Friday, June 30, 2017

Prevent Petya/Petwrap/NotPetya Ransomware Attack

This week, new ransomware called Petrwrap (NotPetya) attacked Windows PC across the globe today. It locks hard drive MFT and MBR sections and preventing computers from booting. Unless victims opted to pay hacker $300 by BitCoin (which is not recommended), there was no way to recover their systems.

Unfortunately Amit Serper (a security expert) has found a way to prevent the Petya(NotPetya/SortaPetya/Petna) ransomware from infecting computers. The solution is create C:\Windows\perfc file and make it read only. This batch file can help you for quickly: It also creates perfc.dat and perfc.dll for more secure. Let run it with Administrator right:

Here are emails which are used to send infected attached files (don't open email when receiving from theses emails):
Another required actions are:
  • Let update your Windows, especially patches for MS17-010, CVE 2017-0199.
  • Disable SMB port: 445/137/138/139
  • Remove WMIC (Windows Management Instrumentation Command-line) tool
Hope you are safe after this attack storm!

Thursday, June 22, 2017

Create a Luis Chat Bot on Azure Bot Service - Part 2

In Part 1, you already knew how to create an Azure Chat Bot and deploy it from a local repository. In this article, I'll show you how to apply a Luis app into the bot and how to integrate it with Facebook Messenger.

1. Go to website and create an app.
This Luis app will be used for a Pizza shop, so we create 3 intents: greeting, pizza and noservice. We also create an simple entity named topping:

And below are utterances for intents:
Here are another samples of utterances for pizza intent (you should map label topping every time inputting):
can i have pizza with pineapple and bacon
i would like a pizza with cheese bacon and pineapple
may i have pizza with pineapple and sausage
can i get tomato with cheese on my pizza
my pizza should have goat cheese and mozzarella on it

You can add more utterances. After inputting data, click Train & Test link and click Train Application button. Then keying sentences into Interactive Testing box:

If the training & test are ok, let publish the app:

2. Congratulation! You already had first Luis app, let link it with your bot service on Azure. Open the bot on Azure, click on SETTINGS tab and select the Luis app then click Save changes button:

Now, we will enhance the bot with power from the Luis app. Below is the code of the bot, it will recognize intents & entities from chat message to make corresponding response:

"use strict";
var builder = require("botbuilder");
var botbuilder_azure = require("botbuilder-azure");
var useEmulator = (process.env.NODE_ENV == 'development');
var connector = useEmulator ? new builder.ChatConnector() : new botbuilder_azure.BotServiceConnector({
appId: process.env['MicrosoftAppId'],
appPassword: process.env['MicrosoftAppPassword'],
stateEndpoint: process.env['BotStateEndpoint'],
openIdMetadata: process.env['BotOpenIdMetadata']

var bot = new builder.UniversalBot(connector);
var luisAppId = process.env.LuisAppId;
var luisAPIKey = process.env.LuisAPIKey;
var luisAPIHostName = process.env.LuisAPIHostName || '';

const LuisModelUrl = 'https://' + luisAPIHostName + '/luis/v2.0/apps/' + luisAppId + '?subscription-key=' + luisAPIKey + '&verbose=true';

var recognizer = new builder.LuisRecognizer(LuisModelUrl);

var intents = new builder.IntentDialog({ recognizers: [recognizer] })
.matches('None', (session, args) => {
    session.send('Hello, welcome to Pizza Shop. How may I help you?');
.matches('greeting', (session, args) => {
    session.send('Hello, welcome to Pizza Shop. How may I help you?');
.matches('pizza', (session, args) => {
    var topping = builder.EntityRecognizer.findEntity(args.entities, 'topping');
    if(topping) session.send('Thank you for ordering. Your pizza with %s will be delivered to you in 30 minutes.', topping.entity);
    else session.send('Thank you for ordering. Would you like your pizza with anything else?');
.matches('noservice', (session, args) => {
    session.send('Thank you for ordering but we only sell pizza. Comeback later if you want a pizza.');
.onDefault((session, args) => {
    session.send('Sorry! I am a support bot, I did not understand \'%s\'. Please call XXXXX, our staff will be happy to help you.', session.message.text);

bot.dialog('/', intents);

if (useEmulator) {
    var restify = require('restify');
    var server = restify.createServer();
    server.listen(3978, function() {
        console.log('test bot endpont at http://localhost:3978/api/messages');
    });'/api/messages', connector.listen());

    } else {
        module.exports = { default: connector.listen() }

Ok, let see our bot working:

3. We now have a bot serving our Pizza Shop, let connect it with Facebook so our customers can order pizza via Facebook messenger :)

To do that, you must have a Facebook Page and a Facebook Application. In the case of you don't have your Facebook Page, you can read this article for how to. If you don't have any Facebook Application, you can read here to register one.

Assuming that you already had your Facebook Application, go to link and open the application. Below is mine for example:

(Picture 1)

In the above picture, I already added Messenger product into my app. If you don't add yet, click + Add Product link >> find Messenger product then click Get Started button to add (see the following picture).

After that, go to, open your bot on MS Bot Framework, find Facebook Messenger in Add a channel section then click to add and configure it. Scroll down to Callback URL and Verify Token for Facebook and copy values of Callback URL and Verify Token. They will be used for configuring Webhooks on your Facebook Application.

(Picture 2)

Back to the Facebook Application, click Setup Webhooks button to verify the callback URL of your bot:
(Picture 3)

Provide values copied from your bot (Picture 2) in to the opened box, select Subscription Fields (events) you want:

And click Verify and Save button. When done, let select your Facebook Page and click Subscribe button to subscribe the webhook to the page events:

To enable your app to send and receive messages using your Facebook Page for everyone coming to your page (public), you must add pages_messaging and submit to review (see this link for more info on this process) :

Otherwise you must add Developers or Testers for testing. You can do via Roles function:

Yeah! You finished necessary steps on Facebook. Return to the configuration of Facebook Messenger on your bot, let key values from Facebook into:

Facebook Page ID: find on the About menu of your Facebook Page:
Facebook App ID & App Secret: get from the dashboard of your Facebook App (Picture 1).
Page Access Token: get from Picture 3 when you select your page.

After keying above values, click Save button, your bot now is connected with Facebook Messenger:
It's time for talking with your bot. You can try via<Your Page ID> or use Facebook Messenger on your mobile:

Those are basic steps for creating your bot with MS Bot Framework and connect it with channels like Facebook Messenger. I hope you have a quick start for your bot.

Good luck! Any comment is welcome.

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