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Users are increasingly seeking effective malware protection without the cost of premium software, leading to the emergence of free antivirus programs that offer robust security features. This trend is particularly beneficial for Windows 11 users who want real-time protection while staying within budget.
Several leading cybersecurity firms provide free antivirus solutions equipped with advanced features such as real-time scanning, phishing defenses, cloud-based malware detection, and system optimization tools. These free programs can adequately protect a diverse audience, including gamers, remote workers, students, and casual users.
Top free antivirus programs for Windows 11 in 2025 include:
1. Bitdefender Antivirus Free: Utilizes the same malware engine as its paid version, offers real-time detection, anti-phishing protection, and is ultra-light on system resources.
2. Microsoft Defender Antivirus: Integrated into Windows 11, provides cloud-delivered protection and built-in ransomware mitigation without ads.
3. Avast Free Antivirus: Offers additional tools like network scanning and a Do Not Disturb mode for gaming.
4. AVG AntiVirus Free: Features a simpler interface, link and attachment protection, and fewer pop-ups.
5. TotalAV Free Antivirus: A newer option with a clean interface, real-time protection, and a junk file cleaner.
Key factors to consider when selecting free antivirus software include real-time protection, low resource usage, minimal intrusion, and extra security tools. While free solutions are suitable for most users, premium protection may be necessary for small businesses or those handling sensitive data.
For gamers, Bitdefender and Avast are recommended for their low system impact and gaming modes. For remote workers, Microsoft Defender and TotalAV are highlighted for their ease of use and integrated protections.
Essential features of effective antivirus programs include robust virus protection, real-time scanning, and a behavior shield to detect new threats. Performance should not significantly slow down the system, and the interface should be user-friendly.
Experts recommend Windows Defender for basic protection, with AVG and Avast receiving endorsements for their feature balance, while Bitdefender Free is noted for its detection rates and minimal system impact. Free antivirus programs may lack advanced features and technical support compared to paid versions.
A security vulnerability identified as CVE-2025-21204 has been discovered in the Windows Update Stack, allowing local attackers to execute unauthorized code and escalate privileges to SYSTEM-level access. This vulnerability, with a CVSS score of 7.8 (High), affects Windows 10 versions 1507, 1607, and 1809, among likely other supported Windows 10/11 and Windows Server versions. The flaw arises from a design issue where Windows Update processes do not properly follow directory junctions, enabling attackers with limited user privileges to redirect trusted paths to locations containing malicious code. Microsoft has introduced a mitigation strategy in its April 2025 cumulative update, which includes creating a new folder at the root of system drives and implementing detection rules for suspicious junction creations. Organizations are advised to apply the April 2025 security updates, restrict ACLs on specific directories, prevent symbolic link creation, and monitor file creation activities in certain directories.
The end of support for Windows 10 is approaching in October, but two editions will remain supported for two and seven more years, respectively. Windows 10 LTSC 2021 will receive mainstream support until January 12, 2027, and Windows 10 IoT Enterprise LTSC 2021 until January 13, 2032. LTSC versions lack the Windows Store and many modern applications, offering a streamlined experience with essential features only. Activation of LTSC editions requires an enterprise product key, obtainable through a Volume License Agreement. The IoT version is limited to US English, while the standard LTSC supports 38 languages. LTSC editions do not receive version upgrades, remaining on version 21H2 indefinitely. LTSC ISO files are not readily available on the Microsoft download page but can be accessed through the Microsoft portal with an enterprise license. Unauthorized third-party Windows distributions, such as Tiny11 and Atlas OS, exist but may violate Microsoft’s terms of service.
Investing in antivirus software is debated in cybersecurity, but some form of protection is necessary to guard against threats like malware, spyware, and ransomware. Windows Defender is a free built-in antivirus option for Windows, providing basic protection. Norton 360 Deluxe is a comprehensive paid option with advanced features. Other free antivirus programs include Bitdefender Antivirus Free, Avast, Avira, and AVG, each with varying levels of effectiveness and features. Paid antivirus software typically offers better security, advanced features, and dedicated customer support, making it worthwhile for users needing more than basic protection. Free trials for paid antivirus solutions are often available for evaluation.
