Technical Information
To ensure autorun and distribution:
Modifies the following registry keys:
- [<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'YiHui' = 'c:\svchost.exe'
Creates the following files on removable media:
- <Drive name for removable media>:\autorun.inf
- <Drive name for removable media>:\svchost.exe
Malicious functions:
Creates and executes the following:
- 'C:\svchost.exe'
- 'C:\svchost.exe' (downloaded from the Internet)
Executes the following:
- '<SYSTEM32>\attrib.exe' +r +s +h f:\yihui.exe
- '<SYSTEM32>\attrib.exe' +r +s +h e:\yihui.exe
- '<SYSTEM32>\attrib.exe' +r +s +h <Drive name for removable media>:\yihui.exe
- '<SYSTEM32>\reg.exe' ADD HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run /v YiHui /t REG_SZ /d c:\svchost.exe /f
- '<SYSTEM32>\attrib.exe' +r +s +h h:\yihui.exe
- '<SYSTEM32>\attrib.exe' +r +s +h g:\yihui.exe
- '<SYSTEM32>\attrib.exe' +r +s +h c:\yihui.exe
- '<SYSTEM32>\attrib.exe' +r +s +h e:\AUTORUN.INf
- '<SYSTEM32>\attrib.exe' +r +s +h <Drive name for removable media>:\AUTORUN.INf
- '<SYSTEM32>\cmd.exe' /c <Current directory>\YiHui.bat
- '<SYSTEM32>\attrib.exe' +r +s +h h:\AUTORUN.INf
- '<SYSTEM32>\attrib.exe' +r +s +h g:\AUTORUN.INf
- '<SYSTEM32>\attrib.exe' +r +s +h f:\AUTORUN.INf
Modifies file system :
Creates the following files:
- <Current directory>\YiHui.inf
- <Current directory>\YiHui.bat
- C:\svchost.exe
- %HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\KHMHGZ4F\svchost[1].exe
Sets the 'hidden' attribute to the following files:
- <Drive name for removable media>:\autorun.inf
Deletes the following files:
- <Current directory>\YiHui.inf
- %TEMP%\~DFFCB8.tmp
Deletes itself.
Network activity:
Connects to:
- 'di####.123456pay.com':80
- 'localhost':1036
TCP:
HTTP GET requests:
- di####.123456pay.com/svchost.exe
UDP:
- DNS ASK di####.123456pay.com