The OWASP Amass Project is written in go which is much faster than python and it performs network mapping of attack surfaces and external asset discovery using open source information gathering and active reconnaissance techniques.You can also perform scripting with the amass engine for greater control over the enumeration process.You can perform in-depth DNS, ASN numbers and subdomain enumeration and also other assets owned by an organization using amass.
If you are in ubuntu system for installation:
snap install amass
For any other debian distribution:
apt-get install amass
You can see here for the installation instructions :
Type amass -h for help
In general amass comes with 5-sub commands. They are:
amass intel - Discover targets for enumerations
amass enum - Perform enumerations and network mapping
amass viz - Visualize enumeration results
amass track - Track differences between enumerations
amass db - Manipulate the Amass graph database
amass dns - Resolve DNS names at high performance
Supports 55 sources, such as APIs and websites, at the time of writing as part of its subdomain discovery and information gathering techniques. These can be listed using the following command:
amass enum -list
Then, it will list the sources for gathering the information.
The intel subcommand can help you discover additional root domain names associated with the organization you are investigating. The data source sections of the configuration file are utilized by this subcommand in order to obtain passive intelligence, such as reverse whois information.
Amass intel -h
This subcommand will perform DNS enumeration and network mapping while populating the selected graph database. All the setting available in the configuration file are relevant to this subcommand.
create enlightening network graph visualizations that add structure to the information gathered. This subcommand only leverages the 'output_directory' and remote graph database settings from the configuration file.
The files generated for visualization are created in the current working directory and named amass_TYPE
This sub-command will represent the DNS and Infrastructure findings in graph view like the maltego tool.
Shows differences between enumerations that included the same target(s) for monitoring a target's attack surface. This subcommand only leverages the 'output_directory' and remote graph database settings from the configuration file.
Performs viewing and manipulation of the graph database. This subcommand only leverages the 'output_directory' and remote graph database settings from the configuration file.
Amass has several files that it outputs during an enumeration (e.g. the log file). If you are not using a database server to store the network graph information, then Amass creates a file based graph database in the output directory. These files are used again during future enumerations, and when leveraging features like tracking and visualization.
By default, the output directory is created in the operating system default root directory to use for user-specific configuration data and named amass. If this is not suitable for your needs, then the subcommands can be instructed to create the output directory in an alternative location using the '-dir' flag.
If you decide to use an Amass configuration file, it will be automatically discovered when put in the output directory and named config.ini.
A brief user guide and tutorial of amass :