This record tracks a ransomware attack claimed by the
coinbasecartel group against
SK Telecom. It collects the publicly disclosed attack details — sector, location and
timeline — as published on the operator's leak site and indexed by Breach House.
Window Zero
EXPOSURE GAP
Window Zero is the time the breach stayed in the open before
anyone said so — the gap between when the attack was first discovered
on the operator's leak site (t1) and when it was publicly disclosed (t2).
The wider this window, the longer victims, staff and customers were exposed with no warning.
-48days
t1 · Published
t2 · Disclosed
Country
Korea, Republic of
Business Category
Telecommunications
Published
September 15, 2025
Disclosed / Notified
Jul 30, 2025
Attack Summary
SK Telecom is a South Korean telecommunications company based in Korea and part of SK Group. It operates as a leading wireless carrier and also promotes services in telecommunications, media, AI, cloud, and connected intelligence. The company provides customer-facing network and digital infrastructure offerings through its official channels and investor materials. In threat-intelligence indexes, sktelecom.com was listed as a ransomware victim associated with coinbasecartel.
Leak Screenshots
SAMPLE
Proof-of-breach screenshots the operator posted from the stolen data. Previews are
redacted and locked — the originals are available on HaveIBeenRansom.
Dark Web Exposure
Findings for sktelecom.com
— indexed by HaveIBeenRansom.
578
found in Infostealer logs
2,994+
found in Traditional breaches
6+
found in Ransomware leaks
limeleads_breach.7z
TheUnderground - Reborn · breach
••• emails
Apollo.io DB 816millions.rar
Database World ROC · breach
••• emails
@BreachedData1 LinkedIn 2021-23 Cleaned.7z.001
Database World ROC · breach
••• emails
VerificationsIO_BF.7z.011
Kedr | Forum · breach
••• emails
pureincubation-com.7z.001
Database World ROC · breach
••• emails
Cit0day [cit0day.in] breaches.csv
LKnet reserve chat · breach
••• emails
AntiPublic_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
Dropbox_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
+ 17 more leak sources locked
Leak volumes are locked
Sign in to reveal how many records each source exposed and the remaining 20 sources.
Legal Disclaimer:
This ransomware victim record reflects information published on the operator's leak site.
Breach.house does not acquire, download, host, access or redistribute unlawfully obtained data. It indexes only publicly visible information posted by ransomware, breach and infostealer operators and open web sources, without accessing the underlying stolen content. The service supports public awareness, legitimate research and cyber-resilience.