Trojan.DownLoader12.25128

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%\AksgkQgI.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\WIssgsQM.bat" "<Full path to virus>""
'<SYSTEM32>\wbem\wmiadap.exe' /R /T
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\bwAMIYQc.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\BSsYoIQo.bat" "<Full path to virus>""
'<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>\reg.exe' add HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /d 0 /t REG_DWORD /f
'<SYSTEM32>\cscript.exe' %TEMP%\file.vbs
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\JWQUkwkk.bat" "<Full path to virus>""

Modifies file system :

Creates the following files:

C:\RCX12.tmp
<Current directory>\Gyok.ico
<Current directory>\MkAy.exe
C:\RCX11.tmp
<Current directory>\TQQE.ico
<Current directory>\goUW.exe
<Current directory>\wQEg.ico
<Current directory>\FsgA.exe
C:\RCX14.tmp
%TEMP%\ieQAYIMc.bat
C:\RCX13.tmp
%TEMP%\BSsYoIQo.bat
<Current directory>\soQs.exe
C:\RCXE.tmp
%TEMP%\AksgkQgI.bat
<Current directory>\CIkM.ico
%TEMP%\CEMAoYMs.bat
<Current directory>\nkYA.ico
<Current directory>\bcgo.exe
<Current directory>\ucEi.exe
C:\RCX10.tmp
<Current directory>\RMMw.ico
<Current directory>\bMsK.exe
C:\RCXF.tmp
<Current directory>\tIow.ico
<Current directory>\Euog.ico
C:\RCX1A.tmp
%TEMP%\EWMwMgkc.bat
<Current directory>\DWAA.ico
C:\RCX19.tmp
<Current directory>\nKgE.ico
<Current directory>\jYUq.exe
%TEMP%\bwAMIYQc.bat
<Current directory>\mkgA.exe
C:\RCX1C.tmp
<Current directory>\KYsU.exe
C:\RCX1B.tmp
<Current directory>\fSUk.ico
<Current directory>\FAUk.exe
<Current directory>\ZAge.exe
C:\RCX16.tmp
<Current directory>\uWcs.ico
<Current directory>\XYIo.exe
C:\RCX15.tmp
<Current directory>\yOIM.ico
<Current directory>\DEsu.exe
C:\RCX18.tmp
<Current directory>\PYAg.ico
<Current directory>\AYgS.exe
C:\RCX17.tmp
<Current directory>\xGgc.ico
<Current directory>\MSwo.ico
<Current directory>\PkUI.exe
C:\RCX4.tmp
<Current directory>\Jsgw.ico
<Current directory>\xgMo.exe
C:\RCX3.tmp
C:\RCX5.tmp
%TEMP%\JWQUkwkk.bat
<Current directory>\pqwc.ico
<Current directory>\Rsgk.ico
%TEMP%\JOgAQEco.bat
<Current directory>\gEgm.exe
C:\RCX2.tmp
C:\Documents and Settings\LocalService\NIMMEwsg\jaQEcQMQ
%ALLUSERSPROFILE%\casg.txt
<Current directory>\iMso.ico
%HOMEPATH%\NIMMEwsg\jaQEcQMQ
%ALLUSERSPROFILE%\vesswIQA\AcIcUcAM
%ALLUSERSPROFILE%\lwQggIEM\nwAEcgMA.exe
C:\RCX1.tmp
<Current directory>\agcg.ico
<Current directory>\QkAm.exe
%TEMP%\zmssIIgk.bat
<Current directory>\<Virus name>
<Current directory>\DYsA.exe
%TEMP%\file.vbs
<Current directory>\qAgu.exe
C:\RCXB.tmp
%TEMP%\WIssgsQM.bat
<Current directory>\oIUS.exe
C:\RCXA.tmp
<Current directory>\Eoos.ico
<Current directory>\MyII.ico
<Current directory>\roUG.exe
C:\RCXD.tmp
<Current directory>\USkM.ico
<Current directory>\ywUQ.exe
C:\RCXC.tmp
%TEMP%\LuAIYYMw.bat
<Current directory>\Xgwo.exe
C:\RCX7.tmp
<Current directory>\LoEI.ico
<Current directory>\Jswu.exe
C:\RCX6.tmp
<Current directory>\gAQI.ico
<Current directory>\cMMo.exe
C:\RCX9.tmp
<Current directory>\ggQo.ico
<Current directory>\bkQk.exe
C:\RCX8.tmp
<Current directory>\VKow.ico

Deletes the following files:

