Optima Tax Relief hit by Chaos ransomware, 69 GB of data leaked
U.S.
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.
Connected intelligence
Signal brief
Follow the organization, likely method and potential impact to explore connected Shadow Tier intelligence.
Organization
- Published
- Jun 6, 2025
- Updated
- Jun 26, 2026
- Confidence
- Medium
- Evidence
- 3 sources
Structured assessment
Signal analysis
It helps compare this signal with other published signals without treating the labels as final determinations.
Threat source
Watch ransomware, endpoint compromise and business interruption exposure.
Business impact
- Impact area
- Confidentiality, Availability
- Likely asset
- User or customer data
Mentioned entities
Quick context
Questions about this signal
What happened in this signal?
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.
When was this signal reported?
Shadow Tier lists Jun 6, 2025 as the signal date.
Which organization is connected to this signal?
Optimataxrelief is the organization connected to this public signal.
Explore OptimataxreliefWhich attack pattern is relevant?
This signal is connected to current ransomware incidents based on its reported incident context.
Explore current ransomware incidentsWhich impact area is relevant?
This signal is connected to data exposure and breach intelligence based on its reported consequences.
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Japan’s Nikkei has confirmed a major data breach that potentially exposed the personal information of more than 17,000 employees and business partners after hackers infiltrated its internal Slack messaging platform. Australian privacy commissioner warns that the human factor is a growing threat as notifications caused by staff mistakes rose significantly even as total breaches declined 10% from a record high. Philippine bank BDO is shoring up its cyber security capabilities to protect its data and systems as it moves more services to the cloud and expands its physical presence into remote areas of the archipelago. The agency is working with IBM, the Government Technology Agency and the Cyber Security Agency of Singapore (CSA) to establish the full facts and ensure remedial measures are taken. 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