Trojan.DownLoader12.26730

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%\pYggwEQk.bat" "<Full path to virus>""
'<SYSTEM32>\cscript.exe' %TEMP%\file.vbs
'<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 HideFileExt /t REG_DWORD /d 1
'<SYSTEM32>\reg.exe' add HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced /f /v Hidden /t REG_DWORD /d 2

Modifies file system :

Creates the following files:

C:\RCX15.tmp
<Current directory>\GqcQ.ico
<Current directory>\ksMS.exe
C:\RCX14.tmp
<Current directory>\eewk.ico
<Current directory>\acYg.exe
C:\RCX16.tmp
<Current directory>\vwkA.ico
<Current directory>\ZUYS.exe
C:\RCX18.tmp
<Current directory>\hkMA.ico
<Current directory>\PEQg.exe
C:\RCX17.tmp
<Current directory>\CEAE.exe
C:\RCX11.tmp
<Current directory>\pKIY.ico
<Current directory>\fwsG.exe
C:\RCX10.tmp
<Current directory>\VYck.ico
<Current directory>\ucwM.exe
C:\RCX13.tmp
<Current directory>\AYws.ico
<Current directory>\rksK.exe
C:\RCX12.tmp
<Current directory>\Wcgc.ico
<Current directory>\KYYY.exe
<Current directory>\ZOcM.ico
C:\RCX1D.tmp
<Current directory>\tIsc.ico
<Current directory>\FsMQ.exe
C:\RCX1C.tmp
<Current directory>\FWww.ico
<Current directory>\nIkM.exe
C:\RCX1E.tmp
<Current directory>\UQQE.ico
<Current directory>\ecAG.exe
C:\RCX20.tmp
<Current directory>\jaYw.ico
<Current directory>\WYQe.exe
C:\RCX1F.tmp
<Current directory>\SUUO.exe
C:\RCX1A.tmp
%TEMP%\VkowIYQA.bat
<Current directory>\BEgM.exe
C:\RCX19.tmp
<Current directory>\cOUo.ico
%TEMP%\pYggwEQk.bat
C:\RCX1B.tmp
<Current directory>\cYkc.ico
<Current directory>\Tgsc.exe
%TEMP%\file.vbs
<Current directory>\feAM.ico
<Current directory>\Bcwo.exe
<Current directory>\HKAM.ico
<Current directory>\Iooi.exe
C:\RCX4.tmp
<Current directory>\CAUQ.ico
<Current directory>\WgEy.exe
C:\RCX3.tmp
<Current directory>\fwUg.ico
<Current directory>\RIIa.exe
C:\RCX6.tmp
<Current directory>\eyAE.ico
<Current directory>\zUwc.exe
C:\RCX5.tmp
<Current directory>\yuQQ.ico
C:\Documents and Settings\LocalService\NIMMEwsg\jaQEcQMQ
%ALLUSERSPROFILE%\casg.txt
%TEMP%\reEsAMow.bat
%HOMEPATH%\NIMMEwsg\jaQEcQMQ
%ALLUSERSPROFILE%\vesswIQA\AcIcUcAM
%ALLUSERSPROFILE%\lwQggIEM\nwAEcgMA.exe
<Current directory>\<Virus name>
<Current directory>\Qqws.ico
<Current directory>\aIUq.exe
C:\RCX2.tmp
<Current directory>\gYQs.ico
<Current directory>\YUUm.exe
C:\RCX1.tmp
<Current directory>\EMoE.exe
<Current directory>\ygcI.ico
<Current directory>\wIUO.exe
C:\RCXD.tmp
<Current directory>\iGog.ico
<Current directory>\AIwC.exe
C:\RCXC.tmp
<Current directory>\AOcE.ico
<Current directory>\AAUk.exe
C:\RCXF.tmp
<Current directory>\rskY.ico
<Current directory>\KgoS.exe
C:\RCXE.tmp
<Current directory>\VGgs.ico
C:\RCX8.tmp
<Current directory>\NUYo.ico
<Current directory>\bokM.exe
C:\RCX7.tmp
<Current directory>\qGAs.ico
<Current directory>\FokO.exe
C:\RCX9.tmp
<Current directory>\OEQo.ico
<Current directory>\QckE.exe
C:\RCXB.tmp
<Current directory>\EwoA.ico
<Current directory>\xMwy.exe
C:\RCXA.tmp

Deletes the following files:

<Current directory>\eewk.ico
<Current directory>\ksMS.exe
<Current directory>\AYws.ico
<Current directory>\acYg.exe
<Current directory>\hkMA.ico
<Current directory>\ZUYS.exe
<Current directory>\GqcQ.ico
<Current directory>\PEQg.exe
<Current directory>\VYck.ico
<Current directory>\ucwM.exe
<Current directory>\rskY.ico
<Current directory>\CEAE.exe
<Current directory>\Wcgc.ico
<Current directory>\rksK.exe
<Current directory>\pKIY.ico
<Current directory>\KYYY.exe
<Current directory>\nIkM.exe
<Current directory>\FWww.ico
<Current directory>\Tgsc.exe
<Current directory>\cYkc.ico
<Current directory>\WYQe.exe
<Current directory>\jaYw.ico
<Current directory>\FsMQ.exe
<Current directory>\tIsc.ico
<Current directory>\ZOcM.ico
%TEMP%\VkowIYQA.bat
<Current directory>\vwkA.ico
<Current directory>\BEgM.exe
<Current directory>\Bcwo.exe
<Current directory>\feAM.ico
<Current directory>\SUUO.exe
<Current directory>\cOUo.ico
<Current directory>\fwUg.ico
<Current directory>\RIIa.exe
<Current directory>\HKAM.ico
<Current directory>\zUwc.exe
<Current directory>\eyAE.ico
<Current directory>\FokO.exe
<Current directory>\yuQQ.ico
<Current directory>\EMoE.exe
<Current directory>\gYQs.ico
<Current directory>\aIUq.exe
%TEMP%\reEsAMow.bat
<Current directory>\YUUm.exe
<Current directory>\CAUQ.ico
<Current directory>\Iooi.exe
<Current directory>\Qqws.ico
<Current directory>\WgEy.exe
<Current directory>\ygcI.ico
<Current directory>\KgoS.exe
<Current directory>\iGog.ico
<Current directory>\wIUO.exe
<Current directory>\VGgs.ico
<Current directory>\fwsG.exe
<Current directory>\AOcE.ico
<Current directory>\AAUk.exe
<Current directory>\NUYo.ico
<Current directory>\xMwy.exe
<Current directory>\qGAs.ico
<Current directory>\bokM.exe
<Current directory>\OEQo.ico
<Current directory>\AIwC.exe
<Current directory>\EwoA.ico
<Current directory>\QckE.exe

Moves the following files:

from C:\RCX15.tmp to <Current directory>\acYg.exe
from C:\RCX16.tmp to <Current directory>\ksMS.exe
from C:\RCX17.tmp to <Current directory>\PEQg.exe
from C:\RCX14.tmp to <Current directory>\rksK.exe
from C:\RCX11.tmp to <Current directory>\CEAE.exe
from C:\RCX12.tmp to <Current directory>\ucwM.exe
from C:\RCX13.tmp to <Current directory>\KYYY.exe
from C:\RCX18.tmp to <Current directory>\ZUYS.exe
from C:\RCX1D.tmp to <Current directory>\nIkM.exe
from C:\RCX1E.tmp to <Current directory>\FsMQ.exe
from C:\RCX1F.tmp to <Current directory>\WYQe.exe
from C:\RCX1C.tmp to <Current directory>\Tgsc.exe
from C:\RCX19.tmp to <Current directory>\BEgM.exe
from C:\RCX1A.tmp to <Current directory>\SUUO.exe
from C:\RCX1B.tmp to <Current directory>\Bcwo.exe
from C:\RCX10.tmp to <Current directory>\fwsG.exe
from C:\RCX5.tmp to <Current directory>\zUwc.exe
from C:\RCX6.tmp to <Current directory>\RIIa.exe
from C:\RCX7.tmp to <Current directory>\EMoE.exe
from C:\RCX4.tmp to <Current directory>\Iooi.exe
from C:\RCX1.tmp to <Current directory>\YUUm.exe
from C:\RCX2.tmp to <Current directory>\aIUq.exe
from C:\RCX3.tmp to <Current directory>\WgEy.exe
from C:\RCX8.tmp to <Current directory>\FokO.exe
from C:\RCXD.tmp to <Current directory>\wIUO.exe
from C:\RCXE.tmp to <Current directory>\KgoS.exe
from C:\RCXF.tmp to <Current directory>\AAUk.exe
from C:\RCXC.tmp to <Current directory>\AIwC.exe
from C:\RCX9.tmp to <Current directory>\bokM.exe
from C:\RCXA.tmp to <Current directory>\xMwy.exe
from C:\RCXB.tmp to <Current directory>\QckE.exe

Network activity:

Connects to:

'bl##k.io':443

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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