Trojan.DownLoader12.31815

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%\bwwIAIwA.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\osIIooYI.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\sqggEsMQ.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\PsMQYIIc.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\yWAoEUQg.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\IwAkEskY.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\RcQgQIEk.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>\cscript.exe' %TEMP%\file.vbs
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\GsMkskUE.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\eKoMcMUU.bat" "<Full path to virus>""

Modifies file system :

Creates the following files:

C:\RCXF.tmp
<Current directory>\IwYI.ico
<Current directory>\zMYu.exe
C:\RCXE.tmp
<Current directory>\heEU.ico
<Current directory>\AsgC.exe
C:\RCX10.tmp
<Current directory>\YigY.ico
<Current directory>\zQgi.exe
C:\RCX12.tmp
<Current directory>\qcso.ico
<Current directory>\Ugcy.exe
C:\RCX11.tmp
<Current directory>\tAcO.exe
C:\RCXB.tmp
%TEMP%\ZoYQEsUE.bat
<Current directory>\gMUM.ico
%TEMP%\PsMQYIIc.bat
<Current directory>\cCQI.ico
<Current directory>\soEM.exe
<Current directory>\aIkc.exe
<Current directory>\xUAS.exe
C:\RCXD.tmp
<Current directory>\uiMs.ico
%TEMP%\WWwUIwUM.bat
C:\RCXC.tmp
<Current directory>\QKcY.ico
C:\RCX18.tmp
<Current directory>\naEU.ico
<Current directory>\CAIm.exe
C:\RCX17.tmp
<Current directory>\FysU.ico
<Current directory>\hYsk.exe
C:\RCX19.tmp
<Current directory>\yEcc.ico
<Current directory>\bAYS.exe
C:\RCX1B.tmp
<Current directory>\TYAE.ico
<Current directory>\ZAYu.exe
C:\RCX1A.tmp
<Current directory>\fAYC.exe
<Current directory>\AqAY.ico
<Current directory>\rQQE.exe
C:\RCX14.tmp
<Current directory>\qoco.ico
<Current directory>\aUwm.exe
C:\RCX13.tmp
<Current directory>\MAAk.ico
<Current directory>\AMIC.exe
C:\RCX16.tmp
<Current directory>\uqUo.ico
<Current directory>\tgYM.exe
C:\RCX15.tmp
<Current directory>\NegA.ico
C:\RCX2.tmp
%TEMP%\RcQgQIEk.bat
<Current directory>\MusI.ico
%TEMP%\GsMkskUE.bat
%TEMP%\MkUYYYYA.bat
<Current directory>\LwUQ.exe
<Current directory>\Oksy.exe
%TEMP%\sqggEsMQ.bat
<Current directory>\FIgc.exe
C:\RCX4.tmp
C:\RCX3.tmp
%TEMP%\VaAgIMQg.bat
<Current directory>\wUAs.ico
<Current directory>\seMU.ico
%ALLUSERSPROFILE%\casg.txt
<Current directory>\vmEA.ico
C:\Documents and Settings\LocalService\NIMMEwsg\jaQEcQMQ
%HOMEPATH%\NIMMEwsg\jaQEcQMQ
%ALLUSERSPROFILE%\vesswIQA\AcIcUcAM
%ALLUSERSPROFILE%\lwQggIEM\nwAEcgMA.exe
%TEMP%\fYEoQgss.bat
%TEMP%\eKoMcMUU.bat
%TEMP%\SkYAUoQI.bat
%TEMP%\file.vbs
<Current directory>\<Virus name>
<Current directory>\SYsG.exe
C:\RCX1.tmp
%TEMP%\ueIMwkYs.bat
C:\RCX8.tmp
%TEMP%\yWAoEUQg.bat
C:\RCX7.tmp
<Current directory>\uSos.ico
<Current directory>\iIUE.exe
<Current directory>\Buko.ico
<Current directory>\vcwM.ico
<Current directory>\ygkw.exe
C:\RCXA.tmp
<Current directory>\SwQk.exe
C:\RCX9.tmp
%TEMP%\oGUEUkcQ.bat
<Current directory>\YAIO.exe
C:\RCX5.tmp
%TEMP%\osIIooYI.bat
%TEMP%\IIocscEI.bat
%TEMP%\xSEooUsM.bat
<Current directory>\FIIU.ico
<Current directory>\SYAa.exe
<Current directory>\zQwk.ico
%TEMP%\kEMAoQwY.bat
%TEMP%\IwAkEskY.bat
<Current directory>\ykAs.ico
<Current directory>\DYwo.exe
%TEMP%\bwwIAIwA.bat
C:\RCX6.tmp

