Browser Security Archives

Tech Optimizer

August 31, 2026

Fake Chrome update scam could infect your computer

A fake Chrome update scam has emerged, linked to a Chrome extension called Enable Right Click & Copy - Smart Unlock + OCR, which was initially legitimate but later compromised. The extension had around 70,000 users before being removed from the Chrome Web Store on August 14 due to its malicious nature. Users may encounter deceptive warnings while browsing benign sites, urging them to download files instead of using Chrome's built-in update mechanism. Google advises against engaging with suspicious pop-ups requesting software installations. The scam highlights that trusted extensions can become threats without warning, and users should regularly review their installed extensions and check for updates directly within Chrome. Similar fake update alerts have also been reported in other Chromium-based browsers. Users are encouraged to adopt safety measures, such as using strong antivirus software, reviewing browser extensions, and being cautious with downloaded files. If a suspicious file has been executed, users should treat their computer as potentially compromised and take appropriate security actions.

Tech Optimizer

July 4, 2026

How to Use a Virus Checker on Your PC (2026)

Windows includes a built-in virus checker called Microsoft Defender Antivirus, which allows users to conduct virus scans. 1. To initiate a scan, open Windows Security, navigate to Virus & threat protection, and select Quick scan for a fast check. 2. Users can check which antivirus is active by going to Who's protecting me? in Windows Security. If a non-Microsoft antivirus is installed, Microsoft Defender will disable itself. 3. Before scanning, it's important to update the security intelligence by checking for updates in Protection updates. 4. A full scan can be executed by selecting Full scan in Scan options, while a custom scan allows users to specify a location to check. 5. For stubborn malware, Microsoft Defender Offline can be used, which requires a restart of Windows. 6. Scan results and quarantined threats can be reviewed in Protection history after any scan. 7. For additional checks, users can utilize VirusTotal for individual files or links, Microsoft Safety Scanner for a one-time scan, or the Malicious Software Removal Tool for specific malware. 8. Outdated tools like the Chrome Cleanup Tool and Norton Power Eraser should be disregarded as they are no longer effective. Users can scan individual files without scanning the entire PC, and results from the Microsoft Defender Offline scan are found in Protection history. The Microsoft Safety Scanner does not replace real-time antivirus protection, and managed devices can be scanned by IT administrators.

Tech Optimizer

May 26, 2026

Best Free Antivirus for Windows 10 in 2026: Top Free Protection Options

In 2026, the landscape of free antivirus tools for Windows 10 includes several options: 1. Bitdefender Antivirus Free - Offers robust protection with real-time malware detection and operates in the background. 2. Avast One (Free Antivirus) - A feature-rich option with tools for browser security and network protection. 3. TotalAV Free Antivirus - Focuses on scanning and cleanup, ideal for users who prefer on-demand scans. 4. AVG AntiVirus Free - Provides reliable everyday protection with a user-friendly interface. 5. Avira Free Security - A comprehensive package that includes multiple security tools. 6. Malwarebytes Free - Serves as a secondary scanner to catch threats that others may overlook. 7. Microsoft Defender Antivirus - Built into Windows, offering essential protection without additional installation. Key features to consider in free antivirus software include real-time malware detection, phishing defense, ransomware protection, automatic updates and scans, and a user-friendly interface. Free antivirus tools often lack advanced features found in paid versions, such as comprehensive VPN services, advanced firewall options, identity theft protection, and priority customer support. Drawbacks of free antivirus software include limited features compared to paid versions, potential intrusive advertisements, and less comprehensive customer support. Specific recommendations based on user needs include: - Bitdefender Antivirus Free for minimal interference. - Avast One for extensive features. - TotalAV Free Antivirus for users focused on system cleanup.

Winsage

May 16, 2026

Windows 11 and Microsoft Edge Hacked at Pwn2Own Berlin 2026

On May 14, Pwn2Own Berlin 2026 began, where researchers earned ,000 for 24 unique zero-day vulnerabilities. Cheng-Da Tsai, also known as Orange Tsai, achieved a significant Edge sandbox escape, earning ,000, and later exploited Microsoft Exchange for remote code execution, earning an additional ,000. Tsai accumulated 17.5 Master of Pwn points, contributing to DEVCORE's lead with ,000 in total earnings. Other researchers, including Angelboy and TwinkleStar03, earned ,000 for an Improper Access Control vulnerability, while Marcin Wiązowski and Kentaro Kawane also contributed successful exploits. By the end of Day One, DEVCORE led with ,000, and the event featured a prize pool exceeding ,000,000 across 31 targets. As of Day Two, a total of ,750 had been awarded for 39 unique vulnerabilities, with DEVCORE leading at 40.5 points and ,000 in earnings.

Tech Optimizer

April 27, 2026

Bitdefender Total Security review: Tried and tested by an antivirus expert

Modern antivirus solutions have integrated various tools into a single interface, with Bitdefender exemplifying this trend. It features a dashboard for system scans, recommendations, and account management. The “Protection” section includes antivirus settings, online threat defense, and firewall options. Users can enable an anti-spam service for email applications like Outlook and Thunderbird. The privacy tab offers an anti-tracker browser plugin and a limited free VPN. Additional privacy features include video and audio protection to manage webcam and microphone access, and Safepay for secure online banking. Bitdefender also provides a desktop widget for protection status, secure file shredding, and remote device management options. In terms of performance, Bitdefender operates efficiently, using less than 100MB of RAM for its main interface, but can spike during full system scans. It successfully detected a trojan during a scan of a linked Google Drive account. Bitdefender effectively identified all test files in antivirus testing and enhances browser security by intervening when users ignore warnings. The application is easy to install, with a compact file size, and offers a Quick Scan feature that allows users to scan only applications after a thorough initial scan.

