Trojan.DownLoader12.25420

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>\wbem\wmiadap.exe' /R /T
'<SYSTEM32>\cscript.exe' %TEMP%\file.vbs
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\KKEUssUs.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\kyUcUgYQ.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%\Twksgswg.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>\UCkM.ico
<Current directory>\yMAq.exe
C:\RCX15.tmp
<Current directory>\AkQk.ico
<Current directory>\rsww.exe
C:\RCX14.tmp
<Current directory>\nakk.ico
<Current directory>\hYQW.exe
C:\RCX17.tmp
<Current directory>\ryEc.ico
<Current directory>\cgYW.exe
C:\RCX16.tmp
<Current directory>\hqEY.ico
%TEMP%\file.vbs
<Current directory>\Xooo.ico
<Current directory>\Ngoo.exe
<Current directory>\kIEQ.exe
C:\RCX10.tmp
%TEMP%\Twksgswg.bat
C:\RCX11.tmp
<Current directory>\yMgo.ico
<Current directory>\Gkwu.exe
C:\RCX13.tmp
<Current directory>\gQEo.ico
<Current directory>\wsYU.exe
C:\RCX12.tmp
<Current directory>\eQoo.exe
<Current directory>\ygUW.exe
C:\RCX1D.tmp
%TEMP%\sOMMYsAI.bat
<Current directory>\WcsE.exe
C:\RCX1C.tmp
<Current directory>\ggso.ico
<Current directory>\dSUs.ico
<Current directory>\osgo.ico
<Current directory>\CsQA.exe
C:\RCX1F.tmp
<Current directory>\NckM.exe
%TEMP%\KKEUssUs.bat
C:\RCX1E.tmp
C:\RCX19.tmp
%TEMP%\fWsMcwsA.bat
<Current directory>\hCMc.ico
C:\RCX18.tmp
<Current directory>\Ukcg.ico
<Current directory>\cwMU.exe
<Current directory>\nUsM.exe
%TEMP%\kyUcUgYQ.bat
C:\RCX1B.tmp
<Current directory>\BMkw.ico
C:\RCX1A.tmp
<Current directory>\ccEA.ico
<Current directory>\IEEW.exe
<Current directory>\JOUE.ico
<Current directory>\lUYI.ico
<Current directory>\RcMK.exe
C:\RCX4.tmp
<Current directory>\mgkQ.ico
<Current directory>\qIEY.exe
C:\RCX3.tmp
<Current directory>\mmkE.ico
<Current directory>\eEsO.exe
C:\RCX6.tmp
<Current directory>\JIMg.ico
<Current directory>\tAAS.exe
C:\RCX5.tmp
<Current directory>\VIkY.ico
C:\Documents and Settings\LocalService\NIMMEwsg\jaQEcQMQ
%ALLUSERSPROFILE%\casg.txt
%TEMP%\VyQwMEoc.bat
%HOMEPATH%\NIMMEwsg\jaQEcQMQ
%ALLUSERSPROFILE%\vesswIQA\AcIcUcAM
%ALLUSERSPROFILE%\lwQggIEM\nwAEcgMA.exe
<Current directory>\<Virus name>
<Current directory>\wwcs.ico
<Current directory>\BMwu.exe
C:\RCX2.tmp
<Current directory>\OcEQ.ico
<Current directory>\NMwi.exe
C:\RCX1.tmp
<Current directory>\LwkA.exe
<Current directory>\WIAo.ico
<Current directory>\qssO.exe
C:\RCXD.tmp
<Current directory>\FIog.ico
<Current directory>\PIkk.exe
C:\RCXC.tmp
<Current directory>\Pqcg.ico
<Current directory>\ycEO.exe
C:\RCXF.tmp
%TEMP%\oeMoYAsM.bat
<Current directory>\aEsc.exe
C:\RCXE.tmp
<Current directory>\Rwww.ico
C:\RCX8.tmp
<Current directory>\gmAc.ico
<Current directory>\aAUE.exe
C:\RCX7.tmp
<Current directory>\CkAA.ico
<Current directory>\KYYQ.exe
C:\RCX9.tmp
<Current directory>\zUoE.ico
<Current directory>\WEUc.exe
C:\RCXB.tmp
<Current directory>\rAIw.ico
<Current directory>\AgAi.exe
C:\RCXA.tmp

Deletes the following files:

