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Botnet

A botnet is a network of compromised machines that an attacker controls to launch coordinated attacks such as distributed denial-of-service floods and large-scale spam campaigns. Understanding how botnets operate is essential for recognizing and defending against some of the most common threats in modern cybersecurity.

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About this video

A botnet is a network of computers that have been compromised and brought under the control of a malicious actor. Because the attacker can issue commands to all of these machines simultaneously, the combined power of the network can be directed at a single target, making botnets one of the most effective tools for executing large-scale cyberattacks. This centralized model of control is commonly described as a command-and-control architecture, and it is what distinguishes a botnet from isolated, individual threats. One of the most well-known uses of a botnet is carrying out a distributed denial-of-service attack, in which every machine in the network floods a target system with requests at the same time. The volume of traffic overwhelms the target, causing it to slow down or become completely unavailable to legitimate users. Beyond denial-of-service attacks, botnets are also widely used to send mass spam campaigns. By routing messages through hundreds or thousands of different machines, the attacker conceals the true origin of the emails and increases the likelihood of bypassing spam filters. These two use cases illustrate why botnets represent a significant and persistent threat that security professionals must be equipped to identify and counter.

What you'll learn

Explain how botnets are used to conduct distributed denial-of-service attacks and large-scale spam campaigns
Describe the command-and-control model that enables an attacker to coordinate multiple compromised machines simultaneously

What's covered

Botnets

What is a Botnet
- Network of bots
- Controlled machines
- Command and control
Denial of Service Attacks
- Flood target with requests
- Distributed attack (DDoS)
- Overwhelm victim machine
Spam Campaigns
- Send bulk spam emails
- Hide attacker identity
- Bypass spam filtering

Key terms

Botnet: A network of compromised computers controlled by an attacker, often used to conduct distributed attacks.
Distributed Denial of Service: An attack that uses multiple systems to flood a target with traffic, making it unavailable to legitimate users.
Denial of Service: An attack that floods a system or network with traffic to make it unavailable to legitimate users.
Command and Control: Command and Control refers to the infrastructure and communication channels used by attackers to issue instructions to and receive data from compromised systems, enabling persistent access and coordinated attack operations.
Spam: Spam is unsolicited bulk electronic messages, most commonly email, that serve as a primary delivery vector for phishing campaigns, malware attachments, and social engineering attacks.

Topics

Botnet Ddos Command And Control Malware Cybersecurity Spam Campaigns

Transcript

Botnets

Some software that I can use to carry out an attack would be a botnet, a network of bots. In this case, the bots are going to be these machines right here, and because there's many of them, we're going to call this a network of bots.

Having this type of control over a network of bots allows me to launch certain types of attacks, such as denial of service attacks. What I can do is I can control these machines to tell them to all flood this machine right here, all at the same time, with a series of requests, overwhelming this machine. I can do this because I've got control over so many different machines.

You can think of the term as being bots — so like robots that you control, and it's a network of them. I'm able to control all of these at the same time, launching my attack on wherever the victim is. There's an element of control that you have over these machines, so you could consider it a type of command and control.

Not only can I carry out things like a distributed denial of service attack, where I'm overwhelming a machine, but maybe I want to send out a bunch of spam emails and I don't want people to know that's coming from me, or I want to get past some sort of spam filtering. So I can use a lot of different machines to send the spam messages out.

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