Kyber
Since Jul 30, 2026, Kyber has listed 1 organizations on its leak site.
Listings per month
- Total listings
- 1
- First listing
- Jul 30, 2026
- Latest listing
- Jul 30, 2026
- MITRE ATT&CK techniques
- 0
Kyber is a recently identified ransomware group using sophisticated hybrid encryption (AES-256-CTR with X25519 and Kyber1024), operating Tor-based communication channels and employing double-extortion with free partial decryption offered to build negotiation trust, discovered through underground forum monitoring in 2025.
It posted 1 listings in the last 12 months; the busiest month was July 2026 (1 listings).
Most targeted country: United States, with 1 listings (100% of the total).
Most targeted sector: Government & Defense, with 1 listings (100% of the total).
Targeted countries
Targeted sectors
Showing 1 of 1 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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