Technical Information
To ensure autorun and distribution:
Modifies the following registry keys:
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] '{BRO-Lg-U65Z7ZRC}' = '%TEMP%\\Systeme\WindowsUpdate.exe'
Creates the following files on removable media:
- <Drive name for removable media>:\autorun.inf
- <Drive name for removable media>:\WindowsUpdate.exe
Malicious functions:
To bypass firewall, removes or modifies the following registry keys:
- [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile] 'DoNotAllowExceptions' = '00000000'
- [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile] 'EnableFirewall' = '00000000'
To complicate detection of its presence in the operating system,
blocks execution of the following system utilities:
- Windows Task Manager (Taskmgr)
Executes the following:
- '<SYSTEM32>\wscript.exe' "<SYSTEM32>\s4c.vbs"
- '<SYSTEM32>\netsh.exe' firewall set opmode disable
Modifies file system :
Creates the following files:
- <SYSTEM32>\s4c.vbs
- %TEMP%\dw.log
- %TEMP%\27D35.dmp
- %WINDIR%Update.exe
- C:\autorun.inf
- %TEMP%\Systeme\WindowsUpdate.exe
Sets the 'hidden' attribute to the following files:
- <Drive name for removable media>:\autorun.inf
- <Drive name for removable media>:\WindowsUpdate.exe
- C:\autorun.inf
- %WINDIR%Update.exe
Deletes the following files:
- <SYSTEM32>\s4c.vbs
Modifies the HOSTS file.
Miscellaneous:
Searches for the following windows:
- ClassName: 'Shell_TrayWnd' WindowName: '(null)'
- ClassName: 'Indicator' WindowName: '(null)'
