Microsoft Defender Antivirus Archives

Tech Optimizer

January 13, 2026

Trusted Antivirus Protection for PCs

Your PC requires robust antivirus protection due to its diverse usage, and Windows 11 offers built-in protections that operate seamlessly. Antivirus software, such as Microsoft Defender in Windows 11, protects against threats like viruses, malware, phishing websites, and suspicious email attachments. However, it cannot fully defend against social engineering scams, new ransomware, zero-day vulnerabilities, or risky online behaviors. Microsoft Defender provides automatic threat scanning, works with the Windows firewall, utilizes cloud intelligence, alerts users to unsafe content, and offers ransomware protection. To enhance security, users should keep software updated, use strong passwords, secure their Wi-Fi, enable firewalls, and back up files regularly.

Winsage

January 9, 2026

Is turning off Windows Security a bad idea in 2026? A PC expert’s bottom line

Windows Security is a comprehensive security suite for Windows users that monitors downloads, blocks threats, and quarantines malware. Users may need to disable it temporarily to install third-party software or games that are mistakenly flagged as threats. Permanent deactivation is typically for advanced users who may replace it with another security suite, but it increases vulnerability to online threats. To temporarily disable Windows Security, users can toggle off Real-time protection in the Windows Security app. For permanent deactivation, Windows 11 Pro users can use the Local Group Policy Editor, while Home users must edit the Registry. Creating a restore point before making changes is recommended for safety. Disabling Windows Security, even temporarily, should be done with caution to avoid increased risk of infections.

Tech Optimizer

December 11, 2025

Hackers Are Targeting Windows 10 Users. Make Sure to Do This One Thing to Stay Safe

Microsoft has set the end of support for Windows 10 to October 14, 2025, after which users will not receive security updates or technical assistance. Windows 10 machines will continue to function, but users will face risks due to unaddressed security vulnerabilities. Microsoft has introduced the Extended Security Updates (ESU) program, extending support for eligible consumer editions until October 13, 2026, with specific enrollment criteria. Windows 11 installations surpassed Windows 10 in June 2025, with Windows 11 holding a 53.7% market share compared to Windows 10's 42.7%. Users can continue using Windows 10 by employing third-party security solutions, including antivirus programs and VPNs, to mitigate risks in the absence of Microsoft’s support.

Winsage

November 25, 2025

JackFix Uses Fake Windows Update Pop-Ups on Adult Sites to Deliver Multiple Stealers

Cybersecurity experts have identified a new campaign that combines ClickFix tactics with counterfeit adult websites to trick users into executing harmful commands under the guise of a "critical" Windows security update. This campaign uses fake adult sites, including clones of popular platforms, as phishing mechanisms, increasing psychological pressure on victims. ClickFix-style attacks have risen significantly, accounting for 47% of all attacks, according to Microsoft data. The campaign features convincing fake Windows update screens that take over the user's screen and instruct them to execute commands that initiate malware infections. The attack begins when users are redirected to a fake adult site, where they encounter an "urgent security update." The counterfeit Windows Update screen is created using HTML and JavaScript, and it attempts to prevent users from escaping the alert. The initial command executed is an MSHTA payload that retrieves a PowerShell script from a remote server, which is designed to deliver multiple payloads, including various types of malware. The downloaded PowerShell script employs obfuscation techniques and seeks to elevate privileges, potentially allowing attackers to deploy remote access trojans (RATs) that connect to command-and-control servers. The campaign has been linked to other malware execution chains that also utilize ClickFix lures. Security researchers recommend enhancing defenses through employee training and disabling the Windows Run box to mitigate risks associated with these attacks.

Tech Optimizer

November 17, 2025

Dragon Breath Uses RONINGLOADER to Disable Security Tools and Deploy Gh0st RAT

The threat actor Dragon Breath, also known as APT-Q-27 and Golden Eye, has been observed using a multi-stage loader called RONINGLOADER to deploy a modified variant of the remote access trojan Gh0st RAT, primarily targeting Chinese-speaking users. The campaign employs trojanized NSIS installers disguised as legitimate applications, such as Google Chrome and Microsoft Teams. The infection chain utilizes various evasion techniques, including a legitimately signed driver, custom Windows Defender Application Control policies, and manipulation of the Microsoft Defender binary. RONINGLOADER's attack chain involves delivering a DLL and an encrypted file labeled "tp.png," which contains shellcode. It attempts to neutralize security products by terminating processes associated with popular antivirus solutions in the region. Specific actions are taken against Qihoo 360 Total Security, including blocking network communication, injecting shellcode into the Volume Shadow Copy service, and restoring firewall settings. For other security processes, RONINGLOADER directly writes a driver to disk to perform process termination. The malware aims to inject a rogue DLL into "regsvr32.exe" to conceal its activities and launch a next-stage payload into high-privilege system processes. The final payload is a modified version of Gh0st RAT, capable of communicating with a remote server, configuring Windows Registry keys, clearing Windows Event logs, and capturing keystrokes and clipboard contents. Additionally, two interconnected malware campaigns identified by Palo Alto Networks Unit 42 employed brand impersonation to deliver Gh0st RAT to Chinese-speaking users. The first campaign, Campaign Trio, occurred between February and March 2025, while the second, Campaign Chorus, detected in May 2025, impersonated over 40 applications. Both campaigns utilized complex infection chains and trojanized installers hosted on domains that circumvented network filters. The second campaign also involved an embedded Visual Basic Script for launching the final payload through DLL side-loading.

