Trojan.DownLoader12.25421

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%\zwwgQwgc.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\TmcQgMMg.bat" "<Full path to virus>""
'<SYSTEM32>\wbem\wmiadap.exe' /R /T
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\lMQIMEoQ.bat" "<Full path to virus>""
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\gOYkQIQg.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>\reg.exe' add HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /d 0 /t REG_DWORD /f
'<SYSTEM32>\cscript.exe' %TEMP%\file.vbs
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\IaMwckMc.bat" "<Full path to virus>""

Modifies file system :

Creates the following files:

<Current directory>\CUwc.exe
C:\RCX15.tmp
<Current directory>\yIsA.ico
<Current directory>\PgQS.exe
C:\RCX14.tmp
<Current directory>\cQQE.ico
<Current directory>\WMAC.exe
C:\RCX17.tmp
%TEMP%\HIYkYYUA.bat
%TEMP%\zwwgQwgc.bat
C:\RCX16.tmp
<Current directory>\QWcw.ico
<Current directory>\vAQG.exe
<Current directory>\XgAQ.ico
C:\RCX10.tmp
<Current directory>\DAAg.ico
<Current directory>\CUoc.exe
%TEMP%\TmcQgMMg.bat
<Current directory>\vuIw.ico
<Current directory>\XMUe.exe
C:\RCX11.tmp
<Current directory>\hcAw.ico
<Current directory>\ggsI.exe
C:\RCX13.tmp
<Current directory>\TEoU.ico
<Current directory>\hEgg.exe
C:\RCX12.tmp
<Current directory>\FSIU.ico
<Current directory>\wIcU.exe
C:\RCX1D.tmp
<Current directory>\KCUg.ico
<Current directory>\DIEy.exe
C:\RCX1C.tmp
<Current directory>\cGAE.ico
<Current directory>\HcQc.exe
<Current directory>\ocUE.exe
C:\RCX1F.tmp
%TEMP%\lMQIMEoQ.bat
C:\RCX1E.tmp
<Current directory>\cMIQ.ico
%TEMP%\CEMgAMgQ.bat
<Current directory>\giYc.ico
<Current directory>\jcYm.exe
C:\RCX19.tmp
<Current directory>\Jwgg.ico
<Current directory>\jkIW.exe
C:\RCX18.tmp
<Current directory>\PmIE.ico
<Current directory>\xgYg.exe
C:\RCX1B.tmp
%TEMP%\DgogMEQY.bat
%TEMP%\gOYkQIQg.bat
C:\RCX1A.tmp
<Current directory>\GiIg.ico
<Current directory>\cMAc.exe
C:\RCXF.tmp
<Current directory>\swwI.exe
C:\RCX4.tmp
<Current directory>\rioE.ico
<Current directory>\pIYG.exe
C:\RCX3.tmp
<Current directory>\JqYI.ico
<Current directory>\cAkQ.exe
C:\RCX6.tmp
<Current directory>\uCsk.ico
%TEMP%\VqYgwcME.bat
C:\RCX5.tmp
<Current directory>\tkoo.ico
<Current directory>\WYoQ.exe
<Current directory>\iCso.ico
C:\Documents and Settings\LocalService\NIMMEwsg\jaQEcQMQ
%ALLUSERSPROFILE%\casg.txt
<Current directory>\DIUk.ico
%HOMEPATH%\NIMMEwsg\jaQEcQMQ
%ALLUSERSPROFILE%\vesswIQA\AcIcUcAM
%ALLUSERSPROFILE%\lwQggIEM\nwAEcgMA.exe
%TEMP%\uKEkcUwk.bat
<Current directory>\LkQw.ico
<Current directory>\hscm.exe
C:\RCX2.tmp
<Current directory>\<Virus name>
<Current directory>\zMgG.exe
C:\RCX1.tmp
<Current directory>\oAok.exe
C:\RCXC.tmp
<Current directory>\cUso.ico
<Current directory>\LoYC.exe
C:\RCXB.tmp
<Current directory>\UKgs.ico
<Current directory>\DQsM.exe
C:\RCXD.tmp
C:\RCXE.tmp
<Current directory>\EWwM.ico
<Current directory>\VAgA.exe
%TEMP%\dEIAEcIg.bat
<Current directory>\UeEs.ico
<Current directory>\ycoA.exe
<Current directory>\TsEO.exe
<Current directory>\HMAE.ico
<Current directory>\agoY.exe
C:\RCX8.tmp
C:\RCX7.tmp
%TEMP%\IaMwckMc.bat
%TEMP%\file.vbs
<Current directory>\AgkI.ico
<Current directory>\mUMW.exe
C:\RCXA.tmp
<Current directory>\uIIE.ico
<Current directory>\ZYIu.exe
C:\RCX9.tmp
<Current directory>\FyIc.ico

