Technical Information
To ensure autorun and distribution:
Modifies the following registry keys:
- [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'Update' = '"%TEMP%\csrss.exe" ..'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'Update' = '"%TEMP%\csrss.exe" ..'
Creates or modifies the following files:
- %HOMEPATH%\Start Menu\Programs\Startup\Update.exe
Creates the following files on removable media:
- <Drive name for removable media>:\autorun.inf.lnk
- <Drive name for removable media>:\install.exe.lnk
- <Drive name for removable media>:\install.exe
- <Drive name for removable media>:\Update.exe
- <Drive name for removable media>:\autorun.inf
Malicious functions:
To bypass firewall, removes or modifies the following registry keys:
- [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List] '%TEMP%\csrss.exe' = '%TEMP%\csrss.exe:*:Enabled:csrss.exe'
Creates and executes the following:
- '%TEMP%\csrss.exe'
Executes the following:
- '<SYSTEM32>\netsh.exe' firewall add allowedprogram "%TEMP%\csrss.exe" "csrss.exe" ENABLE
Modifies file system :
Creates the following files:
- <SYSTEM32>\dllcache\myporn.scr
- <SYSTEM32>\dllcache\doc.pif
- <DRIVERS>\svchost.exe
- <SYSTEM32>\dllcache\recycled.exe
- %TEMP%\csrss.exe
- C:\autorun.inf
- C:\install.exe
Sets the 'hidden' attribute to the following files:
- <Drive name for removable media>:\autorun.inf
- <Drive name for removable media>:\install.exe
- C:\install.exe
- <Drive name for removable media>:\Update.exe
- C:\autorun.inf
Network activity:
Connects to:
- 'cs###.serveftp.com':1177
UDP:
- DNS ASK cs###.serveftp.com
Miscellaneous:
Searches for the following windows:
- ClassName: 'Indicator' WindowName: '(null)'
