Trojan.DownLoader12.25419

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%\yQAYQgMk.bat" "<Full path to virus>""
'<SYSTEM32>\cscript.exe' %TEMP%\file.vbs
'<SYSTEM32>\wbem\wmiadap.exe' /R /T
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\KSwcIYEA.bat" "<Full path to virus>""
'<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%\lugoogEs.bat" "<Full path to virus>""
'<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>\NSkE.ico
<Current directory>\mAoy.exe
C:\RCX15.tmp
<Current directory>\AqEM.ico
<Current directory>\CkAm.exe
C:\RCX14.tmp
<Current directory>\KMkg.ico
<Current directory>\MUEE.exe
C:\RCX17.tmp
<Current directory>\rSks.ico
<Current directory>\rscc.exe
C:\RCX16.tmp
<Current directory>\xgkM.ico
C:\RCX10.tmp
<Current directory>\wegg.ico
<Current directory>\pMMW.exe
C:\RCXF.tmp
<Current directory>\Wcsk.ico
<Current directory>\KYgM.exe
C:\RCX11.tmp
<Current directory>\uqcs.ico
<Current directory>\jcQs.exe
C:\RCX13.tmp
<Current directory>\zwkE.ico
<Current directory>\EEIW.exe
C:\RCX12.tmp
<Current directory>\gEsO.exe
C:\RCX1C.tmp
<Current directory>\CSQk.ico
<Current directory>\sUkO.exe
%TEMP%\KSwcIYEA.bat
<Current directory>\VkYw.ico
<Current directory>\rQMo.exe
C:\RCX1D.tmp
<Current directory>\eSsQ.ico
<Current directory>\gwIm.exe
C:\RCX1F.tmp
<Current directory>\JygY.ico
<Current directory>\qIIU.exe
C:\RCX1E.tmp
<Current directory>\BkIC.exe
C:\RCX19.tmp
%TEMP%\yQAYQgMk.bat
C:\RCX18.tmp
%TEMP%\bKYcUkgA.bat
<Current directory>\qkIo.ico
<Current directory>\PkIM.ico
<Current directory>\OaQw.ico
<Current directory>\OIQM.exe
C:\RCX1B.tmp
<Current directory>\HMog.exe
C:\RCX1A.tmp
%TEMP%\YkYQowgY.bat
<Current directory>\cgEO.exe
<Current directory>\HSYM.ico
<Current directory>\HQIc.exe
C:\RCX4.tmp
<Current directory>\CkUA.ico
<Current directory>\zEgM.exe
C:\RCX3.tmp
<Current directory>\NYsI.ico
<Current directory>\fUII.exe
C:\RCX6.tmp
%TEMP%\OeUkMYAU.bat
<Current directory>\LEEE.exe
C:\RCX5.tmp
<Current directory>\KOcA.ico
C:\Documents and Settings\LocalService\NIMMEwsg\jaQEcQMQ
%ALLUSERSPROFILE%\casg.txt
%TEMP%\lOkMEcUA.bat
%HOMEPATH%\NIMMEwsg\jaQEcQMQ
%ALLUSERSPROFILE%\vesswIQA\AcIcUcAM
%ALLUSERSPROFILE%\lwQggIEM\nwAEcgMA.exe
<Current directory>\<Virus name>
<Current directory>\fqgg.ico
<Current directory>\ncYW.exe
C:\RCX2.tmp
<Current directory>\wKgs.ico
<Current directory>\vscO.exe
C:\RCX1.tmp
<Current directory>\XMsY.ico
<Current directory>\XykM.ico
<Current directory>\Jcsc.exe
C:\RCXC.tmp
<Current directory>\xeEE.ico
<Current directory>\YIQU.exe
C:\RCXB.tmp
<Current directory>\cUYc.ico
<Current directory>\ikYW.exe
C:\RCXE.tmp
<Current directory>\asIE.ico
<Current directory>\YUMm.exe
C:\RCXD.tmp
<Current directory>\psIM.ico
%TEMP%\file.vbs
<Current directory>\mioo.ico
<Current directory>\JkMG.exe
<Current directory>\bAMg.exe
%TEMP%\lugoogEs.bat
C:\RCX7.tmp
C:\RCX8.tmp
<Current directory>\rwEk.ico
<Current directory>\SkAQ.exe
C:\RCXA.tmp
<Current directory>\RsQY.ico
<Current directory>\oQos.exe
C:\RCX9.tmp

Deletes the following files:

<Current directory>\NSkE.ico
<Current directory>\rscc.exe
<Current directory>\AqEM.ico
<Current directory>\mAoy.exe
<Current directory>\xgkM.ico
<Current directory>\gEsO.exe
<Current directory>\KMkg.ico
<Current directory>\MUEE.exe
<Current directory>\wegg.ico
<Current directory>\EEIW.exe
<Current directory>\Wcsk.ico
<Current directory>\pMMW.exe
<Current directory>\uqcs.ico
<Current directory>\CkAm.exe
<Current directory>\zwkE.ico
<Current directory>\jcQs.exe
<Current directory>\rSks.ico
<Current directory>\sUkO.exe
<Current directory>\CSQk.ico
<Current directory>\rQMo.exe
<Current directory>\VkYw.ico
<Current directory>\gwIm.exe
<Current directory>\eSsQ.ico
<Current directory>\qIIU.exe
<Current directory>\JygY.ico
<Current directory>\qkIo.ico
<Current directory>\HMog.exe
%TEMP%\bKYcUkgA.bat
<Current directory>\BkIC.exe
<Current directory>\OIQM.exe
<Current directory>\OaQw.ico
<Current directory>\PkIM.ico
%TEMP%\YkYQowgY.bat
<Current directory>\NYsI.ico
<Current directory>\fUII.exe
<Current directory>\HSYM.ico
<Current directory>\LEEE.exe
<Current directory>\bAMg.exe
<Current directory>\XMsY.ico
%TEMP%\OeUkMYAU.bat
<Current directory>\KOcA.ico
<Current directory>\wKgs.ico
<Current directory>\ncYW.exe
%TEMP%\lOkMEcUA.bat
<Current directory>\vscO.exe
<Current directory>\CkUA.ico
<Current directory>\HQIc.exe
<Current directory>\fqgg.ico
<Current directory>\zEgM.exe
<Current directory>\JkMG.exe
<Current directory>\cUYc.ico
<Current directory>\ikYW.exe
<Current directory>\XykM.ico
<Current directory>\YUMm.exe
<Current directory>\asIE.ico
<Current directory>\KYgM.exe
<Current directory>\psIM.ico
<Current directory>\cgEO.exe
<Current directory>\RsQY.ico
<Current directory>\SkAQ.exe
<Current directory>\mioo.ico
<Current directory>\oQos.exe
<Current directory>\xeEE.ico
<Current directory>\Jcsc.exe
<Current directory>\rwEk.ico
<Current directory>\YIQU.exe

Moves the following files:

from C:\RCX15.tmp to <Current directory>\mAoy.exe
from C:\RCX16.tmp to <Current directory>\rscc.exe
from C:\RCX17.tmp to <Current directory>\MUEE.exe
from C:\RCX14.tmp to <Current directory>\CkAm.exe
from C:\RCX11.tmp to <Current directory>\pMMW.exe
from C:\RCX12.tmp to <Current directory>\EEIW.exe
from C:\RCX13.tmp to <Current directory>\jcQs.exe
from C:\RCX18.tmp to <Current directory>\gEsO.exe
from C:\RCX1D.tmp to <Current directory>\sUkO.exe
from C:\RCX1E.tmp to <Current directory>\qIIU.exe
from C:\RCX1F.tmp to <Current directory>\gwIm.exe
from C:\RCX1C.tmp to <Current directory>\rQMo.exe
from C:\RCX19.tmp to <Current directory>\BkIC.exe
from C:\RCX1A.tmp to <Current directory>\HMog.exe
from C:\RCX1B.tmp to <Current directory>\OIQM.exe
from C:\RCX10.tmp to <Current directory>\KYgM.exe
from C:\RCX5.tmp to <Current directory>\LEEE.exe
from C:\RCX6.tmp to <Current directory>\fUII.exe
from C:\RCX7.tmp to <Current directory>\bAMg.exe
from C:\RCX4.tmp to <Current directory>\HQIc.exe
from C:\RCX1.tmp to <Current directory>\vscO.exe
from C:\RCX2.tmp to <Current directory>\ncYW.exe
from C:\RCX3.tmp to <Current directory>\zEgM.exe
from C:\RCX8.tmp to <Current directory>\JkMG.exe
from C:\RCXD.tmp to <Current directory>\YUMm.exe
from C:\RCXE.tmp to <Current directory>\ikYW.exe
from C:\RCXF.tmp to <Current directory>\cgEO.exe
from C:\RCXC.tmp to <Current directory>\Jcsc.exe
from C:\RCX9.tmp to <Current directory>\oQos.exe
from C:\RCXA.tmp to <Current directory>\SkAQ.exe
from C:\RCXB.tmp to <Current directory>\YIQU.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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