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Microsoft Security Intelligence
Published Jun 11, 2009 | Updated Sep 15, 2017

HackTool:WinNT/Tcpz.A

Detected by Microsoft Defender Antivirus

Aliases: Win-Trojan/Rootkit.11656 (AhnLab) Worm.Win32.AutoRun.ezt (Kaspersky) Win32/TCPZ.A (ESET) Win32/TCPZ.A (CA) Hacktool.Rootkit (Symantec) HKTL_TCPAGENT (Trend Micro)

Summary

HackTool:WinNT/Tcpz.A is a device driver that patches the Windows TCP/IP stack device driver to modify the concurrent TCP connection attempts limit.
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 the Microsoft Safety Scanner (http://go.microsoft.com/fwlink/?LinkId=212742). For more information, see http://www.microsoft.com/protect/computer/viruses/vista.mspx.
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