• Some browsers share code bases with Google Chrome, and we collaborate with those browser vendors.
• We develop generic fuzzers that are applicable to most browsers and that we want to share with others.
• We spend time analyzing behavior in different browsers, and we sometimes discover bugs in the process.
• It benefits our users and the Internet as a whole if we work collaboratively on better web browser security.

A recent surge in compromised web servers has generated many interesting discussions in online forums and blogs. We thought we would join the conversation by sharing what we found to be the most popular malware sites in the last two months.

As we've discussed previously, we constantly scan our index for potentially dangerous sites. Our automated systems found more than 4,000 different sites that appeared to be set up for distributing malware by massively compromising popular web sites. Of these domains more than 1,400 were hosted in the .cn TLD. Several contained plays on the name of Google such as goooogleadsence.biz, etc.

1. What is the current listing status for [the site in question]?
   
   We display the current listing status of a site and also information on how often a site or parts of it were listed in the past.
   


2. What happened when Google visited this site?
   
   This section includes information on when we analyzed the page, when it was last malicious, what kind of malware we encountered and so fourth.   To help web masters clean up their site, we also provide information about the sites that were serving malicious software to users and which sites might have served as intermediaries.
   


3. Has this site acted as an intermediary resulting in further distribution of malware?
   
   Here we provide information if this site has facilitated the distribution of malicious software in the past. This could be an advertising network or statistics site that accidentally participated in the distribution of malicious software.


4. Has this site hosted malware?
   
   Here we provide information if the the site has hosted malicious software in the past. We also provide information on the victim sites that initiated the distribution of malicious software.

1. people need to actually review the code


2. developers/reviewers need to know how to write secure code
   


3. once found, security problems need to be fixed quickly, and their fixes distributed quickly

The API is still experimental, but we hope it will be useful to ISPs, web-hosting companies, and anyone building a site or an application that publishes or transmits user-generated links. Sign up for a key and let us know how we can make the API better. We fully expect to iterate on the design and improve the data behind the API, and we'll be paying close attention to your feedback as we do that. We look forward to hearing your thoughts.

In addition to targeting malware, we're interested in combating phishing, a social engineering attack where criminals attempt to lure unsuspecting web surfers into logging into a fake website that looks like a real website, such as eBay, E-gold or an online bank. Following a successful attack, phishers can steal money out of the victims' accounts or take their identities. To protect our users against phishing, we publish a blacklist of known phishing sites. This blacklist is the basis for the anti-phishing features in the latest versions of Firefox and Google Desktop. Although blacklists are necessarily a step behind as phishers move their phishing pages around, blacklists have proved to be reasonably effective.

Not all phishing attacks target sites with obvious financial value. Beginning in mid-March, we detected a five-fold increase in overall phishing page views. It turned out that the phishing pages generating 95% of the new phishing traffic targeted MySpace, the popular social networking site. While a MySpace account does not have any intrinsic monetary value, phishers had come up with ways to monetize this attack. We observed hijacked accounts being used to spread bulletin board spam for some advertising revenue. According to this interview with a phisher, phishers also logged in to the email accounts of the profile owners to harvest financial account information. In any case, phishing MySpace became profitable enough (more than phishing more traditional targets) that many of the active phishers began targeting it.

Interestingly, the attack vector for this new attack appeared to be MySpace itself, rather than the usual email spam. To observe the phishers' actions, we fed them the login information for a dummy MySpace account. We saw that when phishers compromised a MySpace account, they added links to their phishing page on the stolen profile, which would in turn result in additional users getting compromised. Using a quirk of the CSS supported in MySpace profiles, the phishers injected these links invisibly as see-through images covering compromised profiles. Clicking anywhere on an infected profile, including on links that appeared normal, redirected the user to a phishing page. Here's a sample of some CSS code injected into the "About Me" section of an affected profile:

• Learn to recognize and avoid phishing. The Anti-Phishing Working Group has a good list of recommendations.
  


• Update your software regularly and run an anti-virus program. If a cyber-criminal gains control of your computer through a virus or a software security flaw, he doesn't need to resort to phishing to steal your information.
  


• Use different passwords on different sites and change them periodically. Phishers routinely try to log in to high-value targets, like online banking sites, with the passwords they steal for lower-value sites, like webmail and social networking services.

Reduce the attack surface

Treat virtual machines as services that can be compromised

Keep software up to date