Trojan.DownLoader12.31804

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%\qacYoksM.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\LOowAMEg.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\ZgUEYAEE.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\oSosQAsY.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\hqQUgwEE.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\LCcsEUoI.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\baMQsUUM.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%\qyIwgIsE.bat" "<Full path to virus>""
'<SYSTEM32>\cscript.exe' %TEMP%\file.vbs
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\lIsUgcIA.bat" "<Full path to virus>""

Modifies file system :

Creates the following files:

<Current directory>\SgQk.ico
<Current directory>\TQYS.exe
%TEMP%\ikoMwYkk.bat
<Current directory>\PQIQ.ico
<Current directory>\HYMo.exe
C:\RCX10.tmp
C:\RCX11.tmp
%TEMP%\hqQUgwEE.bat
<Current directory>\Vqwk.ico
<Current directory>\Hsku.exe
<Current directory>\aQMs.ico
<Current directory>\OgwU.exe
C:\RCX12.tmp
%TEMP%\LCcsEUoI.bat
<Current directory>\cqUs.ico
<Current directory>\dsQA.exe
<Current directory>\HSMI.ico
<Current directory>\QYoq.exe
C:\RCXC.tmp
C:\RCXD.tmp
<Current directory>\OYUM.ico
<Current directory>\dkUq.exe
C:\RCXF.tmp
<Current directory>\EMgc.ico
<Current directory>\wwAi.exe
C:\RCXE.tmp
C:\RCX13.tmp
<Current directory>\oIAU.ico
<Current directory>\BkMU.exe
C:\RCX19.tmp
<Current directory>\PQsg.ico
<Current directory>\PQou.exe
C:\RCX18.tmp
%TEMP%\oSosQAsY.bat
<Current directory>\eAQA.ico
<Current directory>\REAe.exe
C:\RCX1B.tmp
<Current directory>\KsQA.ico
<Current directory>\AogQ.exe
C:\RCX1A.tmp
<Current directory>\FUAg.ico
<Current directory>\HQcS.exe
C:\RCX15.tmp
<Current directory>\eykQ.ico
<Current directory>\mIMM.exe
C:\RCX14.tmp
<Current directory>\FcMk.ico
<Current directory>\fgsY.exe
C:\RCX17.tmp
%TEMP%\lqQUIcwc.bat
<Current directory>\BkIu.exe
C:\RCX16.tmp
<Current directory>\oyYo.ico
%TEMP%\baMQsUUM.bat
%TEMP%\FcwkIskQ.bat
%TEMP%\ZgUEYAEE.bat
%TEMP%\qyIwgIsE.bat
<Current directory>\oAwA.ico
%TEMP%\RMwswMIM.bat
<Current directory>\NUom.exe
<Current directory>\eMIA.ico
<Current directory>\nwEQ.exe
C:\RCX3.tmp
C:\RCX2.tmp
%TEMP%\csgAMckI.bat
%TEMP%\LOowAMEg.bat
%ALLUSERSPROFILE%\casg.txt
C:\Documents and Settings\LocalService\NIMMEwsg\jaQEcQMQ
%TEMP%\vYgIIUws.bat
%HOMEPATH%\NIMMEwsg\jaQEcQMQ
%ALLUSERSPROFILE%\vesswIQA\AcIcUcAM
%ALLUSERSPROFILE%\lwQggIEM\nwAEcgMA.exe
<Current directory>\<Virus name>
C:\RCX1.tmp
%TEMP%\file.vbs
%TEMP%\cmsooEUo.bat
<Current directory>\gAIY.ico
%TEMP%\lIsUgcIA.bat
<Current directory>\mQoW.exe
<Current directory>\gOkg.ico
<Current directory>\JSUY.ico
<Current directory>\lEQM.exe
C:\RCX9.tmp
<Current directory>\IqYo.ico
<Current directory>\ZIce.exe
C:\RCX8.tmp
<Current directory>\qCIg.ico
<Current directory>\qcAU.ico
<Current directory>\wEQI.exe
C:\RCXB.tmp
%TEMP%\sowsgkIk.bat
<Current directory>\OcYE.exe
C:\RCXA.tmp
%TEMP%\qacYoksM.bat
<Current directory>\lwMk.ico
<Current directory>\nsAa.exe
<Current directory>\nwQO.exe
%TEMP%\OWQUQAIs.bat
C:\RCX4.tmp
C:\RCX5.tmp
<Current directory>\gAEg.ico
<Current directory>\Kwks.exe
C:\RCX7.tmp
<Current directory>\LSgQ.ico
<Current directory>\xkQe.exe
C:\RCX6.tmp

