Open Source Windows Anti-Malware Software
Sort By:
Anti-Malware Software for Windows
View 56 business solutionsBrowse free open source Anti-Malware software and projects for Windows below. Use the toggles on the left to filter open source Anti-Malware software by OS, license, language, programming language, and project status.
-
Gen AI apps are built with MongoDB AtlasMongoDB Atlas is the developer-friendly database used to build, scale, and run gen AI and LLM-powered apps—without needing a separate vector database. Atlas offers built-in vector search, global availability across 115+ regions, and flexible document modeling. Start building AI apps faster, all in one place.
-
Go beyond a virtual data room with Datasite DiligenceThe data room with a view. Evolved for next-generation M&A. Built on decades of deal experience. Packed with expert tools, yet intuitive for novices. A fully mobile platform with frictionless processes. Smart AI tools that let you close more deals, faster, plus end-to-end support at all times. Do due diligence with intelligence.
-
1
ClamWin
Antivirus software with virus scanning and virus definition updates
Looking for free Open Source Antivirus for Windows? Download ClamWin Free Antivirus and get free virus scanning and free virus definition updates. Free Antivirus software for Windows, using the well-respected ClamAV scanning engine. Includes virus scanner, scheduler, virus database updates, context menu integration to MS Windows Explorer and Add-in to MS Outlook. Also features easy setup program.">
-
2
HiJackThis
A free utility that finds malware and other threats
-- WARNING -- HiJackThis is an inactive project and it is not updated anymore. You may want to look at the existent unofficial forks though: https://github.com/dragokas/hijackthis/ -- HijackThis is a free utility that generates an in depth report of registry and file settings from your computer. HijackThis scan results make no separation between safe and unsafe settings , which gives you the ability to selectively remove items from your machine. In addition to scan and remove capabilities, HijackThis comes with several useful tools to manually remove malware from your computer. However, HijackThis does not make value based calls between what is considered good or bad. It is important to exercise caution and avoid making changes to your computer settings, unless you have expert knowledge. Source code is available SourceForge, under Code and also as a zip file under Files. -
3
FLARE VM
A collection of software installations scripts for Windows systems
FLARE VM is a security-focused Windows workstation distribution designed for malware analysis, reverse engineering, penetration testing, and threat hunting. It bundles a curated set of tools—disassemblers, debuggers, decompilers, virtualization, forensics utilities, packet capture tools, exploit frameworks, and hex editors—preconfigured to work together. The environment configures paths, dependencies, environment variables, and common tool integrations so analysts can focus on tasks rather than setup. Updates and modular installation let users include only the tools that match their workflow, keeping the VM lean and current. Because security toolchains often clash (DLL versions, signing, privileges), FLARE VM’s packaging handles compatibility issues ahead of time. For investigations involving malware unpacking, sandboxing, static analysis, or code reversing on Windows, the platform dramatically accelerates readiness and consistency across analysts. -
4
YARA
The pattern matching swiss knife for malware researchers
YARA is a tool aimed at (but not limited to) helping malware researchers to identify and classify malware samples. With YARA you can create descriptions of malware families (or whatever you want to describe) based on textual or binary patterns. Each description, a.k.a rule, consists of a set of strings and a boolean expression which determines its logic. YARA is multi-platform, running on Windows, Linux and Mac OS X, and can be used through its command-line interface or from your own Python scripts with the yara-python extension. YARA-CI may be a useful addition to your toolbelt. This is GitHub application that provides continuous testing for your rules, helping you to identify common mistakes and false positives. If you plan to use YARA to scan compressed files (.zip, .tar, etc) you should take a look at yextend, a very helpful extension to YARA developed and open-sourced by Bayshore Networks. -
Marketing automation for any business | ActiveCampaignActive Intelligence revolutionizes how you work. You guide direction while AI handles execution, acts on insights, and shows you the path forward. It's how marketing should be.
