Published Mar 29, 2008 | Updated Sep 15, 2017

TrojanDownloader:Win32/Zirit.A

Detected with Windows Defender Antivirus

Aliases: System Defender (other) Security System (other) W32/DLoader.GEAC (Norman) Troj/Drop-M (Sophos) Trojan.DR.Lodll.Gen (VirusBuster) Trojan-Downloader.Win32.Small.ivo (Kaspersky)

Summary

TrojanDownloader:Win32/Zirit.A is a trojan that advertises rogue security software suites. It also downloads these packages, and misleads the user into installing them by continuously presenting the user with fake security alerts.
Manual removal is not recommended for this threat. To detect and remove this threat and other malicious software that may have been installed, run a full-system scan with an up-to-date antivirus product such as Microsoft Security Essentials, or the Microsoft Safety Scanner. For more information about using antivirus software, see http://www.microsoft.com/security/antivirus/av.aspx.