This means that decryption of the attacker’s communication is possible once the RC4 key has been retrieved from a compromised system. In the sample analysed by NCC Group the same fixed string is used to initialise RC4 for both transmit and receive.
IRC FREENODE FULL
Three magic packets are required to trigger the backdoor this initiates an outbound connection from the compromised system to the sender of the magic packets.Ī full TCP connection is not required to activate the backdoor – three individual packets for the port knocking sequence will successfully start the sequence below.ĭata transmitted between the attacker and compromised server is encrypted by RC4 at all times.
The backdoor has a number of components which provide the attacker root shell functionality or remote access to any file. The backdoor discussed in this post avoids these issues by using a novel method for recognising specially generated incoming packets, bypassing most typical host firewalls and enabling the attacker to change IP address without losing access. Tools which periodically connect outbound to a server are usually limited to a small number of addresses or a predictable domain generation algorithm.
IRC FREENODE HOW TO
One difficulty all attackers face after compromising a system is how to retain control over a long period of time in a stealthy manner.īackdoor tools which listen for incoming connections can be easily identified by a port scan or by listing open sockets. In this post we discuss a subset of the information we documented about one of the components involved in the compromise, specifically a Linux backdoor with some interesting functionality and features.
IRC FREENODE PRO
NCC Group’s Cyber Defence Operations team provided pro bono digital forensic and reverse engineering services to assist the freenode infrastructure team with their incident response activities.
IRC FREENODE SOFTWARE
Special thanks to Shane (mrinfinity) for help with the edits.Freenode is a large IRC network providing services to Free and Open Source Software communities, and in September the freenode staff team blogged about a potential compromise of an IRC server. Of the Joseon Empire, the oldest nation in the world since 1392 We welcome everyone who believes this world can be built better and provide a better life for everyone. We welcome everyone who wishes for a world where the people are in power as both the governor and the governed. We welcome everyone in the entire world who wishes for liberty and financial equality to come join us. The internet changed everything and leveled the playing field. This time, instead of this awful cycle of disempowerment of the people, it's time that the people of the world, together, plant the flag of the power of the people on the Internet. Division and segregation, the oldest play in the book, has presented itself yet again. The governments of yesterday, who protected free speech, have used security and safety to take away our very freedoms that are itself at risk. The world is inevitably never going back to the world from which we came.