Trojan.DownLoader12.31801

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%\rCgIUYcU.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\AuMMMUAs.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\iIAQcUgo.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\HiEYgoMo.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\WOgUgwUA.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\TEwcoUcM.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\VGsUoYsk.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\OGcEYEMA.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%\aQEwAwAI.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\KoYAQEok.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\tEQEksQA.bat" "<Full path to virus>""
'<SYSTEM32>\cscript.exe' %TEMP%\file.vbs

Modifies file system :

Creates the following files:

<Current directory>\fcoE.ico
<Current directory>\bAIw.exe
C:\RCX13.tmp
C:\RCX12.tmp
C:\RCX11.tmp
<Current directory>\Rwso.ico
<Current directory>\qAAW.exe
<Current directory>\IYYA.exe
C:\RCX15.tmp
<Current directory>\MKkA.ico
<Current directory>\kUwc.ico
<Current directory>\hkAs.ico
<Current directory>\gYkK.exe
C:\RCX14.tmp
<Current directory>\WIIc.ico
<Current directory>\UYQo.exe
C:\RCXF.tmp
%TEMP%\AuMMMUAs.bat
<Current directory>\YCIU.ico
<Current directory>\WoQw.exe
C:\RCXE.tmp
<Current directory>\dOsg.ico
%TEMP%\rCgIUYcU.bat
<Current directory>\Zkog.exe
%TEMP%\QuYUoYQQ.bat
<Current directory>\dYsM.ico
<Current directory>\hYcA.exe
C:\RCX10.tmp
<Current directory>\KuQI.ico
<Current directory>\MsgA.exe
C:\RCX1B.tmp
C:\RCX1A.tmp
<Current directory>\KEYY.ico
<Current directory>\akMA.exe
%TEMP%\VGsUoYsk.bat
%TEMP%\WOgUgwUA.bat
<Current directory>\gAsO.exe
C:\RCX1C.tmp
<Current directory>\zCYc.ico
%TEMP%\likscIQg.bat
%TEMP%\TEwcoUcM.bat
%TEMP%\geIMccsM.bat
<Current directory>\PeYw.ico
<Current directory>\rMkU.exe
C:\RCX17.tmp
%TEMP%\HiEYgoMo.bat
<Current directory>\Bcga.exe
C:\RCX16.tmp
%TEMP%\GUYIUoIg.bat
<Current directory>\BAAm.exe
C:\RCX19.tmp
%TEMP%\IoAQggww.bat
<Current directory>\mQkY.ico
<Current directory>\KaEA.ico
<Current directory>\yEog.exe
C:\RCX18.tmp
%TEMP%\UCMUEIUM.bat
<Current directory>\FwUa.exe
C:\RCX3.tmp
%TEMP%\JuoAEIUw.bat
<Current directory>\RuEA.ico
%TEMP%\tEQEksQA.bat
<Current directory>\pAkK.exe
C:\RCX2.tmp
<Current directory>\hYok.ico
<Current directory>\hoUW.exe
C:\RCX5.tmp
%TEMP%\KoYAQEok.bat
<Current directory>\sCgs.ico
<Current directory>\FEUI.exe
C:\RCX4.tmp
C:\Documents and Settings\LocalService\NIMMEwsg\jaQEcQMQ
%TEMP%\UiUAIoEI.bat
<Current directory>\<Virus name>
%ALLUSERSPROFILE%\casg.txt
%HOMEPATH%\NIMMEwsg\jaQEcQMQ
%ALLUSERSPROFILE%\vesswIQA\AcIcUcAM
%ALLUSERSPROFILE%\lwQggIEM\nwAEcgMA.exe
%TEMP%\file.vbs
%TEMP%\fIoYEwYM.bat
<Current directory>\tEwE.ico
C:\RCX1.tmp
<Current directory>\tiQw.ico
%TEMP%\aQEwAwAI.bat
<Current directory>\BIAC.exe
<Current directory>\KecY.ico
<Current directory>\TIka.exe
C:\RCXB.tmp
%TEMP%\YcAYggoI.bat
<Current directory>\iWkY.ico
<Current directory>\RoEG.exe
C:\RCXA.tmp
<Current directory>\FQYk.ico
<Current directory>\rcAK.exe
C:\RCXD.tmp
C:\RCXC.tmp
%TEMP%\iIAQcUgo.bat
<Current directory>\nMgM.ico
<Current directory>\bEkM.exe
%TEMP%\OGcEYEMA.bat
<Current directory>\BEUQ.ico
<Current directory>\iwwa.exe
%TEMP%\luoMYkks.bat
<Current directory>\GgUs.ico
<Current directory>\jUwW.exe
C:\RCX6.tmp
<Current directory>\xqwk.ico
<Current directory>\VIsM.exe
C:\RCX9.tmp
C:\RCX8.tmp
C:\RCX7.tmp
<Current directory>\rOQc.ico
<Current directory>\hEAC.exe

