Trojan.DownLoader12.31788

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%\CEIcwoEA.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\SIIEIoUA.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\KScMgssg.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\uQwQUYUg.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\hgowAgAI.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\xqEkwgUI.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\QaIMEcIQ.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%\NUkkgIoI.bat" "<Full path to virus>""
'<SYSTEM32>\cscript.exe' %TEMP%\file.vbs
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\XYoIcAIc.bat" "<Full path to virus>""

Modifies file system :

Creates the following files:

<Current directory>\iGgk.ico
<Current directory>\MsEw.exe
C:\RCX10.tmp
<Current directory>\Sgci.exe
C:\RCXF.tmp
%TEMP%\nggosMkQ.bat
C:\RCX11.tmp
%TEMP%\kUIIEEcA.bat
%TEMP%\uQwQUYUg.bat
%TEMP%\hgowAgAI.bat
<Current directory>\noQQ.ico
<Current directory>\EsYw.exe
<Current directory>\sScg.ico
%TEMP%\CEIcwoEA.bat
<Current directory>\TuwI.ico
<Current directory>\AIsu.exe
<Current directory>\SUMM.exe
C:\RCXC.tmp
%TEMP%\AegAIYUc.bat
%TEMP%\awYcYwIc.bat
C:\RCXE.tmp
%TEMP%\xqEkwgUI.bat
C:\RCXD.tmp
<Current directory>\fQQo.ico
<Current directory>\tkwq.exe
<Current directory>\TmEE.ico
<Current directory>\UYAM.exe
C:\RCX17.tmp
<Current directory>\LCkI.ico
<Current directory>\fYEO.exe
C:\RCX16.tmp
<Current directory>\FUcw.ico
<Current directory>\BAAm.exe
C:\RCX19.tmp
<Current directory>\TsYE.ico
<Current directory>\lUIy.exe
C:\RCX18.tmp
C:\RCX15.tmp
<Current directory>\uGQk.ico
<Current directory>\AMEo.exe
C:\RCX13.tmp
<Current directory>\hiQg.ico
<Current directory>\dEAG.exe
C:\RCX12.tmp
C:\RCX14.tmp
<Current directory>\oUsY.ico
<Current directory>\CUwq.exe
%TEMP%\icEogoME.bat
<Current directory>\AQgM.ico
<Current directory>\KYIQ.exe
<Current directory>\HWYA.ico
%TEMP%\QaIMEcIQ.bat
<Current directory>\EQka.exe
C:\RCX2.tmp
<Current directory>\RacA.ico
%TEMP%\NUkkgIoI.bat
%TEMP%\JSwsoAsI.bat
<Current directory>\naUo.ico
<Current directory>\Fkki.exe
C:\RCX4.tmp
<Current directory>\zQYU.ico
<Current directory>\hUEG.exe
C:\RCX3.tmp
%TEMP%\SqcUMQQI.bat
%ALLUSERSPROFILE%\casg.txt
C:\Documents and Settings\LocalService\NIMMEwsg\jaQEcQMQ
%TEMP%\vEUcEsgI.bat
%HOMEPATH%\NIMMEwsg\jaQEcQMQ
%ALLUSERSPROFILE%\vesswIQA\AcIcUcAM
%ALLUSERSPROFILE%\lwQggIEM\nwAEcgMA.exe
%TEMP%\XYoIcAIc.bat
C:\RCX1.tmp
%TEMP%\file.vbs
<Current directory>\<Virus name>
<Current directory>\xwAQ.ico
<Current directory>\ZcMW.exe
C:\RCX9.tmp
%TEMP%\BEAgosEI.bat
<Current directory>\PiYM.ico
C:\RCX8.tmp
<Current directory>\BUgE.ico
<Current directory>\pgwu.exe
<Current directory>\IawE.ico
<Current directory>\WoYQ.exe
C:\RCXB.tmp
<Current directory>\BwUA.exe
C:\RCXA.tmp
%TEMP%\SIIEIoUA.bat
<Current directory>\wkkU.exe
<Current directory>\CQow.ico
%TEMP%\BYEIocYU.bat
<Current directory>\GgUq.exe
<Current directory>\gygw.ico
<Current directory>\Swgo.exe
C:\RCX5.tmp
C:\RCX7.tmp
<Current directory>\MAUY.ico
%TEMP%\KScMgssg.bat
C:\RCX6.tmp
<Current directory>\zqAQ.ico
<Current directory>\PEsQ.exe

