gobuster

Gobuster

Gobuster is a tool used to brute-force:

  • URIs (directories and files) in web sites.
  • DNS subdomains (with wildcard support).
  • Virtual Host names on target web servers.
  • Open Amazon S3 buckets
  • Open Google Cloud buckets
  • TFTP servers

Tags, Statuses, etc

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Backers

All funds that are donated to this project will be donated to charity. A full log of charity donations will be available in this repository as they are processed.

Changes

3.6

  • Wordlist offset parameter to skip x lines from the wordlist
  • prevent double slashes when building up an url in dir mode
  • allow for multiple values and ranges on --exclude-length
  • no-fqdn parameter on dns bruteforce to disable the use of the systems search domains. This should speed up the run if you have configured some search domains. https://github.com/OJ/gobuster/pull/418

3.5

  • Allow Ranges in status code and status code blacklist. Example: 200,300-305,404

3.4

  • Enable TLS1.0 and TLS1.1 support
  • Add TFTP mode to search for files on tftp servers

3.3

  • Support TLS client certificates / mtls
  • support loading extensions from file
  • support fuzzing POST body, HTTP headers and basic auth
  • new option to not canonicalize header names

3.2

  • Use go 1.19
  • use contexts in the correct way
  • get rid of the wildcard flag (except in DNS mode)
  • color output
  • retry on timeout
  • google cloud bucket enumeration
  • fix nil reference errors

3.1

  • enumerate public AWS S3 buckets
  • fuzzing mode
  • specify HTTP method
  • added support for patterns. You can now specify a file containing patterns that are applied to every word, one by line. Every occurrence of the term {GOBUSTER} in it will be replaced with the current wordlist item. Please use with caution as this can cause increase the number of requests issued a lot.
  • The shorthand p flag which was assigned to proxy is now used by the pattern flag

3.0

  • New CLI options so modes are strictly separated (-m is now gone!)
  • Performance Optimizations and better connection handling
  • Ability to enumerate vhost names
  • Option to supply custom HTTP headers

License

See the LICENSE file.

Manual

Available Modes

  • dir - the classic directory brute-forcing mode
  • dns - DNS subdomain brute-forcing mode
  • s3 - Enumerate open S3 buckets and look for existence and bucket listings
  • gcs - Enumerate open google cloud buckets
  • vhost - virtual host brute-forcing mode (not the same as DNS!)
  • fuzz - some basic fuzzing, replaces the FUZZ keyword
  • tftp - bruteforce tftp files

Easy Installation

Binary Releases

We are now shipping binaries for each of the releases so that you don't even have to build them yourself! How wonderful is that!

If you're stupid enough to trust binaries that I've put together, you can download them from the releases page.

Docker

You can also grab a prebuilt docker image from https://github.com/OJ/gobuster/pkgs/container/gobuster

docker pull ghcr.io/oj/gobuster:latest

Using go install

If you have a Go environment ready to go (at least go 1.19), it's as easy as:

go install github.com/OJ/gobuster/v3@latest

PS: You need at least go 1.19 to compile gobuster.

Building From Source

Since this tool is written in Go you need to install the Go language/compiler/etc. Full details of installation and set up can be found on the Go language website. Once installed you have two options. You need at least go 1.19 to compile gobuster.

Compiling

gobuster has external dependencies, and so they need to be pulled in first:

go get && go build

This will create a gobuster binary for you. If you want to install it in the $GOPATH/bin folder you can run:

go install

Modes

Help is built-in!

