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What is the preferred communication method used for a botnet?
Answer: Most bots communicate with their C&Cs using either one of two communications protocols – IRC (Internet Relay Chat) or HTTP (HyperText Transfer Protocol). Other botnets also employ other communication methods but these two are definitely the most commonly used.
How can IRC traffic be used to detect botnets?
One of the simplest methods of detecting IRC-based botnets is to offramp traffic from a live network on known IRC ports (e.g. TCP port 6667) and then inspect the payloads for strings that match known botnet commands. We detected at least three such botnets running on high-numbered ports in our honeypot experiment.
What is IRC in botnet?
Internet Relay Chat (IRC) networks use simple, low bandwidth communication methods. These collections of infected bots controlled over IRC channels are called IRC botnets and are still used by cybercriminals to spread malware and carry out small-scale DDoS attacks.
Why did Clickbot a communicate over HTTP?
A clickbot is a software robot that clicks on ads (issues HTTP requests for advertiser web pages) to help an attacker conduct click fraud. For- tunately, IP diversity usually is not enough to hide click fraud attacks conducted by such software, and traffic generated by them is identifiable.
Do any techniques exist to detect botnets?
Thus, it is possible to detect botnet DNS traffic by monitoring the DNS activities and detecting unusual or unexpected DNS querying. DNS based techniques are quietly similar to other anomaly based detection techniques. They are commonly based on detection of anomalous DNS network traffic generated by bot computers.
How does IRC botnet work?
An IRC Botnet is a collection of machines infected with malware that can be controlled remotely via an IRC channel. The Botnet operator, after appropriate checks, periodically moves the IRC bot to a new IRC channel to thwart researchers & automated sandboxes from monitoring the commands.
How is IRC different from a botnet?
Any time you send commands directly, you are much more directly discoverable, whereas a botnet using IRC is next to impossible to trace back And for ease of use, it is entirely text based – so commands can be easily sent and received.
How does an IRC server connect to an HTTP Server?
HTTP requests require the client to know the target server IP address. On the other hand, with IRC, the infected host would connect to a nearby “honest” IRC server, and, by the magic of data flow between IRC servers, the data may reach the C&C wherever it currently hides.
How are commands sent to a botnet?
Using the C&C service, the owner sends commands to one or more bots at a time. These commands can be sending spam, denial of service attacks, updating the client, looking for new devices to infect, and more.
Why are there so many commands on IRC?
These commands can be sending spam, denial of service attacks, updating the client, looking for new devices to infect, and more. IRC is not centralized like Twitter, Facebook, Discord, Slack, ICQ, which makes it harder to track, especially if a closed group runs their own IRC server.