What it is
Quasar RAT is a Windows remote-access trojan that lets attackers spy, steal data, and control a PC from afar. It shows up through fake emails or cracked software and blends in as a “normal” app. More detail in Gridinsoft’s explainer: https://gridinsoft.com/threats/quasar-rat
How it works - quick tour
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Delivered via phishing attachments, fake installers, or loaders.
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Runs in the background, often set to start with Windows.
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Grabs passwords, screenshots, and files - can log keys and move data out.
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Lets the attacker run commands, manage files, and pivot to other systems.
What you may notice
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Sudden slowdowns, fan spin-ups, or network spikes when idle.
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New or unknown startup items and scheduled tasks.
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Security tools disabled or updates failing.
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Odd prompts for admin rights.
If it hits - first moves
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Disconnect from the internet and stop using the PC for logins.
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Run a full scan with trusted anti-malware and remove detections.
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From a clean device, change passwords and enable MFA.
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Review recent logins, banking, and email forwarding rules.
Prevent it
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Be strict with attachments and installers - verify the source.
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Keep Windows and apps updated.
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Use real-time protection and block-script macros by default.
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Limit admin use and back up important files offline.