  • gobuster help - outputs the top-level help.
  • gobuster help <mode> - outputs the help specific to that mode.

dns Mode

Options

Uses DNS subdomain enumeration mode

Usage:
  gobuster dns [flags]

Flags:
  -d, --domain string      The target domain
  -h, --help               help for dns
  -r, --resolver string    Use custom DNS server (format server.com or server.com:port)
  -c, --show-cname         Show CNAME records (cannot be used with '-i' option)
  -i, --show-ips           Show IP addresses
      --timeout duration   DNS resolver timeout (default 1s)
      --wildcard           Force continued operation when wildcard found

Global Flags:
      --delay duration    Time each thread waits between requests (e.g. 1500ms)
      --no-color          Disable color output
      --no-error          Don't display errors
  -z, --no-progress       Don't display progress
  -o, --output string     Output file to write results to (defaults to stdout)
  -p, --pattern string    File containing replacement patterns
  -q, --quiet             Don't print the banner and other noise
  -t, --threads int       Number of concurrent threads (default 10)
  -v, --verbose           Verbose output (errors)
  -w, --wordlist string   Path to the wordlist

Examples

gobuster dns -d mysite.com -t 50 -w common-names.txt

Normal sample run goes like this:

gobuster dns -d google.com -w ~/wordlists/subdomains.txt

===============================================================
Gobuster v3.2.0
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Mode         : dns
[+] Url/Domain   : google.com
[+] Threads      : 10
[+] Wordlist     : /home/oj/wordlists/subdomains.txt
===============================================================
2019/06/21 11:54:20 Starting gobuster
===============================================================
Found: chrome.google.com
Found: ns1.google.com
Found: admin.google.com
Found: www.google.com
Found: m.google.com
Found: support.google.com
Found: translate.google.com
Found: cse.google.com
Found: news.google.com
Found: music.google.com
Found: mail.google.com
Found: store.google.com
Found: mobile.google.com
Found: search.google.com
Found: wap.google.com
Found: directory.google.com
Found: local.google.com
Found: blog.google.com
===============================================================
2019/06/21 11:54:20 Finished
===============================================================

Show IP sample run goes like this:

gobuster dns -d google.com -w ~/wordlists/subdomains.txt -i

===============================================================
Gobuster v3.2.0
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Mode         : dns
[+] Url/Domain   : google.com
[+] Threads      : 10
[+] Wordlist     : /home/oj/wordlists/subdomains.txt
===============================================================
2019/06/21 11:54:54 Starting gobuster
===============================================================
Found: www.google.com [172.217.25.36, 2404:6800:4006:802::2004]
Found: admin.google.com [172.217.25.46, 2404:6800:4006:806::200e]
Found: store.google.com [172.217.167.78, 2404:6800:4006:802::200e]
Found: mobile.google.com [172.217.25.43, 2404:6800:4006:802::200b]
Found: ns1.google.com [216.239.32.10, 2001:4860:4802:32::a]
Found: m.google.com [172.217.25.43, 2404:6800:4006:802::200b]
Found: cse.google.com [172.217.25.46, 2404:6800:4006:80a::200e]
Found: chrome.google.com [172.217.25.46, 2404:6800:4006:802::200e]
Found: search.google.com [172.217.25.46, 2404:6800:4006:802::200e]
Found: local.google.com [172.217.25.46, 2404:6800:4006:80a::200e]
Found: news.google.com [172.217.25.46, 2404:6800:4006:802::200e]
Found: blog.google.com [216.58.199.73, 2404:6800:4006:806::2009]
Found: support.google.com [172.217.25.46, 2404:6800:4006:802::200e]
Found: wap.google.com [172.217.25.46, 2404:6800:4006:802::200e]
Found: directory.google.com [172.217.25.46, 2404:6800:4006:802::200e]
Found: translate.google.com [172.217.25.46, 2404:6800:4006:802::200e]
Found: music.google.com [172.217.25.46, 2404:6800:4006:802::200e]
Found: mail.google.com [172.217.25.37, 2404:6800:4006:802::2005]
===============================================================
2019/06/21 11:54:55 Finished
===============================================================

Base domain validation warning when the base domain fails to resolve. This is a warning rather than a failure in case the user fat-fingers while typing the domain.

