When Adware.CWSIEFeats is executed, it performs the following actions:
- Creates or downloads the following files:
- [directory]\feat2.dll (detected as Adware.CWSIEFeats)
- %UserProfile%\Local Setting\Temp\2.tmp (a downloader that attempts to download a file from awmdabest.com and is detected as Downloader.Trojan)
- %System%\s.bat (a batch file dropped by 2.tmp that runs in a continuous loop in an attempt to delete 2.tmp. This causes the CMD.exe process to be active)
- %System%\mfceh.exe (downloaded by feat2.dll after it is registered and detected as Adware.CWSIEFeats)
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).
- %Userprofile% is a variable that refers to the current user's profile folder. By default, this is C:\Documents and Settings\<Current User> (Windows NT/2000/XP).
- Creates the following files:
- addlv.dll
- addmu32.dll
- addrm32.dll
- Creates an .html file, which replaces the about:blank file, under one of the following names:
- %Windir%\mshp.dll
- %Windir%kbxun.dl
Note:
- %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows (Windows 95/98/Me/XP)or C:\Winnt (Windows NT/2000).
- Creates a blacklist file under one of the following names:
- %Windir%\bl.dat
- %Windir%\mjjrr.dat
- Creates a file containing keywords for targeted advertising under one of the following names:
- %Windir%\keywords.dat
- %Windir%\jqfzv.dat
- %Windir%\rsicgq.log
- The file feat2.dll downloads one of the following files and registers it as a service:
- %Windir%\netrr.exe
- %System%\systk.ex
- The file 2.tmp downloads one of the following files, which is detected as Dialer.WSV:
- %System%\tibs3.exe
- %System%\sbar.exe
- The files feat2.dll, netrr.exe, and mfceh.exe create the following registry keys when they are registered so they are run whenever Internet Explorer is started:
HKEY_CLASSES_ROOT\CLSID\{E7EFBCA0-EAB9-E4C5-50C3-79622A93478A}
HKEY_CLASSES_ROOT\CLSID\{676575DD-4D46-911D-8037-9B10D6EE8BB5}
HKEY_CLASSES_ROOT\CLSID\{A5B6EDE1-CC5A-B569-AB04-69AC5C0B7B59}
HKEY_CLASSES_ROOT\CLSID\{7A7FFD7B-4E13-D1D1-FA76-0910B513E4DE}
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{E7EFBCA0-EAB9-E4C5-50C3-79622A93478A}
HKEY_LOCAL_MACHINE\Software\Microsoft\Internet Explorer\URLSearchHooks\{E7EFBCA0-EAB9-E4C5-50C3-79622A93478A}
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall\HSA
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall\SW
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall\SE
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Enum\Root\Legacy_[]*008*0010%AF*00E5*0003*0017*001A*00A4*00B6*00C0*00A8
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\[random ASCII characters]
- Adds the value:
"[adware file name]" = "%Windir%\system32\[adware file name]"
to the registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
so that the Adware runs every time Windows starts.
Note: "[adware file name]" may be the value "mfceh.exe".
- Modifies or creates the following values:
"Use Search Asst" = "no"
"Default_Page_URL" = "about:blank"
"StartPage" = "about:blank"
"Defaut_Search_URL" = "res://%Windir%\mshp.dll/sp.html#37049"
"Search Page" = "res://%Windir%\mshp.dll/sp.html#37049"
"Search Bar" = "res://%Windir%\mshp.dll/sp.html#37049"
in the registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main
to modify the Internet Explorer start page and search pages.
- Modifies or creates the values:
"Use Search Asst" = "no"
"Start Page" = "about:blank"
"Search Page" = "res://%Windir%\mshp.dll/sp.html#37049"
"Search Bar" = "res://%Windir%\mshp.dll/sp.html#37049"
in the registry key:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Internet Explorer\Main
to modify the Internet Explorer start page and search pages.
- Modifies or creates the value:
"SearchAssistant" = "res://%Windir%\mshp.dll/sp.html#37049"
in the registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Search
to modify the Internet Explorer search pages.
