Stop the malware
stealing your logins.A Windows security app that hunts infostealers, credential theft and ransomware, alongside Microsoft Defender.
RankShield Security is a behavioral guardian for Windows that watches how processes actually behave: it catches infostealers reading your browser logins and session cookies, credential theft, ransomware, clipboard clippers and boot tampering, records every detection as evidence you can check, and shares confirmed threats across the RankShield Network. Sixteen on-device agents, running with your antivirus, not instead of it.
The malware that wins
doesn’t look like malware.
Today’s most common Windows attack is quiet: an infostealer runs for a few seconds, copies the passwords, cookies and session tokens out of your browser, and leaves. With your session cookie, an attacker signs in as you and walks past your MFA. No dramatic virus, no ransom note, just your logged-in life, taken.
Watch the behavior,
not just the file.
RankShield’s sixteen agents watch for what attacks do: a stranger process reaching into your browser’s cookie store, credentials being dumped from memory, files encrypting en masse, a swapped clipboard address, scripts running only in memory. Legitimate software passes; the attack behaviors stand out.
Not just an alert.
A record you can act on.
When something’s wrong, RankShield tells you what it is and why it matters, and where it can, blocks the connection at the Windows firewall and guides you to contain it. Every finding is a signed, verifiable receipt, not a black-box score, so you can see and prove exactly what happened.
A threat seen once
protects everyone.
Every PC running RankShield is a sensor. When a threat is confirmed on one machine, a de-identified indicator, never your data, protects the next, and your other devices pre-arm. Companies keep a private fleet network, with an opt-in to the global one. More machines, more defense.
Your data
stays on your PC.
Analysis runs on your device, and sensitive content is redacted before anything leaves. Only a confirmed, de-identified indicator is shared to the network, and that’s about the attack, not you. Proof over data collection, verifiable protection you can check.
What is the RankShield Windows app?
RankShield Security for Windows is a behavioral security app that runs alongside Microsoft Defender, hunting the tactics real Windows attacks use, and records every detection as evidence you can check. The attacks that actually drain Windows users rarely look like a classic virus. They look like an ordinary process that quietly reaches into your browser to steal saved logins and session cookies, a script that runs only in memory, a tool that dumps the credentials cached on your machine, or ransomware that starts encrypting your files. Signature-scanning antivirus is strong against known-bad files but struggles with these behavior-driven, often fileless attacks. RankShield takes a behavior-and-provenance approach: sixteen on-device agents watch how processes act, weigh it against whether they are signed and where they came from, and surface the combinations that signal an attack, especially the infostealers and session-cookie theft that bypass MFA. It is not a registered antivirus; it is a second, verifiable layer that works with the one you have, and it records what it finds as evidence you can check, not a vague reassurance.
What do the agents actually watch for?
Sixteen agents run on-device, built around the behaviors that dominate real-world Windows attacks. Six of the highest-impact are below, not a signature list, but the actions and provenance that give an attack away.
Something reading your saved logins
Infostealers like Lumma, StealC and RedLine make money by copying your browser’s saved passwords, cookies and session tokens, then replaying the session to bypass your MFA. RankShield watches for a non-browser process reaching into Chrome, Edge, Brave or Firefox login and cookie stores, the exact move that defines this attack.
Tools dumping your credentials
It watches process activity for the patterns of credential theft: LSASS memory dumping, Mimikatz-style access, and encoded PowerShell, so an attacker harvesting the passwords cached on your machine is surfaced rather than silent.
Files being encrypted en masse
RankShield plants hidden decoy files in your folders and watches them. The instant a process starts encrypting or renaming them at speed, the signature of ransomware, it fires. It is a behavioral tripwire that pairs with Defender, not a kernel inline blocker.
A swapped crypto address
Clipper malware silently swaps a crypto wallet address you copied for the attacker’s, so your payment goes to them. RankShield watches for that same-coin address swap in the clipboard and warns you before you paste, reading only to detect, never changing your clipboard.
Malicious scripts that never hit disk
Modern attacks run in memory to dodge file scanners. By reading the Antimalware Scan Interface stream, RankShield sees the deobfuscated script content itself, the fileless activity a disk scan misses, and flags injection and bypass attempts.
Tampering below the OS
It checks the boot policy your PC relies on, Secure Boot, driver-signature enforcement, test-signing and debug state, and fingerprints the TPM measured-boot values so a change to what loads before Windows shows up as drift. It reports posture and detects tamper; it does not read raw firmware.
What can the app do — and what can’t it?
A company built on verifiability has to be honest about its own limits, so here they are plainly. RankShield reliably surfaces the high-impact behaviors that actually hit Windows users: infostealers reading your browser logins and session cookies, credential theft from memory, ransomware encrypting your files, clipboard clippers, fileless in-memory scripts, DNS exfiltration, malicious persistence, and boot-policy tampering. It records each finding as a signed receipt and, where it can, blocks the connection at the Windows firewall. What it does not do: it is not a registered antivirus and does not replace Microsoft Defender, it runs alongside it. It works in user mode, so it detects and contains behavior rather than blocking every threat inline at the kernel. Its ransomware protection is a decoy tripwire, effective against commodity ransomware but not a guarantee. It reports boot and firmware posture and detects tampering, but cannot read raw UEFI firmware. We tell you this up front because overstating what a security app can do is exactly the kind of unverifiable promise RankShield exists to replace.
