Technical Information
To ensure autorun and distribution
Modifies the following registry keys
- [HKCU\Software\Microsoft\Windows\CurrentVersion\Run] 'firefox' = '"%LOCALAPPDATA%\Microsoft Help\firefox.exe"'
- [HKLM\Software\Microsoft\Windows\CurrentVersion\Run] 'firefox' = '"%LOCALAPPDATA%\Microsoft Help\firefox.exe"'
- [HKLM\Software\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Shell' = 'explorer.exe, "%LOCALAPPDATA%\Microsoft Help\firefox.exe"'
- [HKCU\Software\Microsoft\Windows\CurrentVersion\Run] 'firefox' = '"C:\kms\firefox.exe"'
- [HKLM\Software\Microsoft\Windows\CurrentVersion\Run] 'firefox' = '"C:\kms\firefox.exe"'
- [HKLM\Software\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Shell' = 'explorer.exe, "%LOCALAPPDATA%\Microsoft Help\firefox.exe", "C:\kms\firefox.exe"'
- [HKCU\Software\Microsoft\Windows\CurrentVersion\Run] 'WUDFHost' = '"%ProgramFiles%\Windows Media Player\WUDFHost.exe"'
- [HKLM\Software\Microsoft\Windows\CurrentVersion\Run] 'WUDFHost' = '"%ProgramFiles%\Windows Media Player\WUDFHost.exe"'
- [HKLM\Software\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Shell' = 'explorer.exe, "%LOCALAPPDATA%\Microsoft Help\firefox.exe", "C:\kms\firefox.exe", "%ProgramFiles%\Windows Media Player\WUD...
- [HKCU\Software\Microsoft\Windows\CurrentVersion\Run] 'sppsvc' = '"C:\kms\sppsvc.exe"'
- [HKLM\Software\Microsoft\Windows\CurrentVersion\Run] 'sppsvc' = '"C:\kms\sppsvc.exe"'
- [HKCU\Software\Microsoft\Windows\CurrentVersion\Run] 'smss' = '"%ProgramFiles%\Reference Assemblies\Microsoft\Framework\v3.5\RedistList\smss.exe"'
- [HKLM\Software\Microsoft\Windows\CurrentVersion\Run] 'smss' = '"%ProgramFiles%\Reference Assemblies\Microsoft\Framework\v3.5\RedistList\smss.exe"'
- [HKCU\Software\Microsoft\Windows\CurrentVersion\Run] '<File name>' = '"<Full path to file>"'
- [HKLM\Software\Microsoft\Windows\CurrentVersion\Run] '<File name>' = '"<Full path to file>"'
Creates or modifies the following files
- <SYSTEM32>\tasks\firefoxf
- <SYSTEM32>\tasks\firefox
- <SYSTEM32>\tasks\sppsvc
- <SYSTEM32>\tasks\wudfhostw
- <SYSTEM32>\tasks\wudfhost
- <SYSTEM32>\tasks\sppsvcs
- <SYSTEM32>\tasks\smss
- <SYSTEM32>\tasks\<File name>l
- <SYSTEM32>\tasks\smsss
- <SYSTEM32>\tasks\<File name>
Malicious functions
To complicate detection of its presence in the operating system,
adds antivirus exclusion:
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:\kms\sppsvc.exe'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath '%ProgramFiles%\Windows Media Player\WUDFHost.exe'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:\kms\firefox.exe'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath '%LOCALAPPDATA%\Microsoft Help\firefox.exe'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/Windows/'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/Users/'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/uihm/'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/System Volume Information/'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/Recovery/'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/ProgramData/'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/Program Files (x86)/'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/Program Files/'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/PerfLogs/'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/MSOCache/'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/kms/'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/Documents and Settings/'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath 'C:/$Recycle.Bin/'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath '%ProgramFiles%\Reference Assemblies\Microsoft\Framework\v3.5\RedistList\smss.exe'
