Trojan.DownLoader12.31802

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%\PIcYkQAs.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\acUQYAIA.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\FmEMAkoY.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\qEsMcAoc.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\aOUgMkQU.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\iwMkQwcg.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\wuIsYkgw.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%\TGswEUUk.bat" "<Full path to virus>""
'<SYSTEM32>\cscript.exe' %TEMP%\file.vbs
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\MOcUMMMc.bat" "<Full path to virus>""

Modifies file system :

Creates the following files:

C:\RCX10.tmp
<Current directory>\aIoA.ico
<Current directory>\IEIs.exe
C:\RCXF.tmp
<Current directory>\lYYs.ico
<Current directory>\JkYE.exe
<Current directory>\VMog.exe
C:\RCX12.tmp
%TEMP%\iwMkQwcg.bat
C:\RCX11.tmp
%TEMP%\eMgoIUEU.bat
<Current directory>\HwUo.ico
<Current directory>\YEsA.exe
C:\RCXC.tmp
<Current directory>\dGww.ico
<Current directory>\DMAG.exe
<Current directory>\cUAw.ico
<Current directory>\YYoy.exe
%TEMP%\KMwQcwcA.bat
<Current directory>\lAIK.exe
C:\RCXE.tmp
<Current directory>\GYEE.ico
C:\RCXD.tmp
%TEMP%\PIcYkQAs.bat
<Current directory>\AYkI.ico
C:\RCX17.tmp
<Current directory>\ggsg.ico
<Current directory>\FoUg.exe
C:\RCX16.tmp
<Current directory>\Zqcc.ico
<Current directory>\gwEw.exe
<Current directory>\UocA.ico
<Current directory>\TMUK.exe
C:\RCX19.tmp
%TEMP%\LWMQsMUg.bat
C:\RCX18.tmp
%TEMP%\qEsMcAoc.bat
<Current directory>\Kcoi.exe
<Current directory>\bSUY.ico
<Current directory>\iokm.exe
C:\RCX14.tmp
<Current directory>\AOsM.ico
<Current directory>\DoAi.exe
C:\RCX13.tmp
C:\RCX15.tmp
%TEMP%\aOUgMkQU.bat
<Current directory>\jUYk.ico
<Current directory>\VUMs.ico
%TEMP%\FKQocgkg.bat
<Current directory>\dgQK.exe
%TEMP%\wuIsYkgw.bat
%TEMP%\woYYsEcs.bat
<Current directory>\OMAM.exe
%TEMP%\FqgwAsUY.bat
%TEMP%\TGswEUUk.bat
%TEMP%\AsMgAQMI.bat
<Current directory>\SAck.exe
C:\RCX3.tmp
<Current directory>\pSwA.ico
C:\RCX2.tmp
%TEMP%\FmEMAkoY.bat
<Current directory>\CuQw.ico
<Current directory>\gWcE.ico
%ALLUSERSPROFILE%\casg.txt
C:\Documents and Settings\LocalService\NIMMEwsg\jaQEcQMQ
<Current directory>\DWQc.ico
%HOMEPATH%\NIMMEwsg\jaQEcQMQ
%ALLUSERSPROFILE%\vesswIQA\AcIcUcAM
%ALLUSERSPROFILE%\lwQggIEM\nwAEcgMA.exe
<Current directory>\BsMY.exe
C:\RCX1.tmp
%TEMP%\file.vbs
%TEMP%\Ssogkoww.bat
<Current directory>\<Virus name>
%TEMP%\MOcUMMMc.bat
<Current directory>\vCgE.ico
<Current directory>\fkkm.exe
C:\RCX9.tmp
<Current directory>\bmUU.ico
<Current directory>\VAQW.exe
C:\RCX8.tmp
<Current directory>\rGcg.ico
<Current directory>\JgQy.exe
C:\RCXB.tmp
<Current directory>\UWEQ.ico
<Current directory>\kUgs.exe
C:\RCXA.tmp
C:\RCX7.tmp
<Current directory>\YAcs.ico
<Current directory>\QIcI.exe
C:\RCX5.tmp
<Current directory>\PEwq.exe
C:\RCX4.tmp
%TEMP%\AKogYQAU.bat
%TEMP%\acUQYAIA.bat
<Current directory>\OgYE.ico
<Current directory>\fsoK.exe
<Current directory>\fYsg.ico
<Current directory>\vsMm.exe
C:\RCX6.tmp

