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Inactive · #135 by victimsRansomware group

Helldown

As of Oct 19, 2026, Helldown has listed 32 confirmed victims on its leak site since Aug 5, 2024, 0.1% of all victims tracked by Brandefense. Its most targeted country is United States (37.5% of its victims) and its most targeted sector is Consulting.

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.

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Confirmed Victims
32
Rank By Victims
#135
Last Leak-Site Post
Nov 6, 2024
Top Country
United States
Top Sector
Consulting

Victims Posted Per Month.

Helldown confirmed victims per month
MonthConfirmed victims
August 202417
September 20241
October 202410
November 20244
December 20240
January 20250
February 20250
March 20250
April 20250
May 20250
June 20250
July 20250
August 20250
September 20250
October 20250
November 20250
December 20250
January 20260
February 20260
March 20260
April 20260
May 20260
June 20260
July 20260
August 20260
September 20260
October 2026 (month in progress)0
Updated continuously · figures as of Oct 19, 2026

Latest Helldown Victims.

Search all 32 →
Latest confirmed leak-site victims claimed by Helldown
VictimCountryIndustryData claimedPosted
klinkamkurpark
klinik-am-kurpark.de
DEGermanyUnknownNot stated
AMERICANVENTURE
americanventures.com
USUnited StatesUnknownNot stated
CSIKBS
csikitchenandbath.com
USUnited StatesUnknownNot stated
SANJACINTOCOUNYUSUnited StatesUnknownNot stated
SMARTS-ENGINEER
smarts-engineering.de
DEGermanyUnknownNot stated
lacliniqueducoureur
lacliniqueducoureur.com
FRFranceMedia and EntertainmentNot stated

How They Operate.

Helldown's threat actor profile lists 27 ATT&CK techniques, 2 exploited CVEs, 8 malware and tools, with its targets and related actors.

TTPs, CVEs and malware →

Who Helldown Targets.

Sectors

  1. Consulting26.2%
  2. Education and Research13.1%
  3. Financial Services13.1%
  4. Hospitality and Tourism13.1%
  5. Manufacturing13.1%

Countries

  1. USUnited States1237.5%
  2. DEGermany515.6%
  3. ITItaly39.4%
  4. CHSwitzerland26.2%
  5. FRFrance26.2%
Shares are of this group's confirmed victims.

History.


  1. Busiest month on record: 17 confirmed victims

  2. First confirmed victim listed on its leak site

  3. Most recent leak-site post

  4. First seen in Brandefense data

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Figures as of Oct 19, 2026. Confirmed leak-site claims collected by Brandefense technologies and validated by Brandefense analysts.

Listed on a leak site means a ransomware group has claimed the company; it is not a confirmed breach. To request a correction or removal, contact Brandefense.