Trojan.DownLoader12.25416

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>\cscript.exe' %TEMP%\file.vbs
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\jkEUQQYQ.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\ncAAMcsk.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\ziQcEswQ.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>\reg.exe' add HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /d 0 /t REG_DWORD /f

Modifies file system :

Creates the following files:

<Current directory>\iYow.exe
C:\RCX15.tmp
<Current directory>\dqMQ.ico
C:\RCX14.tmp
%TEMP%\file.vbs
<Current directory>\KGcU.ico
<Current directory>\wMkO.exe
C:\RCX17.tmp
<Current directory>\aWEg.ico
<Current directory>\koka.exe
C:\RCX16.tmp
<Current directory>\wwYU.ico
<Current directory>\ewks.exe
%TEMP%\ziQcEswQ.bat
C:\RCX11.tmp
<Current directory>\fMcw.ico
<Current directory>\hQkE.exe
C:\RCX10.tmp
<Current directory>\ngAg.ico
<Current directory>\QYIU.exe
C:\RCX12.tmp
%TEMP%\xOUQAYEU.bat
<Current directory>\DIAQ.ico
<Current directory>\hcYm.exe
<Current directory>\uaYo.ico
<Current directory>\goAk.exe
C:\RCX13.tmp
C:\RCX1D.tmp
<Current directory>\hoYw.ico
<Current directory>\Lwcy.exe
C:\RCX1C.tmp
<Current directory>\zUcw.ico
<Current directory>\DUUI.exe
C:\RCX1E.tmp
<Current directory>\JkwS.exe
C:\RCX1F.tmp
<Current directory>\rOwM.ico
%TEMP%\RAwEAwwo.bat
%TEMP%\ncAAMcsk.bat
<Current directory>\bEgI.ico
<Current directory>\LsoU.exe
C:\RCX19.tmp
<Current directory>\cCQo.ico
<Current directory>\HAss.exe
C:\RCX18.tmp
<Current directory>\BscA.ico
<Current directory>\bsIW.exe
C:\RCX1A.tmp
C:\RCX1B.tmp
%TEMP%\jkEUQQYQ.bat
<Current directory>\uqEk.ico
%TEMP%\IwcQgIkE.bat
<Current directory>\IYEM.ico
<Current directory>\aIUY.exe
<Current directory>\EYEA.exe
C:\RCX4.tmp
<Current directory>\OYcw.ico
<Current directory>\FooI.exe
C:\RCX3.tmp
<Current directory>\WWQQ.ico
<Current directory>\Esww.exe
C:\RCX6.tmp
<Current directory>\AawU.ico
<Current directory>\HcwS.exe
C:\RCX5.tmp
<Current directory>\UUoc.ico
<Current directory>\MMkI.exe
<Current directory>\OyMY.ico
C:\Documents and Settings\LocalService\NIMMEwsg\jaQEcQMQ
%ALLUSERSPROFILE%\casg.txt
%TEMP%\HQcYwsYo.bat
%HOMEPATH%\NIMMEwsg\jaQEcQMQ
%ALLUSERSPROFILE%\vesswIQA\AcIcUcAM
%ALLUSERSPROFILE%\lwQggIEM\nwAEcgMA.exe
<Current directory>\<Virus name>
<Current directory>\VMkU.ico
<Current directory>\HYoW.exe
C:\RCX2.tmp
<Current directory>\eksQ.ico
<Current directory>\SYEE.exe
C:\RCX1.tmp
<Current directory>\LAwe.exe
C:\RCXD.tmp
<Current directory>\GusA.ico
<Current directory>\WEAg.exe
C:\RCXC.tmp
<Current directory>\ucAA.ico
<Current directory>\UAoE.exe
C:\RCXF.tmp
<Current directory>\IggA.ico
<Current directory>\gocm.exe
C:\RCXE.tmp
<Current directory>\jiwI.ico
<Current directory>\WcQW.exe
<Current directory>\kUwQ.ico
C:\RCX8.tmp
<Current directory>\jEgI.ico
<Current directory>\IcMo.exe
C:\RCX7.tmp
<Current directory>\giYo.ico
<Current directory>\isMG.exe
C:\RCX9.tmp
<Current directory>\cuQc.ico
<Current directory>\bQgM.exe
C:\RCXB.tmp
<Current directory>\VIkA.ico
<Current directory>\HYAi.exe
C:\RCXA.tmp

Deletes the following files:

<Current directory>\KGcU.ico
<Current directory>\wMkO.exe
<Current directory>\DIAQ.ico
<Current directory>\iYow.exe
<Current directory>\wwYU.ico
<Current directory>\koka.exe
<Current directory>\dqMQ.ico
<Current directory>\ewks.exe
<Current directory>\hQkE.exe
<Current directory>\fMcw.ico
<Current directory>\QYIU.exe
<Current directory>\ngAg.ico
<Current directory>\uaYo.ico
<Current directory>\hcYm.exe
<Current directory>\goAk.exe
%TEMP%\xOUQAYEU.bat
<Current directory>\aWEg.ico
<Current directory>\zUcw.ico
%TEMP%\RAwEAwwo.bat
<Current directory>\uqEk.ico
<Current directory>\DUUI.exe
<Current directory>\JkwS.exe
<Current directory>\bEgI.ico
<Current directory>\Lwcy.exe
<Current directory>\hoYw.ico
<Current directory>\HAss.exe
<Current directory>\cCQo.ico
<Current directory>\bsIW.exe
<Current directory>\BscA.ico
<Current directory>\IYEM.ico
<Current directory>\LsoU.exe
%TEMP%\IwcQgIkE.bat
<Current directory>\aIUY.exe
<Current directory>\OYcw.ico
<Current directory>\MMkI.exe
<Current directory>\WWQQ.ico
<Current directory>\Esww.exe
<Current directory>\AawU.ico
<Current directory>\isMG.exe
<Current directory>\UUoc.ico
<Current directory>\HcwS.exe
<Current directory>\eksQ.ico
<Current directory>\HYoW.exe
%TEMP%\HQcYwsYo.bat
<Current directory>\SYEE.exe
<Current directory>\OyMY.ico
<Current directory>\EYEA.exe
<Current directory>\VMkU.ico
<Current directory>\FooI.exe
<Current directory>\giYo.ico
<Current directory>\UAoE.exe
<Current directory>\GusA.ico
<Current directory>\LAwe.exe
<Current directory>\ucAA.ico
<Current directory>\gocm.exe
<Current directory>\IggA.ico
<Current directory>\WcQW.exe
<Current directory>\jiwI.ico
<Current directory>\HYAi.exe
<Current directory>\VIkA.ico
<Current directory>\IcMo.exe
<Current directory>\jEgI.ico
<Current directory>\WEAg.exe
<Current directory>\kUwQ.ico
<Current directory>\bQgM.exe
<Current directory>\cuQc.ico

Moves the following files:

from C:\RCX15.tmp to <Current directory>\iYow.exe
from C:\RCX16.tmp to <Current directory>\wMkO.exe
from C:\RCX17.tmp to <Current directory>\ewks.exe
from C:\RCX14.tmp to <Current directory>\hcYm.exe
from C:\RCX11.tmp to <Current directory>\QYIU.exe
from C:\RCX12.tmp to <Current directory>\hQkE.exe
from C:\RCX13.tmp to <Current directory>\goAk.exe
from C:\RCX18.tmp to <Current directory>\koka.exe
from C:\RCX1D.tmp to <Current directory>\DUUI.exe
from C:\RCX1E.tmp to <Current directory>\Lwcy.exe
from C:\RCX1F.tmp to <Current directory>\JkwS.exe
from C:\RCX1C.tmp to <Current directory>\LsoU.exe
from C:\RCX19.tmp to <Current directory>\bsIW.exe
from C:\RCX1A.tmp to <Current directory>\HAss.exe
from C:\RCX1B.tmp to <Current directory>\aIUY.exe
from C:\RCX10.tmp to <Current directory>\gocm.exe
from C:\RCX5.tmp to <Current directory>\Esww.exe
from C:\RCX6.tmp to <Current directory>\MMkI.exe
from C:\RCX7.tmp to <Current directory>\HcwS.exe
from C:\RCX4.tmp to <Current directory>\EYEA.exe
from C:\RCX1.tmp to <Current directory>\SYEE.exe
from C:\RCX2.tmp to <Current directory>\HYoW.exe
from C:\RCX3.tmp to <Current directory>\FooI.exe
from C:\RCX8.tmp to <Current directory>\isMG.exe
from C:\RCXD.tmp to <Current directory>\LAwe.exe
from C:\RCXE.tmp to <Current directory>\UAoE.exe
from C:\RCXF.tmp to <Current directory>\WcQW.exe
from C:\RCXC.tmp to <Current directory>\WEAg.exe
from C:\RCX9.tmp to <Current directory>\IcMo.exe
from C:\RCXA.tmp to <Current directory>\HYAi.exe
from C:\RCXB.tmp to <Current directory>\bQgM.exe

Network activity:

Connects to:

'74.##5.232.51':80
'bl##k.io':443

TCP:

HTTP GET requests:

74.##5.232.51/

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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