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Published Nov 14, 2007 | Updated Sep 15, 2017

Trojan:Win32/Agent.AGB

Detected by Microsoft Defender Antivirus

Aliases: W32/Captchas.A (Command) Trojan.Agent-8587 (Clam AV) Win32/Captchar.A (ESET) Trojan.Win32.Agent.brb (Kaspersky) Captchar (McAfee) W32/Agent.CUJF (Norman) Troj/CAPTCHA-A (Sophos) Win32.ExploreHijack (Sunbelt Software) Trojan.Captchar.A (Symantec) TROJ_CAPTCHAR.A (Trend Micro)

Summary

Trojan:Win32/Agent.AGB is a hacking tool designed to supply attackers with "Captcha" translations. The tool is designed to submit Captcha samples to a collection server.
 
Captcha is an acronym for "Completely Automated Public Turing test to tell Computers and Humans Apart". The main purpose for using Captcha is for human-authentication; it is used as a deterrent for attackers using automated methods of logging into chat rooms, or forums to post spam messages and advertisements.

Scan with antivirus software

To recover from this or other additional malicious software, you must run a full-system scan with an up-to-date antivirus product. Several companies provide antivirus software for this purpose. For more information, see http://www.microsoft.com/athome/security/downloads/default.mspx.
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