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Category — browser security
Lazarus Group Deploys Marstech1 JavaScript Implant in Targeted Developer Attacks

Lazarus Group Deploys Marstech1 JavaScript Implant in Targeted Developer Attacks

Feb 14, 2025 Browser Security / Cryptocurrency
The North Korean threat actor known as the Lazarus Group has been linked to a previously undocumented JavaScript implant named Marstech1 as part of limited targeted attacks against developers. The active operation has been dubbed Marstech Mayhem by SecurityScorecard, with the malware delivered by means of an open-source repository hosted on GitHub that's associated with a profile named "SuccessFriend." The profile, active since July 2024, is no longer accessible on the code hosting platform. The implant is designed to collect system information, and can be embedded within websites and NPM packages, posing a supply chain risk. Evidence shows that the malware first emerged in late December 2024. The attack has amassed 233 confirmed victims across the U.S., Europe, and Asia. "The profile mentioned web dev skills and learning blockchain which is in alignment to the interests of Lazarus," SecurityScorecard said . "The threat actor was committing both pre-o...
New SLAP & FLOP Attacks Expose Apple M-Series Chips to Speculative Execution Exploits

New SLAP & FLOP Attacks Expose Apple M-Series Chips to Speculative Execution Exploits

Jan 29, 2025 Vulnerability / Threat Intelligence
A team of security researchers from Georgia Institute of Technology and Ruhr University Bochum has demonstrated two new side-channel attacks targeting Apple silicon that could be exploited to leak sensitive information from web browsers like Safari and Google Chrome. The attacks have been codenamed Data Speculation Attacks via Load Address Prediction on Apple Silicon ( SLAP ) and Breaking the Apple M3 CPU via False Load Output Predictions ( FLOP ). Apple was notified of the issues in May and September 2024, respectively. The vulnerabilities, like the previously disclosed iLeakage attack, build on Spectre , arising when speculative execution "backfires," leaving traces of mispredictions in the CPU's microarchitectural state and the cache. Speculative execution refers to a performance optimization mechanism in modern processors that are aimed at predicting the control flow the CPU should take and execute instructions along the branch beforehand. In the event of a mi...
Protecting Your Software Supply Chain: Assessing the Risks Before Deployment

Protecting Your Software Supply Chain: Assessing the Risks Before Deployment

Feb 11, 2025Software Security / Threat Intelligence
Imagine you're considering a new car for your family. Before making a purchase, you evaluate its safety ratings, fuel efficiency, and reliability. You might even take it for a test drive to ensure it meets your needs. The same approach should be applied to software and hardware products before integrating them into an organization's environment. Just as you wouldn't buy a car without knowing its safety features, you shouldn't deploy software without understanding the risks it introduces. The Rising Threat of Supply Chain Attacks Cybercriminals have recognized that instead of attacking an organization head-on, they can infiltrate through the software supply chain—like slipping counterfeit parts into an assembly line. According to the 2024 Sonatype State of the Software Supply Chain report , attackers are infiltrating open-source ecosystems at an alarming rate, with over 512,847 malicious packages detected last year alone—a 156% increase from the previous year. Traditional sec...
New "DoubleClickjacking" Exploit Bypasses Clickjacking Protections on Major Websites

New "DoubleClickjacking" Exploit Bypasses Clickjacking Protections on Major Websites

Jan 01, 2025 Web Security / Vulnerability
Threat hunters have disclosed a new "widespread timing-based vulnerability class" that leverages a double-click sequence to facilitate clickjacking attacks and account takeovers in almost all major websites. The technique has been codenamed DoubleClickjacking by security researcher Paulos Yibelo. "Instead of relying on a single click, it takes advantage of a double-click sequence," Yibelo said . "While it might sound like a small change, it opens the door to new UI manipulation attacks that bypass all known clickjacking protections, including the X-Frame-Options header or a SameSite: Lax/Strict cookie." Clickjacking , also called UI redressing, refers to an attack technique in which users are tricked into clicking on a seemingly innocuous web page element (e.g., a button), leading to the deployment of malware or exfiltration of sensitive data. DoubleClickjacking is a variation of this theme that exploits the gap between the start of a click and the...
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When Good Extensions Go Bad: Takeaways from the Campaign Targeting Browser Extensions

When Good Extensions Go Bad: Takeaways from the Campaign Targeting Browser Extensions

