Global law firm Jones Day confirms cyber attack and client data access
Jones Day acknowledged that an “unauthorised third party accessed a limited number of dated files for 10 clients” and that all affected clients have been notified.
Key points
- Confirmed a "phishing incident" affecting client files.
- Unauthorized access to dated files for 10 clients.
- Silent Ransom Group claimed responsibility.
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Signal brief
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Organization
- Published
- Apr 7, 2026
- Updated
- Jul 22, 2026
- Confidence
- Medium
- Evidence
- 2 sources
Structured assessment
Signal analysis
This analysis groups the signal by industry, likely incident action and impacted security area. It helps compare this signal with other published signals without treating the labels as final determinations.
Threat source
The feed marks multiple actor roles. Treat this as a review signal rather than a final attribution.
- Source type: possible insider or internal misuse
- Source type: supplier or third-party involvement
Business impact
- Impact area
- Availability
Mentioned entities
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What happened in this signal?
Jones Day acknowledged that an “unauthorised third party accessed a limited number of dated files for 10 clients” and that all affected clients have been notified. The attackers claimed they focused on the head of the firm’s Federal Circuit team, supposedly referring to Greg Castanias. Jones Day declined to identify the clients or the specific files involved, displaying the kind of attention to secrecy that could’ve avoided this whole problem to begin with. The attack has been attributed to the Silent Ransom Group , also known as Luna Moth, Chatty Spider, and UNC3753 — all excellent garage band names for anyone in the market. According to an FBI alert last May , SRG has been targeting law firms specifically since 2023. But that was before the federal law enforcement agency embarked on a half-baked loyalty purge and reassigned the remaining agents to rounding up roofers and threatening people for making fun of Trump on Instagram . Today, the FBI exists mostly as a luxury travel agent for Kash Patel to slam beers with hockey players . As a bulwark against cybercrime, the FBI is essentially an offensive lineman who immediately turns around and yells “incoming!” at the quarterback. Filevine’s New Legal AI Platform LOIS Turns AI Into A True Legal Coworker Legal work isn’t slowing down, and the firms that win won’t be the ones working harder — they’ll be the ones working smarter. Jones Day confirms cyber attack after hackers access client files Jones Day has become the latest high-profile law firm to fall victim to a cyber attack, after hackers accessed files linked to a number of client matters. The US firm — which represented Donald Trump in both his 2016 and 2020 presidential campaigns and has placed several of its lawyers into senior White House and Justice Department roles — confirmed it had experienced a “phishing incident” in which “unauthorised third party accessed a limited number of dated files for 10 clients.” All affected clients have been notified, though the firm declined to name either them or the specific files involved. The attack has been linked to the Silent Ransom Group, which has claimed responsibility for the breach. Reuters reports that the group published a file directory and screenshots of purported negotiations with Jones Day representatives, and is said to have specifically targeted Greg Castanias, a senior Washington-based partner who leads the firm’s Federal Circuit practice. Jones Day has found itself in the crosshairs before, and in 2021 the firm was among several major companies caught up in a hack of file transfer software linked to a separate ransomware group. Jones Day is one of a number of major law firms to have been targeted in recent years. Allen & Overy was hit by an attack linked to the LockBit ransomware group in 2023, before its merger with Shearman & Sterling, though the firm was later quietly removed from the group’s website without explanation. Quietly removed from the website suggests that a ransom might have been paid. Solicitor pretended to be police officer to spy on ex at Nando’s City lawyer charged with insider dealing Food company posts eye-catching job ad seeking corporate lawyer with ‘gravitas of a senior partner’ for unpaid role
When was this signal reported?
Shadow Tier lists Apr 7, 2026 as the signal date.
Which organization is connected to this signal?
Jonesday is the organization connected to this public signal.
Explore JonesdayWhich attack pattern is relevant?
