Trojan.DownLoader12.31807

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%\eocIwMEQ.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\mkQssMIo.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\vUMIgQMA.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\voEMIEkE.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\RIUsIQAM.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\mqYsYIAc.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\NIwUwccg.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%\ccAAAoII.bat" "<Full path to virus>""
'<SYSTEM32>\cscript.exe' %TEMP%\file.vbs
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\WUgwcoAc.bat" "<Full path to virus>""

Modifies file system :

Creates the following files:

<Current directory>\WUYO.exe
C:\RCX13.tmp
<Current directory>\fcME.ico
<Current directory>\uaMw.ico
<Current directory>\uAYw.ico
<Current directory>\tQgs.exe
C:\RCX12.tmp
<Current directory>\RgIq.exe
<Current directory>\KOAg.ico
<Current directory>\NMci.exe
C:\RCX16.tmp
C:\RCX15.tmp
C:\RCX14.tmp
<Current directory>\IWww.ico
<Current directory>\xwkI.exe
<Current directory>\JEMe.exe
C:\RCXE.tmp
<Current directory>\OaIY.ico
<Current directory>\aYgg.ico
<Current directory>\gIAQ.ico
<Current directory>\DIYq.exe
C:\RCXD.tmp
<Current directory>\fYAs.exe
<Current directory>\YOIw.ico
<Current directory>\noQS.exe
C:\RCX11.tmp
C:\RCX10.tmp
C:\RCXF.tmp
<Current directory>\WeQg.ico
<Current directory>\SUYg.exe
<Current directory>\KaoA.ico
C:\RCX1D.tmp
<Current directory>\HAEM.ico
<Current directory>\kQkc.exe
<Current directory>\LkEy.exe
<Current directory>\DMUS.exe
C:\RCX1C.tmp
<Current directory>\ZGsQ.ico
C:\RCX1E.tmp
<Current directory>\EoYA.exe
<Current directory>\tYsY.ico
<Current directory>\tgYa.exe
<Current directory>\RKoA.ico
<Current directory>\eSoQ.ico
<Current directory>\YoMi.exe
C:\RCX1F.tmp
C:\RCX18.tmp
<Current directory>\MuYs.ico
<Current directory>\XgAC.exe
<Current directory>\OUEC.exe
<Current directory>\qkAE.exe
C:\RCX17.tmp
<Current directory>\DUwU.ico
C:\RCX19.tmp
<Current directory>\doMc.exe
C:\RCX1B.tmp
<Current directory>\Iggk.ico
<Current directory>\POwY.ico
<Current directory>\WQoE.ico
<Current directory>\JkYC.exe
C:\RCX1A.tmp
<Current directory>\MaMk.ico
<Current directory>\YAYK.exe
C:\RCX3.tmp
%TEMP%\NIwUwccg.bat
<Current directory>\xIMk.exe
C:\RCX2.tmp
%TEMP%\QegsYEkk.bat
<Current directory>\ZqsM.ico
<Current directory>\UeYM.ico
<Current directory>\Msgs.exe
C:\RCX5.tmp
%TEMP%\vUMIgQMA.bat
<Current directory>\CkAs.exe
%TEMP%\wEgIQgAw.bat
C:\RCX4.tmp
C:\Documents and Settings\LocalService\NIMMEwsg\jaQEcQMQ
%TEMP%\XesUIUwQ.bat
<Current directory>\<Virus name>
%ALLUSERSPROFILE%\casg.txt
%HOMEPATH%\NIMMEwsg\jaQEcQMQ
%ALLUSERSPROFILE%\vesswIQA\AcIcUcAM
%ALLUSERSPROFILE%\lwQggIEM\nwAEcgMA.exe
<Current directory>\neos.ico
%TEMP%\ruMgUcko.bat
<Current directory>\KaUM.ico
%TEMP%\ccAAAoII.bat
%TEMP%\file.vbs
%TEMP%\WUgwcoAc.bat
<Current directory>\CQsy.exe
C:\RCX1.tmp
%TEMP%\nqUwcswM.bat
<Current directory>\ssEO.exe
%TEMP%\RIUsIQAM.bat
C:\RCXA.tmp
<Current directory>\KsEs.ico
<Current directory>\WgoU.exe
C:\RCX9.tmp
%TEMP%\TmwAQwUI.bat
<Current directory>\ksEo.ico
<Current directory>\pYog.ico
<Current directory>\wMYs.exe
C:\RCXC.tmp
%TEMP%\voEMIEkE.bat
<Current directory>\SokE.exe
C:\RCXB.tmp
%TEMP%\voMAUcUg.bat
%TEMP%\auEEIcYo.bat
%TEMP%\eocIwMEQ.bat
<Current directory>\nYcM.ico
C:\RCX6.tmp
%TEMP%\mkQssMIo.bat
<Current directory>\cywA.ico
<Current directory>\DoEC.exe
<Current directory>\aYgw.exe
C:\RCX8.tmp
%TEMP%\mqYsYIAc.bat
<Current directory>\hGEQ.ico
%TEMP%\kMMggsQw.bat
C:\RCX7.tmp
<Current directory>\DkEY.ico
<Current directory>\Yssa.exe

Deletes the following files:

