Trojan.DownLoader8.36965

Technical Information

To ensure autorun and distribution:

Creates the following services:

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

Malicious functions:

Creates and executes the following:

<SYSTEM32>\spool\NTSVC.exe config "Microsoftbill" DisplayName= "Windows Managements Instrumentation Drivers"
<SYSTEM32>\wins\NAI.exe stop Cryptvc
<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>\wins\NTSVC.exe stop Cryptvc
<SYSTEM32>\spool\NTSVC.exe create Microsoftbill binpath= "<SYSTEM32>\spool\svchost.exe -service" start= auto Displayname= "Windows Managements Instrumentation Drivers"
<SYSTEM32>\spool\NTSVC.exe stop Microsoftbill
<SYSTEM32>\wins\NTSVC.exe delete LogicalDisk
<SYSTEM32>\wins\NTSVC.exe stop LogicalDisk
<SYSTEM32>\wins\NTSVC.exe create Cryptvc binpath= "<SYSTEM32>\wins\svchost.exe -service" start= auto Displayname= "Remote Access Auto Connection Managers"
<SYSTEM32>\wins\NAI.exe start Cryptvc
<SYSTEM32>\wins\NTSVC.exe description Cryptvc "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>\wins\NTSVC.exe start Cryptvc
<SYSTEM32>\wins\svchost.exe -service
<SYSTEM32>\spool\svchost.exe -service
<SYSTEM32>\spool\NTSVC.exe start Microsoftbill
<SYSTEM32>\spool\KZ.exe start Microsoftbill
<SYSTEM32>\wins\NTSVC.exe config "Cryptvc" DisplayName= "Remote Access Auto Connection Managers"
<SYSTEM32>\wins\NAI.exe stop LogicalDisk
<Current directory>\a1g.exe delete RasAuto
<Current directory>\a1g.exe stop RasAuto
<SYSTEM32>\spool\basic.exe
<SYSTEM32>\wins\delphi.exe
<Current directory>\a1g.exe delete LogicalDisk
<Current directory>\a1g.exe stop LogicalDisk
<Current directory>\a1g.exe stop Microsoftbill
<Current directory>\a1g.exe stop Cryptvc
<Current directory>\a1g.exe config Microsoftbill start= auto
<SYSTEM32>\spool\KZ.exe stop Microsoftbill
<SYSTEM32>\wins\NAI.exe stop RasAuto
<SYSTEM32>\wins\NTSVC.exe delete RasAuto
<SYSTEM32>\wins\NTSVC.exe stop RasAuto
<Current directory>\a1g.exe config Cryptvc start= auto
<Current directory>\a1g.exe start Microsoftbill
<Current directory>\a1g.exe start LogicalDisk
<Current directory>\a1g.exe start Cryptvc

Executes the following:

<SYSTEM32>\attrib.exe +s +h <SYSTEM32>\wins\CCProxy.ini
<SYSTEM32>\attrib.exe +s +h <SYSTEM32>\wins\svchost.exe
<SYSTEM32>\attrib.exe +s +h <SYSTEM32>\spool\AccInfo.ini
<SYSTEM32>\net1.exe stop Cryptvc
<SYSTEM32>\attrib.exe +s +h +r <SYSTEM32>\spool\Language
<SYSTEM32>\attrib.exe +s +h <SYSTEM32>\spool\CDial.dll
<SYSTEM32>\net1.exe start Cryptvc
<SYSTEM32>\attrib.exe +s +h <SYSTEM32>\wins\AccInfo.ini
<SYSTEM32>\attrib.exe +s +h <SYSTEM32>\wins\CDial.dll
<SYSTEM32>\attrib.exe +s +h <SYSTEM32>\wins\uuid.dll
<SYSTEM32>\attrib.exe +s +h <SYSTEM32>\wins\web
<SYSTEM32>\net1.exe start LogicalDisk
<SYSTEM32>\attrib.exe +s +h <SYSTEM32>\spool\CCProxy.ini
<SYSTEM32>\net1.exe start Microsoftbill
<SYSTEM32>\cmd.exe /c <SYSTEM32>\wins\WS.bat
<SYSTEM32>\cmd.exe /c <SYSTEM32>\spool\SL.bat
<SYSTEM32>\net1.exe stop RasAuto
<SYSTEM32>\attrib.exe +s +h <SYSTEM32>\spool\svchost.exe
<SYSTEM32>\attrib.exe +s +h <SYSTEM32>\spool\web
<SYSTEM32>\net1.exe stop LogicalDisk
<SYSTEM32>\attrib.exe +s +h <SYSTEM32>\spool\uuid.dll
<SYSTEM32>\net1.exe stop Microsoftbill

Modifies file system :

Creates the following files:

<SYSTEM32>\spool\web\log.htm
<SYSTEM32>\wins\uuid.dll
<SYSTEM32>\wins\WS.bat
<SYSTEM32>\spool\web\settings.htm
<SYSTEM32>\spool\web\list.htm
<SYSTEM32>\spool\web\acclist.htm
<SYSTEM32>\wins\svchost.exe
<SYSTEM32>\spool\web\index.html
<SYSTEM32>\spool\web\account.htm
<SYSTEM32>\spool\AccInfo.ini
<SYSTEM32>\spool\uuid.dll
<SYSTEM32>\spool\svchost.exe
<SYSTEM32>\dllcache\basic.exe
<Current directory>\Km.bat
<SYSTEM32>\spool\SL.bat
<SYSTEM32>\spool\CDial.dll
<SYSTEM32>\spool\CCProxy.ini
<SYSTEM32>\spool\NTSVC.exe
<SYSTEM32>\spool\KZ.exe
<SYSTEM32>\spool\web\accheader.htm
<SYSTEM32>\wins\web\accheader.htm
<SYSTEM32>\wins\web\accadd.htm
<SYSTEM32>\wins\web\account.htm
<SYSTEM32>\wins\web\acclist.htm
<SYSTEM32>\dllcache\delphi.exe
<SYSTEM32>\wins\delphi.exe
<Current directory>\a1g.exe
<SYSTEM32>\spool\basic.exe
<SYSTEM32>\wins\web\index.html
<SYSTEM32>\wins\NAI.exe
<SYSTEM32>\wins\CDial.dll
<SYSTEM32>\spool\web\accadd.htm
<SYSTEM32>\wins\NTSVC.exe
<SYSTEM32>\wins\CCProxy.ini
<SYSTEM32>\wins\web\log.htm
<SYSTEM32>\wins\web\list.htm
<SYSTEM32>\wins\AccInfo.ini
<SYSTEM32>\wins\web\settings.htm

Sets the 'hidden' attribute to the following files:

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

Deletes the following files:

<SYSTEM32>\spool\NTSVC.exe
<SYSTEM32>\wins\NAI.exe
<SYSTEM32>\wins\NTSVC.exe
<SYSTEM32>\wins\delphi.exe
<SYSTEM32>\spool\basic.exe
<SYSTEM32>\spool\KZ.exe

Network activity:

Connects to:

'67.##5.160.76':80
'21#.#5.5.121':82
'localhost':1035

UDP:

DNS ASK www.ya##o.com

Miscellaneous:

Searches for the following windows:

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

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