Phishers Use Wildcard DNS to Build Convincing Bait URLs – Spamfo

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From Across the Pond, written by Andrew Robinson over at Spamfo:

Phishing operations have begun using DNS wildcards and URL encoding to create email links that display the URLs of legitimate banking sites, but send victims to spoof sites designed to steal their login details. This may sound familiar as it is not unlike the eBay phishing bug on which Aunty reported just yesterday.

A wildcard DNS record (*.example.com) will resolve all requests that are not matched by any other record. Wildcards are typically used to manage errant or mistyped e-mail addresses, but have been routinely abused by spammers.

In recent weeks wildcard DNS settings have been used in a wave of phishing attacks on Barclays Bank, in which the “bait” email included URLs starting with barclays.co.uk, followed by a lengthy sequence of letters and symbols. Several examples:

http://barclays.co.uk|snc9d8ynusktl2wpqxzn1anes89gi8z.dvdlinKs.at/pgcgc3p/
http://barclays.co.uk|YJ3EMOHOqljQ8J5oW2ZKyTaRMQOahSWaxTrFTEQK9l9VVQj6jDtyq10d24r2h0bijh2
http://barclays.co.uk|34fdcb4rvdnp9phxbahhvbs6l56a2uyx%2edivxmovies%2ea%74/41pvaw3/

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The phishers use…

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