Trojan.DownLoader12.31787

Technical Information

To ensure autorun and distribution:

Modifies the following registry keys:

[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Userinit' = '<SYSTEM32>\userinit.exe,%ALLUSERSPROFILE%\vesswIQA\AcIcUcAM.exe,'
[<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'AcIcUcAM.exe' = '%ALLUSERSPROFILE%\vesswIQA\AcIcUcAM.exe'
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'jaQEcQMQ.exe' = '%HOMEPATH%\NIMMEwsg\jaQEcQMQ.exe'

Creates the following services:

[<HKLM>\SYSTEM\ControlSet001\Services\FkYQcQph] '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)

Creates and executes the following:

'%ALLUSERSPROFILE%\lwQggIEM\nwAEcgMA.exe'
'%ALLUSERSPROFILE%\vesswIQA\AcIcUcAM.exe'
'%HOMEPATH%\NIMMEwsg\jaQEcQMQ.exe'

Executes the following:

'<SYSTEM32>\cmd.exe' /c ""%TEMP%\OsIYUMwE.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\PucsQQMQ.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\FkkEkAkg.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\HUQcQkwE.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\mWIUIYgI.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\WIwoEgYQ.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\kiUUIwMA.bat" "<Full path to virus>""
'<SYSTEM32>\reg.exe' add HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /d 0 /t REG_DWORD /f
'<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
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\jeUEEgEw.bat" "<Full path to virus>""
'<SYSTEM32>\cscript.exe' %TEMP%\file.vbs
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\csAIAEUI.bat" "<Full path to virus>""

Modifies file system :

Creates the following files:

<Current directory>\AOcQ.ico
<Current directory>\zYok.exe
%TEMP%\mWIUIYgI.bat
<Current directory>\YAEy.exe
C:\RCXF.tmp
%TEMP%\guUgocsA.bat
C:\RCX11.tmp
<Current directory>\KqkM.ico
<Current directory>\AgUk.exe
C:\RCX10.tmp
<Current directory>\lCcI.ico
<Current directory>\DwYo.exe
<Current directory>\ncUM.ico
%TEMP%\OsIYUMwE.bat
<Current directory>\PUQo.ico
<Current directory>\sQEW.exe
%TEMP%\mMQMsIEM.bat
<Current directory>\wQIA.exe
C:\RCXC.tmp
<Current directory>\wQYs.ico
<Current directory>\WMoc.exe
C:\RCXE.tmp
C:\RCXD.tmp
%TEMP%\iqYIUAYg.bat
%TEMP%\WIwoEgYQ.bat
C:\RCX12.tmp
C:\RCX17.tmp
<Current directory>\JAwQ.ico
<Current directory>\dQYw.exe
C:\RCX16.tmp
<Current directory>\vWEs.ico
<Current directory>\vkMy.exe
C:\RCX19.tmp
<Current directory>\yKAM.ico
<Current directory>\jMkI.exe
C:\RCX18.tmp
<Current directory>\VkEI.ico
<Current directory>\YEAE.exe
<Current directory>\AUEo.exe
%TEMP%\EuooAoQc.bat
<Current directory>\MgEY.ico
<Current directory>\BIMk.exe
<Current directory>\bGgA.ico
<Current directory>\psUW.exe
C:\RCX13.tmp
C:\RCX15.tmp
%TEMP%\HUQcQkwE.bat
<Current directory>\VCYE.ico
C:\RCX14.tmp
<Current directory>\bEMI.ico
<Current directory>\Lwok.exe
C:\RCX2.tmp
<Current directory>\rqoI.ico
<Current directory>\nMcS.exe
%TEMP%\jeUEEgEw.bat
<Current directory>\DMkI.ico
<Current directory>\EcwS.exe
<Current directory>\awIs.ico
<Current directory>\uQgG.exe
C:\RCX4.tmp
%TEMP%\DKEcEsEY.bat
C:\RCX3.tmp
%TEMP%\kiUUIwMA.bat
%TEMP%\OkQgQgUg.bat
%ALLUSERSPROFILE%\casg.txt
C:\Documents and Settings\LocalService\NIMMEwsg\jaQEcQMQ
%TEMP%\hKMYkgsg.bat
%HOMEPATH%\NIMMEwsg\jaQEcQMQ
%ALLUSERSPROFILE%\vesswIQA\AcIcUcAM
%ALLUSERSPROFILE%\lwQggIEM\nwAEcgMA.exe
C:\RCX1.tmp
%TEMP%\csAIAEUI.bat
%TEMP%\file.vbs
<Current directory>\<Virus name>
<Current directory>\lMcY.ico
<Current directory>\pAsA.exe
<Current directory>\CssA.ico
<Current directory>\tQQE.ico
<Current directory>\OUMC.exe
%TEMP%\TiQkwUoM.bat
<Current directory>\RCkk.ico
<Current directory>\XAEC.exe
C:\RCX9.tmp
<Current directory>\bMIy.exe
C:\RCXB.tmp
<Current directory>\UMMY.ico
C:\RCXA.tmp
%TEMP%\PucsQQMQ.bat
<Current directory>\hakI.ico
%TEMP%\FkkEkAkg.bat
<Current directory>\xEAg.exe
C:\RCX6.tmp
<Current directory>\ieAU.ico
<Current directory>\NEcS.exe
C:\RCX5.tmp
<Current directory>\yqYQ.ico
<Current directory>\WwQc.ico
<Current directory>\jUMm.exe
C:\RCX8.tmp
<Current directory>\AksA.exe
%TEMP%\AqQoMkUc.bat
C:\RCX7.tmp

