This record tracks a ransomware attack claimed by the
nova group against
Gruppe Lehnen. 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.
316days open
t1 · Published
t2 · Pending
Business Category
Communication / Marketing
Published
October 20, 2025
Disclosed / Notified
Not disclosed yet
Attack Summary
Wir bauen für Ihre Zukunft. Die Gruppe mit Stammsitz in Sehlem weist bereits 90 Jahre Erfahrung im Tief- und Straenbau auf. Als modernes und leistungsfhiges Familienunternehmen mit heute über 270 qualifizierten Mitarbeitern sind wir dank jahrzehntelanger Erfahrung zuverlssiger und kompetenter Partner im Tief- und Straenbau. Mit dem Laden des Videos akzeptieren Sie die Datenschutzerklrung von YouTube. Unser kompetentes und hochmotiviertes Team braucht Unterstützung. Sollten wir für ein Stellenangebot Ihr Interesse geweckt haben, so freuen wir uns auf Ihre schriftliche Bewerbung. Für weitere Informationen klicken Sie bitte auf das jeweilige Stellenangebot. Das Downloadcenter hlt immer die wichtigsten und aktuellsten Dokumente Für Sie bereit. Hier finden Sie die aktuellen Preislisten unserer Hartsteinwerke, die Prqualifizierungsbesttigung, Broschüren zum Leistungsspektrum, unsere gültigen Freistellungsbescheinigungen und noch vieles mehr. Schauen Sie einfach mal rein - 350 GB of documents stolen , get in touch by follow readme
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 aiidatapro.com
(matched from the company name)
— indexed by HaveIBeenRansom.
5
found in Infostealer logs
184+
found in Traditional breaches
4,816+
found in Ransomware leaks
Onclusive
play · ransomware
••• emails
limeleads_breach.7z
TheUnderground - Reborn · breach
••• emails
BulgarianNationalRevenueAgency_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
B F R e p o V 3 F i l e s · breach
••• emails
TheUnderground - Reborn · breach
••• emails
+ 12 more leak sources locked
Leak volumes are locked
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