Dec 30, 2025 Browser Security / GenAI Security
News has been making headlines over the weekend of the extensive attack campaign targeting browser extensions and injecting them with malicious code to steal user credentials. Currently, over 25 extensions, with an install base of over two million users, have been found to be compromised, and customers are now working to figure out their exposure (LayerX, one of the companies involved in protecting against malicious extensions is offering a complimentary service to audit and remediate organizations' exposure - to sign-up click here ). While this is not the first attack to target browser extensions, the scope and sophistication of this campaign are a significant step up in terms of the threats posed by browser extensions and the risks they pose to organizations. Now that details of the attack have been publicized, users and organizations need to assess their risk exposure to this attack and to browser extensions in general. This article is aimed at helping organizations understand t...
Dozens of Chrome Extensions Hacked, Exposing Millions of Users to Data Theft

Dozens of Chrome Extensions Hacked, Exposing Millions of Users to Data Theft

Dec 29, 2025 Endpoint Protection / Browser Security
A new attack campaign has targeted known Chrome browser extensions, leading to at least 35 extensions being compromised and exposing over 2.6 million users to data exposure and credential theft. The attack targeted publishers of browser extensions on the Chrome Web Store via a phishing campaign and used their access permissions to insert malicious code into legitimate extensions in order to steal cookies and user access tokens. The first company to shed light the campaign was cybersecurity firm Cyberhaven, one of whose employees was targeted by a phishing attack on December 24, allowing the threat actors to publish a malicious version of the extension. On December 27, Cyberhaven disclosed that a threat actor compromised its browser extension and injected malicious code to communicate with an external command-and-control (C&C) server located on the domain cyberhavenext[.]pro, download additional configuration files, and exfiltrate user data. The phishing email, which purported...
Comprehensive Guide to Building a Strong Browser Security Program

Comprehensive Guide to Building a Strong Browser Security Program

Nov 13, 2024 Browser Security / SaaS Security
The rise of SaaS and cloud-based work environments has fundamentally altered the cyber risk landscape. With more than 90% of organizational network traffic flowing through browsers and web applications, companies are facing new and serious cybersecurity threats. These include phishing attacks, data leakage, and malicious extensions. As a result, the browser also becomes a vulnerability that needs to be protected. LayerX has released a comprehensive guide titled "Kickstarting Your Browser Security Program" This in-depth guide serves as a roadmap for CISOs and security teams looking to secure browser activities within their organization; including step-by-step instructions, frameworks, and use cases. Below, we bring its main highlights. Prioritizing Browser Security Browsers now serve as the primary interface for SaaS applications, creating new malicious opportunities for cyber adversaries. The risks include: Data leakage - Browsers can expose sensitive data by allowing empl...
Enterprise Identity Threat Report 2024: Unveiling Hidden Threats to Corporate Identities

Enterprise Identity Threat Report 2024: Unveiling Hidden Threats to Corporate Identities

Oct 31, 2024 Identity Security / Browser Security
In the modern, browser-centric workplace, the corporate identity acts as the frontline defense for organizations. Often referred to as "the new perimeter", the identity stands between safe data management and potential breaches. However, a new report reveals how enterprises are often unaware of how their identities are being used across various platforms. This leaves them vulnerable to data breaches, account takeovers, and credential theft. The "Enterprise Identity Threat Report 2024" ( download here ) is based on exclusive data available only to the LayerX Browser Security platform. This data derives from LayerX's unique visibility into every user action in the browser, across industries. It provides a detailed analysis of emerging risks and uncovered hidden threats. To register to a live webinar to cover the key findings in this report, Click here . Below is a deeper dive into some of the report's most critical findings: 1. The Greatest Risk Comes from 2% of Users Security profe...
Opera Browser Fixes Big Security Hole That Could Have Exposed Your Information

Opera Browser Fixes Big Security Hole That Could Have Exposed Your Information

Oct 30, 2024 Browser Security / Vulnerability
A now-patched security flaw in the Opera web browser could have enabled a malicious extension to gain unauthorized, full access to private APIs. The attack, codenamed CrossBarking , could have made it possible to conduct actions such as capturing screenshots, modifying browser settings, and account hijacking, Guardio Labs said. To demonstrate the issue, the company said it managed to publish a seemingly harmless browser extension to the Chrome Web Store that could then exploit the flaw when installed on Opera, making it an instance of a cross-browser-store attack. "This case study not only highlights the perennial clash between productivity and security but also provides a fascinating glimpse into the tactics used by modern threat actors operating just below the radar," Nati Tal, head of Guardio Labs, said in a report shared with The Hacker News. The issue has been addressed by Opera as of September 24, 2024, following responsible disclosure. That said, this is not th...
Microsoft Reveals macOS Vulnerability that Bypasses Privacy Controls in Safari Browser

Microsoft Reveals macOS Vulnerability that Bypasses Privacy Controls in Safari Browser

