Optima Tax Relief hit by Chaos ransomware, 69 GB of data leaked
U.S. tax resolution firm Optima Tax Relief was hit by a double-extortion ransomware attack by the Chaos group. The ransomware group claimed responsibility and posted about the incident on the dark web on June 6, 2025, stating they stole 69 gigabytes of sensitive corporate and client data. This data included tax documents, Social Security numbers, phone numbers, and home addresses. The company later began notifying impacted clients in August 2025.
Signal context
First seen: Jun 6, 2025
Last updated: Jun 26, 2026
Status: Public signal
Key points
- Double-extortion ransomware attack by Chaos group.
- Chaos group claimed responsibility and leaked data on the dark web on June 6, 2025.
- 69 gigabytes of sensitive corporate and client data stolen.
Signal analysis
BetaIt helps compare this signal with other published signals without treating the labels as final determinations.
Likely country: Location not provided
Watch ransomware, endpoint compromise and business interruption exposure.
- Source type: outside the affected organization
Impact area: Confidentiality, Availability
Likely asset: User or customer data
- 1 signal in the same sector
- 100 signals with the same likely impact area
- 1 signal linked to this organization/domain
External sources
PRIVACY ALERT: Optima Tax Relief Under Investigation for Data Breach of Recordshttps://www.classactionlawyers.com/optimaPublic source from classactionlawyers.com.
Optima Tax Relief Data Breach Affects 19K Individuals: SSNs and financial infohttps://www.consumerprivacyrights.com/optima-tax-relief-data-breach-affects-19k-individuals-ssns-and-financial-info/Public source from consumerprivacyrights.com.
Major Cyber Attacks, Ransomware Attacks and Data Breaches of June 2025https://www.riskxchange.com/blog/major-cyber-attacks-ransomware-attacks-and-data-breaches-of-june-2025/Public source from riskxchange.com.
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