`rubysen.com`

rubysen.com is a domain that 2 published sources report in connection with EtherHiding / UNC5342 and unclustered DPRK activity, which public reporting attributes to North Korea (DPRK). It is cited here from Chollima Hunter (on-chain observation) and Hokage Vanguard. The earliest of those reports is dated 2026-05-18 and the most recent 2026-05-22.

On-chain links

EtherHiding addresses that pointed malware at this host, newest first. Dates are when the value was written on-chain, and Transaction opens the one that first wrote it; a row without one is a tie a cited report states. See the EtherHiding Tracker.

Address	Transaction	Type	Role	Malware family	First written	Last written
`0x8d7e3cc5342439ff28c589a902b685ea4d398c12`	Etherscan	Wallet, ethereum	owner wallet	EtherRAT	2026-05-18	2026-05-18
`0xe26c57b7fa8de030238b0a71b3d063397ac127d3`	Etherscan	Contract, ethereum	mapping contract	EtherRAT	2026-05-18	2026-05-18

domain EtherHiding / UNC5342DPRK (cluster unattributed) CURATED

First seen 2026-05-18 · last seen 2026-05-22

Registration

Registered	2026-05-18
Registrar	Tucows Domains Inc.
Expires	2027-05-18
Last changed	2026-05-18
Status	client transfer prohibited, client update prohibited

From the registry’s RDAP record for rubysen.com, looked up 2026-10-05.

Sources

EtherRAT command-and-control host the operator wrote to the resolver contract 0xe26c57b7fa8de030238b0a71b3d063397ac127d3 on 2026-05-18. This is an on-chain observation by this site, not a value carried in published reporting. Registered on 2026-05-18, the day it was written, through Tucows with Njalla nameservers. Written six times that day; it postdates the report.
EtherRAT resolver contract 0xe26c57b7fa8de030238b0a71b3d063397ac127d3 — Chollima Hunter (on-chain observation) · published 2026-05-18 · pulled 2026-10-03
EtherRAT command-and-control host the operator wrote to the resolver contract 0xe26c57b7fa8de030238b0a71b3d063397ac127d3 on 2026-05-18. This is an on-chain observation by this site, not a value carried in published reporting. Registered on 2026-05-18, the day it was written, through Tucows with Njalla nameservers. Written six times that day; it postdates the report.
EtherRAT Blockchain C2 Infrastructure Attributed to Lazarus — Hokage Vanguard · published 2026-05-22 · pulled 2026-10-03

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Related indicators

Cited by the same report: EtherRAT resolver contract 0xe26c57b7fa8de030238b0a71b3d063397ac127d3

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Cited by the same report: EtherRAT Blockchain C2 Infrastructure Attributed to Lazarus

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