National Museum
thegentlemenThis record tracks a ransomware attack claimed by the thegentlemen group against National Museum. 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 GAPWindow 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.
Attack Summary
***.dk zoominfo.com/c/national-museum/372526094 The National Museum of Denmark, located in the heart of Copenhagen, is the country's premier institution for cultural history, spanning from the Stone Age to the present day. It houses world-renowned archaeological treasures—including Viking hoards, the ancient Sun Chariot, and the Egtved Girl—alongside extensive global ethnographic collections. The museum is dedicated to exploring and sharing Denmark's rich heritage and global human history through engaging, research-driven exhibitions
Leak Screenshots
SAMPLEProof-of-breach screenshots the operator posted from the stolen data. Previews are redacted and locked — the originals are available on HaveIBeenRansom.