OWASP Amass – DNS Enumeration, Attack Surface Mapping & External Asset Discovery

Last updated: February 10, 2020 | 6,013 views

The OWASP Amass Project is a DNS Enumeration, Attack Surface Mapping & External Asset Discovery tool to help information security professionals perform network mapping of attack surfaces and perform external asset discovery using open source information gathering and active reconnaissance techniques.

Information Gathering Techniques Used by OWASP Amass for DNS Enumeration and More

The main functionality of Amass is as follows:

DNS: Basic enumeration, Brute forcing (optional), Reverse DNS sweeping, Subdomain name alterations/permutations, Zone transfers (optional)
Scraping: Ask, Baidu, Bing, DNSDumpster, DNSTable, Dogpile, Exalead, Google, HackerOne, IPv4Info, Netcraft, PTRArchive, Riddler, SiteDossier, ViewDNS, Yahoo
Certificates: Active pulls (optional), Censys, CertSpotter, Crtsh, Entrust, GoogleCT
APIs: AlienVault, BinaryEdge, BufferOver, CIRCL, CommonCrawl, DNSDB, GitHub, HackerTarget, IPToASN, Mnemonic, NetworksDB, PassiveTotal, Pastebin, RADb, Robtex, SecurityTrails, ShadowServer, Shodan, Spyse (CertDB & FindSubdomains), Sublist3rAPI, TeamCymru, ThreatCrowd, Twitter, Umbrella, URLScan, VirusTotal, WhoisXML
Web Archives: ArchiveIt, ArchiveToday, Arquivo, LoCArchive, OpenUKArchive, UKGovArchive, Wayback

Usage of Amass for DNS Enumeration, Attack Surface Mapping & External Asset Discovery

The Amass tool has several subcommands shown below for handling your Internet exposure investigation.

intel – Collect open-source intelligence for investigation of the target organization
enum – Perform DNS enumeration and network mapping of systems exposed to the Internet
viz – Generate visualizations of enumerations for exploratory analysis
track – Compare results of enumerations against common target organizations
db – Manage the graph databases storing the enumeration results

Each subcommand has its own arguments, for example, the ‘intel’ subcommand.

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.

-active	Enable active recon methods
-addr	IPs and ranges (192.168.1.1-254) separated by commas
-asn	ASNs separated by commas (can be used multiple times)
-cidr	CIDRs separated by commas (can be used multiple times)
-config	Path to the INI configuration file
-d	Domain names separated by commas (can be used multiple times)
-demo	Censor output to make it suitable for demonstrations
-df	Path to a file providing root domain names
-dir	Path to the directory containing the graph database
-ef	Path to a file providing data sources to exclude
-exclude	Data source names separated by commas to be excluded
-if	Path to a file providing data sources to include
-include	Data source names separated by commas to be included
-ip	Show the IP addresses for discovered names
-ipv4	Show the IPv4 addresses for discovered names
-ipv6	Show the IPv6 addresses for discovered names
-list	Print the names of all available data sources
-log	Path to the log file where errors will be written
-max-dns-queries	Maximum number of concurrent DNS queries
-noresolvrate	Disable resolver rate monitoring
-noresolvscore	Disable resolver reliability scoring
-o	Path to the text output file
-org	Search string provided against AS description information
-p	Ports separated by commas (default: 443)
-public-dns	Use public-dns.info resolvers
-r	IP addresses of preferred DNS resolvers (can be used multiple times)
-rf	Path to a file providing preferred DNS resolvers
-src	Print data sources for the discovered names
-timeout	Number of minutes to execute the enumeration
-whois	All discovered domains are run through reverse whois

-active Enable active recon methods

-addr IPs and ranges (192.168.1.1-254) separated by commas

-asn ASNs separated by commas (can be used multiple times)

-cidr CIDRs separated by commas (can be used multiple times)

-config Path to the INI configuration file

-d Domain names separated by commas (can be used multiple times)

-demo Censor output to make it suitable for demonstrations

-df Path to a file providing root domain names

-dir Path to the directory containing the graph database

-ef Path to a file providing data sources to exclude

-exclude Data source names separated by commas to be excluded

-if Path to a file providing data sources to include

-include Data source names separated by commas to be included

-ip Show the IP addresses for discovered names

-ipv4 Show the IPv4 addresses for discovered names

-ipv6 Show the IPv6 addresses for discovered names

-list Print the names of all available data sources

-log Path to the log file where errors will be written

-max-dns-queries Maximum number of concurrent DNS queries

-noresolvrate Disable resolver rate monitoring

-noresolvscore Disable resolver reliability scoring

-o Path to the text output file

-org Search string provided against AS description information

-p Ports separated by commas (default: 443)

-public-dns Use public-dns.info resolvers

-r IP addresses of preferred DNS resolvers (can be used multiple times)

-rf Path to a file providing preferred DNS resolvers

-src Print data sources for the discovered names

-timeout Number of minutes to execute the enumeration

-whois All discovered domains are run through reverse whois

It has some visualization capabilities and can also output to other tools and in various formats such as D3.js, GEXF, Graphistry JSON, VisJS and Maltego format.

You can download Amass here:

Linux: amass_v3.4.2_linux_amd64.zip
Windows: amass_v3.4.2_windows_amd64.zip
Source: Amass-v3.4.2.zip

Or read more here.

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