Windows Defender Application Control (WDAC) is a built-in security feature on Windows PCs that restricts the execution of unauthorized software by allowing only trusted applications. However, hackers have discovered multiple methods to bypass WDAC, exposing systems to malware and cyber threats. Techniques for bypassing WDAC include using Living-off-the-Land Binaries (LOLBins), DLL sideloading, and exploiting misconfigurations in WDAC policies. Attackers can execute unauthorized code without triggering alerts from traditional security solutions, enabling them to install ransomware or create backdoors. Microsoft operates a bug bounty program to address vulnerabilities in WDAC, but some bypass techniques remain unpatched for long periods. Users can mitigate risks by keeping Windows updated, being cautious with software downloads, and using strong antivirus software.
Windows Security, previously known as Windows Defender, is a built-in security tool in Windows 10 and 11 that provides comprehensive protection against viruses and malware without requiring additional software. Users can perform manual scans, including Quick, Full, and Custom scans, to identify and eliminate threats. To run a scan, users must open Windows Security, navigate to "Virus & threat protection," and select the desired scan option. Windows Security also includes features such as real-time protection, firewall and network protection, app and browser control, device security, and account protection. It is essential to keep Windows Security updated with the latest virus definitions for optimal protection. Users can also schedule automatic scans for regular checks.
Windows users are facing security challenges, including a zero-day vulnerability that threatens Windows passwords and hackers bypassing Windows Defender. Microsoft has discontinued VPN support for Windows Defender users and withdrawn security support for Windows 10. A new folder named "inetpub" was created following the April 8 Patch Tuesday updates as part of the fix for CVE-2025-21204, a vulnerability in the Windows Update Stack. This folder has raised concerns among users, prompting Microsoft to advise against deleting it. The creation of the inetpub folder is intended to enhance security, although its purpose remains unclear. Microsoft confirmed that the folder is created regardless of whether Internet Information Services (IIS) is installed on the user's device.
A recent study has revealed a method that bypasses Microsoft’s Windows Defender antivirus by using direct system calls and XOR encryption techniques, exposing vulnerabilities in the security solution. The technique targets the user mode and kernel mode operations of Windows, allowing attackers to execute harmful code without detection. Researchers demonstrated that by directly invoking syscall instructions, they could evade security monitoring that typically occurs at the user mode level. They utilized XOR encryption to obfuscate malicious shellcodes, making them unrecognizable and undetectable by signature-based systems. Tests showed that a Meterpreter reverse shell payload, encrypted with XOR and executed via direct syscalls, successfully bypassed Windows Defender protections without leaving traces on the disk. This method has been effective since at least 2022 and continues to work against recent updates of Windows Defender. The researchers recommend that Microsoft enhance defenses with kernel-level monitoring of syscalls and advise organizations to implement additional security measures beyond Windows Defender.
April 2025 Patch Tuesday introduced fixes for over 120 vulnerabilities, including a critical zero-day vulnerability (CVE-2025-29824) that is actively exploited. CVE-2025-29824 is a user-after-free vulnerability in the Windows Common Log File System (CLFS), allowing privilege escalation to SYSTEM on compromised Windows machines. Microsoft has patched 32 CLFS vulnerabilities since 2022, with six exploited in the wild. Updates for Windows 10 are not yet available. Other notable vulnerabilities include CVE-2025-26663 and CVE-2025-26670, both unauthenticated user-after-free vulnerabilities in Windows LDAP, and CVE-2025-27480 and CVE-2025-27482 in Windows Remote Desktop Services. None of these vulnerabilities have been patched for Windows 10 systems, but updates are forthcoming. Microsoft reversed its decision to discontinue driver update synchronization to WSUS servers, confirming that WSUS will continue to synchronize driver updates.
