Technical Information
To ensure autorun and distribution:
Modifies the following registry keys:
- [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'ef6805c25b5a2f877bc96e021971597e' = '"%TEMP%\lsass.exe" ..'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'ef6805c25b5a2f877bc96e021971597e' = '"%TEMP%\lsass.exe" ..'
Creates or modifies the following files:
- %HOMEPATH%\Start Menu\Programs\Startup\ef6805c25b5a2f877bc96e021971597e.exe
Malicious functions:
To bypass firewall, removes or modifies the following registry keys:
- [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '%TEMP%\lsass.exe' = '%TEMP%\lsass.exe:*:Enabled:lsass.exe'
Creates and executes the following:
- '%TEMP%\Security.exe'
- '%TEMP%\lsass.exe'
- '%HOMEPATH%\Local Settings\TempWindows.exe'
- '%TEMP%\Security.exe' (downloaded from the Internet)
Executes the following:
- '<SYSTEM32>\netsh.exe' firewall add allowedprogram "%TEMP%\lsass.exe" "lsass.exe" ENABLE
Modifies file system :
Creates the following files:
- %TEMP%\Security.exe
- %TEMP%\lsass.exe
- %HOMEPATH%\Local Settings\TempWindows.exe
Network activity:
Connects to:
- 'fi###melt.com':80
- 'sk###.myftp.biz':1177
- 'wp#d':80
TCP:
HTTP GET requests:
- fi###melt.com/downloader/Windows_Update.exe
- wp#d/wpad.dat
UDP:
- DNS ASK fi###melt.com
- DNS ASK sk###.myftp.biz
- DNS ASK wp#d
Miscellaneous:
Searches for the following windows:
- ClassName: 'Indicator' WindowName: '(null)'
