Trojan.Agent - what it is, common signs, and how to remove it safely

Trojan.Agent

What it is

Trojan.Agent is a generic name security tools use for trojans that hide inside “normal” files or installers. Once you run them, they secretly give an attacker a foothold: downloading more malware, changing settings, or spying on activity. Because “Agent” is a broad label, details vary by sample, but the idea is the same - a sneaky helper that brings in worse stuff later. Quick overview and cleanup notes: https://gridinsoft.com/threats/trojan-agent

Why it matters

An Agent on your PC can steal logins, add more threats (stealers, ransomware), and keep coming back after reboots. The longer it runs, the more damage and data loss you may face.

How it works 

  • Disguise: arrives as a “viewer,” “update,” crack, or invoice attachment.

  • Execute: you open it; it installs quietly in user folders.

  • Persist: adds startup entries or scheduled tasks so it runs every boot.

  • Fetch: downloads extra payloads, changes settings, and talks to a control server.

Red flags

  • New tasks or Run keys launching random-named files from AppData/Temp.

  • Browser homepage/search changed; new extensions you didn’t add.

  • Security tool disabled or updates failing.

  • Unfamiliar programs using the network nonstop.

Do it right

  • Uninstall unknown add-ons, then run a full scan with a reputable anti-malware tool.

  • Reset browsers if they were hijacked; remove odd startup items and tasks.

  • Change passwords from a clean device and sign out of all sessions.

  • If problems persist or many files are affected, back up documents and consider a clean reimage.

    Glossary (A–Z)

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