DigiCert Security Incident Linked to GoldenEyeDog Subgroup CylindricalCanine
DigiCert's security incident in April 2026 has been attributed to CylindricalCanine, a subgroup of the China-linked cybercrime group GoldenEyeDog (also known as APT-Q-27, Dragon Breath, and Miuuti Group).
Key points
- DigiCert's April 2026 security incident attributed to CylindricalCanine, a subgroup of GoldenEyeDog.
- Attackers compromised a support employee's device via a phishing lure in a support ticket.
- Initialization codes for code-signing certificates were stolen.
Connected intelligence
Signal brief
Follow the organization, likely method and potential impact to explore connected Shadow Tier intelligence.
Organization
- Published
- Jul 23, 2026
- Updated
- Jul 25, 2026
- Confidence
- High
- Evidence
- 10 sources
Structured assessment
Signal analysis
It helps compare this signal with other published signals without treating the labels as final determinations.
Threat source
Watch phishing, executive impersonation and account-takeover exposure.
- Source type: possible insider or internal misuse
- Actor profile: Nation State Or Named Threat Actor
Business impact
- Impact area
- Unknown
Mentioned entities
Quick context
Questions about this signal
What happened in this signal?
DigiCert's security incident in April 2026 has been attributed to CylindricalCanine, a subgroup of the China-linked cybercrime group GoldenEyeDog (also known as APT-Q-27, Dragon Breath, and Miuuti Group). The attackers compromised a support employee's device using malware delivered via a phishing lure disguised as a screenshot or document sent through DigiCert's support-ticket workflow. This intrusion granted the threat actors access to initialization codes for customers renewing code-signing certificates. By intercepting these codes, the attackers were able to obtain 27 fraudulent code-signing certificates, which were then used to sign malware, including the "Zong Stealer" campaign. DigiCert identified the incident through third-party reports of certificates being used in malware and subsequently revoked 60 certificates by April 17, with 27 explicitly linked to the attackers. The company emphasized that its root certificates were never compromised, and the breach was limited to a finite set of certificates. DigiCert has since blocked high-risk file types at ingestion, removed malicious files from Salesforce cases and chat records, and is working on sandboxing controls for inbound support attachments.
When was this signal reported?
Shadow Tier lists Jul 23, 2026 as the signal date.
Which organization is connected to this signal?
Digicert is the organization connected to this public signal.
Explore DigicertWhich attack pattern is relevant?
This signal is connected to phishing and social-engineering intelligence based on its reported incident context.
Explore phishing and social-engineering intelligenceRelated signals
Compare shared topics, actors and incident patterns before opening the full signal.
Axios npm package compromised in supply chain attack on July 23, 2026
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Singapore Land Authority Data Breach Exposes 70,000 Records via IBM Testing Environment
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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. 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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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Healthcare AI Company Xsolis Suffers Data Breach Impacting 1.4 Million Individuals
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