Yurei on DanSec Daily

Cybersecurity Brief – 2025-09-17

Wed, 17 Sep 2025 00:00:00 +0000

Major Incidents or Breaches

Jaguar Land Rover has extended its production shutdown for another week following a significant cyberattack that impacted systems at the end of August.
The US Department of Homeland Security exposed sensitive national security intelligence, including surveillance data on Americans, to thousands of unauthorized users due to a misconfigured data hub.
The RaccoonO365 phishing network, responsible for large-scale phishing campaigns, was dismantled following a joint operation by Microsoft and Cloudflare, resulting in the takedown of 338 malicious domains.
Google has removed 224 Android applications involved in the “SlopAds” ad fraud operation, which generated 2.3 billion ad requests daily and affected 38 million downloads globally.
At least 187 npm packages were compromised in a self-propagating supply chain attack, dubbed ‘Shai-Hulud’, which stole developer credentials and spread malware through infected packages.
The BreachForums hacking forum administrator, Conor Brian Fitzpatrick, was resentenced to three years in prison for cybercrime charges, including the operation of the forum and possession of CSAM.

Newly Discovered Vulnerabilities

Apple released security updates for iOS, macOS, and older iPhone/iPad models, addressing over 50 vulnerabilities, including CVE-2025-43300, an out-of-bounds flaw actively exploited in sophisticated spyware attacks.
Multiple critical vulnerabilities were disclosed in Chaos Mesh, a chaos engineering platform for Kubernetes, allowing for remote code execution and potential full cluster takeover.
A new Rowhammer attack, named Phoenix, was demonstrated against DDR5 memory, achieving root access on systems in under two minutes.
ChatGPT’s new calendar integration was shown to be exploitable for email exfiltration via crafted calendar invites.

Notable Threat Actor Activity

RevengeHotels, an established cybercrime group, has launched a new campaign in Latin America leveraging large language models (LLMs) to generate malicious scripts and using VenomRAT in targeted phishing attacks.
The North Korean group Kimsuky used ChatGPT to create deepfake military ID documents in attempts to compromise South Korean targets.
A new FileFix variant is delivering the StealC infostealer malware through multilingual phishing sites, using code obfuscation and steganography, and impersonating Meta account suspension warnings.
The Yurei ransomware group, believed to operate from Morocco, has claimed its first victims using a modified Prince-Ransomware binary.
The SlopAds fraud ring exploited commercial adtech infrastructure, including links to PropellerAds, to orchestrate its global ad fraud operation.
Security industry experts remain skeptical of claims by Scattered Spider and ShinyHunters that they are retiring, suggesting continued threat activity is likely.

Trends, Tools, or Tactics of Interest

Shadow AI threats are increasing, with reports highlighting the use of generative AI and autonomous agents in both attacks and enterprise workflows.
Phishing-as-a-service operations, such as RaccoonO365, continue to leverage large-scale domain infrastructure for credential theft.
Supply chain attacks targeting open-source repositories (npm) are increasingly employing self-replicating, worm-like malware to propagate and exfiltrate credentials.
AI chatbots, including ChatGPT and Grok, are being used to generate phishing emails and malicious code, with a noted focus on targeting vulnerable populations such as senior citizens.
Children and teenagers are increasingly involved in hacking school systems, often underestimating the consequences.
The FileFix campaign demonstrates advanced social engineering, using multilingual phishing, steganography, and code obfuscation.
The removal of WMIC (Windows Management Instrumentation Command-line) tool is planned for Windows 11 25H2 and later, impacting system administration and automation practices.
The emergence of new security solutions focused on AI agent management (Astrix), browser security (Neon Cyber), and real-time, AI-driven data protection (Ray Security) reflects a shift toward addressing AI-native and browser-based threats.

Regulatory or Policy Developments Affecting the Security Industry

CrowdStrike announced the acquisition of Pangea to launch AI Detection and Response (AIDR), expanding protection for enterprise AI models and applications.
Check Point is acquiring AI security firm Lakera, underlining growing industry demand for AI-native security solutions amid increased generative AI adoption.
Apple’s backporting of zero-day patches to older devices addresses ongoing exploitation concerns and highlights regulatory and customer pressure for extended device support.

Cybersecurity Brief – 2025-09-14

Sun, 14 Sep 2025 00:00:00 +0000

Major Incidents or Breaches

Apple has issued a fourth round of spyware attack notifications to users in France in 2025, confirmed by CERT-FR. These alerts relate to targeted campaigns using sophisticated spyware, with at least four notification waves sent this year.
The U.S. FBI has issued a flash alert regarding cybercriminal groups UNC6040 and UNC6395, which have conducted data theft attacks targeting Salesforce platforms. Indicators of compromise have been released to assist in detection and response.
A critical remote code execution vulnerability (CVE-2025-5086) in Dassault Systèmes DELMIA Apriso Manufacturing Operations Management software is being actively exploited. The vulnerability arises from deserialization of untrusted data, allowing attackers to achieve RCE. CISA has issued a warning regarding ongoing exploitation.
A payment system vendor, KioSoft, took over a year to patch a serious NFC card vulnerability that allowed infinite card top-ups, despite being notified in 2023. The patch has only recently been released.