gobuster dns -d yp.to -w ~/wordlists/subdomains.txt -i

===============================================================
Gobuster v3.2.0
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Mode         : dns
[+] Url/Domain   : yp.to
[+] Threads      : 10
[+] Wordlist     : /home/oj/wordlists/subdomains.txt
===============================================================
2019/06/21 11:56:43 Starting gobuster
===============================================================
2019/06/21 11:56:53 [-] Unable to validate base domain: yp.to
Found: cr.yp.to [131.193.32.108, 131.193.32.109]
===============================================================
2019/06/21 11:56:53 Finished
===============================================================

Wildcard DNS is also detected properly:

gobuster dns -d 0.0.1.xip.io -w ~/wordlists/subdomains.txt

===============================================================
Gobuster v3.2.0
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Mode         : dns
[+] Url/Domain   : 0.0.1.xip.io
[+] Threads      : 10
[+] Wordlist     : /home/oj/wordlists/subdomains.txt
===============================================================
2019/06/21 12:13:48 Starting gobuster
===============================================================
2019/06/21 12:13:48 [-] Wildcard DNS found. IP address(es): 1.0.0.0
2019/06/21 12:13:48 [!] To force processing of Wildcard DNS, specify the '--wildcard' switch.
===============================================================
2019/06/21 12:13:48 Finished
===============================================================

If the user wants to force processing of a domain that has wildcard entries, use --wildcard:

gobuster dns -d 0.0.1.xip.io -w ~/wordlists/subdomains.txt --wildcard

===============================================================
Gobuster v3.2.0
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Mode         : dns
[+] Url/Domain   : 0.0.1.xip.io
[+] Threads      : 10
[+] Wordlist     : /home/oj/wordlists/subdomains.txt
===============================================================
2019/06/21 12:13:51 Starting gobuster
===============================================================
2019/06/21 12:13:51 [-] Wildcard DNS found. IP address(es): 1.0.0.0
Found: 127.0.0.1.xip.io
Found: test.127.0.0.1.xip.io
===============================================================
2019/06/21 12:13:53 Finished
===============================================================

dir Mode

Options

Uses directory/file enumeration mode

Usage:
  gobuster dir [flags]

Flags:
  -f, --add-slash                       Append / to each request
  -c, --cookies string                  Cookies to use for the requests
  -d, --discover-backup                 Also search for backup files by appending multiple backup extensions
      --exclude-length ints             exclude the following content length (completely ignores the status). Supply multiple times to exclude multiple sizes.
  -e, --expanded                        Expanded mode, print full URLs
  -x, --extensions string               File extension(s) to search for
  -r, --follow-redirect                 Follow redirects
  -H, --headers stringArray             Specify HTTP headers, -H 'Header1: val1' -H 'Header2: val2'
  -h, --help                            help for dir
      --hide-length                     Hide the length of the body in the output
  -m, --method string                   Use the following HTTP method (default "GET")
  -n, --no-status                       Don't print status codes
  -k, --no-tls-validation               Skip TLS certificate verification
  -P, --password string                 Password for Basic Auth
      --proxy string                    Proxy to use for requests [http(s)://host:port]
      --random-agent                    Use a random User-Agent string
      --retry                           Should retry on request timeout
      --retry-attempts int              Times to retry on request timeout (default 3)
  -s, --status-codes string             Positive status codes (will be overwritten with status-codes-blacklist if set)
  -b, --status-codes-blacklist string   Negative status codes (will override status-codes if set) (default "404")
      --timeout duration                HTTP Timeout (default 10s)
  -u, --url string                      The target URL
  -a, --useragent string                Set the User-Agent string (default "gobuster/3.2.0")
  -U, --username string                 Username for Basic Auth

Global Flags:
      --delay duration    Time each thread waits between requests (e.g. 1500ms)
      --no-color          Disable color output
      --no-error          Don't display errors
  -z, --no-progress       Don't display progress
  -o, --output string     Output file to write results to (defaults to stdout)
  -p, --pattern string    File containing replacement patterns
  -q, --quiet             Don't print the banner and other noise
  -t, --threads int       Number of concurrent threads (default 10)
  -v, --verbose           Verbose output (errors)
  -w, --wordlist string   Path to the wordlist

