If you visited the web sites for Avira, AVG or WhatsApp this morning, you probably saw that they didn’t look like they should. All of them were defaced and looked like this:
It is a bit horrifying when you see such big sites, including security sites from major Anti Virus products (like AVG and Avira) getting compromised. But what really happened? Did they really get hacked?
DNS redirection
In a broader sense, they did get hacked, but not through a compromise on their servers or network. It looks like the attackers got access to their domains registration panels at Network Solutions and modified their name servers.
For example, these were the new name servers for Avira:
$ host -t NS avira.com avira.com name server ns1.radioum.com.br. avira.com name server n1.ezmail.com.br. avira.com name server n2.ezmail.com.br. avira.com name server ns2.radioum.com.br.
And these new names servers were pointing Avira’s IP address to 173.193.136.42, instead of the real IP address. That’s why visitors to the site were greeted with a defacement page.
What causes a bit of suspicion is that all these domains are hosted at Network Solutions, so we have to wait a bit more to see if it was caused by a breach on their end or something else.
This article was also posted on Sucuri Blog.