Ransomware group profile · #160 by claimed victims

Cephalus ransomware

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.

Active First seen Aug 2025

19Victims claimed on leak sites

0Victims in the last 30 days

0Victims in the last 90 days

5Countries hit

1Leak-site URLs tracked, 0 online

29 Aug 2025Latest claim recorded

Victimology

Who Cephalus claims to have breached, from 19 leak-site posts recorded by VULONE.

Claims per month last 12 months

Top sectors

Professional Services7

Healthcare5

Financial Services2

Technology2

Manufacturing1

Government & Defense1

Retail & E-Commerce1

Top countries

United States13

United Kingdom2

Ireland1

Netherlands1

Japan1

Latest claimed victims 12 most recent

Victim	Sector	Country	Claimed
One-LUX one-lux.com	Retail & E-Commerce	GB	29 Aug 2025
Shropdoc shropdoc.org.uk	Healthcare	GB	29 Aug 2025
Shelbourne Accountants shelbourneaccountants.ie	Financial Services	IE	29 Aug 2025
Delta Information Systems acroamatics.com	Technology	US	29 Aug 2025
Colorado Health Network Inc coloradohealthnetwork.org	Healthcare	US	28 Aug 2025
Texas Pregnancy Care Network texaspregnancy.org	Healthcare	US	28 Aug 2025
wilderlawfirm wilderlawfirm.com	Professional Services	US	28 Aug 2025
CoCo Yachts cocoyachts.com	Manufacturing	NL	28 Aug 2025
txpregnancy.org - Fake Abortion Clinics Exposed txpregnancy.org	Healthcare	US	26 Aug 2025
Town of Vienna, VA viennava.gov	Government & Defense	US	26 Aug 2025
Lewis Baach Kaufmann Middlemiss PLLC lbkmlaw.com	Professional Services	US	26 Aug 2025
Lee & Associates lee-irvine.com	Professional Services	US	26 Aug 2025

All 19 Cephalus 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 Cephalus 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 Cephalus ransomware still active?

Cephalus is tracked as active. The most recent leak-site claim VULONE recorded is dated 29 August 2025.

How many victims has Cephalus claimed?

VULONE has recorded 19 leak-site victim claims attributed to Cephalus since August 2025, across 5 countries and 7 sectors.

Which industries does Cephalus target?

The sectors most often named on the Cephalus leak site are Professional Services, Healthcare, Financial Services.

Which countries are most affected by Cephalus?

Most Cephalus victims recorded by VULONE are located in United States, United Kingdom, Ireland.

Where does VULONE get Cephalus 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].