Sixteen agents. Signed. On every Windows PC.
RankShield Security is free on the Microsoft Store, signed, and ships for both x64 and native ARM64, so it runs natively on Intel, AMD and ARM PCs including the Surface Pro X. It installs a guardian service plus a tray app and is self-contained, so it runs on a clean machine with no extra runtimes. Details shown here may change; the Microsoft Store listing is authoritative.
Ask RankShield about Windows security.
What is the RankShield Windows app?
RankShield Security for Windows is a behavioral security app that runs alongside Microsoft Defender and watches for the tactics real Windows attacks use, rather than matching files to a signature list. Sixteen on-device agents look for infostealers reading your browser logins and session cookies, credential-theft tools dumping the passwords cached on your PC, ransomware encrypting your files, clipboard clippers swapping crypto addresses, fileless in-memory scripts, and tampering with the boot process. When it sees something, it records the finding as verifiable evidence and, on confirmed threats, shares a de-identified indicator across the RankShield Network so an attack on one machine helps defend the next. It is a second, behavioral layer that complements your antivirus, not a replacement for it.
Is it an antivirus? Does it replace Microsoft Defender?
No, and we are deliberate about saying so. RankShield is not a registered antivirus and it does not replace Microsoft Defender; it runs alongside it as a behavioral guardian. Defender and other antivirus products are strong at matching known-bad files and providing kernel-level protection. RankShield adds a different, complementary layer: it watches how processes behave in user mode, focused on the modern attacks, especially infostealers and session-cookie theft, that slip past signature scanning because they use legitimate-looking tools and never drop an obvious virus file. Think of it as a second set of eyes trained on behavior and provenance, sharing what it confirms across the RankShield Network, working with your antivirus rather than competing with it.
Why do infostealers matter so much?
Because they steal the thing that unlocks everything: your logged-in sessions. An infostealer copies the passwords, cookies and session tokens saved in your browser, and with a stolen session cookie an attacker can often walk straight into your accounts without needing your password or your second factor, because the cookie says you are already authenticated. That is how MFA gets bypassed. Billions of credentials are traded this way, and the malware is designed to look ordinary and exit fast. RankShield’s browser-guard agent is built specifically for this: it watches for any non-browser process reaching into your browser’s login and cookie storage, the defining move of an infostealer, and surfaces it with evidence you can check.
Does the app read my files or send my data to the cloud?
No. RankShield analyzes behavior on your device. Sensitive content is redacted on-device before anything leaves: it reports the type and pattern of a threat, not your files, passwords or clipboard contents. When it confirms a threat, only a de-identified indicator, such as a malicious IP, domain or file hash, is shared to the RankShield Network to protect other machines, and even that is optional for enterprise fleets that keep their data private. It collects the device identifiers and diagnostics needed to operate, encrypted in transit, and you can request deletion. The design principle is proof over data collection: verifiable protection you can check, not your information harvested.
What does the app cost, and which PCs does it run on?
RankShield Security is free on the Microsoft Store. It is a signed app that installs on Windows 10 and 11, and it ships as both x64 and native ARM64 builds, so it runs natively on Intel and AMD PCs and on ARM devices like the Surface Pro X and Snapdragon laptops rather than through emulation. It installs the guardian as a Windows service plus a tray app, and it is self-contained, so it runs on a clean PC without extra runtimes. Pricing shown here may change; the Microsoft Store listing shows current details. Phones are covered by the separate RankShield apps for iOS and Android.
What can’t the app do? Where are its limits?
A company built on verifiability has to be honest about its ceilings, so here they are. RankShield runs in user mode alongside Defender; it is not a kernel-level antivirus, so it detects and contains behavior rather than blocking every threat inline before it executes. Its ransomware protection is a decoy-file tripwire, effective against commodity ransomware but not a guarantee, and a targeted attacker who avoids the decoys could evade it. It reports boot and firmware posture and detects boot-policy tampering, but it cannot read raw UEFI firmware or catch a firmware implant directly. It does not claim to stop everything, and it will never call itself unhackable or 100% secure. What it does reliably is surface the high-impact behaviors, above all infostealers and credential theft, that actually hit Windows users, and give you a record you can verify.
How does the RankShield Network make it stronger?
Every PC running RankShield is a sensor. When one machine confirms a threat, RankShield mints a de-identified indicator, an attacker IP, a domain, a file hash, never your data, and publishes it to the RankShield Network, so the next machine can pre-arm against a technique it has not seen yet. If it is one of your own devices, your other devices pre-arm too. For companies, a private tenant keeps a 200-machine fleet’s intelligence to itself, with an opt-in to contribute confirmed indicators to the global network. This is the same one-network model behind RankShield on every platform: a threat seen once helps protect everyone, and because each report is signed, the protection is verifiable rather than a black box.
Add a second layer in minutes.
Free on the Microsoft Store. Sixteen agents watching for the infostealers and credential theft that slip past signature scanning, working alongside your antivirus.