adding OSINT resources

osint/README.md

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+# Open Source
+
+Open-source intelligence (OSINT) is data collected from open source and publicly available sources. The following are a few OSINT resources and references:
+
+* [GOSINT](https://github.com/ciscocsirt/gosint) - a project used for collecting, processing, and exporting high quality indicators of compromise (IOCs). GOSINT allows a security analyst to collect and standardize structured and unstructured threat intelligence.
+* [Awesome Threat Intelligence](https://github.com/santosomar/awesome-threat-intelligence) - A curated list of awesome Threat Intelligence resources. This is a great resource and I try to contribute to it.
+* [Umbrella (OpenDNS) Popularity List](http://s3-us-west-1.amazonaws.com/umbrella-static/index.html) - most queried domains based on passive DNS usage across our Umbrella global network of more than 100 Billion requests per day with 65 million unique active users, in more than 165 countries.

useful_commands_and_scripts/dns_recon.md

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+# DNS Reconnassaince
+
+## DNSRECON
+* [dnsrecon](https://github.com/darkoperator/dnsrecon) - DNS Enumeration Script created by Carlos Perez (darkoperator)
+
+Reverse lookup for IP range:
+`./dnsrecon.rb -t rvs -i 10.1.1.1,10.1.1.50`
+
+Retrieve standard DNS records:
+`./dnsrecon.rb -t std -d example.com`
+
+Enumerate subdornains:
+`./dnsrecon.rb -t brt -d example.com -w hosts.txt`
+
+DNS zone transfer:
+`./dnsrecon -d example.com -t axfr`
+
+
+## Parsing NMAP Reverse DNS Lookup
+
+`nmap -R -sL -Pn -dns-servers dns svr ip range | awk '{if( ($1" "$2" "$3)=="NMAP scan report")print$5" "$6}' | sed 's/(//g' | sed 's/)//g' dns.txt `