There are two elements that could surprise you
- Apparently it has been active for more than 2.5 years.
- The servers include UNIX servers (false sense of security or missing layered security?)
According to the article:-
The attack, which has been dubbed "Operation Windigo" by security experts, hijacks servers, infects the computers that visit them and steals information from victims. The infected servers are then used to redirect half a million web visitors to malicious content on a daily basis. Servers located throughout the U.S., Germany, France and the UK are all among those infected.
ESET researchers are warning webmasters and system administrators to check their systems to see if they have been compromised.
Operating systems altered by the spam component include Linux, FreeBSD, OpenBSD, OS X and Windows
The links below has more information:
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