Deletes the following files:

<Current directory>\aIoA.ico
<Current directory>\IEIs.exe
<Current directory>\lYYs.ico
%TEMP%\eMgoIUEU.bat
<Current directory>\DoAi.exe
<Current directory>\HwUo.ico
<Current directory>\VMog.exe
<Current directory>\lAIK.exe
<Current directory>\dGww.ico
<Current directory>\DMAG.exe
<Current directory>\AYkI.ico
<Current directory>\JkYE.exe
<Current directory>\GYEE.ico
<Current directory>\YEsA.exe
<Current directory>\AOsM.ico
%TEMP%\LWMQsMUg.bat
<Current directory>\Zqcc.ico
<Current directory>\gwEw.exe
<Current directory>\FoUg.exe
<Current directory>\UocA.ico
<Current directory>\TMUK.exe
<Current directory>\ggsg.ico
%TEMP%\FKQocgkg.bat
<Current directory>\bSUY.ico
<Current directory>\iokm.exe
<Current directory>\dgQK.exe
<Current directory>\jUYk.ico
<Current directory>\Kcoi.exe
<Current directory>\VUMs.ico
<Current directory>\cUAw.ico
<Current directory>\CuQw.ico
<Current directory>\SAck.exe
<Current directory>\gWcE.ico
<Current directory>\PEwq.exe
<Current directory>\QIcI.exe
%TEMP%\AKogYQAU.bat
<Current directory>\pSwA.ico
<Current directory>\DWQc.ico
<Current directory>\BsMY.exe
%TEMP%\Ssogkoww.bat
%TEMP%\FqgwAsUY.bat
<Current directory>\OMAM.exe
%TEMP%\woYYsEcs.bat
%TEMP%\AsMgAQMI.bat
<Current directory>\YAcs.ico
<Current directory>\UWEQ.ico
<Current directory>\kUgs.exe
<Current directory>\vCgE.ico
<Current directory>\JgQy.exe
<Current directory>\YYoy.exe
%TEMP%\KMwQcwcA.bat
<Current directory>\rGcg.ico
<Current directory>\fsoK.exe
<Current directory>\fYsg.ico
<Current directory>\vsMm.exe
<Current directory>\OgYE.ico
<Current directory>\fkkm.exe
<Current directory>\bmUU.ico
<Current directory>\VAQW.exe

Moves the following files:

from C:\RCX11.tmp to <Current directory>\IEIs.exe
from C:\RCX12.tmp to <Current directory>\VMog.exe
from C:\RCX13.tmp to <Current directory>\DoAi.exe
from C:\RCXE.tmp to <Current directory>\lAIK.exe
from C:\RCXF.tmp to <Current directory>\YEsA.exe
from C:\RCX10.tmp to <Current directory>\JkYE.exe
from C:\RCX17.tmp to <Current directory>\gwEw.exe
from C:\RCX18.tmp to <Current directory>\FoUg.exe
from C:\RCX19.tmp to <Current directory>\TMUK.exe
from C:\RCX14.tmp to <Current directory>\iokm.exe
from C:\RCX15.tmp to <Current directory>\dgQK.exe
from C:\RCX16.tmp to <Current directory>\Kcoi.exe
from C:\RCXD.tmp to <Current directory>\DMAG.exe
from C:\RCX4.tmp to <Current directory>\PEwq.exe
from C:\RCX5.tmp to <Current directory>\QIcI.exe
from C:\RCX6.tmp to <Current directory>\vsMm.exe
from C:\RCX1.tmp to <Current directory>\BsMY.exe
from C:\RCX2.tmp to <Current directory>\OMAM.exe
from C:\RCX3.tmp to <Current directory>\SAck.exe
from C:\RCXA.tmp to <Current directory>\kUgs.exe
from C:\RCXB.tmp to <Current directory>\JgQy.exe
from C:\RCXC.tmp to <Current directory>\YYoy.exe
from C:\RCX7.tmp to <Current directory>\fsoK.exe
from C:\RCX8.tmp to <Current directory>\VAQW.exe
from C:\RCX9.tmp to <Current directory>\fkkm.exe

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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