Oct 18, 2024 Threat Intelligence / Browser Security
Microsoft has disclosed details about a now-patched security flaw in Apple's Transparency, Consent, and Control (TCC) framework in macOS that has likely come under exploitation to get around a user's privacy preferences and access data. The shortcoming, codenamed HM Surf by the tech giant, is tracked as CVE-2024-44133 (CVSS score: 5.5). It was addressed by Apple as part of macOS Sequoia 15 by removing the vulnerable code. HM Surf "involves removing the TCC protection for the Safari browser directory and modifying a configuration file in the said directory to gain access to the user's data, including browsed pages, the device's camera, microphone, and location, without the user's consent," Jonathan Bar Or of the Microsoft Threat Intelligence team said . Microsoft said the new protections are limited to Apple's Safari browser, and that it's working with other major browser vendors to further explore the benefits of hardening local configuration file...
Cybercriminals Use Unicode to Hide Mongolian Skimmer in E-Commerce Platforms

Cybercriminals Use Unicode to Hide Mongolian Skimmer in E-Commerce Platforms

Oct 10, 2024 Cybercrime / Malware
Cybersecurity researchers have shed light on a new digital skimmer campaign that leverages Unicode obfuscation techniques to conceal a skimmer dubbed Mongolian Skimmer. "At first glance, the thing that stood out was the script's obfuscation, which seemed a bit bizarre because of all the accented characters," Jscrambler researchers said in an analysis. "The heavy use of Unicode characters, many of them invisible, does make the code very hard to read for humans." The script, at its core, has been found to leverage JavaScript's capability to use any Unicode character in identifiers to hide the malicious functionality. The end goal of the malware is to steal sensitive data entered on e-commerce checkout or admin pages, including financial information, which are then exfiltrated to an attacker-controlled server. The skimmer, which typically manifests in the form of an inline script on compromised sites that fetches the actual payload from an external serv...
Firefox Zero-Day Under Attack: Update Your Browser Immediately

Firefox Zero-Day Under Attack: Update Your Browser Immediately

Oct 10, 2024 Vulnerability / Browser Security
Mozilla has revealed that a critical security flaw impacting Firefox and Firefox Extended Support Release (ESR) has come under active exploitation in the wild. The vulnerability, tracked as CVE-2024-9680 (CVSS score: 9.8), has been described as a use-after-free bug in the Animation timeline component. "An attacker was able to achieve code execution in the content process by exploiting a use-after-free in Animation timelines," Mozilla said in a Wednesday advisory.  "We have had reports of this vulnerability being exploited in the wild." Security researcher Damien Schaeffer from Slovakian company ESET has been credited with discovering and reporting the vulnerability. The issue has been addressed in the following versions of the web browser -  Firefox 131.0.2 Firefox ESR 128.3.1, and Firefox ESR 115.16.1. There are currently no details on how the vulnerability is being exploited in real-world attacks and the identity of the threat actors behind them. T...
Session Hijacking 2.0 — The Latest Way That Attackers are Bypassing MFA

Session Hijacking 2.0 — The Latest Way That Attackers are Bypassing MFA

Sep 30, 2024 Identity Theft / Phishing Attack
Attackers are increasingly turning to session hijacking to get around widespread MFA adoption. The data supports this , as: 147,000 token replay attacks were detected by Microsoft in 2023, a 111% increase year-over-year (Microsoft).  Attacks on session cookies now happen in the same order of magnitude as password-based attacks (Google). But session hijacking isn't a new technique – so what's changed? Session hijacking has a new look When we think of the classic example of session hijacking, we think of old-school Man-in-the-Middle (MitM) attacks that involved snooping on unsecured local network traffic to capture credentials or, more commonly, financial details like credit card data. Or, by conducting client-side attacks compromising a webpage, running malicious JavaScript and using cross-site scripting (XSS) to steal the victim's session ID.  Session hijacking looks quite different these days. No longer network-based, modern session hijacking is an identity-based att...
Expert Tips on How to Spot a Phishing Link

Expert Tips on How to Spot a Phishing Link

Sep 25, 2024 Cyber Awareness / Threat Detection
Phishing attacks are becoming more advanced and harder to detect, but there are still telltale signs that can help you spot them before it's too late. See these key indicators that security experts use to identify phishing links: 1. Check Suspicious URLs  Phishing URLs are often long, confusing, or filled with random characters. Attackers use these to disguise the link's true destination and mislead users.  The first step in protecting yourself is to inspect the URL carefully. Always ensure it begins with "HTTPS," as the "s" indicates a secure connection using an SSL certificate.  However, keep in mind that SSL certificates alone are not enough. Cyber attackers have increasingly used legitimate-looking HTTPS links to distribute malicious content. This is why you should be suspicious of links that are overly complex or look like a jumble of characters.  Tools like ANY.RUN's Safebrowsing allow users to check suspicious links in a secure and isolated environment ...
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