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Techniques for Blindly Mapping Internal Networks

Posted on September 2, 2020

Occasionally consumers require that each one community and system discovery is finished absolutely blind during inner pentests meaning no IP addresses are offered. I know that numerous people were uncovered to ping and port scan discovery recommendations, but on large networks those strategies alone can be pretty time eating. So during this blog I concept I would provide some time saving alternatives that can be utilized along side the traditional strategies. This blog can be interesting to network directors, protection mavens, and anyone else who wants to learn a few more ways to blindly discover live subnets and systems. I recognize that there are many strategies that can be used to discover active networks and systems, but I won’t be capable of cover they all here.

I’m in reality completely sure that I don’t know them all anyways. Regardless, what I will cover are the 10 common discovery options listed below. They should build on one another in way that confidently starts to make sense as you walk via the manner. Sniffing is a very good passive method for mapping networks and systems. Typically, you’ll see a lot of broadcast traffic consisting of DNS, NBNS, BROWSER, and Cisco protocols that reveal hostnames, active subnets, VLANS, and domains.

Also, sniffing could be a handy way to find a sound IP address if DHCP is not configured on the network. Usually after watching traffic styles for a bit bit that you would be able to examine a gateway and a subnet. Then, after a bit trial and mistake, you’ll want to be able to assign your self a static IP tackle that will let you behavior more active community mapping. Of course there are quite of few sniffing tools that can be utilized, but on Windows I like Wireshark, Network Miner, and Cain. Also, TCPDump and Tshark can be handy for scripting on both Windows and Linux. Regardless of the OS or tool you choose, make sure to sniff in promiscuous mode to assist be sure that you don’t miss any network traffic.

Below are basic examples for starting Tshark and TCPDump and writing the output to a file. The next aim is to determine live networks that exist among you and the subnets you’ve identified so far. To do that we’ll use traceroute. Traceroute is a diagnostic tool that can give route information using ICMP. In Linux the tools is called traceroute in Windows its call tracert.

I put forward simply tracerouting to the gateway or DNS server for every network in its place of tracerouting every system. Either way, be sure to add the newly recognized networks to that list of subnets you’ve been collecting. Below is another quick and dirty script example. Note: This can take a while, particularly when you have a long list of networks to trace. I in most cases I limit the variety of hops to 10 for many networks to avoid wasting some time.

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