The Gentlemen
A ransomware group that appeared in summer 2025 and caused the most confirmed incidents in Japan in the first half of 2026. It targets smaller manufacturers and others, entering via business software flaws or stolen accounts.
- Alert level
- 2/ 5
- Reports & advisories (90 days)
- 0
- Known exploited CVEs
- 0
- Personal data leaked (disclosed)
- None confirmed
Attribution
- Notes Russian-speaking individuals may be involved — Cisco Talos
Exploited vulnerabilities and targeted products
If you run any of these products, first make sure they are updated to a fixed version.
How they attack
Entry
Exploiting internet-facing devices
Like finding a broken lock on the company's front gate (VPN or firewall) and walking in.
Entry
Logging in with stolen passwords
Like buying someone's staff badge on the black market and simply walking in the front door.
Inside
Destroying backups first
Like disabling the fire extinguishers and emergency exits before starting the fire.
Goal
Double extortion: encrypt and leak
Like locking your safe and also taking copies of the papers inside, threatening to publish them unless you pay.
Sources
Attributions are quoted as assessed by governments and security vendors. VulnPulse does not make attributions itself.
Leak counts only add up figures disclosed by the affected companies or authorities, never the attackers' own claims. We do not list victim names or link to leak sites.
The alert level is calculated automatically from reports and advisories in the last 90 days, known exploited vulnerabilities, and whether the group has targeted Japan.
Updated 2026-10-23 · daily