ThreatExpert Report: Trojan.Win32.Qhost.lsd, Trojan Horse, Mal/Generic-A, Trojan:Win32/Qhost.BJ..

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Submission Summary:

Submission details:

Submission received: 29 July 2009, 18:29:17
Processing time: 5 min 57 sec
Submitted sample:

File MD5: 0x298243013AC72C1DBC714F5688038A6C
File SHA-1: 0x3DD0B81D990C32158C3C93748753F29A77E21BA3
Filesize: 43,520 bytes
Alias:

Trojan Horse [Symantec]
Trojan.Win32.Qhost.lsd [Kaspersky Lab]
Mal/Generic-A [Sophos]
Trojan:Win32/Qhost.BJ [Microsoft]
Trojan-Dropper [Ikarus]
Dropper/Downloader.33684 [AhnLab]

Summary of the findings:

What's been found	Severity Level
Hosts file modification that may block access to the security web sites.
Contains characteristics of an identified security risk.

Technical Details:

Possible Security Risk

Attention! The following threat category was identified:

Threat Category	Description
	A malicious trojan horse or bot that may represent security risk for the compromised system and/or its network environment

File System Modifications

The following files were created in the system:

#	Filename(s)	File Size	File Hash	Alias
1	%Temp%\EvID4226Patch.exe	39,936 bytes	MD5: 0x18DFBBC85B46C2E1C85D763130EAE228 SHA-1: 0xFF6220E471D7B6E7DD207567044C6252AB69E097	Virtool.EvidPatch [Ikarus] packed with PE_Patch.UPX [Kaspersky Lab]
2	[file and pathname of the sample #1]	43,520 bytes	MD5: 0x298243013AC72C1DBC714F5688038A6C SHA-1: 0x3DD0B81D990C32158C3C93748753F29A77E21BA3	Trojan Horse [Symantec] Trojan.Win32.Qhost.lsd [Kaspersky Lab] Mal/Generic-A [Sophos] Trojan:Win32/Qhost.BJ [Microsoft] Trojan-Dropper [Ikarus] Dropper/Downloader.33684 [AhnLab]

Note:

%Temp% is a variable that refers to the temporary folder in the short path form. By default, this is C:\Documents and Settings\[UserName]\Local Settings\Temp\ (Windows NT/2000/XP).

The following file was modified:

%System%\drivers\etc\hosts

Notes:

%System% is a variable that refers to the System folder. By default, this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).

Registry Modifications

The following Registry Keys were created:

HKEY_USERS\.DEFAULT\Software\Microsoft\Internet Explorer\Download
HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Policies\Associations
HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Policies\Attachments
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Associations
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Attachments
HKEY_CURRENT_USER\Software\Classes\Software\Microsoft\Windows\CurrentVersion\Policies
HKEY_CURRENT_USER\Software\Classes\Software\Microsoft\Windows\CurrentVersion\Policies\Associations
HKEY_CURRENT_USER\Software\Classes\Software\Microsoft\Windows\CurrentVersion\Policies\Attachments
HKEY_CURRENT_USER\Software\Classes\Software\Microsoft\Internet Explorer
HKEY_CURRENT_USER\Software\Classes\Software\Microsoft\Internet Explorer\Download

The newly created Registry Values are:

[HKEY_USERS\.DEFAULT\Software\Microsoft\Internet Explorer\Download]

CheckExeSignatures = "no"
RunInvalidSignatures = 0x00000001

[HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Policies\Associations]

LowRiskFileTypes = ".zip;.rar;.nfo;.txt;.exe;.bat;.com;.cmd;.reg;.msi;.htm;.html;.gif;.bmp;.jpg;.avi;.mpg;.mpeg;.mov;.mp3;.m3u;.wav;"

[HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Policies\Attachments]

SaveZoneInformation = 0x00000001

[HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Download]

RunInvalidSignatures = 0x00000001

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Associations]

LowRiskFileTypes = ".zip;.rar;.nfo;.txt;.exe;.bat;.com;.cmd;.reg;.msi;.htm;.html;.gif;.bmp;.jpg;.avi;.mpg;.mpeg;.mov;.mp3;.m3u;.wav;"

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Attachments]

SaveZoneInformation = 0x00000001

[HKEY_CURRENT_USER\Software\Classes\Software\Microsoft\Windows\CurrentVersion\Policies\Attachments]

SaveZoneInformation = 0x00000001

[HKEY_CURRENT_USER\Software\Classes\Software\Microsoft\Windows\CurrentVersion\Policies\Associations]

LowRiskFileTypes = ".zip;.rar;.nfo;.txt;.exe;.bat;.com;.cmd;.reg;.msi;.htm;.html;.gif;.bmp;.jpg;.avi;.mpg;.mpeg;.mov;.mp3;.m3u;.wav;"

[HKEY_CURRENT_USER\Software\Classes\Software\Microsoft\Internet Explorer\Download]

CheckExeSignatures = "no"
RunInvalidSignatures = 0x00000001

The following Registry Value was modified:

[HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Download]

CheckExeSignatures = "no"

Other details

The HOSTS file was updated with the following URL-to-IP mappings:

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