Examples

gobuster dir -u https://mysite.com/path/to/folder -c 'session=123456' -t 50 -w common-files.txt -x .php,.html

Default options looks like this:

gobuster dir -u https://buffered.io -w ~/wordlists/shortlist.txt

===============================================================
Gobuster v3.2.0
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Mode         : dir
[+] Url/Domain   : https://buffered.io/
[+] Threads      : 10
[+] Wordlist     : /home/oj/wordlists/shortlist.txt
[+] Status codes : 200,204,301,302,307,401,403
[+] User Agent   : gobuster/3.2.0
[+] Timeout      : 10s
===============================================================
2019/06/21 11:49:43 Starting gobuster
===============================================================
/categories (Status: 301)
/contact (Status: 301)
/posts (Status: 301)
/index (Status: 200)
===============================================================
2019/06/21 11:49:44 Finished
===============================================================

Default options with status codes disabled looks like this:

gobuster dir -u https://buffered.io -w ~/wordlists/shortlist.txt -n

===============================================================
Gobuster v3.2.0
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Mode         : dir
[+] Url/Domain   : https://buffered.io/
[+] Threads      : 10
[+] Wordlist     : /home/oj/wordlists/shortlist.txt
[+] Status codes : 200,204,301,302,307,401,403
[+] User Agent   : gobuster/3.2.0
[+] No status    : true
[+] Timeout      : 10s
===============================================================
2019/06/21 11:50:18 Starting gobuster
===============================================================
/categories
/contact
/index
/posts
===============================================================
2019/06/21 11:50:18 Finished
===============================================================

Verbose output looks like this:

gobuster dir -u https://buffered.io -w ~/wordlists/shortlist.txt -v

===============================================================
Gobuster v3.2.0
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Mode         : dir
[+] Url/Domain   : https://buffered.io/
[+] Threads      : 10
[+] Wordlist     : /home/oj/wordlists/shortlist.txt
[+] Status codes : 200,204,301,302,307,401,403
[+] User Agent   : gobuster/3.2.0
[+] Verbose      : true
[+] Timeout      : 10s
===============================================================
2019/06/21 11:50:51 Starting gobuster
===============================================================
Missed: /alsodoesnotexist (Status: 404)
Found: /index (Status: 200)
Missed: /doesnotexist (Status: 404)
Found: /categories (Status: 301)
Found: /posts (Status: 301)
Found: /contact (Status: 301)
===============================================================
2019/06/21 11:50:51 Finished
===============================================================

Example showing content length:

gobuster dir -u https://buffered.io -w ~/wordlists/shortlist.txt -l

===============================================================
Gobuster v3.2.0
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Mode         : dir
[+] Url/Domain   : https://buffered.io/
[+] Threads      : 10
[+] Wordlist     : /home/oj/wordlists/shortlist.txt
[+] Status codes : 200,204,301,302,307,401,403
[+] User Agent   : gobuster/3.2.0
[+] Show length  : true
[+] Timeout      : 10s
===============================================================
2019/06/21 11:51:16 Starting gobuster
===============================================================
/categories (Status: 301) [Size: 178]
/posts (Status: 301) [Size: 178]
/contact (Status: 301) [Size: 178]
/index (Status: 200) [Size: 51759]
===============================================================
2019/06/21 11:51:17 Finished
===============================================================

Quiet output, with status disabled and expanded mode looks like this ("grep mode"):

gobuster dir -u https://buffered.io -w ~/wordlists/shortlist.txt -q -n -e
https://buffered.io/index
https://buffered.io/contact
https://buffered.io/posts
https://buffered.io/categories

vhost Mode

Options

Uses VHOST enumeration mode (you most probably want to use the IP address as the URL parameter)

Usage:
  gobuster vhost [flags]

