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Trojan:Win32/Qhost.BI
Detected by Microsoft Defender Antivirus
Aliases: Win32/Qhost.NMK (ESET)
Summary
Trojan:Win32/Qhost.BI is a trojan that modifies the affected system's hosts file to redirect online banking sites to sites of the attacker's choice (possibly for phishing attempts). It modifies the hosts file periodically.
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.
Trojan:Win32/Qhost.BI may attempt to steal sensitive and confidential information from affecters users in order to perpetrate fraud. If you believe that your personal financial information may have been compromised, please refer to the following advisory for additional advice:
To recreate a clean HOSTS file:
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Click Start, and click Run.
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Open the Hosts file, according to operating system:
On Windows 95, Windows 98, or Windows ME systems:
In the Open field, type: notepad %windir%\hosts
On Windows NT-based operating systems, such as Windows 2000 or Windows XP:
In the Open field, type: notepad<system folder>\drivers\etc\hosts
-- for example, on Windows 2000:
In the Open field, type: notepad C:\WINNT\system32\drivers\etc\hosts
-- or on Windows XP:
In the Open field, type: notepad C:\Windows\system32\drivers\etc\hosts
On Windows Vista:
Click Start, click All Programs, click Accessories, right-click Notepad, and then click Run as administrator
Click File, click Open, type: %windir%\system32\drivers\etc\hosts, and then click Open -
On the first line of the HOSTS file, type: 127.0.0.1 localhost as in the following example after modifying a default 'hosts' file:
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Save the file to the same location you opened it from.
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Close Notepad.
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