Trojan.DownLoader12.31789

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%\kUcAUQso.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\IesQUIAU.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\hIgEAEQY.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\SecYcUkI.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\gYUwogQo.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\jQQYEgkA.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\YeQAwkwg.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%\jYwMgMkA.bat" "<Full path to virus>""
'<SYSTEM32>\cscript.exe' %TEMP%\file.vbs
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\CUkYogQI.bat" "<Full path to virus>""

Modifies file system :

Creates the following files:

<Current directory>\WsIS.exe
C:\RCX13.tmp
<Current directory>\qIAo.ico
<Current directory>\TSIk.ico
<Current directory>\HKwI.ico
<Current directory>\JMIa.exe
C:\RCX12.tmp
<Current directory>\hEsW.exe
<Current directory>\KKMo.ico
<Current directory>\PsEQ.exe
C:\RCX16.tmp
C:\RCX15.tmp
C:\RCX14.tmp
<Current directory>\baUc.ico
<Current directory>\ewAm.exe
C:\RCX11.tmp
<Current directory>\JcsM.exe
C:\RCXE.tmp
<Current directory>\JWgY.ico
<Current directory>\fuMY.ico
<Current directory>\pIgy.exe
C:\RCXD.tmp
%TEMP%\TSQwUIAc.bat
<Current directory>\kokE.exe
C:\RCX10.tmp
<Current directory>\vEoU.ico
<Current directory>\RgkQ.exe
<Current directory>\hsYK.exe
C:\RCXF.tmp
%TEMP%\ZioQgMkE.bat
<Current directory>\JUcc.ico
C:\RCX1D.tmp
<Current directory>\rMYE.ico
<Current directory>\OwMm.exe
<Current directory>\lQoi.exe
<Current directory>\kgIm.exe
C:\RCX1C.tmp
<Current directory>\DKIQ.ico
C:\RCX1E.tmp
<Current directory>\kwci.exe
<Current directory>\SCcE.ico
<Current directory>\Zgsu.exe
<Current directory>\LSYo.ico
<Current directory>\BiQs.ico
<Current directory>\MwMs.exe
C:\RCX1F.tmp
<Current directory>\MykM.ico
<Current directory>\VYsc.exe
C:\RCX18.tmp
<Current directory>\YaUk.ico
<Current directory>\hsAs.ico
<Current directory>\NoUg.ico
<Current directory>\ukcy.exe
C:\RCX17.tmp
<Current directory>\jUok.exe
<Current directory>\zqYA.ico
<Current directory>\iUkS.exe
C:\RCX1B.tmp
C:\RCX1A.tmp
C:\RCX19.tmp
<Current directory>\KyEU.ico
<Current directory>\hQUK.exe
%TEMP%\IesQUIAU.bat
%TEMP%\NYUcwEYE.bat
%TEMP%\kUcAUQso.bat
%TEMP%\QaAkAEkw.bat
%TEMP%\YeQAwkwg.bat
%TEMP%\nEoQwwMM.bat
%TEMP%\hIgEAEQY.bat
%TEMP%\DEckIMck.bat
<Current directory>\uMQW.exe
%TEMP%\TKQkcEUU.bat
C:\RCX3.tmp
<Current directory>\pWcE.ico
%TEMP%\jQQYEgkA.bat
<Current directory>\ZMwS.exe
C:\RCX2.tmp
<Current directory>\WMsU.ico
C:\Documents and Settings\LocalService\NIMMEwsg\jaQEcQMQ
%TEMP%\wwQYcEYY.bat
<Current directory>\<Virus name>
%ALLUSERSPROFILE%\casg.txt
%HOMEPATH%\NIMMEwsg\jaQEcQMQ
%ALLUSERSPROFILE%\vesswIQA\AcIcUcAM
%ALLUSERSPROFILE%\lwQggIEM\nwAEcgMA.exe
<Current directory>\cCYw.ico
%TEMP%\AukUosAE.bat
%TEMP%\jYwMgMkA.bat
%TEMP%\wgwAoMEY.bat
%TEMP%\file.vbs
%TEMP%\CUkYogQI.bat
<Current directory>\esMu.exe
C:\RCX1.tmp
%TEMP%\SecYcUkI.bat
<Current directory>\DwoA.ico
<Current directory>\xkYe.exe
C:\RCX9.tmp
C:\RCX8.tmp
<Current directory>\YegA.ico
<Current directory>\jEMq.exe
C:\RCXA.tmp
<Current directory>\TsMs.exe
C:\RCXC.tmp
<Current directory>\CYAA.ico
<Current directory>\twks.ico
<Current directory>\ZYQI.ico
<Current directory>\fUIo.exe
C:\RCXB.tmp
<Current directory>\acwW.exe
<Current directory>\sIUM.ico
<Current directory>\dQIW.exe
C:\RCX5.tmp
C:\RCX4.tmp
%TEMP%\gYUwogQo.bat
<Current directory>\sEgE.ico
<Current directory>\uYEQ.exe
<Current directory>\oucE.ico
C:\RCX7.tmp
%TEMP%\oyUcgAsk.bat
<Current directory>\Cwcc.ico
<Current directory>\eUsw.exe
<Current directory>\iIcm.exe
C:\RCX6.tmp
<Current directory>\bEcM.ico

