Is keylog.sys safe?

Yes — keylog.sys is malicious. Do not use it. Quarantine this component with your antivirus, then remove or repair it through the official driver, firmware, or device-software package. Do not delete the driver or firmware file manually. 11 of 75 antivirus engines flag it (family: Rootkit.Agent.AJNQ). It behaves as a trojan — malware disguised as something harmless to trick you into running it. If you've already used it, see the removal and recovery steps below.

keylog.sys is a system driver or firmware component, about 53 KB. Our analysis identifies it as malicious (family: Rootkit.Agent.AJNQ) — a trojan — malware disguised as something harmless to trick you into running it. Because a file's name and icon can be faked, the safest way to identify it is by its cryptographic hash (below), not its filename.

11 of 75 antivirus engines flagged keylog.sys, 11 of them as outright malicious. The raw count alone does not establish safety or danger; we also weigh which engines flagged it and corroborating behavior, identity, reputation, and rule evidence. The malicious verdict comes from the complete saved evidence, not from this antivirus count by itself.

Act quickly. 1) Disconnect the device from the internet to stop the malware communicating or spreading. 2) Run a full scan with reputable anti-malware software (such as Malwarebytes) and quarantine everything it finds. 3) Change your important passwords from a DIFFERENT, clean device — many threats log keystrokes or steal saved credentials. 4) If you bank or shop on this device, watch closely for fraud and alert your bank. 5) For a confirmed infection, the most reliable fix is to back up your personal files and reinstall the operating system for a clean start.

To remove keylog.sys: 1) restart into Safe Mode (Safe Mode with Networking if you need to download a tool) so the malware doesn't auto-start. 2) Run a full scan with reputable anti-malware software and let it quarantine or delete the detections. 3) Quarantine this component with your antivirus, then remove or repair it through the official driver, firmware, or device-software package. Do not delete the driver or firmware file manually. 4) Check your browser extensions, startup items, and scheduled tasks for anything unfamiliar. 5) Reboot and scan again to confirm it's gone. If detections keep coming back, a clean operating-system reinstall is the most dependable cure.

keylog.sys is classified as a trojan — malware disguised as something harmless to trick you into running it. Engines attribute it to the Rootkit.Agent.AJNQ family. Knowing the family matters because it tells you the likely impact — data theft, remote control, file encryption, or unwanted ads — and guides the cleanup.

Yes — keylog.sys carries a valid digital signature from Microsoft Windows Hardware Compatibility Publisher, which confirms the file hasn't been tampered with since that publisher signed it. A valid signature is a positive signal, but note that malware is occasionally signed with stolen or abused certificates, so it isn't proof of safety on its own.

The SHA-256 hash of keylog.sys is bb1b4e46f1e4a7f17b1b04ee08c33400b2b6fd2327612a4d84da81e2656ba48b, and its MD5 is 78f8396b9daf27d08aeec10539eeab56. This hash is the file's unique fingerprint — two files with the same SHA-256 are identical. Use it to confirm you're looking at exactly this file (not just one with the same name) when comparing against antivirus databases or a download's published checksum.

This report reflects the scan run on June 4, 2026. Because a file's hash never changes, the identity of keylog.sys is fixed — but antivirus coverage improves over time, so a file that looks clean today can pick up detections later (and vice-versa). If you need the latest picture, MalwareTips staff can re-run the analysis from scratch.