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Healthcare AI Company Xsolis Suffers Data Breach Impacting 1.4 Million Individuals
Healthcare technology company Xsolis, Inc. has disclosed a data breach affecting nearly 1.4 million individuals. Tennessee-based Xsolis provides utilization management and revenue cycle solutions for hospitals, health systems, and payers. The company published a data security notice in early June, revealing that unauthorized activity was detected on its systems on January 22. The intrusion resulted from a targeted phishing attack carried out two days earlier. According to Xsolis, the hackers gained access to files storing personal and protected health information received by the company from its clients, including names, dates of birth, addresses, SSNs, health insurance information, and medical treatment information. While the data breach was disclosed two weeks ago, the US Department of Health and Human Services (HHS) has now disclosed the number of affected individuals. The Xsolis cybersecurity incident was added to the HHS data breach tracker on Monday, with the number of affected individuals listed as 1,396,519. Advertisement. Scroll to continue reading. No known ransomware group appears to have taken credit for the attack on the healthcare tech company. SecurityWeek has asked Xsolis whether it was targeted in an extortion attempt and, if so, whether a ransom has been paid. The company’s disclosure indicates that it’s “not aware of any actual or attempted misuse of information because of this incident”. It’s not uncommon for healthcare-related data breaches to affect millions of people. One recent example is the incident involving the dental benefits administrator DentaQuest , in which hackers stole information from 2.6 million accounts. Related : Millions Impacted Across Several US Healthcare Data Breaches Related : 266,000 Affected by Data Breach at Radiology Associates of Richmond Related : Oncology Institute Discloses Data Breach Written By Eduard Kovacs Eduard Kovacs (@EduardKovacs) is senior managing editor at SecurityWeek. He worked as a high school IT teacher before starting a career in journalism in 2011. Eduard holds a bachelor’s degree in industrial informatics and a master’s degree in computer techniques applied in electrical engineering. 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CodeSecCon bridges the gap between dev and security. Discover best practices for secure coding, innovative risk-reduction tools, and safe AI integration to cultivate a true DevSecOps culture. Safely secure your apps! Xsolis breach exposes personal and health data of 1.4 million people Healthcare technology company Xsolis has disclosed a data breach impacting nearly 1.4 million individuals following a phishing attack. The Tennessee-based firm, which provides utilization management and revenue cycle solutions for healthcare providers, became aware of unauthorized access on January 22, 2026, after a phishing attack two days prior. The breach exposed personal and protected health information received from Xsolis’s hospital and payer clients, as reported by Security Affairs. The security incident, which occurred on January 20, 2026, allowed an unauthorized actor to acquire files containing sensitive information. This data may include names, addresses, dates of birth, Social Security numbers, health insurance details, and medical treatment information. Xsolis has launched an investigation, reported the incident to law enforcement, and is implementing enhanced security measures. Affected individuals are being notified by mail and offered free credit monitoring and identity protection services, along with access to a toll-free call center. The U.S. Department of Health and Human Services reported that 1,396,519 individuals were affected. No ransomware group has claimed responsibility for the attack at this time.
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Singapore Land Authority Data Breach Exposes 70,000 Records via IBM Testing Environment
Singapore Land Authority data breach exposes 70,000 records after IBM testing environment compromised SINGAPORE, July 3 — Personal data belonging to about 70,000 individuals has been compromised in a cybersecurity incident involving the Singapore Land Authority (SLA) and a cloud environment managed by IBM. SLA said the breach stemmed from unauthorised access to a dataset created for vendor development and systems integration testing, CNA reported. IBM oversees the testing environment for the Singapore Titles Automated Registration System (STARS) and eLodgment System (ELS), which are used to submit property transfer and caveat documents. Preliminary checks showed the dataset, first created in 1998 and updated periodically, was intended to contain only mock and anonymised records. It was later discovered to include real information such as names, NRIC numbers and past property addresses of around 70,000 people. SLA stressed that the affected environment is separate from its live operational systems, adding that property ownership and lodgment records in STARS and ELS remain secure. IBM has revoked access to the compromised system to prevent further unauthorised entry. As a precaution, SLA has begun notifying affected individuals and advising them on assistance measures. The authority said it is working with IBM, the Government Technology Agency of Singapore and the Cyber Security Agency of Singapore to investigate the incident and implement remedial steps. According to CNA, a police report has been lodged and the Personal Data Protection Commission has been notified. SLA has not yet disclosed when the breach occurred or how many affected individuals have been contacted. Singapore’s first dedicated hospital for native wildlife opens at Mandai Singapore bookie aged 69 jailed for illegal betting on Hong Kong horse races Fatal dispute between Singapore Redhill flat neighbours leads to murder charge PDRM prepares security operations for Negeri Sembilan state election Defence weighs AGC appeal for driver in fatal Klang crash Amirudin: Pakatan banks on micro-campaign strategy to win over Negeri Sembilan voters ÑеÑгей ÑаÑанÑÑа - stock.adobe.com The Singapore Land Authority (SLA) has revealed that the personal information of about 70,000 individuals was exposed following unauthorised access to a cloud environment managed by IBM, its technology supplier. IBM was appointed to support and maintain SLA’s Singapore Titles Automated Registration System (Stars) and eLodgment System (ELS), which underpin property title registration and the lodgement of property documents in the city-state. As part of that work, the supplier managed the development and systems integration testing environment for the two systems. In a statement on 3 July 2026, SLA said it had been informed by IBM of the incident, with preliminary investigations indicating that a dataset created solely for development and testing purposes had been accessed without authorisation. The dataset, created in 1998 and updated periodically over the years, was meant to contain only mock and anonymised testing data based on property ownership and lodgement