<Current directory>\MkAy.exe
%TEMP%\ieQAYIMc.bat
<Current directory>\TQQE.ico
<Current directory>\Gyok.ico
<Current directory>\XYIo.exe
<Current directory>\wQEg.ico
<Current directory>\FsgA.exe
<Current directory>\goUW.exe
<Current directory>\CIkM.ico
<Current directory>\bMsK.exe
<Current directory>\nkYA.ico
<Current directory>\ucEi.exe
<Current directory>\RMMw.ico
<Current directory>\soQs.exe
<Current directory>\tIow.ico
<Current directory>\nKgE.ico
<Current directory>\jYUq.exe
<Current directory>\PYAg.ico
%TEMP%\EWMwMgkc.bat
<Current directory>\mkgA.exe
<Current directory>\DWAA.ico
<Current directory>\KYsU.exe
<Current directory>\FAUk.exe
<Current directory>\yOIM.ico
<Current directory>\ZAge.exe
<Current directory>\Euog.ico
<Current directory>\AYgS.exe
<Current directory>\xGgc.ico
<Current directory>\DEsu.exe
<Current directory>\uWcs.ico
<Current directory>\bcgo.exe
<Current directory>\gEgm.exe
%TEMP%\JOgAQEco.bat
<Current directory>\MSwo.ico
<Current directory>\Rsgk.ico
<Current directory>\Xgwo.exe
<Current directory>\pqwc.ico
<Current directory>\Jswu.exe
<Current directory>\PkUI.exe
<Current directory>\iMso.ico
<Current directory>\DYsA.exe
%TEMP%\zmssIIgk.bat
<Current directory>\QkAm.exe
<Current directory>\Jsgw.ico
<Current directory>\xgMo.exe
<Current directory>\agcg.ico
<Current directory>\ywUQ.exe
<Current directory>\Eoos.ico
<Current directory>\qAgu.exe
<Current directory>\USkM.ico
%TEMP%\CEMAoYMs.bat
<Current directory>\MyII.ico
<Current directory>\roUG.exe
<Current directory>\ggQo.ico
<Current directory>\LoEI.ico
<Current directory>\bkQk.exe
<Current directory>\gAQI.ico
<Current directory>\cMMo.exe
<Current directory>\oIUS.exe
%TEMP%\LuAIYYMw.bat
<Current directory>\VKow.ico

Moves the following files:

from C:\RCX13.tmp to <Current directory>\MkAy.exe
from C:\RCX14.tmp to <Current directory>\FsgA.exe
from C:\RCX15.tmp to <Current directory>\XYIo.exe
from C:\RCX12.tmp to <Current directory>\goUW.exe
from C:\RCXF.tmp to <Current directory>\bMsK.exe
from C:\RCX10.tmp to <Current directory>\ucEi.exe
from C:\RCX11.tmp to <Current directory>\soQs.exe
from C:\RCX1A.tmp to <Current directory>\jYUq.exe
from C:\RCX1B.tmp to <Current directory>\KYsU.exe
from C:\RCX1C.tmp to <Current directory>\mkgA.exe
from C:\RCX19.tmp to <Current directory>\FAUk.exe
from C:\RCX16.tmp to <Current directory>\ZAge.exe
from C:\RCX17.tmp to <Current directory>\AYgS.exe
from C:\RCX18.tmp to <Current directory>\DEsu.exe
from C:\RCX5.tmp to <Current directory>\gEgm.exe
from C:\RCX6.tmp to <Current directory>\Jswu.exe
from C:\RCX7.tmp to <Current directory>\Xgwo.exe
from C:\RCX4.tmp to <Current directory>\PkUI.exe
from C:\RCX1.tmp to <Current directory>\DYsA.exe
from C:\RCX2.tmp to <Current directory>\QkAm.exe
from C:\RCX3.tmp to <Current directory>\xgMo.exe
from C:\RCXC.tmp to <Current directory>\ywUQ.exe
from C:\RCXD.tmp to <Current directory>\roUG.exe
from C:\RCXE.tmp to <Current directory>\bcgo.exe
from C:\RCXB.tmp to <Current directory>\qAgu.exe
from C:\RCX8.tmp to <Current directory>\bkQk.exe
from C:\RCX9.tmp to <Current directory>\cMMo.exe
from C:\RCXA.tmp to <Current directory>\oIUS.exe

Network activity:

Connects to:

'74.##5.232.51':80
'bl##k.io':443

TCP:

HTTP GET requests:

74.##5.232.51/

UDP:

DNS ASK google.com
DNS ASK bl##k.io

Miscellaneous:

Searches for the following windows:

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

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