Ransomware group profile · #120 by claimed victims

Helldown ransomware

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.

Active First seen Aug 2024

36Victims claimed on leak sites

0Victims in the last 30 days

0Victims in the last 90 days

17Countries hit

4Leak-site URLs tracked, 0 online

6 Nov 2024Latest claim recorded

Victimology

Who Helldown claims to have breached, from 36 leak-site posts recorded by VULONE.

Claims per month last 12 months

Top sectors

Professional Services9

Manufacturing6

Healthcare6

Technology5

Energy & Utilities3

Retail & E-Commerce3

Transportation2

Financial Services1

Top countries

United States9

Germany4

Italy3

Poland2

Switzerland2

United Kingdom2

Lebanon2

France2

Latest claimed victims 12 most recent

Victim	Sector	Country	Claimed
klinkamkurpark klinik-am-kurpark.de	Healthcare	DE	6 Nov 2024
hausdesstiftens.org hausdesstiftens.org	Healthcare	DE	6 Nov 2024
nightnurse.ch nightnurse.ch	Healthcare	CH	6 Nov 2024
fuelco fuelco-us.com	Energy & Utilities	—	6 Nov 2024
VALLEYFIRM valleyfirm.com	Professional Services	HK	6 Nov 2024
children generaldentistryforchildren.com	Retail & E-Commerce	IN	6 Nov 2024
knoxlawcenter knoxlawcenter.com	Professional Services	US	6 Nov 2024
AMERICANVENTURE americanventures.com	Professional Services	US	6 Nov 2024
CSIKBS csikitchenandbath.com	Retail & E-Commerce	JP	6 Nov 2024
SANJACINTOCOUNY co.san-jacinto.tx.us	Government & Defense	US	6 Nov 2024
compassfs compassfs.net	Financial Services	US	6 Nov 2024
lacliniqueducoureur lacliniqueducoureur.com	Healthcare	CA	6 Nov 2024

All 36 Helldown victims, searchable

Full victim list with claim posts, domains, timing and exports, plus the negotiation chats and leak-site screenshots VULONE archives for this crew.

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Tactics, techniques and procedures

ATT&CK technique mapping for Helldown is in progress. Victimology, infrastructure status and leak-site tracking are live above.

Indicators, detections and the full playbook

Hashes, C2 addresses, onion services, Sigma and YARA detections per technique, and the negotiation transcripts are available to signed-in analysts.

See full IOCs

Frequently asked

Is Helldown ransomware still active?

Helldown is tracked as active. The most recent leak-site claim VULONE recorded is dated 6 November 2024.

How many victims has Helldown claimed?

VULONE has recorded 36 leak-site victim claims attributed to Helldown since August 2024, across 17 countries and 9 sectors.

Which industries does Helldown target?

The sectors most often named on the Helldown leak site are Professional Services, Manufacturing, Healthcare.

Which countries are most affected by Helldown?

Most Helldown victims recorded by VULONE are located in United States, Germany, Italy.

Where does VULONE get Helldown victim data?

Claims are collected continuously from the group's own leak sites and cross-checked with ransomware.live and RansomLook. A claim is the group's assertion, not a confirmed breach.

Other ransomware groups

Victim claims are collected from leak sites and enrichment partners (ransomware.live, RansomLook) and represent the group's own assertions, not confirmed breaches. Profile last updated 16 September 2026. Questions or corrections: [email protected].