Deletes the following files:

%TEMP%\kUIIEEcA.bat
<Current directory>\iGgk.ico
<Current directory>\MsEw.exe
<Current directory>\EsYw.exe
<Current directory>\hiQg.ico
<Current directory>\dEAG.exe
<Current directory>\noQQ.ico
%TEMP%\nggosMkQ.bat
%TEMP%\awYcYwIc.bat
<Current directory>\TuwI.ico
<Current directory>\AIsu.exe
<Current directory>\tkwq.exe
<Current directory>\sScg.ico
<Current directory>\Sgci.exe
<Current directory>\fQQo.ico
<Current directory>\TmEE.ico
<Current directory>\UYAM.exe
<Current directory>\LCkI.ico
<Current directory>\lUIy.exe
<Current directory>\FUcw.ico
<Current directory>\BAAm.exe
<Current directory>\TsYE.ico
<Current directory>\fYEO.exe
<Current directory>\uGQk.ico
%TEMP%\icEogoME.bat
<Current directory>\AMEo.exe
<Current directory>\KYIQ.exe
<Current directory>\oUsY.ico
<Current directory>\CUwq.exe
<Current directory>\AQgM.ico
<Current directory>\naUo.ico
<Current directory>\Fkki.exe
<Current directory>\zQYU.ico
<Current directory>\Swgo.exe
<Current directory>\GgUq.exe
%TEMP%\BYEIocYU.bat
<Current directory>\gygw.ico
<Current directory>\hUEG.exe
<Current directory>\xwAQ.ico
<Current directory>\ZcMW.exe
%TEMP%\vEUcEsgI.bat
%TEMP%\SqcUMQQI.bat
<Current directory>\RacA.ico
<Current directory>\EQka.exe
%TEMP%\JSwsoAsI.bat
<Current directory>\WoYQ.exe
<Current directory>\PiYM.ico
<Current directory>\BwUA.exe
<Current directory>\IawE.ico
<Current directory>\HWYA.ico
<Current directory>\SUMM.exe
%TEMP%\AegAIYUc.bat
%TEMP%\BEAgosEI.bat
<Current directory>\zqAQ.ico
<Current directory>\PEsQ.exe
<Current directory>\CQow.ico
<Current directory>\wkkU.exe
<Current directory>\BUgE.ico
<Current directory>\pgwu.exe
<Current directory>\MAUY.ico

Moves the following files:

from C:\RCX11.tmp to <Current directory>\EsYw.exe
from C:\RCX12.tmp to <Current directory>\dEAG.exe
from C:\RCX13.tmp to <Current directory>\AMEo.exe
from C:\RCXE.tmp to <Current directory>\tkwq.exe
from C:\RCXF.tmp to <Current directory>\Sgci.exe
from C:\RCX10.tmp to <Current directory>\MsEw.exe
from C:\RCX17.tmp to <Current directory>\UYAM.exe
from C:\RCX18.tmp to <Current directory>\lUIy.exe
from C:\RCX19.tmp to <Current directory>\BAAm.exe
from C:\RCX14.tmp to <Current directory>\KYIQ.exe
from C:\RCX15.tmp to <Current directory>\CUwq.exe
from C:\RCX16.tmp to <Current directory>\fYEO.exe
from C:\RCXD.tmp to <Current directory>\AIsu.exe
from C:\RCX4.tmp to <Current directory>\Fkki.exe
from C:\RCX5.tmp to <Current directory>\Swgo.exe
from C:\RCX6.tmp to <Current directory>\GgUq.exe
from C:\RCX1.tmp to <Current directory>\ZcMW.exe
from C:\RCX2.tmp to <Current directory>\EQka.exe
from C:\RCX3.tmp to <Current directory>\hUEG.exe
from C:\RCXA.tmp to <Current directory>\BwUA.exe
from C:\RCXB.tmp to <Current directory>\WoYQ.exe
from C:\RCXC.tmp to <Current directory>\SUMM.exe
from C:\RCX7.tmp to <Current directory>\PEsQ.exe
from C:\RCX8.tmp to <Current directory>\wkkU.exe
from C:\RCX9.tmp to <Current directory>\pgwu.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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