Cyber Threat Intelligence
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Ransomware Victim Financial Services

Bells Tax Service

Ransomware attack by Blacklock · Disclosed May 16, 2025 · 🇺🇸 United States

bellstaxservice.com

Date Disclosed
May 16, 2025
2025
Threat Group
Blacklock
64 total victims
Country
🇺🇸 United States
Industry
Financial Services

ThreatAI Analysis

Compiled from this incident record and the threat intelligence profile for Blacklock. Figures and technique mappings are quoted from the source data, not inferred.

About the Blacklock group

BlackLock is a rebranded version of another ransomware group known as Eldorado. It has since become one of the most active extortion syndicates in 2025, heavily targeting technology, manufacturing, construction, finance, and retail sectors. Blacklock has listed 64 victims since November 2023.

Incident Analysis

Bells Tax Service was targeted by Blacklock ransomware, one of the most active ransomware groups in our database with 64 confirmed victims globally. The attack was disclosed on May 16, 2025, when Bells Tax Service appeared on the group's dark web leak site.

Bells Tax Service is based in United States , operating in the Financial Services sector. United States ranks #1 globally for ransomware attacks, with 9,540 victims in our database.

Sector context: Financial sector organisations are targeted for their access to funds, sensitive financial data, and the reputational damage a public breach can cause. Regulatory requirements also increase recovery costs.

Blacklock typically employs a double extortion model: first exfiltrating sensitive data from the victim's systems, then deploying ransomware to encrypt files. Victims face two simultaneous threats — paying to restore access and paying to prevent publication of stolen data. The group's leak site publishes victim names and exfiltrated data as leverage.

Data source: This incident record is sourced from public ransomware group leak site disclosures aggregated via the ransomware.live API. Disclosure date reflects when the victim was published on the leak site, which may differ from the initial date of compromise. This platform does not publish or link to stolen data. Last data update: Sep 20, 2026 20:00 UTC.

Frequently Asked Questions

Was Bells Tax Service attacked by ransomware?

Yes. Bells Tax Service was listed as a victim of the Blacklock ransomware group on May 16, 2025. The organisation is based in United States and operates in the Financial Services sector. The disclosure appeared on the group's dark web leak site.

Which ransomware group attacked Bells Tax Service?

Bells Tax Service was attacked by Blacklock ransomware. Blacklock is one of the most active ransomware groups, having claimed 64 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the Bells Tax Service ransomware attack occur?

The ransomware attack on Bells Tax Service was disclosed on May 16, 2025. This date reflects when the victim was published on the threat group's leak site, which may differ from the actual date of initial compromise.

What data was stolen in the Bells Tax Service ransomware attack?

The specific data stolen from Bells Tax Service has not been independently verified by this platform. Ransomware groups typically exfiltrate data before encrypting systems and use the threat of publication to pressure victims. As a Financial Services organisation, Bells Tax Service likely held financial records, client data, and transaction histories.

How can organisations protect against Blacklock attacks?

To defend against Blacklock and similar threat actors, organisations should: maintain regular offline backups tested for restoration; implement network segmentation to limit lateral movement; deploy multi-factor authentication on all remote access; use endpoint detection and response (EDR) tools; conduct regular phishing and security awareness training; and monitor threat intelligence feeds for indicators of compromise (IOCs) associated with active groups.