Trojan.DownLoader8.36919

Technical Information

To ensure autorun and distribution:

Creates the following services:

[<HKLM>\SYSTEM\ControlSet001\Services\LogicalDisk] 'Start' = '00000002'
[<HKLM>\SYSTEM\ControlSet001\Services\Microsoftbill] 'Start' = '00000002'

Malicious functions:

Creates and executes the following:

<SYSTEM32>\wins\NTSVC.exe stop LogicalDisk
<SYSTEM32>\spool\NTSVC.exe create Microsoftbill binpath= "<SYSTEM32>\spool\svchost.exe -service" start= auto Displayname= "Windows Managements Instrumentation Driver"
<SYSTEM32>\spool\svchost.exe -service
<SYSTEM32>\wins\NTSVC.exe create LogicalDisk binpath= "<SYSTEM32>\wins\svchost.exe -service" start= auto Displayname= "Remote Access Auto Connection Managers"
<SYSTEM32>\wins\whw.exe stop LogicalDisk
<SYSTEM32>\spool\whw.exe stop Microsoftbill
<SYSTEM32>\wins\whw.exe stop RasAuto
<SYSTEM32>\spool\NTSVC.exe stop Microsoftbill
<SYSTEM32>\wins\NTSVC.exe delete RasAuto
<SYSTEM32>\wins\NTSVC.exe start LogicalDisk
<SYSTEM32>\spool\whw.exe start Microsoftbill
<SYSTEM32>\wins\whw.exe start LogicalDisk
<SYSTEM32>\wins\svchost.exe -service
<SYSTEM32>\wins\NTSVC.exe description LogicalDisk "No matter what, when a program or a reference to a remote DNS NetBIOS name or address will create a long-range network connections to"
<SYSTEM32>\spool\NTSVC.exe description Microsoftbill "Component Object Model (COM +) components of the configuration and tracking. If you stop the service, most COM +-based components will not work correctly. If you disable the service, any explicit dependence on its service will not start."
<SYSTEM32>\spool\NTSVC.exe config "Microsoftbill" DisplayName= "Windows Managements Instrumentation Driver"
<SYSTEM32>\wins\NTSVC.exe config "LogicalDisk" DisplayName= "Remote Access Auto Connection Managers"
<SYSTEM32>\spool\NTSVC.exe start Microsoftbill
<SYSTEM32>\wins\iexp1orer.exe
<Current directory>\IExp1orer.exe stop vsmon
<Current directory>\IExp1orer.exe delete CCproxy
<Current directory>\IExp1orer.exe stop RunAServces
<Current directory>\IExp1orer.exe delete vsmon
<Current directory>\IExp1orer.exe stop CCproxy
<Current directory>\IExp1orer.exe delete RasAuto
<Current directory>\IExp1orer.exe stop RasAuto
<Current directory>\IExp1orer.exe stop Microsoftbill
<Current directory>\IExp1orer.exe stop LogicalDisk
<Current directory>\IExp1orer.exe start Microsoftbill
<SYSTEM32>\wins\delphi.exe
<SYSTEM32>\spool\spool.exe
<Current directory>\IExp1orer.exe start LogicalDisk
<SYSTEM32>\spool\basic.exe
<Current directory>\IExp1orer.exe stop Bethserv
<Current directory>\IExp1orer.exe stop wmisrvs
<Current directory>\IExp1orer.exe stop svchost
<Current directory>\IExp1orer.exe stop taskmgr

Executes the following:

<SYSTEM32>\attrib.exe +s +h iniuser1.exe
<SYSTEM32>\attrib.exe +s +h CDial.dll
<SYSTEM32>\attrib.exe +s +h +r web
<SYSTEM32>\cmd.exe /c ""<Current directory>\Km.bat" "
<SYSTEM32>\attrib.exe +s +h CCProxy.ini
<SYSTEM32>\attrib.exe +s +h +r Language
<SYSTEM32>\attrib.exe +s +h web
<SYSTEM32>\net1.exe start LogicalDisk
<SYSTEM32>\net1.exe start Microsoftbill
<SYSTEM32>\attrib.exe +s +h Language
<SYSTEM32>\attrib.exe +s +h AccInfo.ini
<SYSTEM32>\cmd.exe /c ""<SYSTEM32>\wins\install.bat" "
<SYSTEM32>\ping.exe 127.0.0.1 -n 1 -w 500
<SYSTEM32>\cmd.exe /c ""<SYSTEM32>\spool\Km.bat" "
<SYSTEM32>\cmd.exe /c <Current directory>\cache.bat
<SYSTEM32>\cmd.exe /c ""<SYSTEM32>\spool\install.bat" "
<SYSTEM32>\cmd.exe /c ""<SYSTEM32>\wins\Km.bat" "
<SYSTEM32>\attrib.exe +s +h svchost.exe
<SYSTEM32>\attrib.exe +s +h uuid.dll
<SYSTEM32>\net1.exe stop LogicalDisk
<SYSTEM32>\net1.exe stop RasAuto
<SYSTEM32>\net1.exe stop Microsoftbill

