Helldown
Since Aug 13, 2024, Helldown has listed 36 organizations on its leak site.
Listings per month
- Total listings
- 36
- First listing
- Aug 13, 2024
- Latest listing
- Nov 6, 2024
- MITRE ATT&CK techniques
- 0
Helldown is an aggressive ransomware group first documented in August 2024, known for exploiting Zyxel firewall vulnerabilities to gain initial access and conducting large-scale data exfiltration averaging 70 GB per victim, targeting IT services, telecommunications, manufacturing, and healthcare primarily in the US.
It posted no listings in the last 12 months.
Most targeted country: United States, with 9 listings (25% of the total).
Most targeted sector: Professional Services, with 9 listings (25% of the total).
Targeted countries
Showing 10 of 36 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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