Disclosure context

About Braincipher

Braincipher is a recently emerged ransomware group that was first observed in July 2024, operating with apparent financial motivations and targeting organizations primarily across North America and Europe. The group's origin and potential affiliations remain largely undocumented by major threat intelligence organizations, though their targeting patterns suggest a broad opportunistic approach rather than nation-state backing, likely operating as an independent entity rather than through established ransomware-as-a-service infrastructure. Their attack methodology and specific technical capabilities have not been extensively documented by CISA, FBI, or major security research firms, though their victim distribution across 44 confirmed targets spanning business services, manufacturing, technology, and healthcare sectors indicates a generalist approach to target selection rather than sector-specific expertise. No major high-profile campaigns or significant law enforcement actions have been publicly documented against this group by reputable sources, suggesting either a relatively low-impact operational scale or insufficient intelligence collection on their activities. As of current reporting, the group's operational status remains unclear due to limited public documentation from established threat intelligence sources. The group has been linked to 56 public disclosures across our corpus. First observed on a leak site on July 1, 2024; most recent post May 13, 2026. The operation is currently active.

Also tracked as: brain cipher.

Timeline of this disclosure

October 29, 2025semag.fr listed by Braincipheron the group's public leak site

Sector and geography

This disclosure adds to ransomware activity in the Technology sector, which has 2,524 disclosures indexed across all operators we track. Geographically, semag.fr is reported in France, a country with 472 ransomware disclosures in our corpus.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.

Ransomware victim disclosure

← All victims

SEMAG

listed as semag.fr · Claimed by Braincipher · listed 7 months ago

Age

since listed · data leaked

Status timeline

Listed
Oct 29, 2025
Data leaked

At a glance

Group: Braincipher
Status: Data leaked
Country: France
Sector: Technology
Listed on leak site: Oct 29, 2025

About the victim

AI dossier — public-source company profile

SEMAG (Société d'Économie Mixte Aménageur de territoire) is a French mixed-economy company operating as a territorial developer, likely involved in urban planning, land development, and social/residential housing management in France. The public site indicates tenants pay rent through the company's online portal and that the company issues public procurement calls via a buyer profile. Its activities suggest a semi-public entity with local government ties.

Industry: Territorial Development & Social Housing

Attack summary

Severity: critical — Over 1 TB of data has been published via multiple onion download links. As a territorial developer and housing manager handling tenant rental payments and personal data, the likely exposure of regulated PII (tenant identities, financial/payment records) at scale meets the critical threshold. The data is confirmed published, not merely threatened.

Braincipher claims to have exfiltrated more than 1 TB of data from SEMAG, with multiple onion download links published, indicating the stolen data has already been made available for download. No encryption claim is explicitly stated, but the data is described as published.

critical

Data the group says was taken

AI dossier — extracted from the leak post

Exfiltrated company data (1+ TB)
Potentially tenant personal and financial records
Potentially public procurement documents
Potentially internal business documents

Original description

AI-summarised, not from the leak post

N/A

The leak post

captured from the group's site

We have more 1TB of data. If you think you are here by mistake, please contact us at [email protected] 
⏳ 11d 22h 39m 6s remaining 
Download: 3fg2gfwrdks46drwvejpgpak5klrflclsjjo35dxtqfk3poeez6oezad.onion If you think you are here by mistake, please contact us at [email protected] 
Download: emdnfl2fv32jhssxcbxlo6dzg2at4d7qbw2md6inz63qzdfgyln5cwyd.onion If you think you are here by mistake, please contact us at [email protected] 
Download: a4vbe7yp4kluped6khuhpr5nmzshiimx2jt5j22ozriiq6ngsm3fcpyd.onion If you think you are here by mistake, please contact us at [email protected] 
Download: x3nb7qcygpem2j5xzstyzdtgzofzkwkx4eko3ug4r73i6uhcgvyffjyd.onion If you think you are here by mistake, please contact us at [email protected] 
Download: 3frnhzcnlkjnw5q3tm6elzizinm2k3bmrtf2xwqjzpcxzeqwn2tv6wyd.onion If you think you are here by mistake, please contact us at [email protected] 
Download: 6ft2dfh26wm3w44orpjcgviutvfp25ez2iyh5ego5egvfmifrws7vvqd.onion If you think you are here by mistake, please contact us at [email protected] 
Download: zijgmuqjzb6dc7pofxhtaiz36qqyg35lhutybmzaz6whzgei2casjgid.onion If you think…

Sources

Source

Indexed 7 months ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.