Flags:
      --append-domain         Append main domain from URL to words from wordlist. Otherwise the fully qualified domains need to be specified in the wordlist.
  -c, --cookies string        Cookies to use for the requests
      --domain string         the domain to append when using an IP address as URL. If left empty and you specify a domain based URL the hostname from the URL is extracted
      --exclude-length ints   exclude the following content length (completely ignores the status). Supply multiple times to exclude multiple sizes.
  -r, --follow-redirect       Follow redirects
  -H, --headers stringArray   Specify HTTP headers, -H 'Header1: val1' -H 'Header2: val2'
  -h, --help                  help for vhost
  -m, --method string         Use the following HTTP method (default "GET")
  -k, --no-tls-validation     Skip TLS certificate verification
  -P, --password string       Password for Basic Auth
      --proxy string          Proxy to use for requests [http(s)://host:port]
      --random-agent          Use a random User-Agent string
      --retry                 Should retry on request timeout
      --retry-attempts int    Times to retry on request timeout (default 3)
      --timeout duration      HTTP Timeout (default 10s)
  -u, --url string            The target URL
  -a, --useragent string      Set the User-Agent string (default "gobuster/3.2.0")
  -U, --username string       Username for Basic Auth

Global Flags:
      --delay duration    Time each thread waits between requests (e.g. 1500ms)
      --no-color          Disable color output
      --no-error          Don't display errors
  -z, --no-progress       Don't display progress
  -o, --output string     Output file to write results to (defaults to stdout)
  -p, --pattern string    File containing replacement patterns
  -q, --quiet             Don't print the banner and other noise
  -t, --threads int       Number of concurrent threads (default 10)
  -v, --verbose           Verbose output (errors)
  -w, --wordlist string   Path to the wordlist

Examples

gobuster vhost -u https://mysite.com -w common-vhosts.txt

Normal sample run goes like this:

gobuster vhost -u https://mysite.com -w common-vhosts.txt

===============================================================
Gobuster v3.2.0
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Url:          https://mysite.com
[+] Threads:      10
[+] Wordlist:     common-vhosts.txt
[+] User Agent:   gobuster/3.2.0
[+] Timeout:      10s
===============================================================
2019/06/21 08:36:00 Starting gobuster
===============================================================
Found: www.mysite.com
Found: piwik.mysite.com
Found: mail.mysite.com
===============================================================
2019/06/21 08:36:05 Finished
===============================================================

fuzz Mode

Options

Uses fuzzing mode

Usage:
  gobuster fuzz [flags]

Flags:
  -c, --cookies string              Cookies to use for the requests
      --exclude-length ints         exclude the following content length (completely ignores the status). Supply multiple times to exclude multiple sizes.
  -b, --excludestatuscodes string   Negative status codes (will override statuscodes if set)
  -r, --follow-redirect             Follow redirects
  -H, --headers stringArray         Specify HTTP headers, -H 'Header1: val1' -H 'Header2: val2'
  -h, --help                        help for fuzz
  -m, --method string               Use the following HTTP method (default "GET")
  -k, --no-tls-validation           Skip TLS certificate verification
  -P, --password string             Password for Basic Auth
      --proxy string                Proxy to use for requests [http(s)://host:port]
      --random-agent                Use a random User-Agent string
      --retry                       Should retry on request timeout
      --retry-attempts int          Times to retry on request timeout (default 3)
      --timeout duration            HTTP Timeout (default 10s)
  -u, --url string                  The target URL
  -a, --useragent string            Set the User-Agent string (default "gobuster/3.2.0")
  -U, --username string             Username for Basic Auth

Global Flags:
      --delay duration    Time each thread waits between requests (e.g. 1500ms)
      --no-color          Disable color output
      --no-error          Don't display errors
  -z, --no-progress       Don't display progress
  -o, --output string     Output file to write results to (defaults to stdout)
  -p, --pattern string    File containing replacement patterns
  -q, --quiet             Don't print the banner and other noise
  -t, --threads int       Number of concurrent threads (default 10)
  -v, --verbose           Verbose output (errors)
  -w, --wordlist string   Path to the wordlist

