Underground
Since May 1, 2024, Underground has listed 26 organizations on its leak site.
Listings per month
- Total listings
- 26
- First listing
- May 1, 2024
- Latest listing
- Aug 15, 2025
- MITRE ATT&CK techniques
- 0
Underground ransomware is deployed by the Russia-based RomCom group (Storm-0978) and has victimized companies across multiple industries since July 2023 by exploiting CVE-2023-36884, encrypting files without changing extensions and deleting Volume Shadow Copies and Windows event logs in double-extortion campaigns.
It posted no listings in the last 12 months.
Most targeted country: United States, with 9 listings (35% of the total).
Most targeted sector: Technology, with 7 listings (27% of the total).
Targeted countries
Showing 10 of 26 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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Customer intelligence on top of Infostealer Detection: leaked accounts of end users who sign in to your site.