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https://github.com/splunk/security_content
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Patrick Bareiss
31 lines
1.6 KiB
YAML
31 lines
1.6 KiB
YAML
name: Dynamic DNS
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id: 8169f17b-ef68-4b59-aae8-586907301221
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version: 2
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date: '2018-09-06'
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description: Detect and investigate hosts in your environment that may be communicating
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with dynamic domain providers. Attackers may leverage these services to help them
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avoid firewall blocks and blacklists.
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narrative: Dynamic DNS services (DDNS) are legitimate low-cost or free services that
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allow users to rapidly update domain resolutions to IP infrastructure. While their
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usage can be benign, malicious actors can abuse DDNS to host harmful payloads or
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interactive-command-and-control infrastructure. These attackers will manually update
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or automate domain resolution changes by routing dynamic domains to IP addresses
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that circumvent firewall blocks and blacklists and frustrate a network defender's
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analytic and investigative processes. These searches will look for DNS queries made
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from within your infrastructure to suspicious dynamic domains and then investigate
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more deeply, when appropriate. While this list of top-level dynamic domains is not
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exhaustive, it can be dynamically updated as new suspicious dynamic domains are
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identified.
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author: Bhavin Patel, Splunk
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type: ESCU
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references:
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- https://www.fireeye.com/blog/threat-research/2017/09/apt33-insights-into-iranian-cyber-espionage.html
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- https://umbrella.cisco.com/blog/2013/04/15/on-the-trail-of-malicious-dynamic-dns-domains/
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- http://www.noip.com/blog/2014/07/11/dynamic-dns-can-use-2/
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- https://www.splunk.com/blog/2015/08/04/detecting-dynamic-dns-domains-in-splunk.html
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tags:
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analytics_story: Dynamic DNS
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usecase: Security Monitoring
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category:
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- Malware
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