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Find sigma rule

Attack: Application Layer Protocol: DNS

Adversaries may communicate using the Domain Name System (DNS) application layer protocol to avoid detection/network filtering by blending in with existing traffic. Commands to the remote system, and often the results of those commands, will be embedded within the protocol traffic between the client and server.

The DNS protocol serves an administrative function in computer networking and thus may be very common in environments. DNS traffic may also be allowed even before network authentication is completed. DNS packets contain many fields and headers in which data can be concealed. Often known as DNS tunneling, adversaries may abuse DNS to communicate with systems under their control within a victim network while also mimicking normal, expected traffic.(Citation: PAN DNS Tunneling)(Citation: Medium DnsTunneling)

MITRE

Tactic

• command-and-control

technique

• T1071.004

Test : DNS C2

OS

• windows

Description:

This will attempt to start a C2 session using the DNS protocol. You will need to have a listener set up and create DNS records prior to executing this command. The following blogs have more information.

https://github.com/iagox86/dnscat2

https://github.com/lukebaggett/dnscat2-powershell

Executor

powershell

Sigma Rule

• proc_creation_win_powershell_download_patterns.yml (id: 3b6ab547-8ec2-4991-b9d2-2b06702a48d7)

• proc_creation_win_susp_web_request_cmd_and_cmdlets.yml (id: 9fc51a3c-81b3-4fa7-b35f-7c02cf10fd2d)

• posh_pm_susp_invocation_specific.yml (id: 8ff28fdd-e2fa-4dfa-aeda-ef3d61c62090)

• posh_pm_susp_download.yml (id: de41232e-12e8-49fa-86bc-c05c7e722df9)

• posh_ps_web_request_cmd_and_cmdlets.yml (id: 1139d2e2-84b1-4226-b445-354492eba8ba)

• posh_ps_susp_download.yml (id: 403c2cc0-7f6b-4925-9423-bfa573bed7eb)

• posh_ps_susp_invocation_specific.yml (id: ae7fbf8e-f3cb-49fd-8db4-5f3bed522c71)

• posh_ps_susp_keywords.yml (id: 1f49f2ab-26bc-48b3-96cc-dcffbc93eadf)

• file_event_win_csharp_compile_artefact.yml (id: e4a74e34-ecde-4aab-b2fb-9112dd01aed0)

• proc_creation_win_csc_susp_dynamic_compilation.yml (id: dcaa3f04-70c3-427a-80b4-b870d73c94c4)

• proc_creation_win_susp_shell_spawn_susp_program.yml (id: 3a6586ad-127a-4d3b-a677-1e6eacdf8fde)

• net_connection_win_powershell_network_connection.yml (id: 1f21ec3f-810d-4b0e-8045-322202e22b4b)

• net_connection_win_susp_file_sharing_domains_susp_folders.yml (id: e0f8ab85-0ac9-423b-a73a-81b3c7b1aa97)

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