msgbartop
Unmask Parasites - Check your web pages for hidden links, iframes, malicious scripts, unauthorized redirects and other signs of security problems.
msgbarbottom
Loading site search ...

Google Image Poisoning. What’s New in June?

29 Jun 11   Filed in Website exploits with 3 Comments

This is the second (more techie) part in the series of posts about a new wave of the Google Image poisoning attack. This part will heavily refer to the detailed description of the attack that I made back in May. Most of the aspects are still true so I will only talk about changes here. If you want to have a complete picture, I suggest that you read the original description first.

Changed doorway behavior

After May 18th, I noticed that doorway pages no longer redirected me anywhere when I clicked on poisoned search results. Neither to bad sites nor to home pages of compromised sites. Instead they displayed the spammy content generated for search engine crawlers only.

That was strange. That could never happen if the old algorithm was still in use.

Then I checked the cache directories (./.log/compromiseddomain.com/) and found new maintenance files there: don.txt and xml.txt. The don.txt file contained HTML template of spammy pages and was a replacement for the shab100500.txt file used by the original algorithm. The xml.txt contained the following string: bG92ZS1ibG9nY29tLm5ldA==, which decoded (base64) to “love-blogcom.net“. It was clear it was a more secure replacement for xmlrpc.txt that stored the domain name of a remote malicious server in plain text.

A few days later, the xml.txt files was replaced by xml.cgi, which was a clever step since .cgi files produce server errors when you try to open them in directories that aren’t configured to execute CGI scripts.

So I knew that the doorway script was updated, but I couldn’t understand why the doorways exhibited no malicious behavior when I clicked on hijacked image search results. That didn’t make much sense. What was the purpose of showing those spammy unintelligible pages without trying to monetize the traffic? The only plausible idea was they were playing the “long game” and needed some time to have the new pages rank well without risks of being identified as cloaked or malicious content, and when many pages reach prominent positions in search results they’ll start redirect web searchers to bad sites. Well, that was a working hypothesis until I got the source code of the new doorway script. The reality is crooks don’t want to play “long games” if they can monetize right away – the new doorway pages did redirect to bad site but my virtual environment wasn’t properly configured to trigger the redirects.
Continue – Dissecting the updated Google Image poisoning attack »»

Two Tweet Weeks: June 13-26, 2011

27 Jun 11   Filed in Tweet Week with Comments Off

Selected short messages and links you might have missed if you don’t follow me on Twitter.

Blocked .CC subdomains, Joomla hack, WordPress future incompatibility, outdated versions and compromised plugins »»

Google Image Poisoning. Mitigation and the New Wave.

23 Jun 11   Filed in General, Short Attack Reviews with 1 Comment

In May, I wrote a big article about my investigation of a massive Google Image poisoning attack. A quick recap: cybercriminals created millions of doorway pages on dozens of thousands compromised websites. Those pages exploited a flaw in Google Image search algorithm that made it possible for pages with hot-linked images to hijack search results of websites where the images actually belonged to. The attack scheme was very efficient and hundreds of thousand (if not millions) people clicked on poisoned image search results every day.

Not only did I publish results of my investigation on my blog but also shared a great deal of gathered information (lists of compromised sites, algorithms, etc.) with Google and antivirus vendors. I hope this made some difference as I started observe changes literally the next day after the article publication.

In this 2-part series of posts, I will talk about what’s changed since then. Specifically about how Google addressed this problem (part I) and how cybercriminals changed the attack scheme (part II).
Continue »»

Two Tweet Weeks: May 30 – June 12, 2011

13 Jun 11   Filed in Tweet Week with Comments Off

Selected short messages and links you might have missed if you don’t follow me on Twitter.

SEO poisoning, Mac FakeAV vs PC FakeAV, the state of badware report, Readable SafeBrowsing addon …

Two Tweet Weeks: May 16-29, 2011

30 May 11   Filed in Tweet Week with Comments Off

Selected short messages and links you might have missed if you don’t follow me on Twitter.

SEO poisoning, canonical hacks, SmartScreen, WordPress, Facebook clickjacking …

Unmasking “Canonical” Hacks

22 May 11   Filed in Unmask Parasites with Comments Off

As a follow up to the recent Matt Cutt’s tweet and blog post about emerging rel=canonical hacks, I did a detailed guest post on StopBadware blog about this problem.

In that article, I wrote about how such hacks work and how cyber-criminals can use this hard-to-detect attack to hijack search results of compromised sites. You can also find a short review of a real “rel=canonical” attack that affected quite a few websites.

As always, I wrote about tools and techniques that can help you diagnose hacks that try to make Google think that your site has moved to a new domain name. Unfortunately, at this point no tools that I know of specifically check for rogue “rel=canonical” instructions. However, more universal file integrity monitoring solutions can be really efficient as they will inform about any unexpected modifications.
Continue (how Unmask Parasites reveals rel=canonical hacks) »»

Tweet Week: May 9-15, 2011

16 May 11   Filed in Tweet Week with Comments Off

Selected short messages and links you might have missed if you don’t follow me on Twitter.

Google Image poisoning: articles, domains, statistics; free and dangerous WP themes, 1K subscribers …

Imgaaa .net And Other Blacklisted Domains Used in Google Image Search Poisoning

08 May 11   Filed in Short Attack Reviews with 8 Comments

This is a short follow up on my post about hacked sites that poisoned Google Image search results.

As I mentioned in that post, most compromised sites where hackers created malicious doorway pages, contained one of the following images or iframes in their legitimate index pages.
Continue »»

Thousands of Hacked Sites Seriously Poison Google Image Search Results

05 May 11   Filed in Website exploits with 47 Comments

This investigation began a few weeks ago, when I came across the following two threads in website security forums:

[badwarebusters.org] Lately I have been seeing a huge increase in the number of hacked sites appearing on google image search results that redirect to a fake Av scanner. more »»

[Google Webmaster Help] google image search results often has multiple infected / malware sites on the first SERP page. more »»

This is a well known problem. I blogged about such SEO poisoning attacks several times here. This time I decided to check what’s behind the reported increase in malicious image search results.
Continue »»

Tweet Week: March 14-20, 2011

21 Mar 11   Filed in Tweet Week with Comments Off

Selected short messages and links you might have missed if you don’t follow me on Twitter.

Best practices for hosting providers, security statistics, basicpills in WordPress, Rustock, phishing …