FulcrumSec
Since May 1, 2026, FulcrumSec has listed 31 organizations on its leak site.
Listings per month
- Total listings
- 31
- First listing
- May 1, 2026
- Latest listing
- Oct 23, 2026
- MITRE ATT&CK techniques
- 0
FulcrumSec is a data extortion group active since approximately September 2025, specializing in high-speed exfiltration of cloud-hosted databases by exploiting unrotated API keys and misconfigured cloud permissions rather than deploying encryption, with known victims including Australian fintech youX and LexisNexis.
It posted 31 listings in the last 12 months; the busiest month was May 2026 (23 listings).
Most targeted country: United States, with 15 listings (48% of the total).
Most targeted sector: Technology, with 12 listings (39% of the total).
Targeted countries
Showing 10 of 31 results
Published reports on this actor:
- https://www.resecurity.com/blog/article/cybercriminals-are-targeting-edtech-data-breaches-and-ransomware-attacks-on-the-rise
- https://blog.bushidotoken.net/2026/06/uk-cybercrime-journal-arup-group.html
- https://www.techrepublic.com/article/news-novo-nordisk-1-3tb-theft-25m-demand-emea/
Source: MISP Galaxy, Malpedia.
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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