Technical Information
To ensure autorun and distribution:
Modifies the following registry keys:
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yauat' = '%HOMEPATH%\yauat.exe /v'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yauat' = '%HOMEPATH%\yauat.exe /w'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yauat' = '%HOMEPATH%\yauat.exe /O'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yauat' = '%HOMEPATH%\yauat.exe /g'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yauat' = '%HOMEPATH%\yauat.exe /f'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yauat' = '%HOMEPATH%\yauat.exe /S'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yauat' = '%HOMEPATH%\yauat.exe /n'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yauat' = '%HOMEPATH%\yauat.exe /i'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yauat' = '%HOMEPATH%\yauat.exe /U'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yauat' = '%HOMEPATH%\yauat.exe /T'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yauat' = '%HOMEPATH%\yauat.exe /J'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yauat' = '%HOMEPATH%\yauat.exe /d'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yauat' = '%HOMEPATH%\yauat.exe /Z'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yauat' = '%HOMEPATH%\yauat.exe /A'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yauat' = '%HOMEPATH%\yauat.exe /C'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yauat' = '%HOMEPATH%\yauat.exe /M'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yauat' = '%HOMEPATH%\yauat.exe /b'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yauat' = '%HOMEPATH%\yauat.exe /p'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yauat' = '%HOMEPATH%\yauat.exe /h'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yauat' = '%HOMEPATH%\yauat.exe /e'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yauat' = '%HOMEPATH%\yauat.exe /Q'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yauat' = '%HOMEPATH%\yauat.exe /Y'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yauat' = '%HOMEPATH%\yauat.exe /X'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yauat' = '%HOMEPATH%\yauat.exe /l'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yauat' = '%HOMEPATH%\yauat.exe /k'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yauat' = '%HOMEPATH%\yauat.exe /R'
Creates the following files on removable media:
- <Drive name for removable media>:\autorun.inf
- <Drive name for removable media>:\KOCa.ico
- <Drive name for removable media>:\yauat.exe
- <Drive name for removable media>:\yauatx.exe
- <Drive name for removable media>:\New Folder.lnk
- <Drive name for removable media>:\Passwords.lnk
- <Drive name for removable media>:\Documents.lnk
- <Drive name for removable media>:\Pictures.lnk
- <Drive name for removable media>:\Music.lnk
- <Drive name for removable media>:\Video.lnk
Malicious functions:
To complicate detection of its presence in the operating system,
forces the system hide from view:
- hidden files
Modifies file system:
Creates the following files:
- %HOMEPATH%\yauat.exe
Sets the 'hidden' attribute to the following files:
- %HOMEPATH%\yauat.exe
- <Drive name for removable media>:\autorun.inf
- <Drive name for removable media>:\KOCa.ico
- <Drive name for removable media>:\yauat.exe
- <Drive name for removable media>:\yauatx.exe
Network activity:
Connects to:
- 'ns#.##ayer1532.com':8000
UDP:
- DNS ASK ns#.##ayer1532.com
Miscellaneous:
Creates and executes the following:
- '%HOMEPATH%\yauat.exe'