-
5
Shortcut Virus Removal Tool
Powerful and Easy to Use USB Shortcut Virus Removal Tool for Windows
Shortcut Virus Removal Tool Shortcut Virus Removal Tool is a powerful, portable, easy to use and safe program for fixing USB drives, external HDD / SSD drives and computers infected with shortcut virus. With only one click, you can remove shortcut virus from your computer and USB disk drive. It can restore files hidden by a virus and remove suspicious shortcuts and files from your USB drive and computer. It can repair registry and undo unwanted changes made by malware. It can also delete autorun virus from your USB drive. It has a very simple interface. You just have to select your USB drive from list and click Clean button. If the tool does not work, please right click and "Run as Administrator." The tool currently supports three languages: English, German and Turkish. This tool requires .NET Framework 4.0 and Windows XP or later.">
-
6
Clam sentinel is a program that detects file system changes and automatically scans the files added or modified using ClamWin. Require the installation of ClamWin. For Microsoft Windows 98/98SE/Me/2000/XP/Vista, Windows 7 and Windows 8.1.
-
7
Cuckoo Sandbox
Cuckoo Sandbox is for automated analysis of malware
Cuckoo Sandbox uses components to monitor the behavior of malware in a Sandbox environment; isolated from the rest of the system. It offers automated analysis of any malicious file on Windows, Linux, macOS, and Android. -
8
Robolinux
Announcing Robolinux Cinnamon 14.1
Announcing The New Robolinux Series 14 Mate LTS - 2034 Robolinux is very pleased to announce a completely new 14.1 Mate privacy centered 1inux operating system you can download freely while also offering our users an optional 14+ advanced upgrade which comes with our Untracker and FAAST Boot along with one click popular privacy software installers like Tor and I2p, Wireshark and Bleachbit plus many more for a fair and reasonable price. Robolinux14.1-Mate is ideal for beginners and advanced users. We are proud that it comes with Enoch AI which is TOTALLY 100% PRIVATE, FREE, HONEST & UNCENSORED built into Robolinux Cinnamon 14.1 The Robolinux 14.1 version with rock solid Long Term Support through 2034! requires users to set secure boot in their BIOS. It is currently available in the Cinnamon desktop flavor. we will release series 14 Xfce version in the next two months.For more information please see Readme file. Warmest regards John Martinson Robolinux.org -
9
Full Stack Computer Scanner
Scans the entire computer device "stack" (hardware, software, comms)
The FULL STACK COMPUTER SCANNER is a proprietary FREEWARE Windows system diagnostics tool designed to help users assess a computer’s overall security posture. The application performs read-only analysis across 50 system sectors, including hardware, firmware, boot, OS configuration, software, files, browser extensions, and network-related indicators. The scanner does not remove, block, quarantine, or modify anything. This is the initial 2026 public release of a transparency-first diagnostic tool focused on visibility, awareness, and education, rather than automated remediation. The project includes the application, full documentation, architecture disclosure, and detailed explanations of each scan area. Proprietary Freeware (not open source). See Freeware License 2026.txt for full terms. Optional independent written diagnostic reports are available for users who want professional interpretation of results. KCJ Tech Solutions Email Contact: computerscannerapp@gmail.com -
We help you deliver Virtual and Hybrid Events using our Award Winning end-to-end Event Management PlatformEventsAIR have been anticipating and responding to the ever-changing event industry needs for over 30 years, providing innovative solutions that empower event organizers to create successful events around the globe.
-
10
Rinzler USB Cleaner
V2.0-Unhides Folder/Files,removes malicious scripts from USB Drive
V2.0 (30th Dec 2014). It is a USB Malware Cleaner. This is a small tool that removes malicious scripts created by virus or malware, unhides folder and files, deletes all shortcut from selected drive. Also disables autorun completely and provides option to enable registry, folder options and task manager. Visit the project website for more information.">
-
11
theZoo
A repository of LIVE malwares for malware analysis and security
theZoo is a project created to make the possibility of malware analysis open and available to the public. Since we have found out that almost all versions of malware are very hard to come by in a way which will allow analysis, we have decided to gather all of them for you in an accessible and safe way. theZoo was born by Yuval tisf Nativ and is now maintained by Shahak Shalev. theZoo’s purpose is to allow the study of malware and enable people who are interested in malware analysis (or maybe even as a part of their job) to have access to live malware, analyse the ways they operate, and maybe even enable advanced and savvy people to block specific malware within their own environment. Please remember that these are live and dangerous malware! They come encrypted and locked for a reason! Do NOT run them unless you are absolutely sure of what you are doing! They are to be used only for educational purposes. -
12
Simple Software-restriction Policy
Control which folders programs can be run from.
