Trojan.DownLoader12.31798

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%\tQkwsUws.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\rCsoYUsk.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\LmEIUokw.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\JQYkckUQ.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\cgEEAckY.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\tyoAAIII.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\VoAUEIIE.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\GwQMgAkc.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>\cmd.exe' /c ""%TEMP%\aCgUIkUY.bat" "<Full path to virus>""
'<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
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\bOQEIwoY.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\pIEMgEcE.bat" "<Full path to virus>""
'<SYSTEM32>\cscript.exe' %TEMP%\file.vbs
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\kmkYUkgk.bat" "<Full path to virus>""

Modifies file system :

Creates the following files:

%TEMP%\VoAUEIIE.bat
<Current directory>\Ygks.ico
<Current directory>\ngIW.exe
C:\RCX13.tmp
%TEMP%\GegocIwU.bat
<Current directory>\OCsk.ico
<Current directory>\VUku.exe
C:\RCX14.tmp
<Current directory>\DQQy.exe
C:\RCX16.tmp
<Current directory>\wsIw.ico
<Current directory>\iOgc.ico
<Current directory>\lWQw.ico
<Current directory>\jgUo.exe
C:\RCX15.tmp
%TEMP%\piAYcsUs.bat
<Current directory>\YSkE.ico
<Current directory>\dwAO.exe
C:\RCXF.tmp
C:\RCXE.tmp
<Current directory>\zAwg.ico
<Current directory>\mwgg.exe
C:\RCX10.tmp
<Current directory>\HMww.ico
<Current directory>\KEAs.exe
C:\RCX12.tmp
C:\RCX11.tmp
%TEMP%\rCsoYUsk.bat
<Current directory>\bkoE.ico
<Current directory>\vckI.exe
<Current directory>\DsAC.exe
<Current directory>\icAc.ico
<Current directory>\RoAq.exe
C:\RCX1C.tmp
%TEMP%\tyoAAIII.bat
<Current directory>\ycMM.exe
C:\RCX1B.tmp
%TEMP%\vkggwoMM.bat
<Current directory>\TUMM.ico
C:\RCX1E.tmp
<Current directory>\kiwM.ico
<Current directory>\gkss.exe
<Current directory>\ZUUm.exe
<Current directory>\lwES.exe
C:\RCX1D.tmp
<Current directory>\CEkA.ico
C:\RCX18.tmp
%TEMP%\GwQMgAkc.bat
<Current directory>\HokA.ico
<Current directory>\VYku.exe
C:\RCX17.tmp
%TEMP%\WMsMUAgc.bat
<Current directory>\IcQE.ico
<Current directory>\towe.exe
C:\RCX1A.tmp
%TEMP%\cgEEAckY.bat
<Current directory>\SWEM.ico
%TEMP%\zsAcAEIQ.bat
C:\RCX19.tmp
<Current directory>\oiEI.ico
<Current directory>\zUEy.exe
<Current directory>\PYIE.exe
C:\RCX3.tmp
%TEMP%\vusAIsww.bat
<Current directory>\teok.ico
<Current directory>\YgAK.exe
C:\RCX2.tmp
%TEMP%\kmkYUkgk.bat
<Current directory>\kqoA.ico
<Current directory>\hwwq.exe
C:\RCX5.tmp
%TEMP%\IwYMIAgQ.bat
<Current directory>\RKUs.ico
<Current directory>\LccG.exe
C:\RCX4.tmp
%TEMP%\bOQEIwoY.bat
<Current directory>\xIoU.ico
C:\Documents and Settings\LocalService\NIMMEwsg\jaQEcQMQ
%TEMP%\VeckAUkw.bat
<Current directory>\<Virus name>
%ALLUSERSPROFILE%\casg.txt
%HOMEPATH%\NIMMEwsg\jaQEcQMQ
%ALLUSERSPROFILE%\vesswIQA\AcIcUcAM
%ALLUSERSPROFILE%\lwQggIEM\nwAEcgMA.exe
<Current directory>\vggM.ico
%TEMP%\CuQocgsw.bat
<Current directory>\GUgc.ico
<Current directory>\IgIS.exe
%TEMP%\file.vbs
<Current directory>\iEkO.exe
%TEMP%\aCgUIkUY.bat
C:\RCX1.tmp
<Current directory>\ZcwO.exe
<Current directory>\kcAW.exe
C:\RCXB.tmp
<Current directory>\fyIo.ico
<Current directory>\nwkY.ico
%TEMP%\JQYkckUQ.bat
<Current directory>\HkcQ.exe
C:\RCXA.tmp
<Current directory>\sEAq.exe
<Current directory>\fAkk.exe
C:\RCXD.tmp
<Current directory>\MikQ.ico
%TEMP%\tQkwsUws.bat
%TEMP%\zSYgwooE.bat
C:\RCXC.tmp
<Current directory>\HEwM.ico
<Current directory>\NAgc.ico
<Current directory>\JMkC.exe
C:\RCX7.tmp
%TEMP%\LmEIUokw.bat
%TEMP%\pIEMgEcE.bat
C:\RCX6.tmp
%TEMP%\RmMcswIs.bat
<Current directory>\dswo.ico
C:\RCX9.tmp
%TEMP%\BIYcAEgA.bat
<Current directory>\QkYw.ico
<Current directory>\NkEk.exe
<Current directory>\WEoU.exe
C:\RCX8.tmp
<Current directory>\mGkU.ico