records. However, SLA said it has since uncovered that the dataset also contained the names, National Registration Identity Card (NRIC) numbers and property addresses of the affected individuals at the time. “This information should have been anonymised but was not,” the agency said, adding that investigations are ongoing to determine how this occurred. SLA noted that the affected environment is “distinct and separate” from its operational systems, with no connection to, or compromise of, the live systems that run Stars, ELS or any other SLA systems. Property ownership and lodgement records remain secure and unaffected, it added. IBM has revoked access associated with the affected environment to prevent further unauthorised access, while SLA has identified the individuals whose information was contained in the dataset, and has begun notifying them and advising them on how to seek further information and assistance. Singapore mobilised over 100 cyber defenders to neutralise a sophisticated APT actor which infiltrated Singtel, StarHub, M1 and Simba networks in the country’s largest coordinated cyber incident response to date . 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. It has also lodged a police report and notified the Personal Data Protection Commission, and urged the public to remain vigilant against phishing emails, websites, text messages and phone calls from parties claiming to represent government agencies or other organisations. “We apologise for the concern and inconvenience this incident may cause,” the SLA said. The incident underscores the long-standing risk of real personal data finding its way into development and test environments , which are typically less closely guarded than production systems – a risk that is compounded when those environments are operated by third parties. It is also the latest in a series of supply chain security incidents in Singapore in recent years. In April 2025, Toppan Next Tech, a printing supplier for DBS Bank and the Singapore branch of Bank of China, was hit by a ransomware attack that saw customer data stolen by the threat actor . Some 8,200 DBS customers – mostly holders of DBS Vickers trading accounts and Cashline loans – and around 3,000 Bank of China customers were potentially affected. A year earlier, in August 2024, a hacker who gained unauthorised access to Mobile Guardian , a mobile device management platform then deployed across Singapore’s schools, remotely wiped the iPads and Chromebooks of about 13,000 students from 26 secondary schools. The Ministry of Education subsequently removed the software from all student devices and terminated its contract with the supplier.
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Latvijas Valsts Mezi (LVM) Suffers Cybersecurity Breach
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Axios npm package compromised in supply chain attack on July 23, 2026
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DoorDash Confirms Data Breach After Social Engineering Attack
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DyStar Group Hit by Settra Ransomware Attack, 1.3 TB of Internal Data Exfiltrated
Sponsored by Hudson Rock – Use Hudson Rock's free cybercrime intelligence tools to learn how Infostealer infections are leading to ransomware attacks This page displays the 100 most recent victim disclosures attributed to ransomware groups, as detected by Ransomware.live . Our platform continuously monitors and scrapes ransomware group leak sites to identify and list newly published victims. Recent Breaches › dystar.com Listed by settra Ransomware Group dystar.com Listed by settra Ransomware Group: What Was Exposed & What To Do Occurred June 2026 · publicly disclosed June 28, 2026. Dystar.com was listed by the Settra ransomware group on June 28, 2026, with internal files reported exfiltrated in the attack. An undisclosed number of people may be affected; check the listing and monitor your accounts for signs of compromise. The incident was reported on 28 June 2026. dystar.com appears on a listing attributed to the settra ransomware group. The group claims to hold 1.3 terabytes of data described as the complete digital archive of DyStar. No independent confirmation of the volume, the date of access, or the method of entry has been released. The number of people affected remains undisclosed. Settra is a ransomware operator that lists victim organisations on a public site after encrypting systems and copying files. The group’s listings function as a claim that data has been taken and may be released if demands are not met. No additional statements from settra specific to dystar.com have been verified beyond the listing itself. dystar.com belongs to an organisation that operates in the specialty chemicals sector, supplying dyes and related products to industrial clients. Entities of this type routinely maintain records on production processes, customer accounts, supplier arrangements and internal communications. A breach that exposes such material can affect both commercial operations and any personal details contained in those records. The only category named in available reports is internal files exfiltrated during a ransomware attack. The precise contents of the 1.3 terabytes referenced in the listing have not been itemised by the organisation or independently verified. Organisations in this sector commonly store employee records, contractual documents and operational data, yet the exact composition of the material in this case stays unconfirmed. Internal files can contain identifying information, financial references or communications that retain value long after the initial incident. Individuals named in those files may encounter follow-on risks such as targeted fraud or unwanted contact. For the organisation, the exposure of proprietary material can complicate business relationships and regulatory compliance even if the number of personal records remains unknown. Begin by monitoring accounts linked to any email address you have used with dystar.com or its partners. Enable multi-factor authentication on those accounts and review recent login activity. Request a copy of any personal data the organisation holds about you under applicable data-protection rules. Readers can run a free exposure scan of their email address against known breach data to check for appearances in public listings. Change passwords for any accounts that may share credentials with dystar.com systems. Watch bank and credit statements for unusual activity over the next several months. Contact dystar.com directly to ask what categories of personal information were held and whether they have been notified of the listing. Read GalaxyWarden’s full analysis of the dystar.com Listed by settra Ransomware Group → Publicly posted by settra — unverified claim, pending independent verification Breach listings — particularly those originating from ransomware or leak sites — are third-party claims that may be unverified, incomplete, or inaccurate. A listing does not by itself confirm that a breach occurred or that any specific data was exposed. Severity is an automated a
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