<Current directory>\RgIq.exe
<Current directory>\fcME.ico
<Current directory>\WUYO.exe
<Current directory>\uaMw.ico
<Current directory>\xwkI.exe
<Current directory>\KOAg.ico
<Current directory>\qkAE.exe
<Current directory>\IWww.ico
<Current directory>\NMci.exe
<Current directory>\OaIY.ico
<Current directory>\SUYg.exe
<Current directory>\aYgg.ico
<Current directory>\fYAs.exe
<Current directory>\WeQg.ico
<Current directory>\tQgs.exe
<Current directory>\uAYw.ico
<Current directory>\noQS.exe
<Current directory>\YOIw.ico
<Current directory>\LkEy.exe
<Current directory>\ZGsQ.ico
<Current directory>\DMUS.exe
<Current directory>\Iggk.ico
<Current directory>\kQkc.exe
<Current directory>\eSoQ.ico
<Current directory>\RKoA.ico
<Current directory>\HAEM.ico
<Current directory>\YoMi.exe
<Current directory>\DUwU.ico
<Current directory>\XgAC.exe
<Current directory>\KaoA.ico
<Current directory>\OUEC.exe
<Current directory>\MuYs.ico
<Current directory>\doMc.exe
<Current directory>\POwY.ico
<Current directory>\JkYC.exe
<Current directory>\WQoE.ico
<Current directory>\ZqsM.ico
%TEMP%\nqUwcswM.bat
%TEMP%\wEgIQgAw.bat
<Current directory>\CkAs.exe
<Current directory>\Msgs.exe
<Current directory>\DoEC.exe
<Current directory>\cywA.ico
<Current directory>\UeYM.ico
%TEMP%\auEEIcYo.bat
<Current directory>\neos.ico
%TEMP%\ruMgUcko.bat
%TEMP%\XesUIUwQ.bat
<Current directory>\CQsy.exe
%TEMP%\QegsYEkk.bat
<Current directory>\YAYK.exe
<Current directory>\MaMk.ico
<Current directory>\xIMk.exe
<Current directory>\KaUM.ico
<Current directory>\SokE.exe
<Current directory>\ksEo.ico
<Current directory>\KsEs.ico
%TEMP%\voMAUcUg.bat
<Current directory>\wMYs.exe
<Current directory>\gIAQ.ico
<Current directory>\JEMe.exe
<Current directory>\pYog.ico
<Current directory>\DIYq.exe
%TEMP%\kMMggsQw.bat
<Current directory>\Yssa.exe
<Current directory>\aYgw.exe
<Current directory>\nYcM.ico
<Current directory>\DkEY.ico
<Current directory>\hGEQ.ico
<Current directory>\ssEO.exe
<Current directory>\WgoU.exe
%TEMP%\TmwAQwUI.bat

Moves the following files:

from C:\RCX15.tmp to <Current directory>\xwkI.exe
from C:\RCX16.tmp to <Current directory>\NMci.exe
from C:\RCX17.tmp to <Current directory>\qkAE.exe
from C:\RCX14.tmp to <Current directory>\RgIq.exe
from C:\RCX11.tmp to <Current directory>\noQS.exe
from C:\RCX12.tmp to <Current directory>\tQgs.exe
from C:\RCX13.tmp to <Current directory>\WUYO.exe
from C:\RCX18.tmp to <Current directory>\OUEC.exe
from C:\RCX1D.tmp to <Current directory>\LkEy.exe
from C:\RCX1E.tmp to <Current directory>\kQkc.exe
from C:\RCX1F.tmp to <Current directory>\YoMi.exe
from C:\RCX1C.tmp to <Current directory>\DMUS.exe
from C:\RCX19.tmp to <Current directory>\XgAC.exe
from C:\RCX1A.tmp to <Current directory>\JkYC.exe
from C:\RCX1B.tmp to <Current directory>\doMc.exe
from C:\RCX10.tmp to <Current directory>\SUYg.exe
from C:\RCX5.tmp to <Current directory>\Msgs.exe
from C:\RCX6.tmp to <Current directory>\DoEC.exe
from C:\RCX7.tmp to <Current directory>\aYgw.exe
from C:\RCX4.tmp to <Current directory>\CkAs.exe
from C:\RCX1.tmp to <Current directory>\CQsy.exe
from C:\RCX2.tmp to <Current directory>\xIMk.exe
from C:\RCX3.tmp to <Current directory>\YAYK.exe
from C:\RCX8.tmp to <Current directory>\Yssa.exe
from C:\RCXD.tmp to <Current directory>\DIYq.exe
from C:\RCXE.tmp to <Current directory>\JEMe.exe
from C:\RCXF.tmp to <Current directory>\fYAs.exe
from C:\RCXC.tmp to <Current directory>\wMYs.exe
from C:\RCX9.tmp to <Current directory>\WgoU.exe
from C:\RCXA.tmp to <Current directory>\ssEO.exe
from C:\RCXB.tmp to <Current directory>\SokE.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: 'Microsoft Windows'
ClassName: '' WindowName: 'jaQEcQMQ.exe'
ClassName: 'Indicator' WindowName: ''
ClassName: '' WindowName: 'AcIcUcAM.exe'

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