Deletes the following files:

<Current directory>\Ugcy.exe
<Current directory>\IwYI.ico
<Current directory>\zMYu.exe
<Current directory>\qcso.ico
<Current directory>\aUwm.exe
<Current directory>\YigY.ico
<Current directory>\zQgi.exe
<Current directory>\heEU.ico
<Current directory>\xUAS.exe
<Current directory>\gMUM.ico
<Current directory>\aIkc.exe
<Current directory>\QKcY.ico
<Current directory>\AsgC.exe
<Current directory>\uiMs.ico
<Current directory>\tAcO.exe
<Current directory>\qoco.ico
<Current directory>\CAIm.exe
<Current directory>\FysU.ico
<Current directory>\hYsk.exe
<Current directory>\naEU.ico
<Current directory>\TYAE.ico
<SYSTEM32>\shell32.dll
<Current directory>\ZAYu.exe
<Current directory>\uqUo.ico
<Current directory>\tgYM.exe
<Current directory>\AqAY.ico
<Current directory>\rQQE.exe
<Current directory>\MAAk.ico
<Current directory>\fAYC.exe
<Current directory>\NegA.ico
<Current directory>\AMIC.exe
<Current directory>\cCQI.ico
<Current directory>\FIgc.exe
<Current directory>\MusI.ico
%TEMP%\VaAgIMQg.bat
<Current directory>\wUAs.ico
<Current directory>\FIIU.ico
<Current directory>\SYAa.exe
%TEMP%\xSEooUsM.bat
<Current directory>\Oksy.exe
<Current directory>\vmEA.ico
<Current directory>\SYsG.exe
%TEMP%\fYEoQgss.bat
%TEMP%\SkYAUoQI.bat
<Current directory>\seMU.ico
<Current directory>\LwUQ.exe
%TEMP%\MkUYYYYA.bat
%TEMP%\IIocscEI.bat
<Current directory>\Buko.ico
%TEMP%\oGUEUkcQ.bat
<Current directory>\SwQk.exe
<Current directory>\ygkw.exe
<Current directory>\soEM.exe
%TEMP%\ZoYQEsUE.bat
<Current directory>\vcwM.ico
<Current directory>\uSos.ico
<Current directory>\zQwk.ico
<Current directory>\DYwo.exe
%TEMP%\kEMAoQwY.bat
<Current directory>\YAIO.exe
<Current directory>\iIUE.exe
%TEMP%\ueIMwkYs.bat
<Current directory>\ykAs.ico

Moves the following files:

from C:\RCX11.tmp to <Current directory>\Ugcy.exe
from C:\RCX12.tmp to <Current directory>\zQgi.exe
from C:\RCX13.tmp to <Current directory>\aUwm.exe
from C:\RCXE.tmp to <Current directory>\tAcO.exe
from C:\RCXF.tmp to <Current directory>\AsgC.exe
from C:\RCX10.tmp to <Current directory>\zMYu.exe
from C:\RCX14.tmp to <Current directory>\rQQE.exe
from C:\RCX18.tmp to <Current directory>\hYsk.exe
from C:\RCX19.tmp to <Current directory>\CAIm.exe
from C:\RCX1A.tmp to <Current directory>\ZAYu.exe
from C:\RCX15.tmp to <Current directory>\tgYM.exe
from C:\RCX16.tmp to <Current directory>\AMIC.exe
from C:\RCX17.tmp to <Current directory>\fAYC.exe
from C:\RCX4.tmp to <Current directory>\FIgc.exe
from C:\RCX5.tmp to <Current directory>\SYAa.exe
from C:\RCX6.tmp to <Current directory>\DYwo.exe
from C:\RCX1.tmp to <Current directory>\SYsG.exe
from C:\RCX2.tmp to <Current directory>\LwUQ.exe
from C:\RCX3.tmp to <Current directory>\Oksy.exe
from C:\RCX7.tmp to <Current directory>\YAIO.exe
from C:\RCXB.tmp to <Current directory>\soEM.exe
from C:\RCXC.tmp to <Current directory>\aIkc.exe
from C:\RCXD.tmp to <Current directory>\xUAS.exe
from C:\RCX8.tmp to <Current directory>\iIUE.exe
from C:\RCX9.tmp to <Current directory>\SwQk.exe
from C:\RCXA.tmp to <Current directory>\ygkw.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: 'jaQEcQMQ.exe'
ClassName: 'Shell_TrayWnd' WindowName: ''
ClassName: '' WindowName: 'Microsoft Windows'
ClassName: 'Indicator' WindowName: ''
ClassName: '' WindowName: 'AcIcUcAM.exe'

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