Tech Optimizer

November 13, 2025

12 ways to find viruses on your PC for free (and how to remove them)

In cybersecurity, modern viruses operate subtly, making them hard to detect while stealing data. Signs of infection include unfamiliar programs, missing files, erratic browser behavior, frequent error messages, and disabled security settings. If infected, disconnect from the internet, boot into Safe Mode, and run a full scan with Windows Security or trusted antivirus software. To protect your PC, delete temporary files, reset browser settings, uninstall suspicious apps, scan external drives, install updates, change passwords, and avoid suspicious links. For suspicious files, use VirusTotal to check for malware. If problems persist, a complete reinstallation of Windows 11 may be necessary after backing up important files.

Tech Optimizer

November 7, 2025

If you’re still on Windows 10, switching to a new antivirus won’t be enough

Microsoft has officially ended support for Windows 10, which raises significant security concerns due to the lack of security patches. Microsoft Defender Antivirus (MSDA) will continue to provide protection for Windows 10 during the Extended Security Updates (ESU) period, which lasts until October 2028, but users without ESU will remain vulnerable. Upgrading to Windows 11 is a free option for legitimate Windows 10 license holders, ensuring access to the latest features and security updates. Alternatively, users can consider transitioning to Linux, with distributions like Linux Mint, Fedora, and Pop!_OS offering various advantages.

Tech Optimizer

October 29, 2025

Windows Defender Settings Explained for Windows 11 Users

Windows Defender, now known as Microsoft Defender Antivirus, is a security tool for PCs that protects against viruses and malware. To access its settings, press Windows + I, select Privacy & Security, then Windows Security, and click Open Windows Security. Key settings to review include: 1. Virus & Threat Protection: Enable real-time protection, cloud-delivered protection, and automatic sample submission. Run a Quick Scan for threats. 2. Firewall & Network Protection: Ensure the firewall is enabled for Domain, Private, and Public networks. 3. App & Browser Control: Activate SmartScreen features for apps and downloads. 4. Device Security: Check if Core Isolation is enabled for memory integrity protection. Users can customize notification settings to reduce pop-ups. Windows Defender can be temporarily disabled by toggling off Real-time protection. It can work alongside other antivirus programs but will disable its real-time protection if another antivirus is detected. For most users, Windows Defender provides sufficient protection. Automatic scans can be scheduled through Task Scheduler.

Tech Optimizer

October 26, 2025

How Your Computer Protects Itself from Viruses and Cyberattacks

Virus protection is essential in the digital landscape due to threats like ransomware, phishing, spyware, and trojans that can compromise personal data and financial security. Cybercriminals continuously innovate, leading to potential malware infections that can steal sensitive information, lock files for ransom, or degrade device performance. Windows includes Microsoft Defender Antivirus, which provides real-time protection, automatic updates, cloud-based scanning, and firewall features. macOS offers built-in security tools such as XProtect, Gatekeeper, and the Malware Removal Tool, alongside regular updates. Linux distributions like Ubuntu are designed with security in mind, featuring regular patches, AppArmor, and optional antivirus tools. Key features to look for in antivirus software include real-time scanning, firewall protection, web protection, email scanning, automatic updates, and parental controls. While built-in solutions are often sufficient for everyday users, advanced users may benefit from third-party antivirus software. Best practices for maintaining cyber hygiene include keeping software updated, avoiding unverified applications, using strong passwords, enabling two-factor authentication, and regularly backing up data.

Tech Optimizer

October 15, 2025

Microsoft Defender will still protect Windows 10 PCs now support has ended – but don’t make the mistake of relying on antivirus

Microsoft Defender Antivirus will continue to receive updates and new virus definitions on Windows 10 until October 2028, even after the operating system reaches its End of Life. Users are encouraged to enroll in the Extended Security Updates (ESU) program for enhanced protection.