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Inactive · #145 by victimsRansomware group

Cephalus

As of Oct 19, 2026, Cephalus has listed 27 confirmed victims on its leak site since Jun 28, 2025, 0.1% of all victims tracked by Brandefense. Its most targeted country is United States (66.7% of its victims) and its most targeted sector is Technology.

Cephalus is a ransomware group active from mid-2025 that leverages stolen RDP credentials to deploy a Go-based ransomware payload via DLL sideloading, targeting law firms, healthcare, financial services, and IT firms across the US and Japan with 19 known victims.

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Confirmed Victims
27
Rank By Victims
#145
Last Leak-Site Post
Aug 29, 2025
Top Country
United States
Top Sector
Technology

Victims Posted Per Month.

Cephalus confirmed victims per month
MonthConfirmed victims
June 20251
July 20250
August 202526
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 Cephalus Victims.

Search all 27 →
Latest confirmed leak-site victims claimed by Cephalus
VictimCountryIndustryData claimedPosted
One-LUX
one-lux.com
GBUnited KingdomUnknownNot stated
One-LUX
one-lux.com
GBUnited KingdomUnknownNot stated
Shropdoc
shropdoc.org.uk
GBUnited KingdomUnknownNot stated
Shropdoc
shropdoc.org.uk
GBUnited KingdomUnknownNot stated
Shelbourne Accountants
shelbourneaccountants.ie
IEIrelandUnknownNot stated
Shelbourne Accountants
shelbourneaccountants.ie
IEIrelandUnknownNot stated

How They Operate.

Cephalus's threat actor profile lists 3 ATT&CK techniques, 12 malware and tools, with its targets and related actors.

TTPs, CVEs and malware →

Who Cephalus Targets.

Sectors

  1. Technology311.1%
  2. Telecommunications27.4%
  3. Construction13.7%
  4. Consulting13.7%
  5. Government and Public Sector13.7%

Countries

  1. USUnited States1866.7%
  2. GBUnited Kingdom414.8%
  3. IEIreland27.4%
  4. NLNetherlands27.4%
  5. JPJapan13.7%
Shares are of this group's confirmed victims.

History.


  1. First confirmed victim listed on its leak site

  2. Busiest month on record: 26 confirmed victims

  3. First seen in Brandefense data

  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.