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The Wayback Machine - https://web.archive.org/web/20211208180124/https://security.googleblog.com/2012/06/
Security Blog
The latest news and insights from Google on security and safety on the Internet
Safe Browsing - Protecting Web Users for 5 Years and Counting
June 19, 2012
Posted by Niels Provos, Security Team
It’s been five years since we officially announced
malware and phishing protection
via our Safe Browsing effort. The goal of Safe Browsing is still the same today as it was five years ago: to protect people from malicious content on the Internet. Today, this protection extends not only to Google’s search results and ads, but also to popular web browsers such as Chrome, Firefox and Safari.
To achieve comprehensive and timely detection of new threats, the Safe Browsing team at Google has labored continuously to adapt to rising challenges and to build an infrastructure that automatically detects harmful content around the globe.
For a quick sense of the scale of our effort:
We protect 600 million users through built-in protection for Chrome, Firefox, and Safari, where we show several million warnings every day to Internet users.
You may have seen our telltale red warnings pop up — when you do, please don’t go to sites we've flagged for malware or phishing. Our free and public
Safe Browsing API
allows other organizations to keep their users safe by using the data we’ve compiled.
We find about 9,500 new malicious websites every day.
These are either innocent websites that have been compromised by malware authors, or others that are built specifically for malware distribution or phishing. While we flag many sites daily, we strive for high quality and have had only a handful of false positives.
Approximately 12-14 million Google Search queries per day show our warning
to caution users from going to sites that are currently compromised. Once a site has been cleaned up, the warning is lifted.
We provide malware warnings for about 300 thousand downloads per day
through our
download protection service
for Chrome.
We send thousands of notifications daily to webmasters.
Signing up with
Webmaster Tools
helps us communicate directly with webmasters when we find something on their site, and our ongoing partnership with
StopBadware.org
helps webmasters who can't sign up or need additional help.
We also send thousands of notifications daily to Internet Service Providers (ISPs) &
CERTs
to help them keep their networks clean.
Network administrators can sign up
to receive frequent alerts.
By protecting Internet users, webmasters, ISPs, and Google over the years, we've built up a steadily more sophisticated understanding of web-based malware and phishing. These aren’t completely solvable problems because threats continue to evolve, but our technologies and processes do, too.
From here we’ll try to hit a few highlights from our journey.
Phishing
Many phishers go right for the money, and that pattern is reflected in the continued heavy targeting of online commerce sites like eBay & PayPal. Even though we’re still seeing some of the same techniques we first saw 5+ years ago, since they unfortunately still catch victims, phishing attacks are also getting more creative and sophisticated. As they evolve, we improve our system to catch more and newer attacks (Chart 1). Modern attacks are:
Faster
- Many phishing webpages (URLs) remain online for less than an hour in an attempt to avoid detection.
More diverse
- Targeted “spear phishing” attacks have become increasingly common. Additionally, phishing attacks are now targeting companies, banks, and merchants globally (Chart 2).
Used to distribute malware
- Phishing sites commonly use the look and feel of popular sites and social networks to trick users into installing malware. For example, these rogue sites may ask to install a binary or browser extension to enable certain fake content.
(Chart 1)
(Chart 2)
Malware
Safe Browsing identifies two main categories of websites that may harm visitors:
Legitimate websites that are compromised in large numbers so they can deliver or redirect to malware (Chart 3).
Attack websites that are specifically built to distribute malware are used in increasing numbers (Chart 4).
When a legitimate website is compromised, it’s usually modified to include content from an attack site or to redirect to an attack site. These attack sites will often deliver "
Drive by downloads
" to visitors. A drive by download exploits a vulnerability in the browser to execute a malicious program on a user's computer without their knowledge.
Drive by downloads install and run a variety of malicious programs, such as:
Spyware to gather information like your banking credentials.
Malware that uses your computer to send spam.
(Chart 3)
Attack sites are purposely built for distributing malware and try to avoid detection by services such as Safe Browsing. To do so, they adopt several techniques, such as rapidly changing their location through free web hosting, dynamic DNS records, and automated generation of new domain names (Chart 4).
