Daily Security Briefing 007

September 12, 2025 | Read Online
Yurei ransomware rise, Microsoft Defender firewall flaws, Samsung fixes Android zero-day…

Executive Summary

Today’s cybersecurity news highlights the rapid emergence of the Yurei ransomware group exploiting open-source code to strike globally, signaling a continued trend of low-barrier ransomware threats. Microsoft has patched critical elevation-of-privilege vulnerabilities affecting its Windows Defender Firewall, alerting organizations to the importance of timely updates. Samsung’s Android security update addressed a high-severity zero-day exploited in the wild, underscoring mobile security risks. Meanwhile, sophisticated malware campaigns like EvilAI are leveraging AI deception to evade detection and steal data. Nation-state level threats persist, as Apple warns of spyware targeting French users and CISA alerts on active exploitation of a remote code execution flaw in Dassault software.

Top Articles

Meet Yurei: The New Ransomware Group Rising from Open-Source Code
The Yurei ransomware group surfaced on September 5 and quickly announced victims across Sri Lanka, India, and Nigeria. Built largely on the open-source Prince-Ransomware project, Yurei demonstrates how attackers with limited expertise can rapidly deploy active ransomware operations. Its emphasis is on data theft and public exposure rather than encryption-only extortion.
BleepingComputer

Microsoft Windows Defender Firewall Vulnerabilities Allow Privilege Escalation
Four serious elevation-of-privilege vulnerabilities in Windows Defender Firewall, disclosed on September 9, affect systems with local authenticated access. These flaws, tracked under CVE-2025-53808, CVE-2025-54104, CVE-2025-54109, and CVE-2025-54915, could let attackers escalate privileges to compromise system integrity. Microsoft has released advisories urging patching to mitigate these important risks.
GBHackers | CyberPress

Samsung Fixes Critical Zero-Day CVE-2025-21043 Exploited in Android Attacks
Samsung’s September security update fixes a critical zero-day (CVE-2025-21043) involving an out-of-bounds write allowing arbitrary code execution. This vulnerability has reportedly been exploited in active attacks against Android devices, emphasizing the necessity of applying updated firmware promptly.
TheHackerNews

HybridPetya Exploits UEFI Vulnerability to Bypass Secure Boot on Legacy Systems
Researchers uncovered HybridPetya, an advanced Petya/NotPetya variant capable of exploiting UEFI firmware vulnerabilities (CVE-2024-7344) to bypass Secure Boot protections on legacy hardware. This new ransomware underscores the threat posed by firmware-level exploits that evade traditional security controls.
GBHackers

EvilAI – Leveraging AI to Exfiltrate Browser Data and Evade Detection
A recent surge in trojans masquerading as legitimate AI or productivity software has been documented, named EvilAI. This malware series uses convincing interfaces and valid code-signing certificates to avoid detection while exfiltrating browser data globally, particularly targeting European corporate and individual users.
CyberPress

Apple Warns French Users of Fourth Spyware Campaign in 2025, CERT-FR Confirms
Apple has alerted French users to a fourth spyware campaign this year, confirmed by the country’s CERT-FR. Notifications were sent starting September 3 to devices linked to compromised iCloud accounts, highlighting persistent targeted spyware threats in Europe.
TheHackerNews

CISA warns of actively exploited Dassault RCE vulnerability
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) issued warnings of active exploitation targeting a critical remote code execution flaw in DELMIA Apriso, a manufacturing operations platform by Dassault Systèmes. This vulnerability presents significant risk to industrial environments and operational continuity.
BleepingComputer

A Cyberattack Victim Notification Framework
This analysis discusses challenges in promptly notifying victims after cyber incidents. Companies often struggle to identify true victims and rely on limited contact information, while victims may distrust notifications. The framework suggests improvements for clearer, timely, and trustworthy alerts to enable faster remediation.
Schneier on Security

The first three things you’ll want during a cyberattack
Acronis TRU emphasizes essentials for effective cyberattack response: clarity for situational awareness, control to contain threats, and a recovery lifeline to minimize damage. The guide targets MSPs and IT teams aiming to prepare for the immediacy and complexity of modern cyber incidents.
BleepingComputer

Assessing the Quality of Dried Squid
Researchers applied hyperspectral imaging combined with deep learning to nondestructively assess dried squid quality, a key product in marine food industries. This novel approach uses visible-near-infrared imaging for rapid, noninvasive inspection, demonstrating cybersecurity research’s cross-sector influence in sensor data analytics.
Schneier on Security

AI Transparency: This newsletter uses AI to curate, rank, and summarize cybersecurity content from leading industry blogs. All articles link directly to original authors. Executive summaries are AI-generated based on article content. I curate the sources and deliver the digest—the original authors deserve the credit for their excellent work.