TROJ_QHOST.SMUC1

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Other System Modifications

This Trojan modifies the following file(s):

• %System%\drivers\etc\hosts

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

It deletes the following files:

• %Desktop%\Internet Explorer.url
• %Desktop%\Internet Explorer.lnk
• %Desktop%\Mozilla Firefox.lnk
• %Desktop%\360°²È«ÎÀÊ¿.lnk
• %Desktop%\360Èí¼þ¹Ü¼Ò.lnk
• %Desktop%\360ɱ¶¾.lnk
• %Desktop%\ÈðÐÇɱ¶¾Èí¼þ.lnk
• %Desktop%\ÐÞ¸´ÈðÐÇÈí¼þ.lnk
• %Desktop%\Õ˺ű£ÏÕ¹ñ.lnk
• %Start Menu%\Internet Explorer.url
• %Start Menu%\Internet Explorer.lnk
• %Start Menu%\Mozilla Firefox.lnk
• %Start Menu%\Programs\Internet Explorer.url
• %Start Menu%\Programs\Internet Explorer.lnk
• %Start Menu%\Programs\Mozilla Firefox.lnk
• %User Profile%\Quick Launch\Internet Explorer.url
• %User Profile%\Quick Launch\Internet Explorer.lnk
• %User Profile%\Quick Launch\Mozilla Firefox.lnk
• %User Profile%\Quick Launch\Æô¶¯ Internet Explorer ä¯ÀÀÆ÷.lnk
• %User Profile%\Quick Launch\ÈðÐÇɱ¶¾Èí¼þ.lnk
• %User Profile%\360se\360se_s.ini
• %User Profile%\×ÀÃæ\Internet Explorer.lnk
• %User Profile%\×ÀÃæ\ÌÔ±¦É̳Ç.lnk
• %System%\drivers\etc\hosts

(Note: %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Desktop on Windows Vista and 7.. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on Windows Vista and 7.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %System% is the Windows system folder, which is usually C:\Windows\System32.)

It adds the following registry keys:

HKEY_CLASSES_ROOT\htmfile

HKEY_CLASSES_ROOT\htmfile\DefaultIcon

HKEY_CLASSES_ROOT\htmfile\shell\
open\command

HKEY_CLASSES_ROOT\PlayFlashDXA

HKEY_CURRENT_USER\Software\Policies\
Microsoft\Internet Explorer\Control Panel

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
PlayFlashDXA
1 = 132df1

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
PlayFlashDXA
cdafile2 = 3d4a3

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
PlayFlashDXA
9 = 1

HKEY_CURRENT_USER\Software\Policies\
Microsoft\Internet Explorer\Control Panel
HomePage = 1

It modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
HideFileExt = 1

(Note: The default value data of the said registry entry is 1.)

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Start Page = "http://www.{BLOCKED}e.com"

(Note: The default value data of the said registry entry is http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Internet Explorer\Main
Start Page = "http://www.{BLOCKED}e.com"

(Note: The default value data of the said registry entry is http://www.microsoft.com/isapi/redir.dll?prd={SUB_PRD}&clcid={SUB_CLSID}&pver={SUB_PVER}&ar=home.)

It deletes the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced\Folder\Hidden\
SHOWALL

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced\Folder\SuperHidden

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced\Folder\HideFileExt

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced\HideFileExt

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\TypedUrls

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced\Folder\Hidden\
NOHIDDEN

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced\Folder\Hidden

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Internet

Dropping Routine

This Trojan drops the following files:

• %System%\msscp.reg
• %Program Files%\Common Files\System\taobao.ico
• %Desktop%\Internet Explorer.html
• %Start Menu%\Internet Explorer.html
• %Start Menu%\Programs\Internet Explorer.html
• %User Profile%\Quick Launch\Internet Explorer.html
• %Favorites%\Ãâ·Ñ¿´µçÓ°.url
• %Favorites%\ÌÔ±¦Íø£¡.url

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).. %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Desktop on Windows Vista and 7.. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on Windows Vista and 7.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %Favorites% is the current user's Favorites folder, which is usually C:\Documents and Settings\{user name}\Favorites on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Favorites on Windows Vista and 7.)

This report is generated via an automated analysis system.