Technical Information
To ensure autorun and distribution:
Modifies the following registry keys:
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'grnus' = '%HOMEPATH%\grnus.exe /H'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'Sxikihuvuw' = 'rundll32.exe "%WINDIR%\diapupic.dll",Startup'
- [<HKLM>\SYSTEM\ControlSet001\Control\Print\Providers\2337320384] 'Name' = '"%TEMP%\2.tmp"'
Creates the following files on removable media:
- <Drive name for removable media>:\grnus.exe
- <Drive name for removable media>:\autorun.inf
Malicious functions:
To complicate detection of its presence in the operating system,
forces the system hide from view:
- hidden files
Creates and executes the following:
- %HOMEPATH%\wio.exe
- %HOMEPATH%\grnus.exe
- %HOMEPATH%\vdYf1f3jZu.exe
- %HOMEPATH%\win.exe
Executes the following:
- <SYSTEM32>\rundll32.exe "%WINDIR%\diapupic.dll",iep
- <SYSTEM32>\rundll32.exe "%WINDIR%\diapupic.dll",Startup
Injects code into
the following system processes:
- <SYSTEM32>\spoolsv.exe
Modifies settings of Windows Internet Explorer:
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3] '1208' = '00000000'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3] '1200' = '00000000'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3] '1001' = '00000000'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3] '2000' = '00000000'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3] '1405' = '00000000'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3] '1209' = '00000000'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3] '1400' = '00000000'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3] '1601' = '00000000'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3] 'currentlevel' = '00000000'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3] '{A8A88C49-5EB2-4990-A1A2-0876022C854F}' = ''
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3] '{AEBA21FA-782A-4A90-978D-B72164C80120}' = ''
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3] '1A10' = '00000000'
Modifies file system :
Creates the following files:
- %TEMP%\1.tmp
- %HOMEPATH%\grnus.exe
- %WINDIR%\Temp\3.tmp
- %WINDIR%\diapupic.dll
- %HOMEPATH%\vdYf1f3jZu.exe
- %HOMEPATH%\win.exe
- %HOMEPATH%\wio.exe
Sets the 'hidden' attribute to the following files:
- <Drive name for removable media>:\autorun.inf
- %HOMEPATH%\grnus.exe
Deletes the following files:
- %WINDIR%\Temp\3.tmp
- <DRIVERS>\etc\hosts
- %TEMP%\2.tmp
Deletes itself.
Miscellaneous:
Searches for the following windows:
- ClassName: 'Indicator' WindowName: ''
