Technical Information
To ensure autorun and distribution:
Modifies the following registry keys:
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yrmaf' = '%HOMEPATH%\yrmaf.exe /Z'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yrmaf' = '%HOMEPATH%\yrmaf.exe /B'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yrmaf' = '%HOMEPATH%\yrmaf.exe /d'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yrmaf' = '%HOMEPATH%\yrmaf.exe /I'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yrmaf' = '%HOMEPATH%\yrmaf.exe /l'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yrmaf' = '%HOMEPATH%\yrmaf.exe /o'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yrmaf' = '%HOMEPATH%\yrmaf.exe /J'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yrmaf' = '%HOMEPATH%\yrmaf.exe /W'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yrmaf' = '%HOMEPATH%\yrmaf.exe /S'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yrmaf' = '%HOMEPATH%\yrmaf.exe /v'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yrmaf' = '%HOMEPATH%\yrmaf.exe /F'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yrmaf' = '%HOMEPATH%\yrmaf.exe /Q'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yrmaf' = '%HOMEPATH%\yrmaf.exe /a'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yrmaf' = '%HOMEPATH%\yrmaf.exe /c'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yrmaf' = '%HOMEPATH%\yrmaf.exe /T'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yrmaf' = '%HOMEPATH%\yrmaf.exe /y'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yrmaf' = '%HOMEPATH%\yrmaf.exe /h'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yrmaf' = '%HOMEPATH%\yrmaf.exe /x'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yrmaf' = '%HOMEPATH%\yrmaf.exe /R'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yrmaf' = '%HOMEPATH%\yrmaf.exe /u'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yrmaf' = '%HOMEPATH%\yrmaf.exe /p'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yrmaf' = '%HOMEPATH%\yrmaf.exe /e'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yrmaf' = '%HOMEPATH%\yrmaf.exe /K'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yrmaf' = '%HOMEPATH%\yrmaf.exe /N'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yrmaf' = '%HOMEPATH%\yrmaf.exe /G'
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'yrmaf' = '%HOMEPATH%\yrmaf.exe /m'
Creates the following files on removable media:
- <Drive name for removable media>:\autorun.inf
- <Drive name for removable media>:\JxQO.ico
- <Drive name for removable media>:\yrmaf.exe
- <Drive name for removable media>:\yrmafx.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%\yrmaf.exe
Sets the 'hidden' attribute to the following files:
- %HOMEPATH%\yrmaf.exe
- <Drive name for removable media>:\autorun.inf
- <Drive name for removable media>:\JxQO.ico
- <Drive name for removable media>:\yrmaf.exe
- <Drive name for removable media>:\yrmafx.exe
Network activity:
Connects to:
- 'ns#.##ayer1532.com':8000
UDP:
- DNS ASK ns#.##ayer1532.com
Miscellaneous:
Creates and executes the following:
- '%HOMEPATH%\yrmaf.exe'