Deletes the following files:

<Current directory>\OgwU.exe
<Current directory>\SgQk.ico
%TEMP%\ikoMwYkk.bat
<Current directory>\aQMs.ico
<Current directory>\mIMM.exe
<Current directory>\Vqwk.ico
<Current directory>\Hsku.exe
<Current directory>\TQYS.exe
<Current directory>\EMgc.ico
<Current directory>\wwAi.exe
<Current directory>\cqUs.ico
<Current directory>\dkUq.exe
<Current directory>\PQIQ.ico
<Current directory>\HYMo.exe
<Current directory>\OYUM.ico
<Current directory>\eykQ.ico
<Current directory>\oIAU.ico
<Current directory>\BkMU.exe
<Current directory>\PQsg.ico
<Current directory>\AogQ.exe
<Current directory>\eAQA.ico
<Current directory>\REAe.exe
<Current directory>\KsQA.ico
<Current directory>\PQou.exe
<Current directory>\BkIu.exe
<Current directory>\FUAg.ico
<Current directory>\HQcS.exe
<Current directory>\FcMk.ico
%TEMP%\lqQUIcwc.bat
<Current directory>\oyYo.ico
<Current directory>\fgsY.exe
<Current directory>\dsQA.exe
<Current directory>\eMIA.ico
<Current directory>\nwEQ.exe
<Current directory>\oAwA.ico
%TEMP%\OWQUQAIs.bat
<Current directory>\nsAa.exe
<Current directory>\gOkg.ico
<Current directory>\nwQO.exe
<Current directory>\NUom.exe
<Current directory>\gAIY.ico
<Current directory>\mQoW.exe
%TEMP%\vYgIIUws.bat
%TEMP%\cmsooEUo.bat
%TEMP%\csgAMckI.bat
%TEMP%\FcwkIskQ.bat
%TEMP%\RMwswMIM.bat
<Current directory>\lwMk.ico
%TEMP%\sowsgkIk.bat
<Current directory>\qCIg.ico
<Current directory>\OcYE.exe
<Current directory>\wEQI.exe
<Current directory>\HSMI.ico
<Current directory>\QYoq.exe
<Current directory>\qcAU.ico
<Current directory>\JSUY.ico
<Current directory>\Kwks.exe
<Current directory>\LSgQ.ico
<Current directory>\xkQe.exe
<Current directory>\gAEg.ico
<Current directory>\lEQM.exe
<Current directory>\IqYo.ico
<Current directory>\ZIce.exe

Moves the following files:

from C:\RCX12.tmp to <Current directory>\OgwU.exe
from C:\RCX13.tmp to <Current directory>\Hsku.exe
from C:\RCX14.tmp to <Current directory>\mIMM.exe
from C:\RCXF.tmp to <Current directory>\dkUq.exe
from C:\RCX10.tmp to <Current directory>\HYMo.exe
from C:\RCX11.tmp to <Current directory>\TQYS.exe
from C:\RCX15.tmp to <Current directory>\HQcS.exe
from C:\RCX19.tmp to <Current directory>\BkMU.exe
from C:\RCX1A.tmp to <Current directory>\AogQ.exe
from C:\RCX1B.tmp to <Current directory>\REAe.exe
from C:\RCX16.tmp to <Current directory>\BkIu.exe
from C:\RCX17.tmp to <Current directory>\fgsY.exe
from C:\RCX18.tmp to <Current directory>\PQou.exe
from C:\RCXE.tmp to <Current directory>\wwAi.exe
from C:\RCX4.tmp to <Current directory>\nwQO.exe
from C:\RCX5.tmp to <Current directory>\nsAa.exe
from C:\RCX6.tmp to <Current directory>\xkQe.exe
from C:\RCX1.tmp to <Current directory>\mQoW.exe
from C:\RCX2.tmp to <Current directory>\NUom.exe
from C:\RCX3.tmp to <Current directory>\nwEQ.exe
from C:\RCX7.tmp to <Current directory>\Kwks.exe
from C:\RCXB.tmp to <Current directory>\wEQI.exe
from C:\RCXC.tmp to <Current directory>\QYoq.exe
from C:\RCXD.tmp to <Current directory>\dsQA.exe
from C:\RCX8.tmp to <Current directory>\ZIce.exe
from C:\RCX9.tmp to <Current directory>\lEQM.exe
from C:\RCXA.tmp to <Current directory>\OcYE.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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