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Leak-site post naming Adviesbureau De Beuckelaer BV, captured by ThreatCluster
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Adviesbureau De Beuckelaer BV

braincipher

Ransomware leak-site victim intelligence

Data size
over 150 GB
Files
415,000
Posted
Aug 31, 2026
Countdown
Deadline: September 12, 2026 at 13:00
Country
NL
Industry
Professional Services

Summary

Written by ThreatClusterfrom site fields, file listing, victim profile, leak post, screenshot

BrainCipher claims to have exfiltrated over 150 GB comprising about 415,000 files from Adviesbureau De Beuckelaer BV, including financial data, personal data, health data (GDPR), copies of eID cards, and internal infrastructure. The leak page is listed and shows a countdown to a deadline of September 12, 2026 at 13:00. These details are presented as the group’s claims rather than as established fact.

Describes what the group claims on its leak site. A listing is not confirmation that a breach occurred.

What was taken

Adviesbureau De Beuckelaer BV

Data categories
Financial data for more than 430 clients, financial statements, turnover figures, and banking informationPersonal data of individualsHealth data (GDPR)Copies of eID cardsAnd the company’s internal infrastructure.

Also stated on the leak page

Fields this group publishes that do not map to a standard column. Labels are the site's own.

contact
[email protected]
Deadline
September 12, 2026 at 13:00
Download
gkwqyosd75hpu72jfalfo7xepdebl5p5rhorbxzfwswyg53jckg7wxad.onion

Leak-site images (2)

Images from the victim's leak listing. Thumbnails scraped from the onion page are blurred by default — click a thumbnail to view.

ThreatCluster capture
onion leak page6.6 KB

Negotiation
Email [email protected]
Onion gkwqyosd75hpu72jfalfo7xepdebl5p5rhorbxzfwswyg53jckg7wxad.onion