Bscan : An Asynchronous Target Enumeration Tool

Bscan is a command-line utility to perform active information gathering and service enumeration.

At its core, bscan asynchronously spawns processes of well-known scanning utilities, repurposing scan results into highlighted console output and a well-defined directory structure.

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Installation

It was written to be run on Kali Linux, but there is nothing inherently preventing it from running on any OS with the appropriate tools installed. There’s a few different types of packaged releases and ways to install them.

The easiest way to get up and running is to install the appropriate single-file executable version of the program for your operating system (no Python installation required):

on Linux (i.e., Kali)
wget -O bscan https://releases.brianwel.ch/bscan/linux
on Windows
powershell -c “[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; wget ‘https://releases.brianwel.ch/bscan/windows’ -OutFile ‘bscan.exe'”
to download a specific version, use the following pattern
wget -O bscan https://releases.brianwel.ch/github/bscan/linux/0.1.4

You can also download the latest packaged version from PyPI (note that this requires an existing Python 3.6+ installation);

pip install bscan

Similarly, you could get the bleeding-edge version from version control:

pip install https://github.com/welchbj/bscan/archive/master.tar.gz

Basic Usage

bscan has a wide variety of configuration options which can be used to tune scans to your needs. Here’s a quick example:

$ bscan \
–max-concurrency 3 \
–patterns [Mm]icrosoft \
–status-interval 10 \
–verbose-status \
scanme.nmap.org

What’s going on here?

• –max-concurrency 3 means that no more than 3 concurrent scan subprocesses will be run at a time
• –patterns [Mm]icrosoft defines a custom regex pattern with which to highlight matches in the generated scan output
• –status-interval 10 tells bscan to print runtime status updates every 10 seconds
• –verbose-status means that each of these status updates will print details of all currently-running scan subprocesses
• scanme.nmap.org is the host upon which we want to enumerate

bscan also relies on some additional configuration files. The default files can be found in the bscan/configuation directory and serve the following purposes:

• patterns.txt specifies the regex patterns to be highlighted in console output when matched with scan output
• required-programs.txt specifies the installed programs that bscan plans on using
• port-scans.toml defines the port-discovering scans to be run on the target(s), as well as the regular expressions used to parse port numbers and service names from scan output
• service-scans.toml defines the scans be run on the target(s) on a per-service basis

Detailed Options

Here’s what you should see when running bscan –help:

usage: bscan [OPTIONS] targets
an asynchronous service enumeration tool
positional arguments:
targets the targets and/or networks on which to perform enumeration
optional arguments:
-h, –help show this help message and exit
–brute-pass-list F filename of password list to use for brute-forcing
–brute-user-list F filename of user list to use for brute-forcing
–cmd-print-width I the maximum integer number of characters allowed when printing the command used to spawn a running subprocess (defaults to 80)
–config-dir D the base directory from which to load the configuration files; required configuration files missing from this directory will instead be loaded from the default files shipped with this program
–hard force overwrite of existing directories
–max-concurrency I maximum integer number of subprocesses permitted to be running concurrently (defaults to 20)
–no-program-check disable checking the presence of required system programs
–no-file-check disable checking the presence of files such as configured wordlists
–no-service-scans disable running scans on discovered services
–output-dir D the base directory in which to write output files
–patterns [ [ …]] regex patterns to highlight in output text
–ping-sweep enable ping sweep filtering of hosts from a network range before running more intensive scans
–quick-only whether to only run the quick scan (and not include the thorough scan over all ports)
–qs-method S the method for performing the initial TCP port scan; must correspond to a configured port scan
–status-interval I integer number of seconds to pause in between printing status updates; a non-positive value disables updates (defaults to 30)
–ts-method S the method for performing the thorough TCP port scan; must correspond to a configured port scan
–udp whether to run UDP scans
–udp-method S the method for performing the UDP port scan; must correspond to a configured port scan
–verbose-status whether to print verbose runtime status updates, based on frequency specified by --status-interval flag
–version program version
–web-word-list F the wordlist to use for scans