Deletes the following files:

<Current directory>\bAIw.exe
<Current directory>\fcoE.ico
<Current directory>\qAAW.exe
<Current directory>\Rwso.ico
<Current directory>\IYYA.exe
<Current directory>\kUwc.ico
<Current directory>\gYkK.exe
<Current directory>\hkAs.ico
<Current directory>\WIIc.ico
%TEMP%\QuYUoYQQ.bat
<Current directory>\YCIU.ico
<Current directory>\UYQo.exe
<Current directory>\Zkog.exe
<Current directory>\dOsg.ico
<Current directory>\hYcA.exe
<Current directory>\dYsM.ico
<Current directory>\akMA.exe
<Current directory>\KEYY.ico
<Current directory>\mQkY.ico
%TEMP%\IoAQggww.bat
<Current directory>\KuQI.ico
%TEMP%\geIMccsM.bat
%TEMP%\likscIQg.bat
<Current directory>\MsgA.exe
<Current directory>\MKkA.ico
<Current directory>\rMkU.exe
%TEMP%\GUYIUoIg.bat
<Current directory>\Bcga.exe
<Current directory>\KaEA.ico
<Current directory>\BAAm.exe
<Current directory>\PeYw.ico
<Current directory>\yEog.exe
<Current directory>\WoQw.exe
<Current directory>\sCgs.ico
<Current directory>\hoUW.exe
%TEMP%\JuoAEIUw.bat
<Current directory>\FEUI.exe
<Current directory>\jUwW.exe
<Current directory>\GgUs.ico
<Current directory>\hYok.ico
%TEMP%\luoMYkks.bat
<Current directory>\tiQw.ico
%TEMP%\fIoYEwYM.bat
%TEMP%\UiUAIoEI.bat
<Current directory>\BIAC.exe
<Current directory>\FwUa.exe
<Current directory>\RuEA.ico
<Current directory>\pAkK.exe
<Current directory>\tEwE.ico
<Current directory>\KecY.ico
<Current directory>\bEkM.exe
<Current directory>\iWkY.ico
<Current directory>\TIka.exe
%TEMP%\UCMUEIUM.bat
<Current directory>\FQYk.ico
<Current directory>\nMgM.ico
<Current directory>\rcAK.exe
<Current directory>\hEAC.exe
<Current directory>\rOQc.ico
<Current directory>\iwwa.exe
<Current directory>\BEUQ.ico
<Current directory>\RoEG.exe
%TEMP%\YcAYggoI.bat
<Current directory>\VIsM.exe
<Current directory>\xqwk.ico

Moves the following files:

from C:\RCX12.tmp to <Current directory>\qAAW.exe
from C:\RCX13.tmp to <Current directory>\bAIw.exe
from C:\RCX14.tmp to <Current directory>\gYkK.exe
from C:\RCXF.tmp to <Current directory>\UYQo.exe
from C:\RCX10.tmp to <Current directory>\hYcA.exe
from C:\RCX11.tmp to <Current directory>\Zkog.exe
from C:\RCX15.tmp to <Current directory>\IYYA.exe
from C:\RCX19.tmp to <Current directory>\BAAm.exe
from C:\RCX1A.tmp to <Current directory>\akMA.exe
from C:\RCX1B.tmp to <Current directory>\MsgA.exe
from C:\RCX16.tmp to <Current directory>\Bcga.exe
from C:\RCX17.tmp to <Current directory>\rMkU.exe
from C:\RCX18.tmp to <Current directory>\yEog.exe
from C:\RCXE.tmp to <Current directory>\WoQw.exe
from C:\RCX4.tmp to <Current directory>\FEUI.exe
from C:\RCX5.tmp to <Current directory>\hoUW.exe
from C:\RCX6.tmp to <Current directory>\jUwW.exe
from C:\RCX1.tmp to <Current directory>\BIAC.exe
from C:\RCX2.tmp to <Current directory>\pAkK.exe
from C:\RCX3.tmp to <Current directory>\FwUa.exe
from C:\RCX7.tmp to <Current directory>\iwwa.exe
from C:\RCXB.tmp to <Current directory>\TIka.exe
from C:\RCXC.tmp to <Current directory>\bEkM.exe
from C:\RCXD.tmp to <Current directory>\rcAK.exe
from C:\RCX8.tmp to <Current directory>\hEAC.exe
from C:\RCX9.tmp to <Current directory>\VIsM.exe
from C:\RCXA.tmp to <Current directory>\RoEG.exe

Deletes itself.

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

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