Trojan.DownLoader12.31797

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%\hOQsYQEM.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\vCYUEcYI.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\pOQUkkMM.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\UwEwgoUw.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\zkkEwUkY.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\xuMcMssk.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\vsUsoYEI.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%\suIwcUIQ.bat" "<Full path to virus>""
'<SYSTEM32>\cscript.exe' %TEMP%\file.vbs
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\TucYkwQY.bat" "<Full path to virus>""

Modifies file system :

Creates the following files:

C:\RCX14.tmp
%TEMP%\bOgcowoc.bat
<Current directory>\qMsI.ico
<Current directory>\RoMu.exe
<Current directory>\acQy.exe
C:\RCX13.tmp
<Current directory>\mIYE.ico
<Current directory>\lUEy.exe
C:\RCX16.tmp
<Current directory>\UCwE.ico
<Current directory>\AMgY.ico
<Current directory>\bUQY.exe
C:\RCX15.tmp
%TEMP%\xuMcMssk.bat
<Current directory>\QegA.ico
<Current directory>\LkES.exe
C:\RCX10.tmp
<Current directory>\JkgI.ico
<Current directory>\DSwk.ico
<Current directory>\XyYU.ico
<Current directory>\Kkka.exe
C:\RCXF.tmp
<Current directory>\hIQq.exe
C:\RCX12.tmp
%TEMP%\hOQsYQEM.bat
<Current directory>\bQYs.ico
<Current directory>\wIwO.exe
C:\RCX11.tmp
%TEMP%\DIgYYMEU.bat
<Current directory>\AkoO.exe
%TEMP%\wKUMsggA.bat
C:\RCX1C.tmp
%TEMP%\LcgsEwIU.bat
<Current directory>\tIAM.exe
<Current directory>\UUIE.exe
C:\RCX1B.tmp
<Current directory>\wGwU.ico
<Current directory>\GQIg.exe
<Current directory>\VKIA.ico
<Current directory>\uwMw.exe
<Current directory>\XSIc.ico
<Current directory>\Jkso.ico
<Current directory>\eEIi.exe
C:\RCX1D.tmp
%TEMP%\UwEwgoUw.bat
%TEMP%\oWcYMwQw.bat
<Current directory>\UuQY.ico
<Current directory>\QkkI.exe
C:\RCX18.tmp
C:\RCX17.tmp
<Current directory>\xCIU.ico
<Current directory>\VwAM.exe
C:\RCX1A.tmp
%TEMP%\eEYooEcM.bat
<Current directory>\oOIc.ico
<Current directory>\rgYM.exe
C:\RCX19.tmp
%TEMP%\zkkEwUkY.bat
<Current directory>\vmcw.ico
%TEMP%\suIwcUIQ.bat
<Current directory>\xswQ.ico
<Current directory>\QYcg.exe
C:\RCX3.tmp
%TEMP%\UyoccEUA.bat
<Current directory>\VAYs.ico
<Current directory>\dcEA.exe
%TEMP%\VMgMoYkA.bat
<Current directory>\ycgM.ico
<Current directory>\lcsE.exe
C:\RCX5.tmp
C:\RCX4.tmp
<Current directory>\AmUc.ico
<Current directory>\oEMs.exe
C:\RCX2.tmp
C:\Documents and Settings\LocalService\NIMMEwsg\jaQEcQMQ
%TEMP%\kwwAYsUs.bat
<Current directory>\<Virus name>
%ALLUSERSPROFILE%\casg.txt
%HOMEPATH%\NIMMEwsg\jaQEcQMQ
%ALLUSERSPROFILE%\vesswIQA\AcIcUcAM
%ALLUSERSPROFILE%\lwQggIEM\nwAEcgMA.exe
%TEMP%\file.vbs
<Current directory>\EUoM.ico
<Current directory>\aQce.exe
%TEMP%\TucYkwQY.bat
<Current directory>\UAMM.ico
<Current directory>\KUYg.exe
C:\RCX1.tmp
%TEMP%\vsUsoYEI.bat
<Current directory>\byYg.ico
<Current directory>\Xooo.exe
C:\RCXC.tmp
%TEMP%\ViMwkwsQ.bat
<Current directory>\iigQ.ico
<Current directory>\VcQo.exe
C:\RCXB.tmp
<Current directory>\xEEE.ico
<Current directory>\Ygcc.exe
C:\RCXE.tmp
%TEMP%\vCYUEcYI.bat
<Current directory>\cakQ.ico
<Current directory>\tAYi.exe
C:\RCXD.tmp
C:\RCXA.tmp
%TEMP%\DQYwoYMA.bat
<Current directory>\sKMM.ico
<Current directory>\Boca.exe
C:\RCX7.tmp
C:\RCX6.tmp
<Current directory>\yGoI.ico
<Current directory>\NUEI.exe
C:\RCX9.tmp
<Current directory>\CeIw.ico
<Current directory>\LoMU.exe
<Current directory>\bcUE.exe
C:\RCX8.tmp
%TEMP%\pOQUkkMM.bat
<Current directory>\DWww.ico

