Was maddockhenson hit by ransomware?

maddockhenson was listed by the ALPHV/BlackCat ransomware operation (United States), and stolen data was published on the group's leak site. Darkfield tracks this disclosure with the original leak post, screenshot and group context.

Who is the ALPHV/BlackCat ransomware group?

ALPHV/BlackCat is a ransomware operator tracked by Darkfield. See the full operator dossier for its known victims, sectors targeted, IOCs and leak-site infrastructure.

What data was leaked in the maddockhenson breach?

ALPHV/BlackCat published data attributed to maddockhenson. Darkfield captured the leak post and a screenshot of the listing.

Ransomware victim disclosure

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maddockhenson

Claimed by ALPHV/BlackCat · listed 2 years ago

29m

Age

since listed · data leaked

Status timeline

ListedFeb 10, 2024
Data leakeddate unknown

At a glance

Group: ALPHV/BlackCat
Status: Data leaked
Country: United States
Listed on leak site: Feb 10, 2024

About the victim

AI dossier — public-source company profile

MaddockHenson PC is a Missouri-licensed accounting and tax services firm based in Saint Louis. They provide business accounting, bookkeeping, payroll, tax preparation, IRS representation, and QuickBooks consulting to small and mid-sized businesses, executives, and independent professionals.

Industry: Accounting & Tax Services
Address: 5353 S Lindbergh Blvd Ste 200, Saint Louis, MO 63126

Attack summary

Severity: medium — Accounting firm breach exposes sensitive financial and tax data of multiple clients (regulated PII at scale), but the leak post provides no proof files, no explicit confirmation of exfiltration, and no data size specification. Classification assumes data was exfiltrated given 'data_published' status, but lack of proof evidence limits confidence in severity.

ALPHV/BlackCat claims to have breached MaddockHenson PC. The leak post contains only the company's mission and values statement without explicit disclosure of what data was exfiltrated or whether encryption occurred.

medium

Data the group says was taken

AI dossier — extracted from the leak post

client financial records
tax preparation documents
business accounting information
payroll data
QuickBooks account information

What the group claims

OUR MISSION It is our mission to help businesses and individuals prosper by providing them with superior products, solutions, and services. OUR VALUES Our values are deeply rooted in “good ole fashioned” commitment. We enthusiastically invest the time needed to get to know you and your business thoroughly. MaddockHenson PC is committed to provide our clients with exceptional personal service and advice that delivers long term value. We believe our value is best demonstrated by our long-term relationships (many of them are third generation) and commitment to supporting our staff with education and professional development. A high level of standards and specialized staff training make a difference to ensuring every client receives a personal level of service. QUALITY As trusted advisors, we are available to assist our clients by providing insightful advice that helps them make informed financial decisions. If you have any questions or want to learn more about how we can help you achieve your financial goals, don’t hesitate to contact us today.

Sources

Victim sitemaddockhenson.com

Source

Indexed 2 years 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 ALPHV/BlackCat

ALPHV, also known as BlackCat or Noberus, is a sophisticated ransomware-as-a-service operation that emerged in November 2021 and quickly became one of the most prolific ransomware groups globally, driven by financial motivations and responsible for compromising over 930 victims worldwide. The group is believed to be operated by Russian-speaking cybercriminals and represents an evolution of the BlackMatter ransomware operation, operating under a RaaS model that recruits experienced affiliates from other disbanded ransomware groups. ALPHV employs a multi-faceted attack methodology utilizing various initial access vectors including compromised Remote Desktop Protocol credentials, phishing campaigns, and exploitation of unpatched vulnerabilities, followed by deployment of their Rust-based ransomware payload that supports both Windows and Linux environments, while consistently employing double extortion tactics that involve data theft prior to encryption and threats to publish stolen information on their leak site. Notable campaigns include high-profile attacks against critical infrastructure and major corporations across healthcare, finance, and energy sectors, with the group demanding ransoms ranging from hundreds of thousands to millions of dollars, prompting the FBI and CISA to issue multiple advisories warning of their targeting of critical infrastructure organizations. As of early 2024, ALPHV remains active despite ongoing law enforcement efforts, continuing to evolve their tactics and maintain their position as one of the most significant ransomware threats globally. The group has been linked to 1,662 public disclosures across our corpus. First observed on a leak site on September 9, 2021; most recent post March 3, 2024. The operation is currently inactive.

Also tracked as: ALPHV, BlackCat, Noberus.

Timeline of this disclosure

February 10, 2024maddockhenson listed by ALPHV/BlackCaton the group's public leak site

Other recent disclosures by ALPHV/BlackCat

ALPHV/BlackCat has been linked to 1,662 public victims on Darkfield. A sample of the most recent:

See the full ALPHV/BlackCat dossier →

Sector and geography

Geographically, maddockhenson is reported in United States, a country with 11,033 ransomware disclosures in our corpus.

If your organisation is affected

A listing by ALPHV/BlackCat means maddockhenson 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.
Report the incident to your national CERT, CISA (United States), as required for your jurisdiction.
Monitor for the data appearing on ALPHV/BlackCat'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.