Mimori
Since Oct 20, 2026, Mimori has listed 4 organizations on its leak site.
Listings per month
- Total listings
- 4
- First listing
- Oct 20, 2026
- Latest listing
- Oct 20, 2026
- MITRE ATT&CK techniques
- 0
Mimori is a data-extortion / ransomware group first observed on 2026-10-20, when it launched a leak site and listed its first two claimed victims: OpenText (Canada, technology) and AVEVA (UK, industrial software), claiming 177,234 files from AVEVA. A third claimed victim, St. James's Place (UK, financial services), was reported on 2026-10-21. The leak site, mimori.group, is a clearnet domain fronted by Cloudflare that publishes victim pages under /organizations/<victim> and threatens to publish stolen data unless victims make contact. None of the claims has been independently verified. AVEVA and OpenText have each disclosed a separate security incident (unauthorized access to AVEVA's corporate SharePoint, and to an OpenText employee account through social engineering), but neither has attributed it to Mimori. No ransomware sample, encryptor or affiliate program has been publicly linked to the group, and its operators and any links to earlier groups are unknown.
It posted 4 listings in the last 12 months; the busiest month was October 2026 (4 listings).
Most targeted country: Canada, with 2 listings (50% of the total).
Most targeted sector: Technology, with 2 listings (50% of the total).
Targeted countries
Targeted sectors
Showing 2 of 4 results
Published reports on this actor:
- https://www.ransomware.live/group/Mimori
- https://www.ransomlook.io/group/Mimori
- https://www.breachsense.com/ransomware-groups/mimori/
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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