A software policy makes a powerful addition to Microsoft Windows' malware protection. In particular, it is more effective against ransomware than traditional approaches to security. If you know about the Linux 'execute permission' bit then you'll understand what this is for. The mode of operation is somewhat different in that execute permission is granted to folders and subfolders rather than individual files, but the intention is the same, to stop undesirable or unknown software from launching unless you OK it. Additionally, it is possible to specify that certain executables (typically browsers and email clients) are run with reduced rights. This is a valuable damage-limitation measure against browser plugin vulns, etc. The protection can be turned off without a reboot whilst installing legitimate software, and will automatically reactivate after a specified time -
13
Junkware Removal Tool (JRT)
Remove junkware from your PC
Junkware Removal Tool (JRT) is a free security utility for Microsoft Windows. It scans for and removes unwanted programs, including adware, toolbars, and potentially unwanted programs (PUPs). JRT also removes any traces of these programs from your registry and other places where debris accumulates. JRT is a stand-alone tool that doesn't require installation. To remove JRT, you can manually delete the icon on your desktop by right-clicking on it and choosing delete. -
14
RogueKiller
The next generation virus killer. Remove unknown malware
The next generation virus killer. Remove unknown malware, stay protected. Free virus cleaner for everyone. Thanks to its powerful engine RogueKiller is able to find known and unknown malware, of all kind. Search and clean viruses, ransomware, trojans and other malware. Powered with innovative Artificial Intelligence and Cloud signatures engine, RogueKiller is the best virus removal tool. Try our free virus cleaner now for free ! RogueKiller antimalware software is shipped with state-of-the-art malware protection. The real time protection stops infected programs before they execute. Don't let malicious software setup, stop them before they do harmful actions! Protect your important documents against corruption and theft. With the increasing threat of Ransomware, it's very important to keep your documents secured. Don't be the next victim of a thousand dollars ransom, turn RogueKiller anti ransomware protection on! -
15
Al-Khaser
Public malware techniques used in the wild: Virtual Machine, Emulation
al-khaser is an open-source proof-of-concept security tool that deliberately implements techniques commonly used by real-world malware to test and evaluate the effectiveness of antivirus and endpoint detection and response (EDR) systems. It’s written in C/C++ and designed to execute a wide range of anti-analysis, anti-debugging, anti-virtualization, timing-based evasion, and sandbox detection routines so security researchers and defenders can see how well their tools detect or ignore these behaviors. The project includes checks for debugger presence, stealthy anti-dumping measures, various VM and sandbox artifacts, and process injection techniques, giving you a broad view of how defensive tools respond under stress. al-khaser isn’t malicious by intent — its purpose is to help security teams identify gaps in their detection logic and harden defenses by simulating evasive behaviors without actual payloads. -
16
Spybot Search and Destroy
Protect your computer against malware
Spybot - Search & Destroy is an anti-spyware and privacy protection tool that has been providing quality security solutions since the early 2000's. Spybot S&D provides complete anti-malware and anti-spyware protection as the System Scan aims to detect and remove all kinds of threats from your Windows PC. These include Adware, Spyware, Trojans and many more. Spybot's Immunization feature keeps you safe online by preventing access to malicious sites and blocks tracking cookies. Spybots Forensics Detectives are constantly on the look out for the latest forms of malware and continuly adding new detection rules. -
17
clamwin portable
portable zipped version of the free and open source antivirus ClamWin
portable zipped version of the free and open source antivirus ClamWin. ClamWin is a Free Antivirus program for Microsoft Windows 10 / 8 / 7 / Vista / XP / Me / 2000 / 98 and Windows Server 2012, 2008 and 2003. ClamWin Free Antivirus is used by more than 600,000 users worldwide on a daily basis. It comes with an easy installer and open source code. You may download and use it absolutely free of charge. Just unzip and run \bin\ClamWin.exe http://www.clamwin.com https://sourceforge.net/projects/clamwin -
18
A tool to block viruses in USB flash/disk from auto-running. When a USB disk is inserted, this tool not only locks the "autorun.inf" file, but also locks all the autorun-related virus and other suspicious files.