- '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -Command Add-MpPreference -ExclusionPath '<Full path to file>'
Modifies file system
Creates the following files
- <Current directory>\9ff439d9524037
- %TEMP%\hk4wedmekx
- %TEMP%\wuyky4nz.out
- %TEMP%\wuyky4nz.cmdline
- %TEMP%\wuyky4nz.0.cs
- %LOCALAPPDATA%\microsoft help\0fc223bdacedc3
- %LOCALAPPDATA%\microsoft help\firefox.exe
- %TEMP%\ruptfclmwr.bat
- C:\kms\0fc223bdacedc3
- %ProgramFiles%\windows media player\480b7989c529f6
- %ProgramFiles%\windows media player\wudfhost.exe
- C:\kms\0a1fd5f707cd16
- C:\kms\sppsvc.exe
- %ProgramFiles%\reference assemblies\microsoft\framework\v3.5\redistlist\69ddcba757bf72
- %ProgramFiles%\reference assemblies\microsoft\framework\v3.5\redistlist\smss.exe
- C:\kms\firefox.exe
- nul
Deletes the following files
- %TEMP%\wuyky4nz.cmdline
- %TEMP%\wuyky4nz.out
- %TEMP%\wuyky4nz.0.cs
- %TEMP%\hk4wedmekx
Moves the following files
- from %ProgramFiles%\microsoft office\office14\bcssync.exe to %ProgramFiles%\microsoft office\office14\bcssync.exe.exe
Miscellaneous
Restarts the analyzed sample
Executes the following
- '<SYSTEM32>\schtasks.exe' /create /tn "firefoxf" /sc MINUTE /mo 7 /tr "'%LOCALAPPDATA%\Microsoft Help\firefox.exe'" /f
- '<SYSTEM32>\cmd.exe' /C "%TEMP%\RUpTFclmWR.bat"
- '<SYSTEM32>\schtasks.exe' /create /tn "<File name>l" /sc MINUTE /mo 10 /tr "'<Full path to file>'" /rl HIGHEST /f
- '<SYSTEM32>\schtasks.exe' /create /tn "<File name>" /sc ONLOGON /tr "'<Full path to file>'" /rl HIGHEST /f
- '<SYSTEM32>\schtasks.exe' /create /tn "<File name>l" /sc MINUTE /mo 9 /tr "'<Full path to file>'" /f
- '<SYSTEM32>\schtasks.exe' /create /tn "smsss" /sc MINUTE /mo 7 /tr "'%ProgramFiles%\Reference Assemblies\Microsoft\Framework\v3.5\RedistList\smss.exe'" /rl HIGHEST /f
- '<SYSTEM32>\schtasks.exe' /create /tn "smss" /sc ONLOGON /tr "'%ProgramFiles%\Reference Assemblies\Microsoft\Framework\v3.5\RedistList\smss.exe'" /rl HIGHEST /f
- '<SYSTEM32>\schtasks.exe' /create /tn "smsss" /sc MINUTE /mo 6 /tr "'%ProgramFiles%\Reference Assemblies\Microsoft\Framework\v3.5\RedistList\smss.exe'" /f
- '<SYSTEM32>\schtasks.exe' /create /tn "sppsvcs" /sc MINUTE /mo 13 /tr "'C:\kms\sppsvc.exe'" /rl HIGHEST /f
- '<SYSTEM32>\schtasks.exe' /create /tn "sppsvc" /sc ONLOGON /tr "'C:\kms\sppsvc.exe'" /rl HIGHEST /f
- '<SYSTEM32>\chcp.com' 65001
- '<SYSTEM32>\schtasks.exe' /create /tn "sppsvcs" /sc MINUTE /mo 9 /tr "'C:\kms\sppsvc.exe'" /f
- '<SYSTEM32>\schtasks.exe' /create /tn "WUDFHost" /sc ONLOGON /tr "'%ProgramFiles%\Windows Media Player\WUDFHost.exe'" /rl HIGHEST /f
- '<SYSTEM32>\schtasks.exe' /create /tn "WUDFHostW" /sc MINUTE /mo 8 /tr "'%ProgramFiles%\Windows Media Player\WUDFHost.exe'" /f
- '<SYSTEM32>\schtasks.exe' /create /tn "firefoxf" /sc MINUTE /mo 5 /tr "'C:\kms\firefox.exe'" /rl HIGHEST /f
- '<SYSTEM32>\schtasks.exe' /create /tn "firefox" /sc ONLOGON /tr "'C:\kms\firefox.exe'" /rl HIGHEST /f
- '<SYSTEM32>\schtasks.exe' /create /tn "firefoxf" /sc MINUTE /mo 8 /tr "'C:\kms\firefox.exe'" /f
- '%WINDIR%\microsoft.net\framework64\v4.0.30319\csc.exe' /noconfig /fullpaths @"%TEMP%\wuyky4nz.cmdline"
- '<SYSTEM32>\schtasks.exe' /create /tn "firefoxf" /sc MINUTE /mo 9 /tr "'%LOCALAPPDATA%\Microsoft Help\firefox.exe'" /rl HIGHEST /f
- '<SYSTEM32>\schtasks.exe' /create /tn "firefox" /sc ONLOGON /tr "'%LOCALAPPDATA%\Microsoft Help\firefox.exe'" /rl HIGHEST /f
- '<SYSTEM32>\schtasks.exe' /create /tn "WUDFHostW" /sc MINUTE /mo 6 /tr "'%ProgramFiles%\Windows Media Player\WUDFHost.exe'" /rl HIGHEST /f
- '<SYSTEM32>\ping.exe' -n 10 localhost
- '%WINDIR%\microsoft.net\framework64\v4.0.30319\csc.exe' /noconfig /fullpaths @"%TEMP%\wuyky4nz.cmdline"' (with hidden window)
- '<SYSTEM32>\cmd.exe' /C "%TEMP%\RUpTFclmWR.bat"' (with hidden window)