(Chart 4)
As companies have designed browsers and plugins to be more secure over time, malware purveyors have also employed social engineering, where the malware author tries to deceive the user into installing malicious software without the need for any software vulnerabilities. A good example is a “Fake Anti-Virus” alert that masquerades as a legitimate security warning, but it actually infects computers with malware.
While we see socially engineered attacks still trailing behind drive by downloads in frequency, this is a fast-growing category likely due to improved browser security.
How can you help prevent malware and phishing?
Our system is designed to protect users at high volumes (Chart 5), yet here are a few things that you can do to help:
Don't ignore our warnings.
Legitimate sites are commonly modified to contain malware or phishing threats until the webmaster has cleaned their site. Malware is often designed to not be seen, so you won't know if your computer becomes infected. It’s best to wait for the warning to be removed before potentially exposing your machine to a harmful infection.
Help us find bad sites.
Chrome users can select the check box on the red warning page. The data sent to us helps us find bad sites more quickly and helps protect other users.
Register your website
with
Google Webmaster Tools
. Doing so helps us inform you quickly if we find suspicious code on your website at any point.
(Chart 5)
Looking Forward
The threat landscape changes rapidly. Our adversaries are highly motivated by making money from unsuspecting victims, and at great cost to everyone involved.
Our tangible impact in making the web more secure and our ability to directly protect users from harm has been a great source of motivation for everyone on the Safe Browsing team. We are also happy that our free data feed has become the de facto base of comparison for academic research in this space.
As we look forward, Google continues to invest heavily in the Safe Browsing team, enabling us to counter newer forms of abuse. In particular, our team supplied the technology underpinning these recent efforts:
Instantaneous
phishing detection and download protection
within the Chrome browser
Chrome extension malware scanning
Android application protection
For their strong efforts over the years, I thank Panayiotis Mavrommatis, Brian Ryner, Lucas Ballard, Moheeb Abu Rajab, Fabrice Jaubert, Nav Jagpal, Ian Fette, along with the whole Safe Browsing Team.
Microsoft XML vulnerability under active exploitation
June 12, 2012
Posted by Andrew Lyons, Security Engineer
Today Microsoft issued a
Security Advisory
describing a vulnerability in the Microsoft XML component. We discovered this vulnerability—which is leveraged via an uninitialized variable—being actively exploited in the wild for targeted attacks, and we reported it to Microsoft on May 30th. Over the past two weeks, Microsoft has been responsive to the issue and has been working with us. These attacks are being distributed both via malicious web pages intended for Internet Explorer users and through Office documents. Users running Windows XP up to and including Windows 7 are known to be vulnerable.
As part of the advisory, Microsoft suggests installing a
Fix it solution
that will prevent the exploitation of this vulnerability. We strongly recommend Internet Explorer and Microsoft Office users immediately install the Fix it while Microsoft develops and publishes a final fix as part of a future advisory.
Security warnings for suspected state-sponsored attacks
June 5, 2012
Posted by Eric Grosse, VP Security Engineering
We are constantly on the lookout for malicious activity on our systems, in particular attempts by third parties to log into users’ accounts unauthorized. When we have specific intelligence—either directly from users or from our own monitoring efforts—we show clear warning signs and put in place extra roadblocks to thwart these bad actors.
Today, we’re taking that a step further for a subset of our users, who we believe may be the target of state-sponsored attacks. You can see what this new warning looks like here:
If you see this warning it does not necessarily mean that your account has been hijacked. It just means that we believe you may be a target, of phishing or malware for example, and that you should take immediate steps to secure your account. Here are some things you should do immediately: create a unique password that has a good mix of capital and lowercase letters, as well punctuation marks and numbers; enable 2-step verification as additional security; and update your browser, operating system, plugins, and document editors. Attackers often send links to fake sign-in pages to try to steal your password, so be careful about where you sign in to Google and look for
https://accounts.google.com/
in your browser bar. These warnings are not being shown because Google’s internal systems have been compromised or because of a particular attack.
You might ask how we know this activity is state-sponsored. We can’t go into the details without giving away information that would be helpful to these bad actors, but our detailed analysis—as well as victim reports—strongly suggest the involvement of states or groups that are state-sponsored.
We believe it is our duty to be proactive in notifying users about attacks or potential attacks so that they can take action to protect their information. And we will continue to update these notifications based on the latest information.
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