Newly Discovered Vulnerabilities

Samsung has patched a critical zero-day vulnerability (CVE-2025-21043) affecting its Android devices, which was being actively exploited in the wild. The flaw enabled remote code execution and was initially reported via WhatsApp.
Researchers have identified a new ransomware strain, HybridPetya, which mimics Petya/NotPetya and exploits CVE-2024-7344 to bypass UEFI Secure Boot protections. The malware installs a malicious application on the EFI System Partition.
Academics have disclosed VMScape, a new variant of the Spectre attack that breaks cloud isolation by exploiting incomplete mitigations in the branch predictor state, enabling leakage of arbitrary memory between virtual machines.

Notable Threat Actor Activity

The ransomware group Yurei, first observed on 5 September 2025, has been identified as a new actor leveraging open-source ransomware. The group has begun listing victims on its leak site.
AI-powered phishing and social engineering attacks are being leveraged by threat actors to increase the success rate of ransomware campaigns, as highlighted in a report from Resilience.

Trends, Tools, or Tactics of Interest

AI-driven phishing campaigns are demonstrating higher success rates than traditional methods, fueling increased ransomware losses.
HybridPetya represents an evolution in ransomware tactics by targeting UEFI Secure Boot, indicating a shift toward lower-level system attacks.
Cloud-native security is increasingly focused on runtime visibility due to the widespread adoption of containers, Kubernetes, and serverless technologies.
Security researchers are combining tools like Burp Suite Professional with bug bounty platforms such as HackerOne to efficiently identify and report high-impact vulnerabilities.
The emergence of agentic and AI browsers is being discussed, with attention to their safety and implications for the future of web browsing.

Regulatory or Policy Developments Affecting the Security Industry

CISA has announced that the CVE Program will focus on enhancing the quality, trust, and responsiveness of vulnerability data.
Microsoft has reminded users that Windows 11 23H2 Home and Pro editions will reach end of support in 60 days, after which they will no longer receive security updates.
F5 has announced the acquisition of CalypsoAI for $180 million, aiming to integrate adaptive AI inference security solutions into its Application Delivery and Security Platform.

Cybersecurity Brief – 2025-09-13

Sat, 13 Sep 2025 00:00:00 +0000

Major Incidents or Breaches

Apple has sent a fourth round of spyware notifications to users in France in 2025, with CERT-FR confirming a targeted spyware campaign against Apple device users in the country.
Dassault Systèmes DELMIA Apriso Manufacturing Operations Management (MOM) software is being actively exploited via a critical remote code execution vulnerability (CVE-2025-5086), with multiple advisories and warnings from CISA.
A payment system vendor (KioSoft) reportedly took over a year to patch a critical NFC card vulnerability that enabled infinite card top-ups, despite being notified in 2023.
A new ransomware group called Yurei was identified, with initial victim data published.

Newly Discovered Vulnerabilities

Samsung has patched a critical zero-day vulnerability (CVE-2025-21043) in its Android devices, which was exploited in the wild, including attacks reported via WhatsApp.
A new ransomware strain, HybridPetya, has been discovered. It is a Petya/NotPetya copycat that can bypass UEFI Secure Boot protections by exploiting CVE-2024-7344.
Academics have disclosed VMScape, a new Spectre variant attack capable of breaking cloud isolation by leaking arbitrary memory through speculative execution flaws.
DELMIA Apriso MOM software is affected by CVE-2025-5086, a deserialization of untrusted data flaw allowing remote code execution, currently under active exploitation.
Undocumented radios have been found in solar-powered devices used in US highway infrastructure, raising concerns about unreported communications capabilities.

Notable Threat Actor Activity

A new ransomware group, Yurei, was discovered on 5 September, with evidence of at least one victim being targeted.
HybridPetya ransomware demonstrates advanced capabilities by bypassing UEFI Secure Boot and targeting the EFI System Partition, indicating continued adaptation of malware based on known destructive strains.

Trends, Tools, or Tactics of Interest

AI-powered phishing and social engineering attacks are reported to be significantly more successful than traditional methods, contributing to increased ransomware losses.
HybridPetya’s use of a UEFI Secure Boot bypass highlights a trend towards targeting firmware-level security mechanisms.
The security of cloud-native applications is being challenged by the proliferation of containers, Kubernetes, and serverless technologies, with an increased emphasis on runtime visibility.
Bug bounty hunters are combining tools like Burp Suite Professional and HackerOne to uncover high-impact vulnerabilities more efficiently.
Agentic and AI-powered browsers are emerging, raising questions about their security implications.

Regulatory or Policy Developments Affecting the Security Industry

CISA announced a renewed focus for the CVE Program on improving the quality, trust, and responsiveness of vulnerability data.
Microsoft reminded customers that Windows 11 23H2 Home and Pro editions will reach end of support in 60 days, after which they will stop receiving security updates.