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Inactive · #143 by victimsRansomware group

Onyx

As of Oct 19, 2026, Onyx has listed 28 confirmed victims on its leak site since Jul 11, 2025, 0.1% of all victims tracked by Brandefense. Its most targeted country is Brazil (3.6% of its victims).

Onyx is a ransomware group first observed in April 2022, based on the Chaos ransomware builder, that is notably destructive, files larger than 2MB are overwritten with random data rather than encrypted, making recovery impossible even after ransom payment, claiming approximately 13 victims across six countries.

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Confirmed Victims
28
Rank By Victims
#143
Last Leak-Site Post
Jul 11, 2025
Top Country
Brazil
Top Sector
Unknown

Victims Posted Per Month.

Onyx confirmed victims per month
MonthConfirmed victims
July 202528
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 Onyx Victims.

Search all 28 →
Latest confirmed leak-site victims claimed by Onyx
VictimCountryIndustryData claimedPosted
wayan.com.mx
wayan.com.mx
MXMexicoUnknownNot stated
cucafresca.com.br
cucafresca.com.br
BRBrazilUnknownNot stated
artisticstairs.com
artisticstairs.com
UnknownUnknownNot stated
candcfarmsupply.com
candcfarmsupply.com
UnknownUnknownNot stated
ackermanplumbinginc.com
ackermanplumbinginc.com
UnknownUnknownNot stated
semaphorehq.com
semaphorehq.com
UnknownUnknownNot stated

How They Operate.

Onyx's threat actor profile lists 1 malware and tools, with its targets and related actors.

TTPs, CVEs and malware →

Who Onyx Targets.

Sectors

No data for this window right now.

Countries

  1. BRBrazil13.6%
  2. MXMexico13.6%
Shares are of this group's confirmed victims.

History.


  1. First seen in Brandefense data

  2. Busiest month on record: 28 confirmed victims

  3. First confirmed victim listed on its leak site

  4. Most recent leak-site post

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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.