Technical Information
To ensure autorun and distribution:
Modifies the following registry keys:
- [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'Windows Update' = '<SYSTEM32>\S3rver.exe'
Malicious functions:
To bypass firewall, removes or modifies the following registry keys:
- [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile] 'DoNotAllowExceptions' = '00000000'
- [<HKLM>\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile] 'EnableFirewall' = '00000000'
To complicate detection of its presence in the operating system,
forces the system hide from view:
- hidden files
blocks execution of the following system utilities:
- Command Prompt (CMD)
Creates and executes the following:
- %TEMP%\xchat-2.8.9.exe
- %TEMP%\S3rver.exe
Executes the following:
- <SYSTEM32>\netsh.exe firewall set opmode disable
Terminates or attempts to terminate
the following user processes:
- bdagent.exe
- zlclient.exe
- AVP.EXE
- outpost.exe
Modifies file system :
Creates the following files:
- %TEMP%\nsr3.tmp\modern-wizard.bmp
- %TEMP%\nsr3.tmp\ioSpecial.ini
- <SYSTEM32>\S3rver.exe
- %TEMP%\nsr3.tmp\InstallOptions.dll
- %TEMP%\xchat-2.8.9.exe
- %TEMP%\S3rver.exe
- %TEMP%\nsr3.tmp\System.dll
- %TEMP%\nsb2.tmp
Miscellaneous:
Searches for the following windows:
- ClassName: 'Indicator' WindowName: ''
- ClassName: 'Shell_TrayWnd' WindowName: ''