Deletes the following files:

%TEMP%\bOgcowoc.bat
<Current directory>\bUQY.exe
<Current directory>\RoMu.exe
<Current directory>\mIYE.ico
<Current directory>\AMgY.ico
<Current directory>\AkoO.exe
<Current directory>\qMsI.ico
<Current directory>\lUEy.exe
<Current directory>\QegA.ico
<Current directory>\wIwO.exe
<Current directory>\JkgI.ico
<Current directory>\LkES.exe
<Current directory>\DSwk.ico
<Current directory>\bQYs.ico
<Current directory>\acQy.exe
%TEMP%\DIgYYMEU.bat
<Current directory>\hIQq.exe
%TEMP%\wKUMsggA.bat
<Current directory>\tIAM.exe
<Current directory>\UUIE.exe
<Current directory>\oOIc.ico
<Current directory>\Jkso.ico
<Current directory>\XSIc.ico
<Current directory>\wGwU.ico
<Current directory>\eEIi.exe
<Current directory>\vmcw.ico
<Current directory>\xCIU.ico
%TEMP%\oWcYMwQw.bat
<Current directory>\UCwE.ico
<Current directory>\VwAM.exe
%TEMP%\eEYooEcM.bat
<Current directory>\rgYM.exe
<Current directory>\QkkI.exe
<Current directory>\UuQY.ico
<Current directory>\XyYU.ico
<Current directory>\oEMs.exe
<Current directory>\AmUc.ico
<Current directory>\xswQ.ico
%TEMP%\VMgMoYkA.bat
<Current directory>\NUEI.exe
%TEMP%\DQYwoYMA.bat
<Current directory>\lcsE.exe
<Current directory>\ycgM.ico
<Current directory>\QYcg.exe
<Current directory>\UAMM.ico
<Current directory>\aQce.exe
%TEMP%\kwwAYsUs.bat
<Current directory>\KUYg.exe
<Current directory>\dcEA.exe
<Current directory>\VAYs.ico
%TEMP%\UyoccEUA.bat
<Current directory>\EUoM.ico
<Current directory>\byYg.ico
<Current directory>\tAYi.exe
%TEMP%\ViMwkwsQ.bat
<Current directory>\Xooo.exe
<Current directory>\xEEE.ico
<Current directory>\Kkka.exe
<Current directory>\cakQ.ico
<Current directory>\Ygcc.exe
<Current directory>\iigQ.ico
<Current directory>\sKMM.ico
<Current directory>\bcUE.exe
<Current directory>\yGoI.ico
<Current directory>\Boca.exe
<Current directory>\CeIw.ico
<Current directory>\VcQo.exe
<Current directory>\DWww.ico
<Current directory>\LoMU.exe

Moves the following files:

from C:\RCX14.tmp to <Current directory>\RoMu.exe
from C:\RCX15.tmp to <Current directory>\bUQY.exe
from C:\RCX16.tmp to <Current directory>\lUEy.exe
from C:\RCX13.tmp to <Current directory>\acQy.exe
from C:\RCX10.tmp to <Current directory>\LkES.exe
from C:\RCX11.tmp to <Current directory>\wIwO.exe
from C:\RCX12.tmp to <Current directory>\hIQq.exe
from C:\RCX1B.tmp to <Current directory>\UUIE.exe
from C:\RCX1C.tmp to <Current directory>\tIAM.exe
from C:\RCX1D.tmp to <Current directory>\eEIi.exe
from C:\RCX1A.tmp to <Current directory>\rgYM.exe
from C:\RCX17.tmp to <Current directory>\AkoO.exe
from C:\RCX18.tmp to <Current directory>\VwAM.exe
from C:\RCX19.tmp to <Current directory>\QkkI.exe
from C:\RCXF.tmp to <Current directory>\Kkka.exe
from C:\RCX5.tmp to <Current directory>\oEMs.exe
from C:\RCX6.tmp to <Current directory>\lcsE.exe
from C:\RCX7.tmp to <Current directory>\NUEI.exe
from C:\RCX4.tmp to <Current directory>\QYcg.exe
from C:\RCX1.tmp to <Current directory>\KUYg.exe
from C:\RCX2.tmp to <Current directory>\aQce.exe
from C:\RCX3.tmp to <Current directory>\dcEA.exe
from C:\RCXC.tmp to <Current directory>\Xooo.exe
from C:\RCXD.tmp to <Current directory>\tAYi.exe
from C:\RCXE.tmp to <Current directory>\Ygcc.exe
from C:\RCXB.tmp to <Current directory>\VcQo.exe
from C:\RCX8.tmp to <Current directory>\Boca.exe
from C:\RCX9.tmp to <Current directory>\bcUE.exe
from C:\RCXA.tmp to <Current directory>\LoMU.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'

Technologies

Terminology

Training and education

Myths

Technical Information

Curing recommendations

Free trial