Technical Information
To ensure autorun and distribution:
Modifies the following registry keys:
- [\REGISTRY\USER\S-1-5-19\Software\Microsoft\Windows\CurrentVersion\Run] 'PuYo.exe' = '%TEMP%\PuYo.exe'
- [\REGISTRY\USER\S-1-5-20\Software\Microsoft\Windows\CurrentVersion\Run] 'PuYo.exe' = '%TEMP%\PuYo.exe'
- [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'PuYo.exe' = '%TEMP%\PuYo.exe'
- [<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Shell' = 'Explorer.exe %TEMP%\PuYo.exe'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'PuYo.exe' = '%TEMP%\PuYo.exe'
Creates the following files on removable media:
- <Drive name for removable media>:\autorun.inf
- <Drive name for removable media>:\PuYo.exe
Malicious functions:
To complicate detection of its presence in the operating system,
blocks execution of the following system utilities:
- Windows Task Manager (Taskmgr)
- Registry Editor (RegEdit)
Creates and executes the following:
- '%TEMP%\PuYo.exe'
Modifies settings of Windows Explorer:
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer] 'NofolderOptions' = '00000001'
Attempts to shut down the Windows operating system.
Modifies file system :
Creates the following files:
- %TEMP%\auto.vbs
- %TEMP%\aut1.tmp
- %TEMP%\PuYo.exe
Sets the 'hidden' attribute to the following files:
- <Drive name for removable media>:\autorun.inf
- <Drive name for removable media>:\PuYo.exe
- %TEMP%\PuYo.exe
Deletes the following files:
- <Drive name for removable media>:\autorun.inf
- %TEMP%\aut1.tmp
Network activity:
Connects to:
- '<Private IP address>':80
- '<Private IP address>':445
Miscellaneous:
Searches for the following windows:
- ClassName: 'Indicator' WindowName: ''
