Technical Information
To ensure autorun and distribution:
Modifies the following registry keys:
- [<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Shell' = 'explorer.exe "%WINDIR%\csrss.exe"'
Creates the following services:
- [<HKLM>\SYSTEM\ControlSet001\Services\ZWmiApRplL] 'ImagePath' = '<SYSTEM32>\drive21.sys'
- [<HKLM>\SYSTEM\ControlSet001\Services\ZWmiApRplL] 'Start' = '00000001'
Creates the following files on removable media:
- <Drive name for removable media>:\autorun.inf
- <Drive name for removable media>:\NTruntr.exe
Malicious functions:
To complicate detection of its presence in the operating system,
forces the system hide from view:
- hidden files
blocks execution of the following system utilities:
- Windows Task Manager (Taskmgr)
- Registry Editor (RegEdit)
Executes the following:
- '%WINDIR%\csrss.exe'
Modifies file system:
Creates the following files:
- %HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\KHMHGZ4F\conta[1].php
- %WINDIR%\csrss.exe
- <SYSTEM32>\drive21.sys
Sets the 'hidden' attribute to the following files:
- <Drive name for removable media>:\NTruntr.exe
- %WINDIR%\csrss.exe
- <SYSTEM32>\drive21.sys
Network activity:
Connects to:
- 'pl####a.freetzi.com':80
- 'localhost':1038
TCP:
HTTP GET requests:
- http://pl####a.freetzi.com/conta/conta.php
UDP:
- DNS ASK pl####a.freetzi.com
Miscellaneous:
Searches for the following windows:
- ClassName: 'MS_WebcheckMonitor' WindowName: ''
- ClassName: 'Shell_TrayWnd' WindowName: ''
- ClassName: 'MS_WINHELP' WindowName: ''
- ClassName: 'MS_AutodialMonitor' WindowName: ''
