Technical Information
To ensure autorun and distribution:
Modifies the following registry keys:
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yiafu' = '%HOMEPATH%\yiafu.exe /f'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yiafu' = '%HOMEPATH%\yiafu.exe /I'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yiafu' = '%HOMEPATH%\yiafu.exe /l'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yiafu' = '%HOMEPATH%\yiafu.exe /K'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yiafu' = '%HOMEPATH%\yiafu.exe /U'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yiafu' = '%HOMEPATH%\yiafu.exe /x'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yiafu' = '%HOMEPATH%\yiafu.exe /A'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yiafu' = '%HOMEPATH%\yiafu.exe /z'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yiafu' = '%HOMEPATH%\yiafu.exe /n'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yiafu' = '%HOMEPATH%\yiafu.exe /S'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yiafu' = '%HOMEPATH%\yiafu.exe /M'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yiafu' = '%HOMEPATH%\yiafu.exe /R'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yiafu' = '%HOMEPATH%\yiafu.exe /t'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yiafu' = '%HOMEPATH%\yiafu.exe /D'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yiafu' = '%HOMEPATH%\yiafu.exe /p'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yiafu' = '%HOMEPATH%\yiafu.exe /q'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yiafu' = '%HOMEPATH%\yiafu.exe /e'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yiafu' = '%HOMEPATH%\yiafu.exe /G'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yiafu' = '%HOMEPATH%\yiafu.exe /H'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yiafu' = '%HOMEPATH%\yiafu.exe /B'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yiafu' = '%HOMEPATH%\yiafu.exe /j'
Creates the following files on removable media:
- <Drive name for removable media>:\Documents.lnk
- <Drive name for removable media>:\Passwords.lnk
- <Drive name for removable media>:\Pictures.lnk
- <Drive name for removable media>:\Video.lnk
- <Drive name for removable media>:\Music.lnk
- <Drive name for removable media>:\buY.ico
- <Drive name for removable media>:\autorun.inf
- <Drive name for removable media>:\yiafu.exe
- <Drive name for removable media>:\New Folder.lnk
- <Drive name for removable media>:\yiafux.exe
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%\yiafu.exe
Modifies file system :
Creates the following files:
- %HOMEPATH%\yiafu.exe
Sets the 'hidden' attribute to the following files:
- <Drive name for removable media>:\yiafu.exe
- <Drive name for removable media>:\yiafux.exe
- <Drive name for removable media>:\buY.ico
- %HOMEPATH%\yiafu.exe
- <Drive name for removable media>:\autorun.inf
Network activity:
Connects to:
- 'ns#.##ayer1253.com':8000
UDP:
- DNS ASK ns#.##ayer1253.com
- '<Private IP address>':1034
Miscellaneous:
Searches for the following windows:
- ClassName: 'Indicator' WindowName: ''
