APT / THREAT GROUP💰 FINANCIAL

helldown

aliases

Intelligence Profile

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.

Threat Analysis

helldown is a known-sophistication threat actor of undetermined national origin, engaged in cyber operations with a primary motivation of financial.

Financially motivated threat actors like helldown prioritize monetary gain through methods such as ransomware deployment, banking trojans, cryptocurrency theft, BEC scams, or credential harvesting for resale on underground markets.

External References

→https://www.ransomlook.io/group/helldown

→https://www.truesec.com/hub/blog/helldown-ransomware-group

→https://blog.sekoia.io/helldown-ransomware-an-overview-of-this-emerging-threat

→https://hivepro.com/threat-advisory/new-helldown-ransomware-a-growing-threat-across-cross-platform-systems

→https://www.broadcom.com/support/security-center/protection-bulletin/helldown-ransomware

Quick Facts

TypeAPT / Threat Group

Motivation💰 financial

Aliases1

Also Known As

helldown

DLS Infrastructure

○ OFFLINEonyxcgfg4pjevvp5h34zvhaj45kbft3dg5r33j5vu3nyp7xic3vrzvad.onion

○ OFFLINEonyxcym4mjilrsptk5uo2dhesbwntuban55mvww2olk5ygqafhu3i3yd.onion

○ OFFLINEwww.helldown.org

○ OFFLINEonyxcb44xvqra35m3lp3z26kf2pxrlbn64nbzvyvzjyc3uykzrwcjdid.onion

Research Links

MITRE ATT&CK VirusTotal Google (news) Twitter/X search

Data sourced from Malpedia, Ransomware.live, RansomLook, and CTIWATCH OSINT collection. Actor attribution is based on available intelligence and may be incomplete.

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