This is quite common and helps to improve the availability and the resistance to failure. Fast Flux domains list:Īs we can see in the image, the domain “” resolves to multiple IP addresses. In addition, we have also listed the different operating systems (those that have been identified) and services running on each server, trying to locate common patterns between them. To better understand the operation of this network and obtain statistical data, we have automated certain processes to obtain the list of IP addresses for each Fast Flux domain. In addition to Fast Flux, Ursnif has also made use of the Tor network and servers have been located on it, but in this post, we will focus on the Fast Flux network itself. The domains shown in this post belong to the Ursnif botnet, which at the time of writing is still active thanks to the use of Fast Flux.Īlso known as Gozi, IFSB, and Prapas, Usnif is a banking Trojan that among its multiple functionalities performs web injections on banking sites, theft of credentials, intercepts keystrokes, and more. Our main objective is to shed some light on this type of network and what kind of activities are developed within. In this post we want to share details about a study that we have carried out on a Fast Flux network operated by the creators of the Ursnif malware. Its main function is to serve as a reverse proxy to hide the real destination of the requested resource. This technique is often used by malware creators in botnets and phishing sites and is used both on compromised servers – if they are accessible from the internet or its ports – or servers purchased for this purpose. Usually, two or more IP addresses per domain are used to improve availability. To accomplish this, the DNS record is given an exceptionally low TTL (time to live) so that the servers do not cache the domain. The technique works by changing the DNS records of type A for a given domain very frequently. Careers We’re hiring! Check out our current openingsįast Flux is a technique that was seen for the first time in 2007 – and that is still used today -which allows attackers to resist dismantling, the ability to hide the true command and control servers, phishing sites, malware or clandestine markets, and take on possible countermeasures and censorship.ESG Our principles and commitments as a global citizen.Customers Real-world examples of how Outpost24 helps businesses improve their security posture.Certifications Cybersecurity certifications and adherence to industry best practice standards.Company Overview Our mission to fight cybercrime, and who we are.Whitepapers Industry and best practice guides for securing your business.Videos & Webinars On-demand webinars and product videos.Datasheets Downloadable datasheets for products and services.Research In-depth reports compiled by KrakenLabs, our Threat Intelligence analysts.Security Awareness Training Complete solution to improve security resilience throughout your organization.Red Teaming Scenario-based attack simulations to reveal hidden threats.Penetration Testing Classic penetration testing on networks, web, and mobile applications.Managed Services Proactive security services for your network, endpoints, applications, and clouds.Web Application Security Testing Manual testing & automated scanning with continuous monitoring via pen testing as a service (PTaaS). Risk-based Vulnerability Management Vulnerability management with real-word threat intelligence to focus remediation & reduce business risk.External Attack Surface Management Attack surface discovery and monitoring in real-time with actionable insights.Cyber Threat Intelligence Digital risk protection with our modular, multi-tenant, subscription-based solution for any use case.
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