Tech Optimizer

April 22, 2026

Best Android Antivirus Apps for 2026 With Powerful Malware Defense, Anti‑Theft Features, and Privacy Protection

In 2026, Android users face increasing threats from sophisticated malware, theft tactics, and tracking, making antivirus apps essential for daily security. Android remains a prime target for cybercriminals, with built-in protections insufficient against risks from dubious apps, malicious websites, and unsecured Wi-Fi networks. Antivirus apps enhance security through real-time malware scanning, safer browsing, and device management features. Norton 360 for Android offers strong malware detection and privacy tools, including real-time scans and web protection. Bitdefender Mobile Security provides high malware detection rates with minimal device performance impact, featuring cloud-based scanning and a built-in VPN. Avast Mobile Security is a popular free option with anti-theft capabilities, while Avira Security focuses on privacy protection with a lightweight design. McAfee Mobile Security supports multi-device security and includes identity-monitoring features. Kaspersky and other antivirus options emphasize malware detection, web protection, and anti-theft tools. Choosing the right antivirus app depends on individual priorities, such as malware protection, anti-theft controls, or privacy features. Users should consider factors like price, device count, and performance when selecting an app.

Winsage

March 2, 2026

RAT Malware Via Windows Explorer Puts Crypto at Risk

Cofense Intelligence reported that threat actors are exploiting Windows File Explorer and WebDAV servers to deliver Remote Access Trojans (RATs) to corporate systems, bypassing browser security measures. This method allows attackers to infiltrate machines without using web browsers, taking advantage of File Explorer's ability to connect to remote WebDAV servers. Despite WebDAV being deprecated by Microsoft in November 2023, it is still supported in Windows, creating a vulnerability. The campaigns began in February 2024, with a significant increase in September 2024, and 87% of these campaigns deliver multiple RATs, including XWorm, Async RAT, and DcRAT. Victims typically receive phishing emails disguised as invoices, containing URL or LNK shortcut files that initiate a WebDAV connection. The attacks often utilize Cloudflare Tunnel for hosting malicious WebDAV servers, making the traffic appear legitimate. Notably, 50% of affected campaigns are in German, while 30% are in English. The report emphasizes the risks posed to individuals holding digital assets, as RATs can access sensitive information, including crypto wallet files. Organizations are advised to monitor network traffic for Cloudflare Tunnel instances and educate users about the risks associated with File Explorer's capabilities.

Winsage

March 1, 2026

Hackers Abuse Windows File Explorer and WebDAV for Stealthy Malware Delivery

Cybercriminals are exploiting a legacy feature in Windows File Explorer, specifically the WebDAV protocol, to distribute malware and bypass traditional security measures. Despite Microsoft deprecating native WebDAV support in November 2023, it remains active on many systems. Attackers use WebDAV to deceive victims into executing malicious payloads by sending links that connect File Explorer directly to remote servers, avoiding web browsers and their security warnings. They employ methods such as direct linking, URL shortcut files, and LNK shortcut files to deliver exploits. The primary objective of these campaigns, which surged in late 2024, is to deploy Remote Access Trojans (RATs), with 87% of Active Threat Reports involving multiple RATs like XWorm RAT, Async RAT, and DcRAT. These campaigns predominantly target corporate networks in Europe, with many phishing emails written in German and English. Attackers use short-lived WebDAV servers hosted on Cloudflare Tunnel demo accounts to obscure their infrastructure. Security analysts are advised to monitor unusual network activity from Windows Explorer and educate users to verify addresses in File Explorer.

Tech Optimizer

December 7, 2025

FTC sends $15.3 million in refunds to Avast antivirus customers

The Federal Trade Commission (FTC) is distributing million to 103,152 consumers affected by misleading marketing practices related to Avast's antivirus software. This distribution began on December 2, 2025, as part of a settlement finalized in June 2024, which addressed allegations that Avast collected, stored, and sold users' browsing information without proper notice or consent. Consumers can receive payments via checks, PayPal, or Zelle, with specific timeframes for cashing or redeeming funds. Rust Consulting, Inc. is the refund administrator, and individuals are advised not to pay any fees or provide account information to file claims. The settlement also imposes restrictions on Avast, including a permanent ban on selling web browsing data for advertising and a requirement to obtain clear consent from users for any future data sales.

Winsage

September 8, 2025

MostereRAT Targets Windows Users With Stealth Tactics

A recent investigation by cybersecurity experts revealed a sophisticated phishing campaign utilizing a new strain of malware called MostereRAT, which targets Microsoft Windows systems. This Remote Access Trojan (RAT) allows attackers extensive control over compromised devices and employs advanced evasion techniques, including being crafted in the Easy Programming Language (EPL). MostereRAT can disable security tools, obstruct antivirus traffic, and establish secure communications with its command-and-control server through mutual TLS (mTLS). The attack begins with phishing emails aimed at Japanese users, leading to the download of a Word document that contains a concealed archive. This prompts the user to execute an embedded executable, activating the malware, which installs itself in the system directory and creates services with SYSTEM-level privileges. It also displays a deceptive message in Simplified Chinese to further spread the malware. MostereRAT can disable Windows Update, terminate antivirus processes, and impersonate the TrustedInstaller account to escalate privileges. Its functionalities include keylogging, system information collection, downloading and executing payloads, creating hidden administrator accounts, and running remote access tools like AnyDesk and TightVNC. Some components of MostereRAT's infrastructure were previously linked to a banking trojan reported in 2020.