U.S. tax decision agency Optima Tax Aid suffered a Chaos ransomware assault, with the risk actors now leaking knowledge stolen from the corporate.
Optima Tax Aid is a widely known U.S. tax decision and settlement agency that helps people and companies in addressing and fixing federal and state tax points. The corporate claims to be the nation’s main tax decision agency, having resolved over $3 billion in tax liabilities for shoppers.
Immediately, the Chaos ransomware gang added Optima Tax Aid to its knowledge leak web site, claiming to have stolen 69 GB of knowledge.
Supply: BleepingComputer
This knowledge accommodates what seems to be company knowledge and buyer case information. Tax paperwork generally comprise delicate private info, similar to Social Safety numbers, telephone numbers, and residential addresses, which can be utilized for malicious exercise by different risk actors or id theft.
Sources with data of the assault informed BleepingComputer that this was a double-extortion assault, with the risk actors not solely stealing knowledge from the corporate but additionally encrypting servers.
Chaos ransomware is a comparatively new ransomware operation that launched in March 2025, when it claimed 5 victims on its knowledge leak web site.
The ransomware gang ought to not be confused with The Chaos ransomware builder, which has been round since 2021 and used to create a myriad of branded encryptors utilized in phishing and malware campaigns.
Chaos ransomware additionally claimed to have breached the Salvation Military, which didn’t reply to our queries final week.
BleepingComputer contacted Optima Tax Aid with questions in regards to the assault and can replace the story if we obtain a response.
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