What is botnet?

Botnets are networks of compromised computers called zombies or bots that are controlled remotely by an attacker known as a bot herder. Originally bots were useful tools but now are used for malicious purposes. A botnet has four main components: the bot herder who installs bot software on vulnerable systems, the bots or zombies, an IRC server for communication, and a command and control server to issue instructions. The bot herder builds their botnet army by infecting home and small business computers. Once installed, bots communicate secretly with the C&C server to receive tasks like DDoS attacks, spamming, phishing and stealing information.

The document discusses vulnerability assessment and tools used in the assessment process. It defines vulnerability assessment as a systematic evaluation of asset exposure to threats, and describes the key aspects of identification, threat evaluation, vulnerability appraisal, risk assessment, and risk mitigation. It then outlines various tools that can be used in assessment, including port scanners, protocol analyzers, vulnerability scanners, and software development assessment techniques.

This document discusses denial of service (DoS) and distributed denial of service (DDoS) attacks. It defines DoS as an attack that seeks to oversaturate a targeted machine's capacity to disrupt authorized use, while a DDoS uses multiple compromised systems to flood the target. The document describes how DDoS attacks work by flooding the victim from many sources, making it hard to block. It lists common DoS attacks like buffer overflow and ICMP floods, and DDoS attack types like traffic floods and application attacks. The document also covers typical attacker motivations and recommendations to prevent attacks like buying more bandwidth and building redundancy.

This document outlines a presentation on botnets. It begins with introducing key botnet terminology like bot herder, bot, and command and control channel. It then covers the botnet lifecycle before discussing how botnets pose a threat to network security. The document outlines how botnets are used for DDoS attacks, spam, and other crimes. It discusses approaches for botnet detection including using honeynets and traffic monitoring. The document concludes by emphasizing the growing threat of botnets to cybersecurity.

This document provides an overview of distributed denial of service (DDoS) attacks. It discusses the components and architecture of DDoS attacks and classifies them into four categories: flood attacks, amplification attacks, TCP SYN attacks, and malformed packet attacks. Specific attack types like UDP floods, ICMP floods, Smurf attacks and Fraggle attacks are described. The document also covers DDoS defense problems and classifications such as intrusion prevention, detection, tolerance and response. It concludes that DDoS attacks are difficult to prevent due to readily available tools and the ability to target any internet host, and that the best defense involves vigilant system administration.

This document discusses denial of service (DoS) and distributed denial of service (DDoS) attacks. It defines DoS attacks as attempts to render a system unusable or slow it down for legitimate users by overloading its resources. DDoS attacks multiply the effectiveness of DoS by using multiple compromised computers to launch attacks simultaneously. Common DoS attack types like SYN floods, Smurf attacks, and ping of death are described. The rise of botnets, which are networks of compromised computers controlled remotely, enabled more powerful DDoS attacks. Mitigation strategies include load balancing, throttling traffic, and using honeypots to gather attacker information.

Port scanning involves sending packets to ports on a target system to discover which ports are open and may be exploited. There are several common port scanning techniques like TCP connect scanning, SYN scanning, FIN scanning, and UDP scanning. Port scanners try to avoid detection by scanning slowly, spoofing packets, or fragmenting packets. Systems can detect port scans through signatures like many connections to different ports from the same source in a short time.

This presentation is about Ransomware. It tells you about how ransomware creates problem and how it can be removed. It also describes different types of Ransomware.

The presentation covers information about basic and advanced ddos attacks; the tools, techniques and methods to perform them and how to prevent them using the methods present in TCP/IP. Given the different network and application protocols for tcp/ip; we tried to describe where ddos attacks are made possible in the communication process . Each attack is seperately analyzed and described and defense technique is described using the same analogy. Our motto: If there is a ddos case, there was a way to defend it.