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The vast majority of attacks against your network come under the heading of social engineering the process of using or manipulating people inside the networking environment to gain access to that network from the outside The term social engineering covers the many ways humans can use other humans to gain unauthorized information This unauthorized information may be a network login, a credit card number, company customer data almost anything you might imagine that one person or organization may not want a person outside of that organization to access Social engineering attacks aren t hacking at least in the classic sense of the word although the goals are the same Social engineering is where people attack an organization through the people in the organization or physically access the organization to get the information they need NOTE It s common for these attacks to be used together, so if you discover one of them being used against your organization, it s a good idea to look for others The most classic form of social engineering is the telephone scam, where someone calls a person and tries to get him to reveal his user name/password combination In the same vein, someone may physically enter your building under the guise of someone who might have legitimate reason for being there, such as cleaning personnel, repair technicians, or messengers He then snoops around desks, looking for whatever he has come to find (one of many good reasons not to put passwords on your desk or monitor)
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He might talk with people inside the organization, gathering names, office numbers, or department names little things in and of themselves, but powerful tools when combined later with other social engineering attacks These old-school social engineering tactics are taking a backseat to a far more nefarious form of social engineering: phishing
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In a phishing attack, the attacker poses as some sort of trusted site, like an online version of your bank or credit card company, and solicits you to update your financial information, such as a credit card number You might get an e-mail message, for example, that purports to be from PayPal telling you that your account needs to be updated and provides a link that looks like it goes to http://billingpaypalcom Clicking the link http://billingpaypall com (note the extra l in the name), you might end up at a site that resembles the PayPal billing site, but is actually http://wwwmerchntaccountcom, a phishing site
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Denial of Service (DoS) attacks are the work of hackers whose only interest is in bringing a network to its knees This is accomplished by flooding the network with so many requests that it becomes overwhelmed and ceases functioning These attacks are most commonly performed on Web and e-mail servers, but virtually any part of a network can be attacked via some DoS method The secret to a successful DoS attack is to send as many packets as possible against the victim Not only do you want to send a lot of packets, you want the packets to contain some kind of request that the victim must process as long as possible to force the victim to deal with each attacking packet for as long as possible There s a number of ways to get a good DoS going, but the CompTIA Network+ objectives expressly mention a smurf attack A smurf attack is a form of DoS that sends broadcast PINGs to the victim Not only that, the source IP of the PINGs is changed from the real system sending the packet to another (often, nonexistent) machine Smurf attacks are no longer a menace because almost all network devices now know not to forward broadcast PINGs EXAM TIP A smurf attack is a form of DoS that sends broadcast PINGs to the victim Far more menacing than a simple DoS attack are Distributed Denial of Service (DDoS) attacks A DDoS uses multiple (eg, hundreds to hundreds of thousands) of computers under the control of a single operator to send a devastating attack DDoS operators don t own these computers, but instead use malware to take control of computers A single computer under the control of an operator is called a zombie A group of computers under the control of one operator is called a botnet NOTE Zombified computers aren t obvious DDoS operators often wait weeks or months after a computer s been infected to take control of it
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