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EV is a tool that allows you to craft TCP packets and leverage some well-known TCP/IP packet manipulation techniques to evade IDS devices. It supports HTTP protocol but unfortunately not HTTPS protocol. The handshake process of TLS is quite complicated and I haven’t figured out how to craft TLS packets elegantly. This tool is written in Python and QT5, using Scapy to make packets. So though this software is tested on the Windows platform only, it theoretically works on other platforms like Linux or MacOS. Fill IP, Port, and Payload fields and click the “Send” button to send the TCP packet to the target. You can also set TCP options and source port. Remember that TCP options are tcp options supported by scapy. You can view response packets in the “Received packets” window and click the packet to view it in the “View Received Packet” window. This is implemented by scapy’s sniff() function, it finds packets that match the target IP or is ICMP protocol(so that you can find TTL exceeded packets). However, sniff() sometimes records packets duplicately. So I strongly recommend users use WireShark if you’ve installed one to see received packets. Request Split You can use TCP Segmentation and IP Fragmentation to break the TCP packet into pieces and send them to the target. This may defeat IDS devices that don’t support TCP/IP reassembly. Increasing wait time or sending packets out of order may also circumvent IDS devices who has a very limited capability in TCP/IP reassembly. Sending Distractor Packets Distractor packets are packets that might be ignored by the target and be recognized by IDS devices. Small TTL distractor packets are packets’ TTL are subtracted to 0 between the IDS device and the target. The target will not receive this packet because the packet has been dropped before reaching the target. But IDS might think that the packet arrives at the target. Therefore, sending small TTL distractor packets containing junk data or RST flags may distract the process of reassembling TCP packets, leading to an evasion. Bad Checksum packets are packets with the wrong TCP checksum. Packets with the wrong checksum are ignored by the target, but IDS devices may not calculate the checksum and reassemble all packets directly, which leads to an evasion. Corrupt ack distractor packets are packets’ ACK field is corrupted. The target ignores such packets because of the wrong ACK field, but IDS might reassemble all packets directly, which leads to an evasion. [hide][Hidden Content]]

Ethical Hacking: Evading IDS, Firewalls, and Honeypots — Lynda — Updated 2/10/2021 Ethical hacking—testing to see if an organization’s network is vulnerable to outside attacks—is a desired skill for many IT security professionals. In this course, cybersecurity expert Malcolm Shore prepares you to take your first steps into testing client defenses. Malcolm provides you with an overview of firewall technology, detailing how firewalls work in both Windows and Linux, as well as how to set up a firewall simulation in a GNS3 network. Next, he goes over web application firewalls, API gateway threat mitigation solutions, and how to use honeypots to detect intruders. Finally, he covers the main ways to manage a suspected intrusion, including how to use the Security Onion intrusion detection system (IDS). Note: The topics covered in this course are drawn from the Evading IDS, Firewalls, and Honeypots competency in the Certified Ethical Hacker (CEH) body of knowledge. Topics include: Applying the basics of the Windows Firewall Using advanced features in the Windows Firewall Reviewing firewall logs Linux iptables Setting up an iptables firewall Managing rules with Firewall Builder Setting up a Cisco PIX firewall Installing GNS3 How web application firewalls protect web servers Protecting API services with the WSO2 gateway Running the Cowrie honeypot Detecting intrusions with Security Onion [Hidden Content]] [hide][Hidden Content]]

Ethical hacking—testing to see if an organization's network is vulnerable to outside attacks—is a desired skill for many IT security professionals. In this course, cybersecurity expert Malcolm Shore prepares you to take your first steps into testing client defenses. Malcolm provides you with an overview of firewall technology, detailing how firewalls work in both Windows and Linux, as well as how to set up a firewall simulation in a GNS3 network. Next, he goes over web application firewalls, API gateway threat mitigation solutions, and how to use honeypots to detect intruders. Finally, he covers the main ways to manage a suspected intrusion, including how to use the Security Onion intrusion detection system (IDS). Note: The topics covered in this course are drawn from the Evading IDS, Firewalls, and Honeypots competency in the Certified Ethical Hacker (CEH) body of knowledge. Topics include: Applying the basics of the Windows Firewall Using advanced features in the Windows Firewall Reviewing firewall logs Linux iptables Setting up an iptables firewall Managing rules with Firewall Builder Setting up a Cisco PIX firewall Installing GNS3 How web application firewalls protect web servers Protecting API services with the WSO2 gateway Running the Cowrie honeypot Detecting intrusions with Security Onion [Hidden Content] [hide][Hidden Content]]

Trend Micro Deep Discovery Inspector suffers from a percent encoding IDS bypass vulnerability. View the full article

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SNORT ids is a advance intrusion detection system that will detect all sorts of malicious attacks. Link: [Hidden Content] * Works with redhat Linux and Windows.