Trojan.DownLoader26.3897

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)

Modifies file system:

Creates the following files:

C:\RCX9.tmp
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\chess.bmp.exe
<Current directory>\eKAw.ico
<Current directory>\XAsw.exe
<Current directory>\zkAo.ico
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\dirt bike.bmp.exe
%TEMP%\Lwsocgww.bat
<Current directory>\dMwm.exe
C:\RCXA.tmp
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\cat.bmp.exe
<Current directory>\NGYo.ico
<Current directory>\oIUM.exe
C:\RCX6.tmp
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\butterfly.bmp.exe
C:\RCX7.tmp
<Current directory>\KIQM.exe
C:\RCX8.tmp
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\car.bmp.exe
<Current directory>\iIgQ.ico
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\duck.bmp.exe
<Current directory>\sWck.ico
C:\RCXD.tmp
%TEMP%\xwQgcYQs.bat
<Current directory>\NAEU.exe
<Current directory>\TioQ.ico
<Current directory>\osEC.exe
C:\RCXE.tmp
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\fish.bmp.exe
<Current directory>\uUEo.exe
C:\RCXB.tmp
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\dog.bmp.exe
<Current directory>\LqQQ.ico
<Current directory>\iMoa.exe
<Current directory>\SSsc.ico
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\drip.bmp.exe
<Current directory>\sUso.ico
<Current directory>\wIIO.exe
C:\RCXC.tmp
<Current directory>\<File name>
<Current directory>\ZEsI.ico
C:\Documents and Settings\LocalService\gOEYMkgs\SSIkQYgQ
%TEMP%\OMUEUAYc.bat
<Current directory>\UMoo.exe
<Current directory>\wOEk.ico
%TEMP%\ogcgskss.bat
C:\RCX1.tmp
%TEMP%\jkMMIAgE.bat
%ALLUSERSPROFILE%\caQc.txt
%ALLUSERSPROFILE%\WuIEgAsU\lacMcYws
%HOMEPATH%\gOEYMkgs\SSIkQYgQ.exe
<Current directory>\<File name>GQVI
%HOMEPATH%\gOEYMkgs\SSIkQYgQ
%ALLUSERSPROFILE%\WuIEgAsU\lacMcYws.exe
%ALLUSERSPROFILE%\WuIEgAsU\lacMcYwsCOUK
%ALLUSERSPROFILE%\tuIMYcEM\ZgMYMIIENRTH
%ALLUSERSPROFILE%\tuIMYcEM\ZgMYMIIE.exe
%HOMEPATH%\gOEYMkgs\SSIkQYgQBLQV
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\ball.bmp.exe
<Current directory>\tyQE.ico
<Current directory>\CAwc.exe
C:\RCX4.tmp
<Current directory>\PQgA.exe
<Current directory>\sygs.ico
<Current directory>\oEkc.exe
C:\RCX5.tmp
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\beach.bmp.exe
<Current directory>\jowY.ico
C:\RCX2.tmp
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\airplane.bmp.exe
%TEMP%\aUIMwEcE.bat
<Current directory>\FIYS.exe
<Current directory>\PiwI.ico
%TEMP%\EmcwwkMY.bat
%ALLUSERSPROFILE%\Application Data\Microsoft\User Account Pictures\Default Pictures\astronaut.bmp.exe
<Current directory>\BsAQ.exe
C:\RCX3.tmp

Deletes the following files:

<Current directory>\eKAw.ico
<Current directory>\XAsw.exe
<Current directory>\zkAo.ico
<Current directory>\dMwm.exe
<Current directory>\iIgQ.ico
<Current directory>\oIUM.exe
<Current directory>\sygs.ico
<Current directory>\KIQM.exe
<Current directory>\NGYo.ico
%TEMP%\Lwsocgww.bat
<Current directory>\sUso.ico
<Current directory>\uUEo.exe
<Current directory>\sWck.ico
<Current directory>\NAEU.exe
%TEMP%\xwQgcYQs.bat
<Current directory>\LqQQ.ico
<Current directory>\iMoa.exe
<Current directory>\SSsc.ico
<Current directory>\wIIO.exe
<Current directory>\oEkc.exe
<Current directory>\UMoo.exe
%TEMP%\jkMMIAgE.bat
%TEMP%\ogcgskss.bat
<Current directory>\ZEsI.ico
%TEMP%\OMUEUAYc.bat
%HOMEPATH%\gOEYMkgs\SSIkQYgQBLQV
<Current directory>\<File name>GQVI
%ALLUSERSPROFILE%\tuIMYcEM\ZgMYMIIENRTH
%ALLUSERSPROFILE%\WuIEgAsU\lacMcYwsCOUK
%TEMP%\aUIMwEcE.bat
<Current directory>\jowY.ico
<Current directory>\CAwc.exe
<Current directory>\tyQE.ico
<Current directory>\PQgA.exe
<Current directory>\PiwI.ico
<Current directory>\wOEk.ico
<Current directory>\FIYS.exe
<Current directory>\BsAQ.exe
%TEMP%\EmcwwkMY.bat

Substitutes the following files:

<Current directory>\XAsw.exe
<Current directory>\dMwm.exe
<Current directory>\oIUM.exe
<Current directory>\KIQM.exe
<Current directory>\uUEo.exe
<Current directory>\NAEU.exe
<Current directory>\iMoa.exe
<Current directory>\wIIO.exe
<Current directory>\UMoo.exe
<Current directory>\FIYS.exe
%ALLUSERSPROFILE%\WuIEgAsU\lacMcYwsCOUK
<Current directory>\<File name>GQVI
<Current directory>\PQgA.exe
<Current directory>\oEkc.exe
<Current directory>\BsAQ.exe
<Current directory>\CAwc.exe

Network activity:

Connects to:

'74.##5.232.51':80

TCP:

HTTP GET requests:

http://google.com/ via 74.##5.232.51

UDP:

DNS ASK google.com

Miscellaneous:

Searches for the following windows:

ClassName: '' WindowName: 'SSIkQYgQ.exe'
ClassName: '' WindowName: 'Microsoft Windows'
ClassName: '' WindowName: 'lacMcYws.exe'

Creates and executes the following:

'%ALLUSERSPROFILE%\WuIEgAsU\lacMcYws.exe'
'%ALLUSERSPROFILE%\tuIMYcEM\ZgMYMIIE.exe'
'<Full path to file>'
'%HOMEPATH%\gOEYMkgs\SSIkQYgQ.exe'

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 HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /d 0 /t REG_DWORD /f
'<SYSTEM32>\cmd.exe' /c "<Current directory>\<File name>"
'<SYSTEM32>\reg.exe' add HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced /f /v HideFileExt /t REG_DWORD /d 1