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Inter-Process Communication

Description from ATT&CK

Adversaries may abuse inter-process communication (IPC) mechanisms for local code or command execution. IPC is typically used by processes to share data, communicate with each other, or synchronize execution. IPC is also commonly used to avoid situations such as deadlocks, which occurs when processes are stuck in a cyclic waiting pattern.

Adversaries may abuse IPC to execute arbitrary code or commands. IPC mechanisms may differ depending on OS, but typically exists in a form accessible through programming languages/libraries or native interfaces such as Windows Dynamic Data Exchange or Component Object Model. Linux environments support several different IPC mechanisms, two of which being sockets and pipes.(Citation: Linux IPC) Higher level execution mediums, such as those of Command and Scripting Interpreters, may also leverage underlying IPC mechanisms. Adversaries may also use Remote Services such as Distributed Component Object Model to facilitate remote IPC execution.(Citation: Fireeye Hunting COM June 2019)

Atomic Tests

Atomic Test #1 - Cobalt Strike Artifact Kit pipe

Uses the Named Pipes Micro Emulation executable from the Center for Threat Informed Defense to create a named pipe for inter-process communication.

The named pipe executable will pause for 30 seconds to allow the client and server to exchange a message through the pipe.

Supported Platforms: windows

auto_generated_guid: bd13b9fc-b758-496a-b81a-397462f82c72

Inputs:

None

Attack Commands: Run with command_prompt!

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"PathToAtomicsFolder\..\ExternalPayloads\build\namedpipes_executor.exe" --pipe 1

Dependencies: Run with powershell!

Description: Named pipe executors must exist on disk

Check Prereq Commands:

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if ((Test-Path "PathToAtomicsFolder\..\ExternalPayloads\build\namedpipes_executor.exe") -and (Test-Path "PathToAtomicsFolder\..\ExternalPayloads\build\namedpipes_client.exe") -and (Test-Path "PathToAtomicsFolder\..\ExternalPayloads\build\namedpipes_server.exe")) {exit 0} else {exit 1}

Get Prereq Commands:

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New-Item -Type Directory "PathToAtomicsFolder\..\ExternalPayloads\" -ErrorAction ignore -Force | Out-Null
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
IEX (iwr "https://raw.githubusercontent.com/redcanaryco/invoke-atomicredteam/master/Public/Invoke-FetchFromZip.ps1" -UseBasicParsing)
$zipUrl  = "https://github.com/center-for-threat-informed-defense/adversary_emulation_library/raw/master/micro_emulation_plans/src/named_pipes/named_pipes.zip"
Invoke-FetchFromZip $zipUrl "*.exe" "PathToAtomicsFolder\..\ExternalPayloads"

Atomic Test #2 - Cobalt Strike Lateral Movement (psexec_psh) pipe

Uses the Named Pipes Micro Emulation executable from the Center for Threat Informed Defense to create a named pipe for inter-process communication.

The named pipe executable will pause for 30 seconds to allow the client and server to exchange a message through the pipe.

Supported Platforms: windows

auto_generated_guid: 830c8b6c-7a70-4f40-b975-8bbe74558acd

Inputs:

None

Attack Commands: Run with command_prompt!

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"PathToAtomicsFolder\..\ExternalPayloads\build\namedpipes_executor.exe" --pipe 2

Dependencies: Run with powershell!

Description: Named pipe executors must exist on disk

Check Prereq Commands:

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if ((Test-Path "PathToAtomicsFolder\..\ExternalPayloads\build\namedpipes_executor.exe") -and (Test-Path "PathToAtomicsFolder\..\ExternalPayloads\build\namedpipes_client.exe") -and (Test-Path "PathToAtomicsFolder\..\ExternalPayloads\build\namedpipes_server.exe")) {exit 0} else {exit 1}

Get Prereq Commands:

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New-Item -Type Directory "PathToAtomicsFolder\..\ExternalPayloads\" -ErrorAction ignore -Force | Out-Null
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
IEX (iwr "https://raw.githubusercontent.com/redcanaryco/invoke-atomicredteam/master/Public/Invoke-FetchFromZip.ps1" -UseBasicParsing)
$zipUrl  = "https://github.com/center-for-threat-informed-defense/adversary_emulation_library/raw/master/micro_emulation_plans/src/named_pipes/named_pipes.zip"
Invoke-FetchFromZip $zipUrl "*.exe" "PathToAtomicsFolder\..\ExternalPayloads"

Atomic Test #3 - Cobalt Strike SSH (postex_ssh) pipe

Uses the Named Pipes Micro Emulation executable from the Center for Threat Informed Defense to create a named pipe for inter-process communication.

The named pipe executable will pause for 30 seconds to allow the client and server to exchange a message through the pipe.

Supported Platforms: windows

auto_generated_guid: d1f72fa0-5bc2-4b4b-bd1e-43b6e8cfb2e6

Inputs:

None

Attack Commands: Run with command_prompt!