-
19
Detekt
Malware triaging tool
Detekt is a free Python tool that scans your Windows computer (using Yara, Volatility and Winpmem) for traces of malware. Specifically, it can detect the presence of pre-defined patterns which are unique identifiers of commercial surveillance spyware FinFisher FinSpy and HackingTeam RCS. Note however, that Detekt may not be able to detect the most recent versions of those malware families. They may have been updated or have other versions not detected by this tool. -
20
readpe
The PE file analysis toolkit
readpe (formerly known as pev) is a multiplatform toolkit to work with PE (Portable Executable) binaries. Its main goal is to provide feature-rich tools for properly analyze binaries with a strong focus on suspicious ones. -
21
FileGrab
Capture newly created files in Windows filesystems
FileGrab is a tool that monitors a Windows filesystem for newly created files and copy those files to another location. It can be useful for honeypots, malware analysis, investigation scenarios and so on. -
22
USB Paranoiac
USB Security Scanner on Linux
This program allows you to examine suspicious USB storage devices before plugging them into your Windows computer. This is not an antivirus; it does not have heuristic or automatic detection-cleanup features. Just so you know, executable files are worth your attention. You decide whether they're dangerous or not. https://github.com/shampuan/USB-Paranoiac -
23
EG ClamNet Antivirus
A simple antivirus that provide a graphical interface for ClamAV
EG ClamNet Antivirus provides a graphical user interface for ClamAV Executables. EG ClamNet antivirus is simple and user friendly antivirus (currently for Windows OS ) that uses ClamAV as an internal scanning engine to detect trojans, viruses, malware and other known malicious threats. It can be installed on the existing default windows antivirus (Windows Defender) and compatible with it as extra protection. 1) Antivirus & Internet Security: EG ClamNet Antivirus is powered by ClamAV which has fast scanning, detects over 9 millions viruses, malware, worms and trozens. It also protects from MS Office macro viruses, mobile malware, other threats (including known ransomware). 2) Cleaner: EG ClamNet Antivirus has an additional feature of effective cleaning of junk files. With this feature you can optimize your system, increase memory space and system speed by cleaning junk files. Cleaning such junk files improves your system's security and speed-up your system. -
24
ComboFix
Scan for and remove malware and spyware
Combofix is a freeware program that scans and removes malware and spyware from computers running Windows XP, Vista, 7, and 8. It was created by sUBs and is designed for advanced users. Combofix can remove malware that other products cannot. It backs up your registry hives, quarantines files, and creates a log of its actions. -
25
CyberGod KSGMPRH
Open-Source antivirus for Windows
This is an effective tool which is capable of detecting thousands and thousands of malware in your PC, including the shortcut virus to nasty ransomware, The database is regularly updated. See the video for how to use this tool. Version: 1.3 MD5: 707D4BE2AA4547A542A7EEFDB7BC4C4D SHA-1: 899B80928DF59C5745B56480DAA6A51E7F65CB18A4 Source code MD5: 38B3A08D62E7ADD2EE30FCA375207499 IMPORTANT: =========== FULL VERSION : https://sourceforge.net/projects/cybergod-ksgmprh/ NOTE: ===== If this tool has helped you consider supporting it please http://bit.ly/supportCyberGodKSGMPRH via paypal http://bit.ly/CyberGodSecurityDonate