Technical Information
To ensure autorun and distribution:
Modifies the following registry keys:
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'cuoul' = '%HOMEPATH%\cuoul.exe /K'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'cuoul' = '%HOMEPATH%\cuoul.exe /x'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'cuoul' = '%HOMEPATH%\cuoul.exe /B'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'cuoul' = '%HOMEPATH%\cuoul.exe /y'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'cuoul' = '%HOMEPATH%\cuoul.exe /Z'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'cuoul' = '%HOMEPATH%\cuoul.exe /U'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'cuoul' = '%HOMEPATH%\cuoul.exe /m'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'cuoul' = '%HOMEPATH%\cuoul.exe /L'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'cuoul' = '%HOMEPATH%\cuoul.exe /t'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'cuoul' = '%HOMEPATH%\cuoul.exe /a'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'cuoul' = '%HOMEPATH%\cuoul.exe /g'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'cuoul' = '%HOMEPATH%\cuoul.exe /h'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'cuoul' = '%HOMEPATH%\cuoul.exe /F'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'cuoul' = '%HOMEPATH%\cuoul.exe /p'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'cuoul' = '%HOMEPATH%\cuoul.exe /r'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'cuoul' = '%HOMEPATH%\cuoul.exe /S'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'cuoul' = '%HOMEPATH%\cuoul.exe /i'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'cuoul' = '%HOMEPATH%\cuoul.exe /C'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'cuoul' = '%HOMEPATH%\cuoul.exe /D'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'cuoul' = '%HOMEPATH%\cuoul.exe /v'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'cuoul' = '%HOMEPATH%\cuoul.exe /e'
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>:\UvuB.ico
- <Drive name for removable media>:\autorun.inf
- <Drive name for removable media>:\cuoul.exe
- <Drive name for removable media>:\New Folder.lnk
- <Drive name for removable media>:\cuoulx.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%\cuoul.exe
Modifies file system :
Creates the following files:
- %HOMEPATH%\cuoul.exe
Sets the 'hidden' attribute to the following files:
- <Drive name for removable media>:\cuoul.exe
- <Drive name for removable media>:\cuoulx.exe
- <Drive name for removable media>:\UvuB.ico
- %HOMEPATH%\cuoul.exe
- <Drive name for removable media>:\autorun.inf
Network activity:
Connects to:
- 'ns#.##ayer1532.com':8000
UDP:
- DNS ASK ns#.##ayer1532.com
Miscellaneous:
Searches for the following windows:
- ClassName: 'Indicator' WindowName: ''
