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Multiple Victims (KillSec 4.0 Batch)

listed as KillSec 4.0 · Claimed by Killsec · listed 9 months ago

9m
Age
since listed · data leaked

Status timeline

  1. ListedOct 4, 2025
  2. Data leakeddate unknown

At a glance

Group
Killsec
Status
Data leaked
Listed on leak site
Oct 4, 2025

About the victim

AI dossier — public-source company profile

This leak post is a batch disclosure by the KillSec ransomware group, branded as 'KillSec 4.0', containing claims against multiple distinct organizations spanning childcare software, fintech, adult content platforms, university admissions, medical diagnostics, mortgage technology, debt collection, real estate, legal services, behavior tracking, IT consulting, pet insurance, property management, online gambling, driving schools, travel booking, and micro-lending. The victims are located across the United States, United Kingdom, Belgium, Canada, South Korea, UAE, Morocco, Nigeria, and Thailand. The disclosure is a single post aggregating at least 17 separate company victims.

Industry
Multiple Industries (Batch Disclosure)

Attack summary

Severity: critical — The batch disclosure includes confirmed exfiltration with at least one published data sample (HappyTenant), explicit claims of 50,000+ PII records (ACT Driving Schools), financial loan records for 70,000+ individuals in a regulated lending context (Princeps Credit Systems), health and medical diagnostic data (Scanbo, BEHCA involving vulnerable populations in foster care and residential care), mortgage and financial workflow data (MortDash), and money transfer records (Cadorim). The breadth of re

KillSec claims to have exfiltrated data from at least 17 organizations across multiple sectors and countries, with at least one confirmed data sample published (HappyTenant, via a temp.sh download link). One entry (ACT Driving Schools) explicitly references over 50,000 PII records; Princeps Credit Systems references over 70,000 individuals served with financial data potentially at risk.

critical

Data the group says was taken

AI dossier — extracted from the leak post
  • Personally identifiable information (PII) — 50,000+ records (ACT Driving Schools)
  • Financial loan records and Credit Wallet data (Princeps Credit Systems)
  • Property management and tenant data (HappyTenant — sample published)
  • Medical diagnostic and health data (Scanbo)
  • Mortgage workflow and financial data (MortDash)
  • Childcare operational and attendance records (iCare Software)
  • Money transfer transaction records (Cadorim)
  • Content creator and subscriber data (op4Fans)
  • University admissions and student records (UwayApply)
  • Debt collection and logistics client records (FDB Collections)
  • Real estate client and property data (AX CAPITAL)
  • Legal and investigative case records (VTK Legal)
  • Behavioral and medical tracking data for vulnerable populations (BEHCA)
  • IT and business process data (Fractalite)
  • Pet insurance policyholder data (Rainwalk Technology)
  • Online casino player and crypto transaction data (BlockBets/lockBets)
  • Travel booking and passenger records (BusOnlineTicket Thailand)

The group's post references roughly 1 proof file.

What the group claims

N/A

The leak post

captured from the group's site
Founded in 1997, iCare Software, based in the United States, delivers innovative management solutions for childcare and afterschool programs. Serving childcare centers, preschools, afterschool programs, and multi-site operations, iCare automates critical tasks like attendance tracking, staff scheduling, tuition collection, and compliance reporting. Its unique offerings include AI-driven analytics, business intelligence dashboards, and CRM tools to boost enrollment and staff retention. With seamless data migration and robust back-end technology, iCare empowers providers to focus on quality care while streamlining operations and driving growth.
Cadorim simplifies money transfers to Mauritania, offering a secure, user-friendly platform for individuals and businesses. With a focus on speed, affordability, and accessibility, Cadorim enables seamless transactions in just three clicks, available around the clock. The company ensures maximum security for every transfer, provides competitive exchange rates with no fees, and processes transactions instantly. Headquartered in Brussels, Belgium, with operations in Nouakchott, Mauritania, Cadorim serves customers seeking reliable, cost-effectiv…

Sources

Source

Indexed 9 months ago

This page surfaces a public ransomware disclosure indexed by Darkfield. Original posts come from the operator's own leak site; we cross-check against ransomware.live, RansomLook and RansomWatch where applicable. Share this URL freely.

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Disclosure context

About killsec

killsec is a relatively new ransomware group that emerged in March 2024, operating with apparent financial motivations and demonstrating broad targeting across multiple geographic regions and industry sectors. The group's origin and potential state affiliations remain unclear due to limited public documentation from major threat intelligence sources, though their targeting pattern suggests opportunistic rather than geopolitically motivated operations. With 276 documented victims primarily concentrated in the United States, India, the United Kingdom, Brazil, and Belgium, killsec appears to focus heavily on healthcare, technology, business services, and financial sectors, indicating either specific tooling designed for these environments or opportunistic targeting of organizations with valuable data and high pressure to restore operations quickly. Given the group's recent emergence and the lack of detailed technical analysis from established cybersecurity firms like Mandiant or law enforcement advisories from CISA or FBI, specific details about their attack methodology, initial access vectors, encryption techniques, and extortion tactics have not been publicly documented in authoritative sources. The group remains active as of current reporting, though the limited intelligence profile suggests they may be either a smaller operation or one that has not yet attracted significant attention from major threat intelligence organizations despite their substantial victim count. The group has been linked to 281 public disclosures across our corpus. First observed on a leak site on March 21, 2024; most recent post June 3, 2026. The operation is currently active.

Timeline of this disclosure

  • October 4, 2025KillSec 4.0 listed by killsecon the group's public leak site

Other recent disclosures by killsec

killsec has been linked to 281 public victims on Darkfield. A sample of the most recent:

See the full killsec dossier →

If your organisation is affected

A listing by killsec means KillSec 4.0 appeared on a ransomware extortion site and data attributed to it has been published. If this is your organisation, or a supplier you depend on, the priority is to confirm the intrusion and contain it before the window to act closes.

  • Engage your incident-response team and preserve forensic evidence before remediating — do not wipe affected systems first.
  • Force a password reset and revoke active sessions for exposed accounts; rotate any credentials, API keys or certificates that may have been in the stolen data.
  • Assess regulatory notification duties (GDPR, NIS2, sector regulators) — many carry a 72-hour reporting clock from awareness.
  • Monitor for the data appearing on killsec's leak site and across paste and breach channels, and brief downstream partners who may be exposed through you.

How we know this. Darkfield monitors public ransomware leak sites continuously, archiving every new disclosure and the data later released against the victim. Each entry on this page is sourced from the operator's own publication and cross-checked against complementary OSINT feeds (RansomLook, ransomware.live, RansomWatch). We do not collect or host stolen data — only the metadata, timestamps and screenshots needed to make the public disclosure searchable and accountable. Records here are corrected when the original post is edited, retracted, or merged with another disclosure.