Trojan.DownLoader12.31800

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%\RygcQgcU.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\dSUgYsIE.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\vYIQogQg.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\DcUgAgIQ.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\oCsYMIsc.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\nKEwQksA.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\euYkIkYY.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%\ScYwUEoc.bat" "<Full path to virus>""
'<SYSTEM32>\cscript.exe' %TEMP%\file.vbs
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\rmIgocEo.bat" "<Full path to virus>""

Modifies file system :

Creates the following files:

<Current directory>\OmoM.ico
<Current directory>\noYk.exe
C:\RCX11.tmp
%TEMP%\UgscYQIM.bat
C:\RCX10.tmp
%TEMP%\nKEwQksA.bat
<Current directory>\HykY.ico
<Current directory>\JQAE.ico
<Current directory>\oEQS.exe
C:\RCX13.tmp
<Current directory>\YkgI.exe
C:\RCX12.tmp
%TEMP%\EesIEQso.bat
<Current directory>\EMMw.exe
C:\RCXD.tmp
<Current directory>\SmMs.ico
<Current directory>\VwEQ.exe
C:\RCXC.tmp
<Current directory>\CwYg.ico
<Current directory>\ncAi.exe
C:\RCXF.tmp
<Current directory>\tqAc.ico
<Current directory>\hAUg.exe
C:\RCXE.tmp
<Current directory>\GikA.ico
<Current directory>\hIYa.exe
%TEMP%\oCsYMIsc.bat
<Current directory>\kkQI.ico
<Current directory>\BcYU.exe
C:\RCX19.tmp
<Current directory>\dAUG.exe
C:\RCX18.tmp
%TEMP%\SiYIkUYQ.bat
%TEMP%\DcUgAgIQ.bat
%TEMP%\yIokIQAo.bat
<Current directory>\nAQo.ico
<Current directory>\RYQk.exe
<Current directory>\xsAI.ico
<Current directory>\Rwsy.exe
C:\RCX1A.tmp
<Current directory>\JsIs.ico
<Current directory>\vcgc.exe
C:\RCX15.tmp
<Current directory>\jGsE.ico
<Current directory>\AsIu.exe
C:\RCX14.tmp
<Current directory>\nmQY.ico
<Current directory>\TooO.exe
C:\RCX17.tmp
<Current directory>\leEk.ico
<Current directory>\rswA.exe
C:\RCX16.tmp
<Current directory>\PMQo.ico
%TEMP%\euYkIkYY.bat
%TEMP%\ueMokksI.bat
<Current directory>\BIIo.exe
%TEMP%\TUooQEAc.bat
%TEMP%\ScYwUEoc.bat
%TEMP%\OkgcsYko.bat
C:\RCX2.tmp
C:\RCX3.tmp
<Current directory>\VCUo.ico
<Current directory>\SUkK.exe
%TEMP%\vYIQogQg.bat
<Current directory>\eSsk.ico
<Current directory>\fgUU.exe
%ALLUSERSPROFILE%\casg.txt
C:\Documents and Settings\LocalService\NIMMEwsg\jaQEcQMQ
<Current directory>\VKkI.ico
%HOMEPATH%\NIMMEwsg\jaQEcQMQ
%ALLUSERSPROFILE%\vesswIQA\AcIcUcAM
%ALLUSERSPROFILE%\lwQggIEM\nwAEcgMA.exe
%TEMP%\tMsQAgMo.bat
%TEMP%\rmIgocEo.bat
<Current directory>\RMYM.ico
%TEMP%\file.vbs
<Current directory>\<Virus name>
<Current directory>\UIsw.exe
C:\RCX1.tmp
C:\RCX4.tmp
C:\RCX9.tmp
<Current directory>\HKEU.ico
<Current directory>\rgAS.exe
C:\RCX8.tmp
<Current directory>\vCMQ.ico
<Current directory>\XwUa.exe
%TEMP%\rUIwEMUg.bat
C:\RCXB.tmp
%TEMP%\RygcQgcU.bat
<Current directory>\tccY.ico
C:\RCXA.tmp
<Current directory>\KEEc.ico
<Current directory>\Jski.exe
%TEMP%\eQAAYUwQ.bat
<Current directory>\SGEA.ico
<Current directory>\IIIE.exe
<Current directory>\FSUw.ico
<Current directory>\NIsg.exe
C:\RCX5.tmp
C:\RCX6.tmp
C:\RCX7.tmp
<Current directory>\jEsE.ico
<Current directory>\kMQc.exe
<Current directory>\hIMo.ico
<Current directory>\sUME.exe
%TEMP%\dSUgYsIE.bat