<Current directory>\UCkM.ico
<Current directory>\cgYW.exe
<Current directory>\AkQk.ico
<Current directory>\yMAq.exe
<Current directory>\hqEY.ico
<Current directory>\eQoo.exe
<Current directory>\nakk.ico
<Current directory>\hYQW.exe
<Current directory>\Xooo.ico
<Current directory>\wsYU.exe
<Current directory>\JOUE.ico
<Current directory>\Ngoo.exe
<Current directory>\yMgo.ico
<Current directory>\rsww.exe
<Current directory>\gQEo.ico
<Current directory>\Gkwu.exe
<Current directory>\ryEc.ico
<Current directory>\ygUW.exe
<Current directory>\ggso.ico
<Current directory>\BMkw.ico
%TEMP%\sOMMYsAI.bat
<Current directory>\CsQA.exe
<Current directory>\osgo.ico
<Current directory>\NckM.exe
<Current directory>\dSUs.ico
%TEMP%\fWsMcwsA.bat
<Current directory>\nUsM.exe
<Current directory>\cwMU.exe
<Current directory>\Ukcg.ico
<Current directory>\ccEA.ico
<Current directory>\WcsE.exe
<Current directory>\hCMc.ico
<Current directory>\IEEW.exe
<Current directory>\mmkE.ico
<Current directory>\eEsO.exe
<Current directory>\lUYI.ico
<Current directory>\tAAS.exe
<Current directory>\JIMg.ico
<Current directory>\KYYQ.exe
<Current directory>\VIkY.ico
<Current directory>\LwkA.exe
<Current directory>\OcEQ.ico
<Current directory>\BMwu.exe
%TEMP%\VyQwMEoc.bat
<Current directory>\NMwi.exe
<Current directory>\mgkQ.ico
<Current directory>\RcMK.exe
<Current directory>\wwcs.ico
<Current directory>\qIEY.exe
<Current directory>\CkAA.ico
<Current directory>\aEsc.exe
<Current directory>\Pqcg.ico
<Current directory>\qssO.exe
<Current directory>\WIAo.ico
%TEMP%\oeMoYAsM.bat
<Current directory>\kIEQ.exe
<Current directory>\ycEO.exe
<Current directory>\Rwww.ico
<Current directory>\AgAi.exe
<Current directory>\rAIw.ico
<Current directory>\aAUE.exe
<Current directory>\gmAc.ico
<Current directory>\PIkk.exe
<Current directory>\FIog.ico
<Current directory>\WEUc.exe
<Current directory>\zUoE.ico

Moves the following files:

from C:\RCX15.tmp to <Current directory>\yMAq.exe
from C:\RCX16.tmp to <Current directory>\cgYW.exe
from C:\RCX17.tmp to <Current directory>\hYQW.exe
from C:\RCX14.tmp to <Current directory>\rsww.exe
from C:\RCX11.tmp to <Current directory>\Ngoo.exe
from C:\RCX12.tmp to <Current directory>\wsYU.exe
from C:\RCX13.tmp to <Current directory>\Gkwu.exe
from C:\RCX18.tmp to <Current directory>\eQoo.exe
from C:\RCX1D.tmp to <Current directory>\ygUW.exe
from C:\RCX1E.tmp to <Current directory>\NckM.exe
from C:\RCX1F.tmp to <Current directory>\CsQA.exe
from C:\RCX1C.tmp to <Current directory>\WcsE.exe
from C:\RCX19.tmp to <Current directory>\cwMU.exe
from C:\RCX1A.tmp to <Current directory>\nUsM.exe
from C:\RCX1B.tmp to <Current directory>\IEEW.exe
from C:\RCX10.tmp to <Current directory>\kIEQ.exe
from C:\RCX5.tmp to <Current directory>\tAAS.exe
from C:\RCX6.tmp to <Current directory>\eEsO.exe
from C:\RCX7.tmp to <Current directory>\LwkA.exe
from C:\RCX4.tmp to <Current directory>\RcMK.exe
from C:\RCX1.tmp to <Current directory>\NMwi.exe
from C:\RCX2.tmp to <Current directory>\BMwu.exe
from C:\RCX3.tmp to <Current directory>\qIEY.exe
from C:\RCX8.tmp to <Current directory>\KYYQ.exe
from C:\RCXD.tmp to <Current directory>\qssO.exe
from C:\RCXE.tmp to <Current directory>\aEsc.exe
from C:\RCXF.tmp to <Current directory>\ycEO.exe
from C:\RCXC.tmp to <Current directory>\PIkk.exe
from C:\RCX9.tmp to <Current directory>\aAUE.exe
from C:\RCXA.tmp to <Current directory>\AgAi.exe
from C:\RCXB.tmp to <Current directory>\WEUc.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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