This record tracks a ransomware attack claimed by the
lockbit2 group against
siix.co.jp. 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.
-57days
t1 · Published
t2 · Disclosed
Published
November 21, 2021
Disclosed / Notified
Sep 26, 2021
Attack Summary
The organization siix.co.jp appears on the lockbit2 ransomware leak site. It operates in the Other sector. The affected entity is based in Japan. The incident was first observed on November 21, 2021.
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 siix.co.jp
— indexed by HaveIBeenRansom.
2
found in Infostealer logs
255+
found in Traditional breaches
3+
found in Ransomware leaks
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••• emails
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Database World ROC · breach
••• emails
linkedIN_2.7z.001
Database World ROC · breach
••• emails
Peatix_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
Cit0day [cit0day.in] breaches.csv
LKnet reserve chat · breach
••• emails
Dropbox_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
VerificationsIO_BF.7z.011
Kedr | Forum · breach
••• emails
OnlinerSpambot_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
+ 10 more leak sources locked
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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.