Deletes the following files:

<Current directory>\HykY.ico
<Current directory>\YkgI.exe
<Current directory>\OmoM.ico
%TEMP%\EesIEQso.bat
<Current directory>\AsIu.exe
<Current directory>\JQAE.ico
<Current directory>\oEQS.exe
<Current directory>\noYk.exe
<Current directory>\hIYa.exe
<Current directory>\SmMs.ico
<Current directory>\ncAi.exe
<Current directory>\GikA.ico
<Current directory>\tqAc.ico
<Current directory>\hAUg.exe
%TEMP%\UgscYQIM.bat
<Current directory>\jGsE.ico
<Current directory>\kkQI.ico
<Current directory>\BcYU.exe
%TEMP%\SiYIkUYQ.bat
<Current directory>\Rwsy.exe
<Current directory>\nAQo.ico
%TEMP%\yIokIQAo.bat
<Current directory>\xsAI.ico
<Current directory>\leEk.ico
<Current directory>\rswA.exe
<Current directory>\JsIs.ico
<Current directory>\vcgc.exe
<Current directory>\nmQY.ico
<Current directory>\dAUG.exe
<Current directory>\PMQo.ico
<Current directory>\TooO.exe
<Current directory>\CwYg.ico
<Current directory>\SUkK.exe
<Current directory>\eSsk.ico
<Current directory>\fgUU.exe
<Current directory>\VCUo.ico
%TEMP%\eQAAYUwQ.bat
<Current directory>\FSUw.ico
<Current directory>\NIsg.exe
<Current directory>\RMYM.ico
<Current directory>\VKkI.ico
<Current directory>\UIsw.exe
%TEMP%\tMsQAgMo.bat
%TEMP%\TUooQEAc.bat
<Current directory>\BIIo.exe
%TEMP%\ueMokksI.bat
%TEMP%\OkgcsYko.bat
<Current directory>\IIIE.exe
<Current directory>\Jski.exe
<Current directory>\HKEU.ico
<Current directory>\rgAS.exe
<Current directory>\KEEc.ico
<Current directory>\EMMw.exe
<Current directory>\tccY.ico
<Current directory>\VwEQ.exe
%TEMP%\rUIwEMUg.bat
<Current directory>\hIMo.ico
<Current directory>\sUME.exe
<Current directory>\SGEA.ico
<Current directory>\kMQc.exe
<Current directory>\vCMQ.ico
<Current directory>\XwUa.exe
<Current directory>\jEsE.ico

Moves the following files:

from C:\RCX11.tmp to <Current directory>\noYk.exe
from C:\RCX12.tmp to <Current directory>\YkgI.exe
from C:\RCX13.tmp to <Current directory>\oEQS.exe
from C:\RCXE.tmp to <Current directory>\ncAi.exe
from C:\RCXF.tmp to <Current directory>\hIYa.exe
from C:\RCX10.tmp to <Current directory>\hAUg.exe
from C:\RCX14.tmp to <Current directory>\AsIu.exe
from C:\RCX18.tmp to <Current directory>\dAUG.exe
from C:\RCX19.tmp to <Current directory>\BcYU.exe
from C:\RCX1A.tmp to <Current directory>\Rwsy.exe
from C:\RCX15.tmp to <Current directory>\vcgc.exe
from C:\RCX16.tmp to <Current directory>\rswA.exe
from C:\RCX17.tmp to <Current directory>\TooO.exe
from C:\RCX4.tmp to <Current directory>\SUkK.exe
from C:\RCX5.tmp to <Current directory>\NIsg.exe
from C:\RCX6.tmp to <Current directory>\IIIE.exe
from C:\RCX1.tmp to <Current directory>\UIsw.exe
from C:\RCX2.tmp to <Current directory>\BIIo.exe
from C:\RCX3.tmp to <Current directory>\fgUU.exe
from C:\RCX7.tmp to <Current directory>\sUME.exe
from C:\RCXB.tmp to <Current directory>\Jski.exe
from C:\RCXC.tmp to <Current directory>\VwEQ.exe
from C:\RCXD.tmp to <Current directory>\EMMw.exe
from C:\RCX8.tmp to <Current directory>\kMQc.exe
from C:\RCX9.tmp to <Current directory>\XwUa.exe
from C:\RCXA.tmp to <Current directory>\rgAS.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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