store.kro.kr | 2026-04-21 | 2026-04-21 |
| DOMAIN | n-store.dynv6.net | 2026-04-21 | 2026-04-21 |
| DOMAIN | nid-gov.tax-store.kro.kr | 2026-04-21 | 2026-04-21 |
| DOMAIN | nts-login.n-auth.kro.kr | 2026-04-21 | 2026-04-21 |
| DOMAIN | n-store.nts-user.kro.kr | 2026-04-21 | 2026-04-21 |
| DOMAIN | anddynv6.net | 2026-04-21 | 2026-04-21 |
| DOMAIN | govkr-login.dynv6.net | 2026-04-21 | 2026-04-21 |
| DOMAIN | n-login.mydns.jp | 2026-04-21 | 2026-04-21 |
| DOMAIN | htax-login.n-cloud.kro.kr | 2026-04-21 | 2026-04-21 |
| DOMAIN | htax-store.dynv6.net | 2026-04-21 | 2026-04-21 |
| DOMAIN | nversg.mydns.jp | 2026-04-21 | 2026-04-21 |
| DOMAIN | n-user.dynv6.net | 2026-04-21 | 2026-04-21 |
| DOMAIN | htax-user.govkr.kro.kr | 2026-04-21 | 2026-04-21 |
| DOMAIN | mydns.jp | 2026-04-21 | 2026-04-21 |
| DOMAIN | nid-tax.mydns.jp | 2026-04-21 | 2026-04-21 |
| DOMAIN | ntdersg.mydns.jp | 2026-04-21 | 2026-04-21 |
| DOMAIN | n-user.htax-auth.kro.kr | 2026-04-21 | 2026-04-21 |
| DOMAIN | johnnytogdstudio.xyz | 2026-04-21 | 2026-04-21 |
| IPv4 | 158.247.210.58 | 2026-04-21 | 2026-04-21 |
| IPv4 | 158.247.219.150 | 2026-04-17 | 2026-04-21 |
| IPv4 | 158.247.250.37 | 2026-04-17 | 2026-04-21 |