Modifies file system :

Creates the following files:

<SYSTEM32>\wins\web\log.htm
<SYSTEM32>\wins\web\list.htm
<SYSTEM32>\spool\svchost.exe
<SYSTEM32>\spool\whw.exe
<SYSTEM32>\wins\web\settings.htm
<SYSTEM32>\spool\uuid.dll
<SYSTEM32>\wins\web\index.html
<SYSTEM32>\spool\install.bat
<SYSTEM32>\wins\web\acclist.htm
<SYSTEM32>\spool\CDial.dll
<SYSTEM32>\spool\spool.exe
<SYSTEM32>\wins\web\account.htm
<SYSTEM32>\spool\NTSVC.exe
<SYSTEM32>\wins\AccInfo.ini
<SYSTEM32>\wins\Km.bat
<SYSTEM32>\spool\Km.bat
<SYSTEM32>\wins\iexp1orer.exe
<Current directory>\Km.bat
<SYSTEM32>\dllcache\basic.exe
%HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\KHMHGZ4F\0920[1].asp
<SYSTEM32>\wins\whw.exe
<SYSTEM32>\wins\install.bat
<SYSTEM32>\wins\CDial.dll
<SYSTEM32>\wins\CCProxy.ini
<SYSTEM32>\wins\uuid.dll
<SYSTEM32>\wins\svchost.exe
<SYSTEM32>\wins\NTSVC.exe
<SYSTEM32>\spool\Language\English.ini
<SYSTEM32>\spool\Language\English.chm
<SYSTEM32>\spool\Language\ChineseGB.ini
<SYSTEM32>\spool\web\accheader.htm
<SYSTEM32>\dllcache\delphi.exe
<SYSTEM32>\spool\web\accadd.htm
<SYSTEM32>\spool\Language\ChineseGB.chm
<SYSTEM32>\wins\delphi.exe
<Current directory>\IExp1orer.exe
<Current directory>\cache.bat
<Current directory>\windows.log
<SYSTEM32>\spool\basic.exe
<SYSTEM32>\spool\web\acclist.htm
<SYSTEM32>\spool\AccInfo.ini
<SYSTEM32>\wins\Language\English.ini
<SYSTEM32>\wins\Language\English.chm
<SYSTEM32>\wins\web\accheader.htm
<SYSTEM32>\spool\CCProxy.ini
<SYSTEM32>\wins\web\accadd.htm
<SYSTEM32>\spool\web\settings.htm
<SYSTEM32>\spool\web\list.htm
<SYSTEM32>\spool\web\index.html
<SYSTEM32>\spool\web\account.htm
<SYSTEM32>\wins\Language\ChineseGB.ini
<SYSTEM32>\spool\web\log.htm
<SYSTEM32>\wins\Language\ChineseGB.chm

Sets the 'hidden' attribute to the following files:

<SYSTEM32>\wins\uuid.dll
<SYSTEM32>\spool\CDial.dll
<SYSTEM32>\spool\AccInfo.ini
<SYSTEM32>\wins\CDial.dll
<SYSTEM32>\wins\AccInfo.ini
<SYSTEM32>\spool\uuid.dll
<SYSTEM32>\spool\svchost.exe
<SYSTEM32>\spool\CCProxy.ini
<SYSTEM32>\wins\svchost.exe
<SYSTEM32>\wins\CCProxy.ini

Deletes the following files:

<SYSTEM32>\spool\NTSVC.exe
%TEMP%\~DFC1DD.tmp
<SYSTEM32>\wins\delphi.exe
<SYSTEM32>\wins\whw.exe
<SYSTEM32>\wins\NTSVC.exe
<SYSTEM32>\spool\whw.exe
<SYSTEM32>\spool\spool.exe
%TEMP%\~DF2850.tmp
<Current directory>\cache.bat
%HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\KHMHGZ4F\0920[1].asp
<SYSTEM32>\wins\iexp1orer.exe
%TEMP%\~DF4B3D.tmp

Deletes itself.

Network activity:

Connects to:

'67.##5.160.76':80
'www.sk##67.com':80
'localhost':1036

TCP:

HTTP GET requests:

www.sk##67.com/cs/html/0920.asp?Nu########################################################################################################

UDP:

DNS ASK www.ya##o.com
DNS ASK www.sk##67.com

Miscellaneous:

Searches for the following windows:

ClassName: 'MS_WebcheckMonitor' WindowName: ''
ClassName: 'C--WINDOWS-system32-spool-svchost.HLP' WindowName: ''
ClassName: 'C--WINDOWS-system32-wins-svchost.HLP' WindowName: ''
ClassName: 'EDIT' WindowName: ''
ClassName: 'Shell_TrayWnd' WindowName: ''
ClassName: 'MS_AutodialMonitor' WindowName: ''

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