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"PathToAtomicsFolder\..\ExternalPayloads\build\namedpipes_executor.exe" --pipe 3

Dependencies: Run with powershell!

Description: Named pipe executors must exist on disk

Check Prereq Commands:

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if ((Test-Path "PathToAtomicsFolder\..\ExternalPayloads\build\namedpipes_executor.exe") -and (Test-Path "PathToAtomicsFolder\..\ExternalPayloads\build\namedpipes_client.exe") -and (Test-Path "PathToAtomicsFolder\..\ExternalPayloads\build\namedpipes_server.exe")) {exit 0} else {exit 1}

Get Prereq Commands:

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New-Item -Type Directory "PathToAtomicsFolder\..\ExternalPayloads\" -ErrorAction ignore -Force | Out-Null
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
IEX (iwr "https://raw.githubusercontent.com/redcanaryco/invoke-atomicredteam/master/Public/Invoke-FetchFromZip.ps1" -UseBasicParsing)
$zipUrl  = "https://github.com/center-for-threat-informed-defense/adversary_emulation_library/raw/master/micro_emulation_plans/src/named_pipes/named_pipes.zip"
Invoke-FetchFromZip $zipUrl "*.exe" "PathToAtomicsFolder\..\ExternalPayloads"

Atomic Test #4 - Cobalt Strike post-exploitation pipe (4.2 and later)

Uses the Named Pipes Micro Emulation executable from the Center for Threat Informed Defense to create a named pipe for inter-process communication.

The named pipe executable will pause for 30 seconds to allow the client and server to exchange a message through the pipe.

Supported Platforms: windows

auto_generated_guid: 7a48f482-246f-4aeb-9837-21c271ebf244

Inputs:

None

Attack Commands: Run with command_prompt!

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"PathToAtomicsFolder\..\ExternalPayloads\build\namedpipes_executor.exe" --pipe 4

Dependencies: Run with powershell!

Description: Named pipe executors must exist on disk

Check Prereq Commands:

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if ((Test-Path "PathToAtomicsFolder\..\ExternalPayloads\build\namedpipes_executor.exe") -and (Test-Path "PathToAtomicsFolder\..\ExternalPayloads\build\namedpipes_client.exe") -and (Test-Path "PathToAtomicsFolder\..\ExternalPayloads\build\namedpipes_server.exe")) {exit 0} else {exit 1}

Get Prereq Commands:

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New-Item -Type Directory "PathToAtomicsFolder\..\ExternalPayloads\" -ErrorAction ignore -Force | Out-Null
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
IEX (iwr "https://raw.githubusercontent.com/redcanaryco/invoke-atomicredteam/master/Public/Invoke-FetchFromZip.ps1" -UseBasicParsing)
$zipUrl  = "https://github.com/center-for-threat-informed-defense/adversary_emulation_library/raw/master/micro_emulation_plans/src/named_pipes/named_pipes.zip"
Invoke-FetchFromZip $zipUrl "*.exe" "PathToAtomicsFolder\..\ExternalPayloads"

Atomic Test #5 - Cobalt Strike post-exploitation pipe (before 4.2)

Uses the Named Pipes Micro Emulation executable from the Center for Threat Informed Defense to create a named pipe for inter-process communication.

The named pipe executable will pause for 30 seconds to allow the client and server to exchange a message through the pipe.

Supported Platforms: windows

auto_generated_guid: 8dbfc15c-527b-4ab0-a272-019f469d367f

Inputs:

None

Attack Commands: Run with command_prompt!

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"PathToAtomicsFolder\..\ExternalPayloads\build\namedpipes_executor.exe" --pipe 5

Dependencies: Run with powershell!

Description: Named pipe executors must exist on disk

Check Prereq Commands:

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if ((Test-Path "PathToAtomicsFolder\..\ExternalPayloads\build\namedpipes_executor.exe") -and (Test-Path "PathToAtomicsFolder\..\ExternalPayloads\build\namedpipes_client.exe") -and ("Test-Path PathToAtomicsFolder\..\ExternalPayloads\build\namedpipes_server.exe")) {exit 0} else {exit 1}

Get Prereq Commands:

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New-Item -Type Directory "PathToAtomicsFolder\..\ExternalPayloads\" -ErrorAction ignore -Force | Out-Null
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
IEX (iwr "https://raw.githubusercontent.com/redcanaryco/invoke-atomicredteam/master/Public/Invoke-FetchFromZip.ps1" -UseBasicParsing)
$zipUrl  = "https://github.com/center-for-threat-informed-defense/adversary_emulation_library/raw/master/micro_emulation_plans/src/named_pipes/named_pipes.zip"
Invoke-FetchFromZip $zipUrl "*.exe" "PathToAtomicsFolder\..\ExternalPayloads"

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