Trojan.DownLoader25.16348

Technical Information

To ensure autorun and distribution:

Modifies the following registry keys:

[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Userinit' = '<SYSTEM32>\userinit.exe,%ALLUSERSPROFILE%\WuIEgAsU\lacMcYws.exe,'
[<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'lacMcYws.exe' = '%ALLUSERSPROFILE%\WuIEgAsU\lacMcYws.exe'
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'SSIkQYgQ.exe' = '%HOMEPATH%\gOEYMkgs\SSIkQYgQ.exe'

Creates the following services:

[<HKLM>\SYSTEM\ControlSet001\Services\vwYgEQEb] 'ImagePath' = '%ALLUSERSPROFILE%\tuIMYcEM\ZgMYMIIE.exe'
[<HKLM>\SYSTEM\ControlSet001\Services\vwYgEQEb] 'Start' = '00000002'

Malicious functions:

To complicate detection of its presence in the operating system,

forces the system hide from view:

hidden files
file extensions

blocks the following features:

User Account Control (UAC)

Executes the following:

'<SYSTEM32>\reg.exe' add HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced /f /v Hidden /t REG_DWORD /d 2
'<SYSTEM32>\reg.exe' add HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced /f /v HideFileExt /t REG_DWORD /d 1
'%TEMP%\setup.exe'
'<SYSTEM32>\reg.exe' add HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /d 0 /t REG_DWORD /f
'%ALLUSERSPROFILE%\WuIEgAsU\lacMcYws.exe'
'%HOMEPATH%\gOEYMkgs\SSIkQYgQ.exe'
'<SYSTEM32>\cmd.exe' /c %TEMP%\setup.exe
'%ALLUSERSPROFILE%\tuIMYcEM\ZgMYMIIE.exe'

Modifies file system:

Creates the following files:

%HOMEPATH%\gOEYMkgs\uQcY.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\horses.bmp.exe
%HOMEPATH%\gOEYMkgs\lQwY.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\guitar.bmp.exe
%HOMEPATH%\gOEYMkgs\TMYC.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\lift-off.bmp.exe
%HOMEPATH%\gOEYMkgs\RYwa.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\kick.bmp.exe
%HOMEPATH%\gOEYMkgs\qgQQ.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\duck.bmp.exe
%HOMEPATH%\gOEYMkgs\KIcC.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\drip.bmp.exe
%HOMEPATH%\gOEYMkgs\DIEM.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\frog.bmp.exe
%HOMEPATH%\gOEYMkgs\twoo.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\fish.bmp.exe
%HOMEPATH%\gOEYMkgs\VIIs.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\guest.bmp.exe
%HOMEPATH%\gOEYMkgs\kgUC.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\snowflake.bmp.exe
%HOMEPATH%\gOEYMkgs\yMcc.exe
%ALLUSERSPROFILE%\Documents\My Music\Sample Music\Beethoven's Symphony No. 9 (Scherzo).wma.exe
%HOMEPATH%\gOEYMkgs\EEsM.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\%USERNAME%.bmp.exe
%HOMEPATH%\gOEYMkgs\zgsU.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\pink flower.bmp.exe
%HOMEPATH%\gOEYMkgs\dsMI.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\palm tree.bmp.exe
%HOMEPATH%\gOEYMkgs\OMMe.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\skater.bmp.exe
%HOMEPATH%\gOEYMkgs\WAIu.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\red flower.bmp.exe
%HOMEPATH%\gOEYMkgs\vkkA.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\dog.bmp.exe
%TEMP%\WER05ea.dir00\ZgMYMIIE.exe.mdmp
%TEMP%\WER05ea.dir00\ZgMYMIIE.exe.hdmp
%TEMP%\WER6e56.dir00\manifest.txt
%ALLUSERSPROFILE%\caQc.txt
%HOMEPATH%\gOEYMkgs\nUku.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\airplane.bmp.exe
%TEMP%\WER05ea.dir00\appcompat.txt
%TEMP%\WER05ea.dir00\manifest.txt
%HOMEPATH%\gOEYMkgs\SSIkQYgQ.exe
%ALLUSERSPROFILE%\WuIEgAsU\lacMcYws.exe
%HOMEPATH%\gOEYMkgs\SSIkQYgQ
%ALLUSERSPROFILE%\WuIEgAsU\lacMcYws
%TEMP%\WER6e56.dir00\ZgMYMIIE.exe.hdmp
%TEMP%\WER6e56.dir00\appcompat.txt
%ALLUSERSPROFILE%\tuIMYcEM\ZgMYMIIE.exe
%TEMP%\WER6e56.dir00\ZgMYMIIE.exe.mdmp
%HOMEPATH%\gOEYMkgs\eQEy.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\cat.bmp.exe
%HOMEPATH%\gOEYMkgs\ekIe.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\car.bmp.exe
%HOMEPATH%\gOEYMkgs\gkkA.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\dirt bike.bmp.exe
%HOMEPATH%\gOEYMkgs\ncsC.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\chess.bmp.exe
%HOMEPATH%\gOEYMkgs\LQUA.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\ball.bmp.exe
%HOMEPATH%\gOEYMkgs\Zwwk.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\astronaut.bmp.exe
%HOMEPATH%\gOEYMkgs\ZQkQ.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\butterfly.bmp.exe
%HOMEPATH%\gOEYMkgs\dAYe.exe
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\beach.bmp.exe
%HOMEPATH%\gOEYMkgs\bEEG.exe