Deletes the following files:

<Current directory>\CUwc.exe
<Current directory>\cQQE.ico
<Current directory>\PgQS.exe
<Current directory>\XgAQ.ico
%TEMP%\HIYkYYUA.bat
<Current directory>\vAQG.exe
<Current directory>\WMAC.exe
<Current directory>\yIsA.ico
<Current directory>\CUoc.exe
<Current directory>\DAAg.ico
<Current directory>\XMUe.exe
<Current directory>\vuIw.ico
<Current directory>\ggsI.exe
<Current directory>\hcAw.ico
<Current directory>\hEgg.exe
<Current directory>\TEoU.ico
<Current directory>\QWcw.ico
<Current directory>\giYc.ico
<Current directory>\wIcU.exe
<Current directory>\GiIg.ico
<Current directory>\DIEy.exe
<Current directory>\KCUg.ico
%TEMP%\CEMgAMgQ.bat
<Current directory>\cGAE.ico
<Current directory>\HcQc.exe
<Current directory>\jcYm.exe
<Current directory>\PmIE.ico
<Current directory>\jkIW.exe
<Current directory>\FSIU.ico
%TEMP%\DgogMEQY.bat
<Current directory>\cMAc.exe
<Current directory>\xgYg.exe
<Current directory>\Jwgg.ico
<Current directory>\rioE.ico
<Current directory>\WYoQ.exe
<Current directory>\JqYI.ico
<Current directory>\cAkQ.exe
<Current directory>\oAok.exe
<Current directory>\uCsk.ico
<Current directory>\tkoo.ico
%TEMP%\VqYgwcME.bat
<Current directory>\DIUk.ico
<Current directory>\hscm.exe
%TEMP%\uKEkcUwk.bat
<Current directory>\zMgG.exe
<Current directory>\iCso.ico
<Current directory>\swwI.exe
<Current directory>\LkQw.ico
<Current directory>\pIYG.exe
<Current directory>\agoY.exe
<Current directory>\cUso.ico
%TEMP%\dEIAEcIg.bat
<Current directory>\UKgs.ico
<Current directory>\LoYC.exe
<Current directory>\VAgA.exe
<Current directory>\EWwM.ico
<Current directory>\ycoA.exe
<Current directory>\UeEs.ico
<Current directory>\AgkI.ico
<Current directory>\mUMW.exe
<Current directory>\HMAE.ico
<Current directory>\ZYIu.exe
<Current directory>\uIIE.ico
<Current directory>\DQsM.exe
<Current directory>\FyIc.ico
<Current directory>\TsEO.exe

Moves the following files:

from C:\RCX14.tmp to <Current directory>\PgQS.exe
from C:\RCX15.tmp to <Current directory>\CUwc.exe
from C:\RCX16.tmp to <Current directory>\WMAC.exe
from C:\RCX13.tmp to <Current directory>\ggsI.exe
from C:\RCX10.tmp to <Current directory>\XMUe.exe
from C:\RCX11.tmp to <Current directory>\CUoc.exe
from C:\RCX12.tmp to <Current directory>\hEgg.exe
from C:\RCX17.tmp to <Current directory>\vAQG.exe
from C:\RCX1C.tmp to <Current directory>\DIEy.exe
from C:\RCX1D.tmp to <Current directory>\wIcU.exe
from C:\RCX1E.tmp to <Current directory>\HcQc.exe
from C:\RCX1B.tmp to <Current directory>\cMAc.exe
from C:\RCX18.tmp to <Current directory>\jkIW.exe
from C:\RCX19.tmp to <Current directory>\jcYm.exe
from C:\RCX1A.tmp to <Current directory>\xgYg.exe
from C:\RCX5.tmp to <Current directory>\cAkQ.exe
from C:\RCX6.tmp to <Current directory>\WYoQ.exe
from C:\RCX7.tmp to <Current directory>\oAok.exe
from C:\RCX4.tmp to <Current directory>\swwI.exe
from C:\RCX1.tmp to <Current directory>\zMgG.exe
from C:\RCX2.tmp to <Current directory>\hscm.exe
from C:\RCX3.tmp to <Current directory>\pIYG.exe
from C:\RCX8.tmp to <Current directory>\agoY.exe
from C:\RCXD.tmp to <Current directory>\LoYC.exe
from C:\RCXE.tmp to <Current directory>\ycoA.exe
from C:\RCXF.tmp to <Current directory>\VAgA.exe
from C:\RCXC.tmp to <Current directory>\DQsM.exe
from C:\RCX9.tmp to <Current directory>\ZYIu.exe
from C:\RCXA.tmp to <Current directory>\mUMW.exe
from C:\RCXB.tmp to <Current directory>\TsEO.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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