high severity August 31, 2024 · 4 min read Unverified claim — what this is

John W. Brooker & Co., CPAs Listed by Cicada3301 Ransomware Group

If you are a customer of John W. Brooker & Co., CPAs, here’s what is being claimed, and what it would mean for you.

Financial success is best achieved when the financial advisors know your business, your goals, and you personally. Planning with a team is much more coordinated than planning by a list of contacts. For 42 years, John W. Brooker & Co., CPAs has been providing integrated services to medical and dental professionals, as well as other service professionals. We like to say we are a one-stop shopping for financial statements, tax planning, business consulting, financial planning, wealth management, and pension design and administration. Our clients love the efficiency and personal attention t
— from Cicada3301’s own leak-site posting. This is the group’s claim, quoted verbatim; it is not GalaxyWarden’s reporting and has not been independently verified.

John W. Brooker & Co., CPAs Listed by Cicada3301 Ransomware Group

On August 31, 2024, accounting firm John W. Brooker & Co., CPAs appeared on the leak site of the cicada3301 ransomware group. The listing states that internal files were exfiltrated during a ransomware attack on the 42-year-old practice that serves medical, dental, and other professional clients with tax planning, financial statements, wealth management, and pension administration services. The number of individuals whose data was taken remains unknown, and the leak-site listing does not detail the specific documents posted.

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Reported Details from the Listing

The primary disclosure on the cicada3301 onion site, archived via ransomware.live, states that John W. Brooker & Co., CPAs suffered a ransomware incident resulting in data exfiltration. It lists the firm under its public name and states that internal files were taken. No client count, no exact volume of records, and no sample documents are shown in the initial public listing. The disclosure indicates the data is now held by the group for extortion purposes, a standard step once negotiations fail or deadlines pass.

Because the firm handles sensitive financial and tax information for medical and dental practices, the exposed files likely contain client names, addresses, Social Security numbers, tax returns, income details, and banking information, though the listing itself does not enumerate these data types.

Why This Matters for You and Your Family

If you or anyone in your household has used John W. Brooker & Co., CPAs for tax preparation, pension planning, or wealth management, your personal financial data may now sit in a ransomware actor’s repository. Medical and dental professionals and their families are disproportionately affected because the firm specializes in those fields. A single breach like this can expose years of tax filings, investment accounts, and Social Security numbers that criminals can weaponize for identity theft, fraudulent loan applications, or targeted phishing.

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What the free scan actually returns

Sample resultyou@email.comIllustrative — not a real person

Found on people-search siteswe remove these

These listings are live, public, and legal to remove — and removing them is what we do.

value redacted in this sampleage, relatives, address historySpokeo

value redacted in this samplephone, household, property recordsBeenVerified

value redacted in this sample580 companies checked

Found in breach recordsverifiedreported — unverified

Each record is labeled: confirmed breach data, or an attacker’s claim no one has verified.

verifiedvalue redacted in this samplepassword + phone · 2024telecom breach

unverifiedvalue redacted in this sampleclaimed in ransomware listing · 2026leak-site claim

Leaked data cannot be deleted from the internet — anyone claiming otherwise is lying. Broker listings can be removed. We do the second, and show you exactly what to fix from the first.

Report details & sourcing

Attributed to Cicada3301 · 75 incidents tracked →

Severity High the filing does not enumerate what was exposed

Disclosed August 31, 2024

Last reviewed August 8, 2026

Affected Unconfirmed

By GalaxyWarden Threat Research · Editorial & sourcing standards

Unverified claim — what this report is

This page documents a public listing on a ransomware/extortion group’s leak site, tracked via public threat-intelligence sources. A listing is the attacker’s claim. GalaxyWarden aggregates and reports such claims; we have not independently verified that a breach occurred, what data (if any) was taken, or the accuracy of anything the group asserts, and the named organisation has not necessarily confirmed the incident. Sections above describe what the listing shows and the group’s documented history — not verified findings about the named organisation. If you represent this organisation and believe anything here is inaccurate, tell us and we’ll review it promptly.

Editorial & sourcing policy

GalaxyWarden is a breach-monitoring service and news aggregator. We do not exfiltrate, host, purchase, or redistribute stolen data. Breach information is compiled from publicly accessible sources and threat-intelligence platforms, and is reported as claims attributed to their source. We promptly correct or remove material shown to be inaccurate — see our content & takedown policy or write to support@galaxywarden.com.

Threat-actor tracker

Cicada3301 — 75 incidents tracked

Every breach we've attributed to Cicada3301, in one running log. See who else they've hit →

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