Technical Information
To ensure autorun and distribution
Creates or modifies the following files
- <SYSTEM32>\tasks\masonpowershell.exe
Malicious functions
To complicate detection of its presence in the operating system,
adds antivirus exclusion:
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath '%APPDATA%\Powershell.exe'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Powershell.exe'
Injects code into
the following system processes:
- <SYSTEM32>\winlogon.exe
- <SYSTEM32>\services.exe
- <SYSTEM32>\lsass.exe
- <SYSTEM32>\lsm.exe
- <SYSTEM32>\svchost.exe
- <SYSTEM32>\spoolsv.exe
- <SYSTEM32>\taskhost.exe
- <SYSTEM32>\dwm.exe
- %WINDIR%\explorer.exe
- <SYSTEM32>\wudfhost.exe
- <SYSTEM32>\sppsvc.exe
- <SYSTEM32>\schtasks.exe
- <SYSTEM32>\conhost.exe
- <SYSTEM32>\windowspowershell\v1.0\powershell.exe
- <SYSTEM32>\werfault.exe
the following user processes:
- firefox.exe
Hooks functions
in browsers
- firefox.exe process, advapi32.dll module
Terminates or attempts to terminate
the following system processes:
- <SYSTEM32>\schtasks.exe
Searches for windows to
detect analytical utilities:
- ClassName: 'OLLYDBG', WindowName: ''
- ClassName: 'GBDYLLO', WindowName: ''
- ClassName: 'pediy06', WindowName: ''
- ClassName: 'FilemonClass', WindowName: ''
- ClassName: '', WindowName: 'File Monitor - Sysinternals: www.sysinternals.com'
- ClassName: 'PROCMON_WINDOW_CLASS', WindowName: ''
- ClassName: '', WindowName: 'Process Monitor - Sysinternals: www.sysinternals.com'
- ClassName: 'RegmonClass', WindowName: ''
Modifies file system
Creates the following files
- %APPDATA%\powershell.exe
- %APPDATA%\autoruns64.exe
- %TEMP%\jy4lkgif.vq1.exe
Miscellaneous
Searches for the following windows
- ClassName: 'Registry Monitor - Sysinternals: www.sysinternals.com' WindowName: ''
- ClassName: '18467-41' WindowName: ''
Creates and executes the following
- '%APPDATA%\powershell.exe'
- '%APPDATA%\autoruns64.exe'
- '%TEMP%\jy4lkgif.vq1.exe'
Executes the following
- '<SYSTEM32>\schtasks.exe' /create /tn "MasonPowershell.exe" /tr "'%APPDATA%\Powershell.exe'" /sc onlogon /rl HIGHEST
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath '%APPDATA%\Powershell.exe'' (with hidden window)
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Powershell.exe'' (with hidden window)