Deletes the following files:

<Current directory>\DwYo.exe
<Current directory>\AOcQ.ico
<Current directory>\zYok.exe
<Current directory>\lCcI.ico
<Current directory>\psUW.exe
<Current directory>\KqkM.ico
<Current directory>\AgUk.exe
<Current directory>\ncUM.ico
<Current directory>\PUQo.ico
<Current directory>\sQEW.exe
%TEMP%\iqYIUAYg.bat
<Current directory>\WMoc.exe
%TEMP%\guUgocsA.bat
<Current directory>\YAEy.exe
<Current directory>\wQYs.ico
<Current directory>\dQYw.exe
<Current directory>\vWEs.ico
<Current directory>\vkMy.exe
<Current directory>\JAwQ.ico
<Current directory>\yKAM.ico
<Current directory>\VkEI.ico
<Current directory>\YEAE.exe
<Current directory>\VCYE.ico
<Current directory>\BIMk.exe
%TEMP%\EuooAoQc.bat
<Current directory>\bGgA.ico
<Current directory>\MgEY.ico
<Current directory>\AUEo.exe
<Current directory>\bEMI.ico
<Current directory>\Lwok.exe
<Current directory>\awIs.ico
<Current directory>\uQgG.exe
<Current directory>\rqoI.ico
<Current directory>\NEcS.exe
<Current directory>\yqYQ.ico
<Current directory>\xEAg.exe
<Current directory>\CssA.ico
<Current directory>\nMcS.exe
<Current directory>\lMcY.ico
<Current directory>\pAsA.exe
%TEMP%\hKMYkgsg.bat
%TEMP%\OkQgQgUg.bat
%TEMP%\DKEcEsEY.bat
<Current directory>\DMkI.ico
<Current directory>\EcwS.exe
<Current directory>\bMIy.exe
<Current directory>\tQQE.ico
<Current directory>\OUMC.exe
<Current directory>\hakI.ico
<Current directory>\UMMY.ico
<Current directory>\wQIA.exe
%TEMP%\mMQMsIEM.bat
%TEMP%\TiQkwUoM.bat
<Current directory>\ieAU.ico
%TEMP%\AqQoMkUc.bat
<Current directory>\AksA.exe
<Current directory>\jUMm.exe
<Current directory>\RCkk.ico
<Current directory>\XAEC.exe
<Current directory>\WwQc.ico

Moves the following files:

from C:\RCX11.tmp to <Current directory>\DwYo.exe
from C:\RCX12.tmp to <Current directory>\AgUk.exe
from C:\RCX13.tmp to <Current directory>\psUW.exe
from C:\RCXE.tmp to <Current directory>\WMoc.exe
from C:\RCXF.tmp to <Current directory>\YAEy.exe
from C:\RCX10.tmp to <Current directory>\zYok.exe
from C:\RCX17.tmp to <Current directory>\vkMy.exe
from C:\RCX18.tmp to <Current directory>\dQYw.exe
from C:\RCX19.tmp to <Current directory>\YEAE.exe
from C:\RCX14.tmp to <Current directory>\BIMk.exe
from C:\RCX15.tmp to <Current directory>\Lwok.exe
from C:\RCX16.tmp to <Current directory>\AUEo.exe
from C:\RCXD.tmp to <Current directory>\sQEW.exe
from C:\RCX4.tmp to <Current directory>\uQgG.exe
from C:\RCX5.tmp to <Current directory>\NEcS.exe
from C:\RCX6.tmp to <Current directory>\xEAg.exe
from C:\RCX1.tmp to <Current directory>\pAsA.exe
from C:\RCX2.tmp to <Current directory>\EcwS.exe
from C:\RCX3.tmp to <Current directory>\nMcS.exe
from C:\RCXA.tmp to <Current directory>\OUMC.exe
from C:\RCXB.tmp to <Current directory>\bMIy.exe
from C:\RCXC.tmp to <Current directory>\wQIA.exe
from C:\RCX7.tmp to <Current directory>\AksA.exe
from C:\RCX8.tmp to <Current directory>\jUMm.exe
from C:\RCX9.tmp to <Current directory>\XAEC.exe

Network activity:

Connects to:

'74.##5.232.51':80

TCP:

HTTP GET requests:

74.##5.232.51/

UDP:

DNS ASK google.com

Miscellaneous:

Searches for the following windows:

ClassName: '' WindowName: 'jaQEcQMQ.exe'
ClassName: 'Shell_TrayWnd' WindowName: ''
ClassName: '' WindowName: 'Microsoft Windows'
ClassName: 'Indicator' WindowName: ''
ClassName: '' WindowName: 'AcIcUcAM.exe'

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