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Neat! How is this different than domaintools/farsight [1]? Passive DNS [2] has been in my toolbox for 15+ years, and is invaluable for security research / thre
by genmud 2y ago
Neat! How is this different than domaintools/farsight [1]?
Passive DNS [2] has been in my toolbox for 15+ years, and is invaluable for security research / threat intelligence. Knowing historical resolutions to something are so helpful in investigations.
For anyone interested, they should check out the talk by one of the DomainTools people [3] on how it can be utilized for investigation.
Are you passively collecting this data, or actively querying for these records?
[1] - https://www.domaintools.com/products/threat-intelligence-feeds/domain-visibility/farsight-nad/ https://www.domaintools.com/products/threat-intelligence-fee...
[2] - https://www.circl.lu/services/passive-dns/ https://www.circl.lu/services/passive-dns/
[3] - https://www.youtube.com/watch?v=oXmapqLkZd0 https://www.youtube.com/watch?v=oXmapqLkZd0
- Eikon 2y agoFrom what I understand [1] is just tlds, not subdomains?
- lyu07282 2y agois this making use of letsencrypt as well? afaik all letsencrypt signed certificates including all subdomains are immediately public, which could be useful for security research as well
- Eikon 2y agoIt's not about letsencrypt but certificate transparency which works the same for all public CAs. I wrote a documentation piece here: https://www.merklemap.com/documentation/how-it-works https://www.merklemap.com/documentation/how-it-works
- whalesalad 2y agoAt first glance it looks like this data is generated via the public certificate transparency log, so I would imagine the answer is yes.