Deletes the following files:

<Current directory>\ngIW.exe
<Current directory>\Ygks.ico
<Current directory>\VUku.exe
<Current directory>\OCsk.ico
<Current directory>\jgUo.exe
<Current directory>\iOgc.ico
<Current directory>\DsAC.exe
<Current directory>\lWQw.ico
<Current directory>\DQQy.exe
<Current directory>\dwAO.exe
<Current directory>\YSkE.ico
<Current directory>\zAwg.ico
%TEMP%\piAYcsUs.bat
<Current directory>\vckI.exe
<Current directory>\HMww.ico
%TEMP%\GegocIwU.bat
<Current directory>\bkoE.ico
<Current directory>\KEAs.exe
<Current directory>\SWEM.ico
<Current directory>\RoAq.exe
%TEMP%\vkggwoMM.bat
<Current directory>\ycMM.exe
<Current directory>\icAc.ico
<Current directory>\ZUUm.exe
<Current directory>\CEkA.ico
<Current directory>\lwES.exe
<Current directory>\TUMM.ico
<Current directory>\VYku.exe
<Current directory>\IcQE.ico
%TEMP%\WMsMUAgc.bat
<Current directory>\wsIw.ico
<Current directory>\towe.exe
<Current directory>\zUEy.exe
<Current directory>\oiEI.ico
<Current directory>\HokA.ico
%TEMP%\zsAcAEIQ.bat
%TEMP%\IwYMIAgQ.bat
<Current directory>\LccG.exe
<Current directory>\hwwq.exe
<Current directory>\teok.ico
<Current directory>\xIoU.ico
<Current directory>\RKUs.ico
<Current directory>\JMkC.exe
<Current directory>\ZcwO.exe
%TEMP%\RmMcswIs.bat
<Current directory>\vggM.ico
%TEMP%\CuQocgsw.bat
%TEMP%\VeckAUkw.bat
<Current directory>\iEkO.exe
<Current directory>\IgIS.exe
<Current directory>\YgAK.exe
<Current directory>\kqoA.ico
<Current directory>\GUgc.ico
%TEMP%\vusAIsww.bat
<Current directory>\sEAq.exe
<Current directory>\fyIo.ico
<Current directory>\nwkY.ico
%TEMP%\zSYgwooE.bat
<Current directory>\fAkk.exe
<Current directory>\MikQ.ico
<Current directory>\mwgg.exe
<Current directory>\HEwM.ico
<Current directory>\PYIE.exe
<Current directory>\dswo.ico
%TEMP%\BIYcAEgA.bat
<Current directory>\NAgc.ico
<Current directory>\WEoU.exe
<Current directory>\NkEk.exe
<Current directory>\QkYw.ico
<Current directory>\kcAW.exe
<Current directory>\mGkU.ico
<Current directory>\HkcQ.exe

Moves the following files:

from C:\RCX14.tmp to <Current directory>\ngIW.exe
from C:\RCX15.tmp to <Current directory>\jgUo.exe
from C:\RCX16.tmp to <Current directory>\DQQy.exe
from C:\RCX13.tmp to <Current directory>\VUku.exe
from C:\RCX10.tmp to <Current directory>\dwAO.exe
from C:\RCX11.tmp to <Current directory>\vckI.exe
from C:\RCX12.tmp to <Current directory>\KEAs.exe
from C:\RCX17.tmp to <Current directory>\DsAC.exe
from C:\RCX1C.tmp to <Current directory>\RoAq.exe
from C:\RCX1D.tmp to <Current directory>\lwES.exe
from C:\RCX1E.tmp to <Current directory>\ZUUm.exe
from C:\RCX1B.tmp to <Current directory>\ycMM.exe
from C:\RCX18.tmp to <Current directory>\VYku.exe
from C:\RCX19.tmp to <Current directory>\towe.exe
from C:\RCX1A.tmp to <Current directory>\zUEy.exe
from C:\RCX5.tmp to <Current directory>\LccG.exe
from C:\RCX6.tmp to <Current directory>\ZcwO.exe
from C:\RCX7.tmp to <Current directory>\JMkC.exe
from C:\RCX4.tmp to <Current directory>\hwwq.exe
from C:\RCX1.tmp to <Current directory>\iEkO.exe
from C:\RCX2.tmp to <Current directory>\IgIS.exe
from C:\RCX3.tmp to <Current directory>\YgAK.exe
from C:\RCX8.tmp to <Current directory>\WEoU.exe
from C:\RCXD.tmp to <Current directory>\fAkk.exe
from C:\RCXE.tmp to <Current directory>\PYIE.exe
from C:\RCXF.tmp to <Current directory>\mwgg.exe
from C:\RCXC.tmp to <Current directory>\sEAq.exe
from C:\RCX9.tmp to <Current directory>\NkEk.exe
from C:\RCXA.tmp to <Current directory>\HkcQ.exe
from C:\RCXB.tmp to <Current directory>\kcAW.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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