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Ransomware Victim Financial Services

Chatham Asset Management

Ransomware attack by Worldleaks ยท Disclosed December 23, 2025 ยท ๐Ÿ‡บ๐Ÿ‡ธ United States

www.chathamasset.com

Date Disclosed
Dec 23, 2025
2025
Threat Group
Worldleaks
157 total victims
Country
๐Ÿ‡บ๐Ÿ‡ธ United States
Industry
Financial Services

Incident Analysis

Chatham Asset Management was targeted by Worldleaks ransomware, one of the most active ransomware groups in our database with 157 confirmed victims globally. The attack was disclosed on December 23, 2025, when Chatham Asset Management appeared on the group's dark web leak site.

Chatham Asset Management is based in United States , operating in the Financial Services sector. United States ranks #1 globally for ransomware attacks, with 8,402 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.

Worldleaks 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 โ€” 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: May 30, 2026 18:01 UTC.

Frequently Asked Questions

Was Chatham Asset Management attacked by ransomware?

Yes. Chatham Asset Management was listed as a victim of the Worldleaks ransomware group on December 23, 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 Chatham Asset Management?

Chatham Asset Management was attacked by Worldleaks ransomware. Worldleaks is one of the most active ransomware groups, having claimed 157 victims globally. The group typically employs a double-extortion model: encrypting the victim's files and threatening to publish stolen data.

When did the Chatham Asset Management ransomware attack occur?

The ransomware attack on Chatham Asset Management was disclosed on December 23, 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 Chatham Asset Management ransomware attack?

The specific data stolen from Chatham Asset Management 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, Chatham Asset Management likely held financial records, client data, and transaction histories.

How can organisations protect against Worldleaks attacks?

To defend against Worldleaks 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.