BrainCipher
Since Jul 1, 2024, BrainCipher has listed 126 organizations on its leak site.
Listings per month
- Total listings
- 126
- First listing
- Jul 1, 2024
- Latest listing
- Nov 6, 2026
- MITRE ATT&CK techniques
- 5
Brain Cipher emerged in July 2024. Both Windows and Linux variants are available. Brain Cipher using the leaked build of LockBit Black for their operations. The group suspected to have exploited CVE-2023-28252 (Microsoft Windows CLFS Driver Privilege Escalation Vulnerability). The Ransom demand ranges from $150,000 to $1,00,0000. Demand to be paid with Monero (XMR) cryptocurrency. In 2025, they have shifted their new Negotiation portal to new server with vanity TOR Domain starting with 'brain'.
It posted 82 listings in the last 12 months; the busiest month was September 2026 (19 listings).
Most targeted country: United States, with 48 listings (38% of the total).
Most targeted sector: Professional Services, with 33 listings (26% of the total).
Targeted countries
Showing 10 of 126 results
5 MITRE ATT&CK techniques across 4 stages are documented in the group's attacks.
- 1
Execution
Malicious code runs on the target system.
T1204.002User Execution - 2
Defense evasion
Security software and logging are bypassed.
T1070.004Indicator Removal: File DeletionT1562.001Impair Defenses: Disable or Modify Tools - 3
Discovery
Systems, accounts and data on the network are mapped.
T1083File and Directory Discovery - 4
Impact
Systems are encrypted or services are stopped.
T1486Data Encrypted for Impact
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.
Which defenses matter most?
Priority defenses based on the documented techniques:
- Allow scripts and macros only for users who need them, and keep behavioral rules enabled in endpoint protection.
- Alert when security software is disabled or logs are cleared.
- Monitor accounts that run many queries in a short time and unusual network scans.
- Keep offline, immutable backups and test restores regularly.
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.
Is your organization mentioned?
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