atomic-red-team/atomics/T1071/T1071.yaml

---
attack_technique: T1071
display_name: Standard Application Layer Protocol

atomic_tests:
- name: Malicious User Agents
  description: |
    This test simulates an infected host beaconing to command and control.
    Inspired by APTSimulator - https://github.com/NextronSystems/APTSimulator/blob/master/test-sets/command-and-control/malicious-user-agents.bat

  supported_platforms:
    - windows
  input_arguments:
    domain:
      description: Default domain to simulate against
      type: string
      default: www.google.com
  executor:
    name: powershell
    elevation_required: false
    command: |
      Invoke-WebRequest #{domain} -UserAgent "HttpBrowser/1.0" | out-null
      Invoke-WebRequest #{domain} -UserAgent "Wget/1.9+cvs-stable (Red Hat modified)" | out-null
      Invoke-WebRequest #{domain} -UserAgent "Opera/8.81 (Windows NT 6.0; U; en)" | out-null
      Invoke-WebRequest #{domain} -UserAgent "*<|>*" | out-null

- name: Malicious User Agents - Nix
  description: |
    This test simulates an infected host beaconing to command and control.
    Inspired by APTSimulator - https://github.com/NextronSystems/APTSimulator/blob/master/test-sets/command-and-control/malicious-user-agents.bat

  supported_platforms:
    - linux
    - macos
  input_arguments:
    domain:
      description: Default domain to simulate against
      type: string
      default: www.google.com
  executor:
    name: sh
    command: |
      curl -s -A "HttpBrowser/1.0" -m3 #{domain}
      curl -s -A "Wget/1.9+cvs-stable (Red Hat modified)" -m3 #{domain}
      curl -s -A "Opera/8.81 (Windows NT 6.0; U; en)" -m3 #{domain}
      curl -s -A "*<|>*" -m3 #{domain}

- name: DNS Large Query Volume
  description: |
    This test simulates an infected host sending a large volume of DNS queries to a command and control server.
    The intent of this test is to trigger threshold based detection on the number of DNS queries either from a single source system or to a single targe domain.

  supported_platforms:
    - windows
  input_arguments:
    domain:
      description: Default domain to simulate against
      type: string
      default: example.com
    subdomain:
      description: Subdomain prepended to the domain name
      type: string
      default: atomicredteam
    query_type:
      description: DNS query type
      type: string
      default: TXT
    query_volume:
      description: Number of DNS queries to send
      type: integer
      default: 1000
  executor:
    name: powershell
    elevation_required: false
    command: |
      for($i=0; $i -le #{query_volume}; $i++) { Resolve-DnsName -type "#{query_type}" "#{subdomain}.$(Get-Random -Minimum 1 -Maximum 999999).#{domain}" -QuickTimeout}

- name: DNS Regular Beaconing
  description: |
    This test simulates an infected host beaconing via DNS queries to a command and control server at regular intervals over time.
    This behaviour is typical of implants either in an idle state waiting for instructions or configured to use a low query volume over time to evade threshold based detection.

  supported_platforms:
    - windows
  input_arguments:
    domain:
      description: Default domain to simulate against
      type: string
      default: example.com
    subdomain:
      description: Subdomain prepended to the domain name
      type: string
      default: atomicredteam
    query_type:
      description: DNS query type
      type: string
      default: TXT
    c2_interval:
      description: Seconds between C2 requests to the command and control server
      type: integer
      default: 30
    c2_jitter:
      description: Percentage of jitter to add to the C2 interval to create variance in the times between C2 requests
      type: integer
      default: 20
    runtime:
      description: Time in minutes to run the simulation
      type: integer
      default: 30
  executor:
    name: powershell
    elevation_required: false
    command: |
      .\T1071-dns-beacon.ps1 -Domain #{domain} -Subdomain #{subdomain} -QueryType #{query_type} -C2Interval #{c2_interval} -C2Jitter #{c2_jitter} -RunTime #{runtime}
    
- name: DNS Long Domain Query
  description: |
    This test simulates an infected host returning data to a command and control server using long domain names.
    The simulation involves sending DNS queries that gradually increase in length until reaching the maximum length. The intent is to test the effectiveness of detection of DNS queries for long domain names over a set threshold.

  supported_platforms:
    - windows
  input_arguments:
    domain:
      description: Default domain to simulate against
      type: string
      default: example.com
    subdomain:
      description: Subdomain prepended to the domain name (should be 63 characters to test maximum length)
      type: string
      default: atomicredteamatomicredteamatomicredteamatomicredteamatomicredte
    query_type:
      description: DNS query type
      type: string
      default: TXT
  executor:
    name: powershell
    elevation_required: false
    command: |
      .\T1071-dns-domain-length.ps1 -Domain #{domain} -Subdomain #{subdomain} -QueryType #{query_type}