Passive reconnaissance is the process of collecting information in a covert manner about an intended target without the target knowing what is occurring.

Mainly is done searching information about the target on the Internet (Google, Linkedin, etc) and also searching for metadata (i.e. domain registers information, OSINT tools, etc).

• https://shodan.io

• https://censys.io

• https://pastebin.com

• https://archive.org/web/

• https://gist.github.com/search

• https://sitereport.netcraft.com/

• https://hunter.io Email recon

• https://www.netdb.io/ IOT search engine

• https://securitytrails.com/dns-trails DNS subdomains recon

• https://securityheaders.com/ HTTP headers recon

• https://www.wigle.net/ WIFI

• https://www.kitterman.com/spf/validate.html Validate SMTP SPF fields

• https://www.fraudmarc.com/dmarc-check Validate SMTP SPF/DMARC policies

• https://mxtoolbox.com/DMARC.aspx Validate SMTP SPF/DMARC policies

• https://dmarcian.com/dmarc-inspector/ Validate SMTP DMARC policy

• https://crt.sh Certificate Transparency Site
  

Another effective way to do passive recon is obviously through Google, actually there is a term for that: Google dorking or google dorks, you can read more about it below:

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How to use Google Dorks easily

Google Dork is an advanced Google search query using special commands such as allinurl, allintitle, etc to leverage Google to find public information. Is also a good way to perform passive reconnaissance. Offensive Security has the major Google Dork database called GHDB…

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2 years ago · pentesting.academy

Did I miss some great tool? Please add it in the comments below :)

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