More than a week after we reported deceptive search engine ads being used in Bitcoin wallet attacks, fraudsters are still using Bing ads to trick Blockchain users into visiting phishing sites — but this time, the ads are using some crude social engineering ploys.

Searching for "blockchain" on bing.com currently displays the following pair of phishing ads at the top of the search results:

"Other ads are all phishing site" – click this one!

(Page requested at 12:15 BST, 2nd July 2014)

The first ad begs the user to "click this one" and warns that all other ads are phishing sites, but clicking on the ad actually sends the victim to a Blockchain phishing site, where he is prompted to enter his identifier and password. This phishing site is hosted in a subdirectory on a compromised website, which belongs to a web development outsourcing company in India.

Similarly, the second phishing ad warns that the other one is a phishing site; however, the fraudster behind this ad has made a mistake. When a victim clicks on this ad, it will try to send him to blockchain.lnfo (.LNFO). This link won't work because the .lnfo top-level domain does not exist, and probably never will, because as the fraudster has so perfectly demonstrated, it could easily be confused with .info.

As we saw in previous attacks, the green display URLs shown in these ads are carefully chosen by the fraudster to look similar to the real Blockchain website, which uses the blockchain.info domain. Neither of the display URLs accurately reflect the actual location reached after clicking on the ads. Also, the blue link text on the second ad uses an i-acute character in place of the "i" in Blockchain, presumably to make it harder to detect misuse of the Blockchain brand.

The fact that these phishing ads are trying to discredit each other suggests that there are multiple Bitcoin fraudsters competing for click-through traffic on sites which display Bing ads. These phishing ads also appear on other search engines which use the Yahoo Bing ad network, such as Yahoo and DuckDuckGo.

A phishing ad displayed on the privacy-conscious DuckDuckGo search engine.