Technical Information
To ensure autorun and distribution
Modifies the following registry keys
- [<HKCU>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'svchos' = '<SYSTEM32>\Dwm.exe'
- [<HKCU>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'svchos' = '<Full path to file>'
Changes the following executable system files
- <SYSTEM32>\dwm.exe
Malicious functions
Executes the following
- '<SYSTEM32>\net.exe' stop "audioendpointbuilder" /y
- '<SYSTEM32>\net.exe' stop "samss" /y
Injects code into
the following system processes:
- <SYSTEM32>\taskhost.exe
Modifies file system
Creates the following files
- <Current directory>\vfrtywx.exe
- %ALLUSERSPROFILE%\application data\adobe\setup\{ac76ba86-7ad7-1033-7b44-ac0f074e4100}\data1.cab
- %ALLUSERSPROFILE%\adobe\arm\reader_15.007.20033\acrordrdcupd1500920077.msp
- %ALLUSERSPROFILE%\application data\application data\adobe\arm\reader_15.007.20033\readerdcmanifest.msi
- %ALLUSERSPROFILE%\application data\adobe\setup\{ac76ba86-7ad7-1033-7b44-ac0f074e4100}\acroread.msi
- %ALLUSERSPROFILE%\application data\application data\application data\application data\application data\application data\application data\application data\application data\application data\appli...
- %ALLUSERSPROFILE%\adobe\setup\{ac76ba86-7ad7-1033-7b44-ac0f074e4100}\acrordrdcupd1500820082.msp
- %ALLUSERSPROFILE%\adobe\setup\{ac76ba86-7ad7-1033-7b44-ac0f074e4100}\ryukreadme.html
- %ALLUSERSPROFILE%\adobe\setup\ryukreadme.html
- %ALLUSERSPROFILE%\adobe\arm\{291aa914-a987-4ce9-bd63-ac0a92d435e5}\ryukreadme.html
- %ALLUSERSPROFILE%\adobe\arm\s\10428\ryukreadme.html
- %ALLUSERSPROFILE%\adobe\arm\s\ryukreadme.html
- %ALLUSERSPROFILE%\adobe\arm\reader_15.008.20082\ryukreadme.html
- %ALLUSERSPROFILE%\adobe\arm\reader_15.007.20033\ryukreadme.html
- %ALLUSERSPROFILE%\adobe\arm\ryukreadme.html
- %ALLUSERSPROFILE%\adobe\ryukreadme.html
- %ALLUSERSPROFILE%\ryukreadme.html
- C:\documents and settings\ryukreadme.html
- C:\ryukreadme.html
- D:\$recycle.bin\s-1-5-21-1960123792-2022915161-3775307078-1001\ryukreadme.html
- D:\$recycle.bin\ryukreadme.html
- D:\ryukreadme.html
- %TEMP%\ryukreadme.html
- %PROGRAMDATA%\microsoft\crypto\rsa\machinekeys\08e575673cce10c72090304839888e02_36d1130a-ac2e-44f7-9dc1-e424fbcbe0ee
- %ALLUSERSPROFILE%\application data\application data\application data\application data\application data\application data\application data\application data\application data\application data\docum...
- %ALLUSERSPROFILE%\application data\application data\application data\application data\application data\application data\application data\application data\application data\application data\micro...
Moves the following files
- from %ALLUSERSPROFILE%\adobe\setup\{ac76ba86-7ad7-1033-7b44-ac0f074e4100}\acrordrdcupd1500820082.msp to %ALLUSERSPROFILE%\adobe\setup\{ac76ba86-7ad7-1033-7b44-ac0f074e4100}\acrordrdcupd1500820082.msp.ryk
- from %ALLUSERSPROFILE%\application data\application data\application data\application data\application data\application data\application data\application data\application data\application data\appli... to %ALLUSERSPROFILE%\application data\application data\application data\application data\application data\application data\application data\application data\application data\application data\appli...
- from %ALLUSERSPROFILE%\application data\adobe\setup\{ac76ba86-7ad7-1033-7b44-ac0f074e4100}\acroread.msi to %ALLUSERSPROFILE%\application data\adobe\setup\{ac76ba86-7ad7-1033-7b44-ac0f074e4100}\acroread.msi.ryk
- from %ALLUSERSPROFILE%\application data\application data\application data\application data\application data\application data\application data\application data\application data\application data\docum... to %ALLUSERSPROFILE%\application data\application data\application data\application data\application data\application data\application data\application data\application data\application data\docum...
- from %ALLUSERSPROFILE%\application data\application data\application data\application data\application data\application data\application data\application data\application data\application data\micro... to %ALLUSERSPROFILE%\application data\application data\application data\application data\application data\application data\application data\application data\application data\application data\micro...
Network activity
UDP
- '<LOCALNET>.42.1':7
- '22#.0.0.22':7
- '22#.0.0.252':7
- '23#.#55.255.250':7
Miscellaneous
Creates and executes the following
- '<Current directory>\vfrtywx.exe' 8 LAN
- '<Current directory>\vfrtywx.exe' 8 LAN' (with hidden window)
- '<SYSTEM32>\net.exe' stop "audioendpointbuilder" /y' (with hidden window)
- '<SYSTEM32>\net.exe' stop "samss" /y' (with hidden window)
- '<SYSTEM32>\cmd.exe' /C REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "<SYSTEM32>\Dwm.exe" /f' (with hidden window)
- '<SYSTEM32>\cmd.exe' /C REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "<Full path to file>" /f' (with hidden window)
Executes the following
- '<SYSTEM32>\net1.exe' stop "audioendpointbuilder" /y
- '<SYSTEM32>\net1.exe' stop "samss" /y
- '<SYSTEM32>\cmd.exe' /C REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "<SYSTEM32>\Dwm.exe" /f
- '<SYSTEM32>\cmd.exe' /C REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "<Full path to file>" /f
- '<SYSTEM32>\reg.exe' ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "<SYSTEM32>\Dwm.exe" /f
- '<SYSTEM32>\reg.exe' ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "<Full path to file>" /f
