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Windows Scam Site Blocker

Block potential windows scam sites

目前为 2018-10-31 提交的版本。查看 最新版本。

// ==UserScript==
// @name         Windows Scam Site Blocker
// @namespace    blockWinScamSites
// @version      1.0
// @description  Block potential windows scam sites
// @author       Kai Krause <[email protected]>
// @include      *
// @exclude      microsoft.com/*
// @exclude      *.microsoft.com
// @grant        GM_setValue
// @grant        GM_getValue
// @run-at       document-start
// ==/UserScript==

// Whether to block the page
var shouldBlockPage = false;

function main() {
	// Products and keywords that are normally used in headers
	var products = ["microsoft", "windows"];
	var keywords = ["error", "security", "warning", "official", "support", "hotline", "virus", "infected", "infection", "blocked"];

	// Get the page's title
	var title = document.title.toLowerCase();

	// Loop whether a product and keywords exist together
	for (let i = 0; i < products.length; i++) {
		if (title.includes(products[i])) {
			for (let x = 0; x < keywords.length; x++) {
				if (title.includes(keywords[x])) {
					shouldBlockPage = true;
				}
			}
		}
	}

	// If the page hasn't been blocked, use flags until a decision is made
	var redFlags = 0;

	// If the page is related to a product, flag it
	for (let i = 0; i < products.length; i++) {
		if (title.includes(products[i])) {
			redFlags++;
		}
	}

	// Get all inline script tags, and check whether they contain obfuscated JS techniques
	var scripts = document.getElementsByTagName(script);
	for (let i = 0; i < scripts.length; i++) {
		var script = scripts[i].innerText;
		if (script.Includes("eval")) redFlags++;
		if (script.Includes("unescape")) redFlags++;
		if (script.Includes("fromCharCode")) redFlags++;
		if (script.Includes("charCodeAt")) redFlags++;
	}

	// Block the page if there are too many red flags
	if (redFlags >= 2) {
		shouldBlockPage = true;
	}

	// Otherwise, scan the page for commonly uses phrases
	var phrases = ["your computer has been blocked", "your computer has alerted us", "call microsoft toll free", "windows has detected", "your system detected", "please call microsoft", "ransomware virus has infected your system", "trying to steal financial information", "information is being stolen", "removal process over the phone", "prevent your computer from being disabled", "contact our certified", "windows technician", "pornographic spyware", "malicious virus", "malicious malware"];

	// Get page content
	var page = document.body.innerText.toLowerCase();

	// Detect phrases
	for (let i = 0; i < phrases.length; i++) {
		if (page.indexOf(phrases[i]) > -1) {
			shouldBlockPage = true;
		}
	}
}

// Block the page, by clearing it's content and replacing it
var finishedBlocking = false;
function blockPage() {
	if (shouldBlockPage && !finishedBlocking) {
		window.stop();
		document.getElementsByTagName('head')[0].innerHTML = "<title>" + document.title + "</title>";
		document.body.innerHTML = "<h1>This Page Has Been Blocked - It Appeared To Be Malicious</h1><br />"
		document.body.innerHTML += "<button id='ignorePage'>Ignore Warning</button>";
		document.getElementById("ignorePage").addEventListener("click", ignorePage);
		finishedBlocking = true;
	}
}

// ignore pages by domain name, handled via GM storage
function ignorePage() {
	if (GM_setValue) {
		GM_setValue(location.hostname, "ignored");
		location.reload();
	}
}

// check if page is ignored
var isPageIgnored = GM_getValue(location.hostname);

// run code blocks
var runTime = Date.now();
if (isPageIgnored !== "ignored") {
	var interval = setInterval(function() {
		main();
		blockPage();
		// Remove interval if page has been blocked, or, the script has run for longer than 3 seconds
		if(shouldBlockPage || (Date.now() - runTime) / 1000 >= 3) {
			console.log("ending script")
			return clearInterval(interval);
		}
	}, 10);
}