Deletes the following files:

<Current directory>\TSIk.ico
<Current directory>\hEsW.exe
<Current directory>\HKwI.ico
<Current directory>\WsIS.exe
<Current directory>\qIAo.ico
<Current directory>\PsEQ.exe
<Current directory>\KKMo.ico
<Current directory>\ewAm.exe
<Current directory>\baUc.ico
<Current directory>\JWgY.ico
<Current directory>\hsYK.exe
<Current directory>\fuMY.ico
<Current directory>\kokE.exe
<Current directory>\JUcc.ico
%TEMP%\bbd5_appcompat.txt
<Current directory>\JMIa.exe
<Current directory>\RgkQ.exe
<Current directory>\vEoU.ico
<Current directory>\ukcy.exe
<Current directory>\lQoi.exe
<Current directory>\DKIQ.ico
<Current directory>\kgIm.exe
<Current directory>\MykM.ico
<Current directory>\OwMm.exe
<Current directory>\BiQs.ico
<Current directory>\LSYo.ico
<Current directory>\rMYE.ico
<Current directory>\MwMs.exe
<Current directory>\hsAs.ico
<Current directory>\jUok.exe
<Current directory>\NoUg.ico
<Current directory>\VYsc.exe
<Current directory>\YaUk.ico
<Current directory>\iUkS.exe
<Current directory>\zqYA.ico
<Current directory>\hQUK.exe
<Current directory>\KyEU.ico
%TEMP%\TKQkcEUU.bat
<Current directory>\uMQW.exe
<Current directory>\ZMwS.exe
<Current directory>\WMsU.ico
<Current directory>\pWcE.ico
<Current directory>\dQIW.exe
<Current directory>\sIUM.ico
<Current directory>\uYEQ.exe
<Current directory>\sEgE.ico
<Current directory>\esMu.exe
<Current directory>\cCYw.ico
%TEMP%\wwQYcEYY.bat
%TEMP%\AukUosAE.bat
%TEMP%\wgwAoMEY.bat
%TEMP%\NYUcwEYE.bat
%TEMP%\DEckIMck.bat
%TEMP%\nEoQwwMM.bat
%TEMP%\QaAkAEkw.bat
<Current directory>\iIcm.exe
<Current directory>\ZYQI.ico
<Current directory>\TsMs.exe
<Current directory>\DwoA.ico
<Current directory>\fUIo.exe
<Current directory>\twks.ico
%TEMP%\TSQwUIAc.bat
<Current directory>\JcsM.exe
<Current directory>\pIgy.exe
<Current directory>\CYAA.ico
<Current directory>\bEcM.ico
%TEMP%\oyUcgAsk.bat
<Current directory>\oucE.ico
<Current directory>\eUsw.exe
<Current directory>\acwW.exe
<Current directory>\YegA.ico
<Current directory>\xkYe.exe
<Current directory>\Cwcc.ico
<Current directory>\jEMq.exe

Moves the following files:

from C:\RCX15.tmp to <Current directory>\ewAm.exe
from C:\RCX16.tmp to <Current directory>\PsEQ.exe
from C:\RCX17.tmp to <Current directory>\ukcy.exe
from C:\RCX14.tmp to <Current directory>\hEsW.exe
from C:\RCX11.tmp to <Current directory>\RgkQ.exe
from C:\RCX12.tmp to <Current directory>\JMIa.exe
from C:\RCX13.tmp to <Current directory>\WsIS.exe
from C:\RCX18.tmp to <Current directory>\VYsc.exe
from C:\RCX1D.tmp to <Current directory>\lQoi.exe
from C:\RCX1E.tmp to <Current directory>\OwMm.exe
from C:\RCX1F.tmp to <Current directory>\MwMs.exe
from C:\RCX1C.tmp to <Current directory>\kgIm.exe
from C:\RCX19.tmp to <Current directory>\jUok.exe
from C:\RCX1A.tmp to <Current directory>\hQUK.exe
from C:\RCX1B.tmp to <Current directory>\iUkS.exe
from C:\RCX10.tmp to <Current directory>\hsYK.exe
from C:\RCX5.tmp to <Current directory>\dQIW.exe
from C:\RCX6.tmp to <Current directory>\iIcm.exe
from C:\RCX7.tmp to <Current directory>\eUsw.exe
from C:\RCX4.tmp to <Current directory>\uYEQ.exe
from C:\RCX1.tmp to <Current directory>\esMu.exe
from C:\RCX2.tmp to <Current directory>\ZMwS.exe
from C:\RCX3.tmp to <Current directory>\uMQW.exe
from C:\RCX8.tmp to <Current directory>\acwW.exe
from C:\RCXD.tmp to <Current directory>\pIgy.exe
from C:\RCXE.tmp to <Current directory>\JcsM.exe
from C:\RCXF.tmp to <Current directory>\kokE.exe
from C:\RCXC.tmp to <Current directory>\TsMs.exe
from C:\RCX9.tmp to <Current directory>\jEMq.exe
from C:\RCXA.tmp to <Current directory>\xkYe.exe
from C:\RCXB.tmp to <Current directory>\fUIo.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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