Detect Antivirus on Windows using C#

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Answer 1

According to Microsoft, The Windows Security Center uses a two-tiered approach for detection status. One tier is manual, and the other tier is automatic through Windows Management Instrumentation (WMI). In manual detection mode, Windows Security Center searches for registry keys and files that are provided to Microsoft by independent software manufacturers. These registry keys and files let Windows Security Center detect the status of independent software. In WMI mode, software manufacturers determine their own product status and report that status back to Windows Security Center through a WMI provider. In both modes, Windows Security Center tries to determine whether the following is true:

An antivirus program is present.

The antivirus signatures are up-to-date.

Real-time scanning or on-access scanning is turned on for antivirus programs.

For firewalls, Windows Security Center detects whether a third-party firewall is installed and whether the firewall is turned on or not.

So in order to determine the presence of an antivirus software, you can use the WMI making a connection to the rootSecurityCenter namespace (starting with windows Vista you must use the rootSecurityCenter2 namespace), and then query for the AntiVirusProduct WMI class.

Look at this sample code

using System;
using System.Text;
using System.Management;

namespace ConsoleApplication1
{
  class Program
  {
    public static bool AntivirusInstalled()
    {

      string wmipathstr = @"" + Environment.MachineName + @"
ootSecurityCenter";
      try
      {
        ManagementObjectSearcher searcher = new ManagementObjectSearcher(wmipathstr, "SELECT * FROM AntivirusProduct");
        ManagementObjectCollection instances = searcher.Get();
        return instances.Count > 0;
      }

      catch (Exception e)
      {
        Console.WriteLine(e.Message);
      }

      return false;
    } 

    public static void Main(string[] args)
    {
      bool returnCode = AntivirusInstalled();
      Console.WriteLine("Antivirus Installed " + returnCode.ToString());
      Console.WriteLine();
      Console.Read();
    }

  }
}