An investigation has uncovered malicious Chromium-based browser extensions masquerading as legitimate AI assistant tools to collect Large Language Model (LLM) chat histories and browsing data. These extensions have been installed approximately 900,000 times, affecting over 20,000 enterprise tenants. The malicious extensions collect full URLs and AI chat content from platforms like ChatGPT and DeepSeek, potentially exposing organizations to leaks of confidential information. The attack chain involves reconnaissance, weaponization, delivery through trusted app stores, exploitation of user trust, installation for persistence, and regular data exfiltration to attacker-controlled infrastructure. This activity transforms a seemingly benign productivity tool into a persistent data collection mechanism embedded in daily enterprise browser usage.
Less than half of the total zero-days have been attributed to a threat actor, but spyware vendors and China are in the lead. The post Google: Half of 2025’s 90 Exploited Zero-Days Aimed at Enterprises appeared first on SecurityWeek .
Evgenii Ptitsyn was extradited to the United States from South Korea in November 2024. The post Russian Ransomware Operator Pleads Guilty in US appeared first on SecurityWeek .
A sophisticated cyber attack campaign combines social engineering and advanced malware techniques. Attackers pose as IT support to gain initial access, then deploy a modified version of the Havoc C2 framework. The malware uses DLL sideloading, indirect syscalls, and custom loaders to evade detection. After compromising the initial system, the attackers rapidly move laterally, establishing persistence through scheduled tasks and legitimate remote monitoring tools. The campaign demonstrates a blend of human-centric initial access methods and advanced technical evasion techniques, highlighting the need for comprehensive security measures spanning user awareness and technical controls.
The stolen credential marketplace had been active since 2021 and in late 2025 it counted 142,000 users. The post LeakBase Cybercrime Forum Shut Down, Suspects Arrested appeared first on SecurityWeek .
Google and iVerify analysis reveals a powerful exploit kit originally used by Russian state actors that is now appearing in broader criminal campaigns. The post Nation-State iOS Exploit Kit ‘Coruna’ Found Powering Global Attacks appeared first on SecurityWeek .
Tycoon2FA emerged as a prominent phishing-as-a-service platform in August 2023, enabling large-scale campaigns targeting over 500,000 organizations monthly. Developed by Storm-1747, it provided adversary-in-the-middle capabilities to bypass multifactor authentication. The kit allowed impersonation of trusted brands like Microsoft 365 and Gmail, intercepting session cookies and credentials. It employed sophisticated evasion techniques including anti-bot screening, browser fingerprinting, and custom CAPTCHAs. Tycoon2FA's infrastructure evolved to use diverse, short-lived domains and complex redirect chains. Its success stemmed from closely mimicking legitimate authentication processes while covertly intercepting user credentials and session tokens.
The analysis examines Iranian state-aligned threat actors and their infrastructure patterns during heightened geopolitical tensions. It focuses on mapping network infrastructure, ASN patterns, TLS fingerprints, and hosting clusters associated with various Iranian APT groups. The report highlights the importance of proactive infrastructure monitoring to detect and disrupt potential cyber operations. Key findings include the identification of previously unreported hosts, domains, and servers linked to Iranian operations, as well as insights into the tactics used by groups like MuddyWater and Dark Scepter. The article emphasizes the value of infrastructure intelligence in early threat detection and provides recommendations for organizations to monitor and defend against these threats.
Researchers at Infoblox have developed an advanced technique leveraging graph theory and SSL certificates to uncover threat actor operational relationships. The approach analyzes Certificate Transparency logs, using the Subject Alternative Name field in certificates to identify domains under common control. By modeling domains as nodes and certificate relationships as edges, the system reveals comprehensive threat infrastructures. This method enables discovery of new malicious domains, consolidation of threat actor identities, and early detection of emerging threats. The system processes millions of certificates daily, providing actionable intelligence on threat actor operations across various types of cybercriminal activities.
The phishing-as-a-service platform was used to send fraudulent emails to over 500,000 organizations every month. The post Tycoon 2FA Phishing Platform Dismantled in Global Takedown appeared first on SecurityWeek .
The hackers claim to have stolen 2GB of files, including 400,000 personal information records. The post New LexisNexis Data Breach Confirmed After Hackers Leak Files appeared first on SecurityWeek .
Explaining how the browser-in-the-browser phishing technique works, why fake login windows look just like the real thing, and the red flags that can help you identify a scam page.
Employees seeking free versions of paid software may unknowingly install malware-laced “cracked” apps that can steal credentials, deploy cryptominers, or open the door to ransomware. The post How Pirated Software Turns Helpful Employees Into Malware Delivery Agents appeared first on SecurityWeek .
The attackers are sending out fake alerts claiming unauthorized access or master password changes. The post LastPass Warns of New Phishing Campaign appeared first on SecurityWeek .
Starting September 2026, new Chrome iterations will be released twice as fast, part of a two-week cycle. The post Google Plans Two-Week Release Schedule for Chrome appeared first on SecurityWeek .
