Trojan.DownLoader7.29357

Technical Information

To ensure autorun and distribution:

Modifies the following registry keys:

[<HKCU>\Control Panel\Desktop] 'SCRNSAVE.EXE' = '%APPDATA%\Microsoft\Windows\rawcircle.scr'
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'advant' = '%APPDATA%\advant.exe'

Creates the following services:

[<HKLM>\SYSTEM\ControlSet001\Services\Browser] 'Start' = '00000002'
[<HKLM>\SYSTEM\ControlSet001\Services\SSDPSRV] 'Start' = '00000002'
[<HKLM>\SYSTEM\ControlSet001\Services\upnphost] 'Start' = '00000002'

Malicious functions:

To bypass firewall, removes or modifies the following registry keys:

[<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile] 'EnableFirewall' = '00000000'

To complicate detection of its presence in the operating system,

blocks the following features:

User Account Control (UAC)

Creates and executes the following:

%APPDATA%\Microsoft\Windows\rawcircle.scr /s

Executes the following:

<SYSTEM32>\net1.exe start SSDPSRV
<SYSTEM32>\net1.exe start upnphost
<SYSTEM32>\reg.exe ADD "HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile" /v EnableFirewall /t REG_DWORD /d 0 /f
<SYSTEM32>\net1.exe start browser
<SYSTEM32>\sc.exe config upnphost start= auto
<SYSTEM32>\reg.exe ADD "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System" /v EnableLUA /t REG_DWORD /d 0 /f
<SYSTEM32>\sc.exe config browser start= auto
<SYSTEM32>\sc.exe config SSDPSRV start= auto
<SYSTEM32>\reg.exe ADD "HKLM\Software\Microsoft\Internet Explorer\Main" /v Show_URLinStatusBar /t REG_SZ /d yes /f
<SYSTEM32>\reg.exe ADD "HKLM\Software\Microsoft\Internet Explorer\Main" /v Show_StatusBar /t REG_SZ /d yes /f
<SYSTEM32>\reg.exe DELETE "HKCU\AppEvents\Schemes\Apps\Explorer\Navigating\.Current" /f
<SYSTEM32>\reg.exe ADD "HKLM\Software\Microsoft\Internet Explorer\MINIE" /v ShowStatusBar /t REG_DWORD /d 1 /f
<SYSTEM32>\reg.exe ADD "HKLM\SOFTWARE\Policies\Microsoft\WindowsFirewall\DomainProfile" /v EnableFirewall /t REG_DWORD /d 0 /f
<SYSTEM32>\reg.exe ADD "HKLM\SOFTWARE\Policies\Microsoft\WindowsFirewall\StandardProfile" /v EnableFirewall /t REG_DWORD /d 0 /f
<SYSTEM32>\reg.exe ADD "HKLM\Software\Microsoft\Internet Explorer\Main" /v Show_FullURL /t REG_SZ /d yes /f
<SYSTEM32>\reg.exe ADD "HKLM\Software\Microsoft\Internet Explorer\Main\FeatureControl" /v FEATURE_WEBOC_POPUPMANAGEMENT /t REG_DWORD /d 0 /f
<SYSTEM32>\attrib.exe -R -H -S "%APPDATA%\Microsoft\Windows\rawcircle.scr"
<SYSTEM32>\attrib.exe +R +H +S "<SYSTEM32>\pcclean.exe"
<SYSTEM32>\reg.exe ADD "HKCU\Control Panel\Desktop" /v "SCRNSAVE.EXE" /t REG_SZ /d "%APPDATA%\Microsoft\Windows\rawcircle.scr" /f
<SYSTEM32>\attrib.exe +R +H +S "%APPDATA%\Microsoft\Windows\rawcircle.scr"
<SYSTEM32>\attrib.exe +R +H +S "%APPDATA%\advant.exe"
<SYSTEM32>\attrib.exe -R -H -S "%APPDATA%\advant.exe"
<SYSTEM32>\attrib.exe -R -H -S "<SYSTEM32>\pcclean.exe"
<SYSTEM32>\reg.exe ADD "HKCU\software\microsoft\windows\currentversion\run" /v "advant" /t REG_SZ /d "%APPDATA%\advant.exe" /f
<SYSTEM32>\net1.exe START seclogon
<SYSTEM32>\reg.exe ADD "HKCR\.rar\ShellNew" /v "FileName" /t REG_SZ /d "%APPDATA%\newzip.dat" /f
<SYSTEM32>\reg.exe DELETE "HKCU\software\microsoft\windows\currentversion\action center\checks" /f
<SYSTEM32>\reg.exe ADD "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced" /v EnableBalloonTips /t REG_DWORD /d 0 /f
<SYSTEM32>\reg.exe ADD "HKCU\Control Panel\Desktop" /v ScreenSaveTimeOut /t REG_SZ /d "60" /f
<SYSTEM32>\reg.exe ADD "HKCU\Control Panel\Desktop" /v ScreenSaveActive /t REG_SZ /d "1" /f
<SYSTEM32>\reg.exe ADD "HKCR\.zip\CompressedFolder\ShellNew" /v "FileName" /t REG_SZ /d "%APPDATA%\newzip.dat" /f
<SYSTEM32>\reg.exe ADD "HKCR\.zip\ShellNew" /v "FileName" /t REG_SZ /d "%APPDATA%\newzip.dat" /f

Modifies file system :

Creates the following files:

%APPDATA%\5.dat
%APPDATA%\4.dat
%APPDATA%\3.dat
%APPDATA%\moggy.dll
%HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\U98D4X8H\ver[1].php
C:\Documents and Settings\LocalService\Application Data\Microsoft\UPnP Device Host\upnphost\udhisapi.dll
%APPDATA%\newzip.dat
%APPDATA%\2.dat
%APPDATA%\advant.exe
%HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\KHMHGZ4F\ver[1].php
<SYSTEM32>\pcclean.exe
%APPDATA%\1.dat
%APPDATA%\0.dat
%APPDATA%\Microsoft\Windows\rawcircle.scr