Examples

gobuster fuzz -u https://example.com?FUZZ=test -w parameter-names.txt

s3 Mode

Options

Uses aws bucket enumeration mode

Usage:
  gobuster s3 [flags]

Flags:
  -h, --help                 help for s3
  -m, --maxfiles int         max files to list when listing buckets (only shown in verbose mode) (default 5)
  -k, --no-tls-validation    Skip TLS certificate verification
      --proxy string         Proxy to use for requests [http(s)://host:port]
      --random-agent         Use a random User-Agent string
      --retry                Should retry on request timeout
      --retry-attempts int   Times to retry on request timeout (default 3)
      --timeout duration     HTTP Timeout (default 10s)
  -a, --useragent string     Set the User-Agent string (default "gobuster/3.2.0")

Global Flags:
      --delay duration    Time each thread waits between requests (e.g. 1500ms)
      --no-color          Disable color output
      --no-error          Don't display errors
  -z, --no-progress       Don't display progress
  -o, --output string     Output file to write results to (defaults to stdout)
  -p, --pattern string    File containing replacement patterns
  -q, --quiet             Don't print the banner and other noise
  -t, --threads int       Number of concurrent threads (default 10)
  -v, --verbose           Verbose output (errors)
  -w, --wordlist string   Path to the wordlist

Examples

gobuster s3 -w bucket-names.txt

gcs Mode

Options

Uses gcs bucket enumeration mode

Usage:
  gobuster gcs [flags]

Flags:
  -h, --help                 help for gcs
  -m, --maxfiles int         max files to list when listing buckets (only shown in verbose mode) (default 5)
  -k, --no-tls-validation    Skip TLS certificate verification
      --proxy string         Proxy to use for requests [http(s)://host:port]
      --random-agent         Use a random User-Agent string
      --retry                Should retry on request timeout
      --retry-attempts int   Times to retry on request timeout (default 3)
      --timeout duration     HTTP Timeout (default 10s)
  -a, --useragent string     Set the User-Agent string (default "gobuster/3.2.0")

Global Flags:
      --delay duration    Time each thread waits between requests (e.g. 1500ms)
      --no-color          Disable color output
      --no-error          Don't display errors
  -z, --no-progress       Don't display progress
  -o, --output string     Output file to write results to (defaults to stdout)
  -p, --pattern string    File containing replacement patterns
  -q, --quiet             Don't print the banner and other noise
  -t, --threads int       Number of concurrent threads (default 10)
  -v, --verbose           Verbose output (errors)
  -w, --wordlist string   Path to the wordlist

Examples

gobuster gcs -w bucket-names.txt

tftp Mode

Options

Uses TFTP enumeration mode

Usage:
  gobuster tftp [flags]

Flags:
  -h, --help               help for tftp
  -s, --server string      The target TFTP server
      --timeout duration   TFTP timeout (default 1s)

Global Flags:
      --delay duration    Time each thread waits between requests (e.g. 1500ms)
      --no-color          Disable color output
      --no-error          Don't display errors
  -z, --no-progress       Don't display progress
  -o, --output string     Output file to write results to (defaults to stdout)
  -p, --pattern string    File containing replacement patterns
  -q, --quiet             Don't print the banner and other noise
  -t, --threads int       Number of concurrent threads (default 10)
  -v, --verbose           Verbose output (errors)
  -w, --wordlist string   Path to the wordlist

Examples

gobuster tftp -s tftp.example.com -w common-filenames.txt

Wordlists via STDIN

Wordlists can be piped into gobuster via stdin by providing a - to the -w option:

hashcat -a 3 --stdout ?l | gobuster dir -u https://mysite.com -w -

Note: If the -w option is specified at the same time as piping from STDIN, an error will be shown and the program will terminate.

