Detecting Malice by Robert Hansen

By Robert Hansen

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By Robert Hansen

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Note: Before NAT became popular as it is today most network-level proxies used a protocol called SOCKS. NAT prevailed because it is transparently deployed, whereas to use SOCKS you needed to extend each application to support it (and subsequently configure it). Part of the original theory of why RFC 1918 was valuable was that if an internal address is non-publiclyroutable, bad guys won’t be able to see where your users are really coming from within your network or route traffic to that address.

It could be software scraping your website for content (for example, harvesting email addresses). It could be a brute-force attack, requesting multiple usernames and passwords (this will be discussed in more depth later in this chapter and in later chapters). Finally, if your server has some sort of interactive media or serves up movies, it could also be a client that is 40 simply pulling a lot of data. Normally, that sort of client takes a while to initiate the scan, so activity will look more like Fig.

By querying the DNS server directly, an attacker can often find internal corporate IP addresses. com Any requests for internal addresses should be considered malicious reconnaissance, unless your internal users are required to use external DNS servers to resolve internal name resolution—a very bad practice indeed. Granted, the lines between internal and external websites are getting more and more blurry, but internal name resolution is still bad practice and should be considered a security risk.

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