makyotox/amass

In-depth subdomain enumeration written in Go

Amass

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Amass is the subdomain enumeration tool with the greatest number of disparate data sources that performs analysis of the resolved names in order to deliver the largest number of quality results.

Amass performs scraping of data sources, recursive brute forcing, crawling of web archives, permuting and altering of names, reverse DNS sweeping, and machine learning to obtain additional subdomain names. The architecture makes it easy to add new subdomain enumeration techniques as they are developed.

DNS name resolution is performed across many public servers so the authoritative server will see traffic coming from different locations.

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How to Install

Prebuilt

A precompiled version is available for each release.

If your operating environment supports Snap, you can click here to install, or perform the following from the command-line:

$ sudo snap install amass

If you would like snap to get you the latest unstable build of amass, type the following command:

$ sudo snap install --edge amass

From Source

If you would prefer to build your own binary from the latest version of the source code, make sure you have a correctly configured Go >= 1.10 environment. More information about how to achieve this can be found on the golang website. Then, take the following steps:

1. Download amass:

$ go get -u github.com/caffix/amass

At this point, the amass binary should be in $GOPATH/bin.

2. Several wordlists can be found in the following directory:

$ ls $GOPATH/src/github.com/caffix/amass/wordlists/

Using the Tool

The most basic use of the tool, which includes reverse DNS lookups and name alterations:

$ amass -d example.com

Add some additional domains to the enumeration:

$ amass -d example1.com,example2.com -d example3.com

You can also provide the initial domain names via an input file:

$ amass -df domains.txt

Get amass to provide the sources that discovered the subdomain names and print summary information:

$ amass -v -d example.com
[Google] www.example.com
[VirusTotal] ns.example.com
...
13242 names discovered - scrape: 211, dns: 4709, archive: 126, brute: 169, alt: 8027

Have amass print IP addresses with the discovered names:

$ amass -ip -d example.com

Have amass write the results to a text file:

$ amass -ip -o out.txt -d example.com

Have all the data collected written to a file as individual JSON objects:

$ amass -json out.txt -d example.com

Specify your own DNS resolvers on the command-line or from a file:

$ amass -v -d example.com -r 8.8.8.8,1.1.1.1

The resolvers file can be provided using the following command-line switch:

$ amass -v -d example.com -rf data/resolvers.txt

If you would like to blacklist some subdomains:

$ amass -bl blah.example.com -d example.com

The blacklisted subdomains can be specified from a text file as well:

$ amass -blf data/blacklist.txt -d example.com

The amass feature that performs alterations on discovered names and attempt resolution can be disabled:

$ amass -noalts -d example.com

Use active information gathering techniques to attempt DNS zone transfers on all discovered authoritative name servers and obtain TLS/SSL certificates for discovered hosts on all specified ports:

$ amass -active -d example.com net -p 80,443,8080

Caution, this is an active technique that will reveal your IP address to the target organization.

Have amass perform brute force subdomain enumeration as well:

$ amass -brute -d example.com

By default, amass performs recursive brute forcing on new subdomains; this can be disabled:

$ amass -brute -norecursive -d example.com

If you would like to perform recursive brute forcing after enough discoveries have been made:

$ amass -brute -min-for-recursive 3 -d example.com

Change the wordlist used during the brute forcing phase of the enumeration:

$ amass -brute -w wordlist.txt -d example.com

Throttle the rate of DNS queries by number per minute:

$ amass -freq 120 -d example.com

Allow amass to include additional domains in the search using reverse whois information:

$ amass -whois -d example.com

You can have amass list all the domains discovered with reverse whois before performing the enumeration:

$ amass -whois -l -d example.com

Only the first domain provided is used while performing the reverse whois operation.

Network/Infrastructure Options

Caution: If you use these options without specifying root domain names, amass will attempt to reach out to every IP address within the identified infrastructure and obtain names from TLS certificates. This is "loud" and can reveal your reconnaissance activities to the organization being investigated.

If you do provide root domain names on the command-line, these options will simply serve as constraints to the amass output.

All the flags shown here require the 'net' subcommand to be specified first.

To discover all domains hosted within target ASNs, use the following option:

$ amass net -asn 13374,14618

To investigate within target CIDRs, use this option:

$ amass net -cidr 192.184.113.0/24,104.154.0.0/15

To limit your enumeration to specific IPs or address ranges, use this option:

$ amass net -addr 192.168.1.44,192.168.2.1-64

By default, port 443 will be checked for certificates, but the ports can be changed as follows:

$ amass net -cidr 192.168.1.0/24 -p 80,443,8080

Using a Proxy (still under development)

The amass tool can send all its traffic through a proxy, such as socks4, socks4a, socks5, http and https. Do not use this to send the traffic through Tor, since that network does not support UDP traffic.

$ amass -v -proxy socks5://user:[email protected]:5050 example.com

Thank you GameXG/ProxyClient for making it easy to implement this feature!

Integrating Amass into Your Work

If you are using the amass package within your own Go code, be sure to properly seed the default pseudo-random number generator:

import(
    "fmt"
    "math/rand"
    "time"

    "github.com/caffix/amass/amass"
)

func main() {
    output := make(chan *amass.AmassRequest)

    go func() {
        for result := range output {
            fmt.Println(result.Name)
        }
    }()

    // Seed the default pseudo-random number generator
    rand.Seed(time.Now().UTC().UnixNano())

    // Setup the most basic amass configuration
    config := amass.CustomConfig(&amass.AmassConfig{Output: output})
    config.AddDomains([]string{"example.com"})

    // Begin the enumeration process
    amass.StartEnumeration(config)
}

Settings for the Amass Maltego Local Transform

1. Setup a new local transform within Maltego:

2. Configure the local transform to properly execute the go program:

3. Go into the Transform Manager, and disable the debug info option:

Community

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Let Me Know What You Think

NOTE: Still under development

Author: Jeff Foley @jeff_foley

Company: ClaritySec, Inc. / @claritysecinc