Patterns

You can supply pattern files that will be applied to every word from the wordlist. Just place the string {GOBUSTER} in it and this will be replaced with the word. This feature is also handy in s3 mode to pre- or postfix certain patterns.

Caution: Using a big pattern file can cause a lot of request as every pattern is applied to every word in the wordlist.

Example file

{GOBUSTER}Partial
{GOBUSTER}Service
PRE{GOBUSTER}POST
{GOBUSTER}-prod
{GOBUSTER}-dev

Use case in combination with patterns

  • Create a custom wordlist for the target containing company names and so on
  • Create a pattern file to use for common bucket names.
curl -s --output - https://raw.githubusercontent.com/eth0izzle/bucket-stream/master/permutations/extended.txt | sed -s 's/%s/{GOBUSTER}/' > patterns.txt
  • Run gobuster with the custom input. Be sure to turn verbose mode on to see the bucket details
gobuster s3 --wordlist my.custom.wordlist -p patterns.txt -v

Normal sample run goes like this:

PS C:\Users\firefart\Documents\code\gobuster> .\gobuster.exe s3 --wordlist .\wordlist.txt
===============================================================
Gobuster v3.2.0
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Threads:                 10
[+] Wordlist:                .\wordlist.txt
[+] User Agent:              gobuster/3.2.0
[+] Timeout:                 10s
[+] Maximum files to list:   5
===============================================================
2019/08/12 21:48:16 Starting gobuster in S3 bucket enumeration mode
===============================================================
webmail
hacking
css
img
www
dav
web
localhost
===============================================================
2019/08/12 21:48:17 Finished
===============================================================

Verbose and sample run

PS C:\Users\firefart\Documents\code\gobuster> .\gobuster.exe s3 --wordlist .\wordlist.txt -v
===============================================================
Gobuster v3.2.0
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Threads:                 10
[+] Wordlist:                .\wordlist.txt
[+] User Agent:              gobuster/3.2.0
[+] Verbose:                 true
[+] Timeout:                 10s
[+] Maximum files to list:   5
===============================================================
2019/08/12 21:49:00 Starting gobuster in S3 bucket enumeration mode
===============================================================
www [Error: All access to this object has been disabled (AllAccessDisabled)]
hacking [Error: Access Denied (AccessDenied)]
css [Error: All access to this object has been disabled (AllAccessDisabled)]
webmail [Error: All access to this object has been disabled (AllAccessDisabled)]
img [Bucket Listing enabled: GodBlessPotomac1.jpg (1236807b), HOMEWORKOUTAUDIO.zip (203908818b), ProductionInfo.xml (11946b), Start of Perpetual Motion Logo-1.mp3 (621821b), addressbook.gif (3115b)]
web [Error: Access Denied (AccessDenied)]
dav [Error: All access to this object has been disabled (AllAccessDisabled)]
localhost [Error: Access Denied (AccessDenied)]
===============================================================
2019/08/12 21:49:01 Finished
===============================================================

Extended sample run

PS C:\Users\firefart\Documents\code\gobuster> .\gobuster.exe s3 --wordlist .\wordlist.txt -e
===============================================================
Gobuster v3.2.0
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Threads:                 10
[+] Wordlist:                .\wordlist.txt
[+] User Agent:              gobuster/3.2.0
[+] Timeout:                 10s
[+] Expanded:                true
[+] Maximum files to list:   5
===============================================================
2019/08/12 21:48:38 Starting gobuster in S3 bucket enumeration mode
===============================================================
http://css.s3.amazonaws.com/
http://www.s3.amazonaws.com/
http://webmail.s3.amazonaws.com/
http://hacking.s3.amazonaws.com/
http://img.s3.amazonaws.com/
http://web.s3.amazonaws.com/
http://dav.s3.amazonaws.com/
http://localhost.s3.amazonaws.com/
===============================================================
2019/08/12 21:48:38 Finished
===============================================================