respounder: detects presence of responder in the network

by do son · Published October 24, 2018 · Updated May 1, 2024

respounder

A tool that detects the presence of a Responder in the network
Identifies compromised machines before hackers run away with the loot (hashes)

It sends LLMNR name resolution requests for made-up hostnames that do not exist. In a normal non-adversarial network we do not expect such names to resolve. However, a responder, if present in the network, will resolve such queries and therefore will be forced to reveal itself.

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Usage

Running respounder is as simple as invoking it on the command line. Example invocation:

Flags

$ ./respounder [-json] [-debug] [-hostname testhostname | -rhostname]



Flags:

  -json

        Prints a JSON to STDOUT if a responder is detected on

        the network. Other text is sent to STDERR

  -debug

        Creates a debug.log file with a trace of the program

  -interface string

        Interface where responder will be searched (eg. eth0).

        Not specifying this flag will search on all interfaces.

  -hostname string

        Hostname to search for (default "aweirdcomputername")

  -rhostname

        Searches for a hostname comprised of random string instead

        of the default hostname ("aweirdcomputername")

Typical usage scenario

Personal

Detect rogue hosts running responder on public Wi-Fi networks e.g. like airports, cafés and avoid joining such networks (especially if you are running Windows OS)

Corporate

Detect network compromises as soon as they happen by running respounder in a loop

For eg., the following run crontab respounder every minute and log a JSON file to syslog whenever a responder is detected.

* * * * * /path/to/respounder -json | /usr/bin/logger -t responder-detected

Example syslog entry:

Demo

Source: https://github.com/codeexpress/

respounder: detects presence of responder in the network

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