Brotherhood
Since Oct 10, 2025, Brotherhood has listed 18 organizations on its leak site.
Listings per month
- Total listings
- 18
- First listing
- Oct 10, 2025
- Latest listing
- Jan 6, 2026
- MITRE ATT&CK techniques
- 0
Brotherhood is a ransomware group that emerged in late 2025, targeting organizations in the US, Canada, and Australia across manufacturing, communications, and construction sectors, operating a Tor-based double-extortion leak site.
It posted 2 listings in the last 12 months; the busiest month was December 2025 (1 listings).
Most targeted country: United States, with 7 listings (39% of the total).
Most targeted sector: Professional Services, with 7 listings (39% of the total).
Targeted countries
Showing 10 of 18 results
What does a ransomware group do?
Ransomware groups break into corporate networks, move data out and encrypt systems. If the ransom is not paid, they list the organization on a leak site and threaten to publish the data.
What should you do if your organization is listed on a leak site?
- Record the listing and any published sample files; do not visit the leak site from the corporate network.
- Isolate affected systems and preserve logs without deleting them.
- Determine which data left the organization; if personal data is involved, review notification obligations with your legal team.
- Make any decision about the ransom demand together with legal, management and incident response.
- Do not bring systems back online before the attacker’s entry point is closed.
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