DNS data exfiltration involves two hosts sharing data over the internet without having a direct connection. DNS tunneling is a method threat actors will use to successfully encode and steal the data they are after. We evaluated the efficacy of our approach by: Our approach had the accuracy of 98% for both the cross-validation and testing phases. Quantifying the performance in real-time on a live 10 Gbps traffic stream from the two organizations. The DNSxD application is presented and its performance evaluated in comparison with the current exfiltration detection mechanisms. Real-Time Detection of DNS Exfiltration and Tunneling from Enterprise Networks. Reverse lookups can also be used to fetch the data responses. • DNS Tunnelinginvolves pushing of a non-standard protocol or DNS through data packets • Data exfiltration can be exploited through SQL and XML injection. In the previous lab, we looked at HTTP C2 channels. Threats from both external actors and insiders are becoming more sophisticated and organisations must respond with increased security measures. DNS is typically permitted out of corporate environments, and we can use it for C2 and exfiltration. DNS attacks cost finance firms millions of pounds a year – average cost of recovering from a single #DNS attack is $924,390 for a large financial services company, says @efficientip survey: https://t.co/6a5xFCWYpu, — ComputerWeekly (@ComputerWeekly) October 26, 2018. Required fields are marked *. Our solution is based on stateless attributes of fully qualified domain names (FQDNs). DNS Data Exfiltration - How it works. Although the detection of covert channels over the DNS has been thoroughly studied in the last decade, previous research dealt with a specific subclass of covert channels, namely . In a few weeks, I’ll be back to have a discussion about how different types of data analysis can be used to detect tunneling. 192.168.1.1) and vice versa. DNS is a Weak Link in Cyber Security Practices. Network Anomaly Detection in Prisma Cloud. Save my name, email, and website in this browser for the next time I comment. By using signatures for detection, we are able to make the detection instantly and with confidence that we are not rate limiting some valid (if strange) DNS traffic. In the section below, I will show you some ways to detect weirdness with DNS based on the techniques highlighted above. Attributes of DNS exfiltration query names: detected vs. undetected a virtual machine with 4 cores of CPU, 6GB of memory, and storage of 50GB. The key to prevent data exfiltration based on DNS tunneling is to detect the malicious query from single DNS request. Stories from the SOC - DNS recon + exfiltration. Web browsing and email use the important protocol, the Domain Name System (DNS), which allow s applications to function using names, such as example.com, instead of hard -to-remember IP addresses . Description. DNS Command & Control and DNS exfiltration can be successful because DNS is an integral part of the internet's infrastructure, and as such the outbound communications on DNS Port 53 from a high number of network hosts and/or servers must be allowed to communicate outside a network. Now that the Stream add-on is capturing the DNS data, we need a search to find Base64 encoded content in DNS queries. Guest Post: How DNSSEC Delegation Trust Maintenance can be automated via the DNS itself. DNS search for encoded data. The power that makes DNS beneficial for everyone also creates potential for abuse. enables detection of low-throughput data exfiltration over DNS [4]. In other words, they can detect and stop tunnels in either the inbound or outbound direction based on detection of a certain number of packets of a certain size per second. MITRE and there can be complex rules configured to easily detect this kind of exfiltration and other malicious actions that are carried over DNS (for example, C&C commands sent to malware over DNS queries) The scanner will detect vulnerable versions of JBoss, Weblogic and Jenkins. In general, considerable time is required to learn the structure of the data before clustering when using an unsupervised learning algorithm. Real-time detection of DNS exfiltration. Description. Although the detection of covert channels using the DNS has been studied for the past . Are You Confident of Your Cloud Security Posture? As we know, DNS is a giant White Pages or phone directory for the Internet. DNS tunneling is a technique used to exfiltrate data through features of the DNS protocol. You now need to set up monitoring so that this doesn't happen again. In the presence of security countermeasures, a malware designed for data exfiltration must use a covert channel to achieve its goal. One method of covert data exfiltration exploits a funda-mental service of the internet; that of the Domain Name System (DNS) protocol. We will assume basic familiarity with Linux/Windows command line and the ability of the reader to deploy the necessary frameworks.
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