Mann Group
thegentlemen listed this organization on its leak site on Oct 31, 2026.
- Listing date
- Oct 31, 2026
- Attack date
- Oct 26, 2026
Listing text
manngroup.com.au Mann Group is an Australian multi-disciplinary engineering and construction company founded in 1992 in Sydney, operating through eight subsidiaries including Mechtronic Engineering, Mann Fab, Mann Energy, Mann Enviro and Mann Solar. With 350 plus employees, it is Australia's leading provider of thermal, electrical, environmental and sanitary engineering solutions. The group covers pipe fabrication, structural steel, pressure vessels, industrial boilers, HVAC, waste-to-energy and renewable energy systems. Its headquarters and central workshop are located in Milperra, Sydney, with a financial year ending in June.
About the group
thegentlemen posted its first listing on Sep 9, 2025 and has listed 1,253 organizations to date.
The Gentlemen is a RaaS group that emerged in July–August 2025, rapidly claiming over 320 victims across 17+ countries by offering affiliates a 90% revenue share, deploying a Go-based locker against Windows, Linux, NAS, and BSD systems; a compromised C2 server in 2026 revealed more than 1,570 linked victims.
Learning center
What does this listing mean?
Ransomware groups move data out of the organization before encrypting systems and threaten to publish it if the ransom is not paid. This method is called double extortion.
The listing shows that the group claims to have targeted the organization. Whether the data was published is shown by the later status of the listing.
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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