This record tracks a ransomware attack claimed by the
royal group against
Mainstream Engineering. 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.
1195days open
t1 · Published
t2 · Pending
Business Category
Manufacturing / Engineering
Disclosed / Notified
Not disclosed yet
Attack Summary
Mainstream Engineering was named by the royal ransomware group as a targeted organization. It operates in the Manufacturing / Engineering sector. The attack was first observed on April 18, 2023 and published on the group's leak site on March 09, 2023.
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 mainstream-engr.com
— indexed by HaveIBeenRansom.
0
found in Infostealer logs
720+
found in Traditional breaches
108+
found in Ransomware leaks
pureincubation-com.7z.001
Database World ROC · breach
••• emails
VerificationsIO_BF.7z.011
Kedr | Forum · breach
••• emails
limeleads_breach.7z
TheUnderground - Reborn · breach
••• emails
Apollo.io DB 816millions.rar
Database World ROC · breach
••• emails
Cit0day [cit0day.in] breaches.csv
LKnet reserve chat · breach
••• emails
Arandell Corp
medusa · ransomware
••• emails
OnlinerSpambot_BF.7z
B F R e p o V 3 F i l e s · breach
••• emails
Hedrick Brothers Construction
play · ransomware
••• emails
+ 17 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.