Trojan.DownLoader12.25408

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'
'%TEMP%\sro_client.exe'
'%HOMEPATH%\NIMMEwsg\jaQEcQMQ.exe'
'%ALLUSERSPROFILE%\vesswIQA\AcIcUcAM.exe'

Executes the following:

'<SYSTEM32>\reg.exe' add HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /d 0 /t REG_DWORD /f
'<SYSTEM32>\wbem\wmiadap.exe' /R /T
'<SYSTEM32>\reg.exe' add HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced /f /v HideFileExt /t REG_DWORD /d 1
'<SYSTEM32>\reg.exe' add HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced /f /v Hidden /t REG_DWORD /d 2

Modifies file system :

Creates the following files:

<Current directory>\vmEU.ico
<Current directory>\FQAM.exe
C:\RCX15.tmp
<Current directory>\NKMI.ico
<Current directory>\ZooO.exe
C:\RCX14.tmp
<Current directory>\EIkg.ico
<Current directory>\rskm.exe
C:\RCX17.tmp
<Current directory>\NUkk.ico
<Current directory>\zAss.exe
C:\RCX16.tmp
C:\RCX13.tmp
C:\RCX10.tmp
<Current directory>\tSEU.ico
<Current directory>\uEwE.exe
C:\RCXF.tmp
<Current directory>\GQMI.ico
<Current directory>\BssY.exe
C:\RCX12.tmp
<Current directory>\EqUA.ico
<Current directory>\zYMI.exe
C:\RCX11.tmp
<Current directory>\jugk.ico
<Current directory>\PMwK.exe
<Current directory>\XWMs.ico
<Current directory>\nUQI.ico
<Current directory>\HwsY.exe
C:\RCX1E.tmp
<Current directory>\Rugg.ico
<Current directory>\gsIw.exe
C:\RCX1D.tmp
<Current directory>\TWow.ico
<Current directory>\fEwi.exe
C:\RCX20.tmp
<Current directory>\xaQU.ico
<Current directory>\Wkky.exe
C:\RCX1F.tmp
C:\RCX1C.tmp
<Current directory>\kQYY.exe
C:\RCX19.tmp
<Current directory>\Dkgg.ico
<Current directory>\Ksgu.exe
C:\RCX18.tmp
<Current directory>\qmwg.ico
C:\RCX1B.tmp
<Current directory>\JygQ.ico
<Current directory>\jIES.exe
C:\RCX1A.tmp
<Current directory>\VAEY.ico
<Current directory>\lQYQ.exe
<Current directory>\BMcg.ico
<Current directory>\isYo.exe
C:\RCX4.tmp
<Current directory>\BAcY.ico
<Current directory>\LEIO.exe
C:\RCX3.tmp
<Current directory>\YQEU.ico
<Current directory>\WIAy.exe
C:\RCX6.tmp
<Current directory>\Qysg.ico
<Current directory>\zIcS.exe
C:\RCX5.tmp
C:\RCX2.tmp
C:\Documents and Settings\LocalService\NIMMEwsg\jaQEcQMQ
%ALLUSERSPROFILE%\casg.txt
%TEMP%\CuQQIEQs.bat
%HOMEPATH%\NIMMEwsg\jaQEcQMQ
%ALLUSERSPROFILE%\vesswIQA\AcIcUcAM
%ALLUSERSPROFILE%\lwQggIEM\nwAEcgMA.exe
C:\RCX1.tmp
<Current directory>\Lios.ico
<Current directory>\VgwY.exe
%TEMP%\sro_client.exe
<Current directory>\cGQc.ico
<Current directory>\UQQA.exe
<Current directory>\tSwM.ico
C:\RCXC.tmp
<Current directory>\aKIg.ico
<Current directory>\qAkI.exe
C:\RCXB.tmp
<Current directory>\xmIQ.ico
<Current directory>\BoMa.exe
C:\RCXE.tmp
<Current directory>\uUkw.ico
<Current directory>\sIYg.exe
C:\RCXD.tmp
<Current directory>\eKIE.ico
<Current directory>\tsIq.exe
<Current directory>\SsYc.exe
<Current directory>\nocC.exe
C:\RCX8.tmp
<Current directory>\pKYI.ico
<Current directory>\vAIG.exe
C:\RCX7.tmp
<Current directory>\FicA.ico
<Current directory>\joIc.exe
C:\RCXA.tmp
<Current directory>\eMMk.ico
<Current directory>\esEq.exe
C:\RCX9.tmp
<Current directory>\hOIE.ico

Deletes the following files:

<Current directory>\vmEU.ico
<Current directory>\FQAM.exe
<Current directory>\NKMI.ico
<Current directory>\zAss.exe
<Current directory>\EIkg.ico
<Current directory>\rskm.exe
<Current directory>\NUkk.ico
<Current directory>\ZooO.exe
<Current directory>\tSEU.ico
<Current directory>\uEwE.exe
<Current directory>\GQMI.ico
<Current directory>\PMwK.exe
<Current directory>\EqUA.ico
<Current directory>\zYMI.exe
<Current directory>\jugk.ico
<Current directory>\Ksgu.exe
<Current directory>\HwsY.exe
<Current directory>\Rugg.ico
<Current directory>\gsIw.exe
<Current directory>\nUQI.ico
<Current directory>\fEwi.exe
<Current directory>\xaQU.ico
<Current directory>\Wkky.exe
<Current directory>\JygQ.ico
<Current directory>\qmwg.ico
<Current directory>\kQYY.exe
<Current directory>\XWMs.ico
<Current directory>\Dkgg.ico
<Current directory>\jIES.exe
<Current directory>\VAEY.ico
<Current directory>\lQYQ.exe
<Current directory>\BssY.exe
<Current directory>\Qysg.ico
<Current directory>\zIcS.exe
<Current directory>\BMcg.ico
<Current directory>\WIAy.exe
<Current directory>\tSwM.ico
<Current directory>\vAIG.exe
<Current directory>\YQEU.ico
<Current directory>\isYo.exe
<Current directory>\cGQc.ico
<Current directory>\UQQA.exe
%TEMP%\CuQQIEQs.bat
<Current directory>\VgwY.exe
<Current directory>\BAcY.ico
<Current directory>\LEIO.exe
<Current directory>\Lios.ico
<Current directory>\nocC.exe
<Current directory>\aKIg.ico
<Current directory>\qAkI.exe
<Current directory>\xmIQ.ico
<Current directory>\tsIq.exe
<Current directory>\uUkw.ico
<Current directory>\sIYg.exe
<Current directory>\eKIE.ico
<Current directory>\BoMa.exe
<Current directory>\pKYI.ico
<Current directory>\esEq.exe
<Current directory>\FicA.ico
<Current directory>\joIc.exe
<Current directory>\eMMk.ico
<Current directory>\SsYc.exe
<Current directory>\hOIE.ico

Moves the following files:

from C:\RCX16.tmp to <Current directory>\zAss.exe
from C:\RCX15.tmp to <Current directory>\FQAM.exe
from C:\RCX18.tmp to <Current directory>\Ksgu.exe
from C:\RCX17.tmp to <Current directory>\rskm.exe
from C:\RCX12.tmp to <Current directory>\PMwK.exe
from C:\RCX11.tmp to <Current directory>\uEwE.exe
from C:\RCX14.tmp to <Current directory>\ZooO.exe
from C:\RCX13.tmp to <Current directory>\zYMI.exe
from C:\RCX1E.tmp to <Current directory>\HwsY.exe
from C:\RCX1D.tmp to <Current directory>\gsIw.exe
from C:\RCX20.tmp to <Current directory>\fEwi.exe
from C:\RCX1F.tmp to <Current directory>\Wkky.exe
from C:\RCX1A.tmp to <Current directory>\FQAM.exe
from C:\RCX19.tmp to <Current directory>\kQYY.exe
from C:\RCX1C.tmp to <Current directory>\jIES.exe
from C:\RCX1B.tmp to <Current directory>\lQYQ.exe
from C:\RCX6.tmp to <Current directory>\WIAy.exe
from C:\RCX5.tmp to <Current directory>\zIcS.exe
from C:\RCX8.tmp to <Current directory>\nocC.exe
from C:\RCX7.tmp to <Current directory>\vAIG.exe
from C:\RCX2.tmp to <Current directory>\VgwY.exe
from C:\RCX1.tmp to <Current directory>\UQQA.exe
from C:\RCX4.tmp to <Current directory>\isYo.exe
from C:\RCX3.tmp to <Current directory>\LEIO.exe
from C:\RCXE.tmp to <Current directory>\tsIq.exe
from C:\RCXD.tmp to <Current directory>\qAkI.exe
from C:\RCX10.tmp to <Current directory>\BssY.exe
from C:\RCXF.tmp to <Current directory>\sIYg.exe
from C:\RCXA.tmp to <Current directory>\joIc.exe
from C:\RCX9.tmp to <Current directory>\esEq.exe
from C:\RCXC.tmp to <Current directory>\BoMa.exe
from C:\RCXB.tmp to <Current directory>\SsYc.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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