T1489 - Service Stop

Description from ATT&CK

Adversaries may stop or disable services on a system to render those services unavailable to legitimate users. Stopping critical services or processes can inhibit or stop response to an incident or aid in the adversary's overall objectives to cause damage to the environment.(Citation: Talos Olympic Destroyer 2018)(Citation: Novetta Blockbuster) Adversaries may accomplish this by disabling individual services of high importance to an organization, such as MSExchangeIS, which will make Exchange content inaccessible (Citation: Novetta Blockbuster). In some cases, adversaries may stop or disable many or all services to render systems unusable.(Citation: Talos Olympic Destroyer 2018) Services or processes may not allow for modification of their data stores while running. Adversaries may stop services or processes in order to conduct [Data Destruction](https://attack.mitre.org/techniques/T1485) or [Data Encrypted for Impact](https://attack.mitre.org/techniques/T1486) on the data stores of services like Exchange and SQL Server.(Citation: SecureWorks WannaCry Analysis)

Atomic Tests

• Atomic Test #1 - Windows - Stop service using Service Controller

• Atomic Test #2 - Windows - Stop service using net.exe

• Atomic Test #3 - Windows - Stop service by killing process

• Atomic Test #4 - Linux - Stop service using systemctl

• Atomic Test #5 - Linux - Stop service by killing process using killall

• Atomic Test #6 - Linux - Stop service by killing process using kill

• Atomic Test #7 - Linux - Stop service by killing process using pkill

Atomic Test #1 - Windows - Stop service using Service Controller

Stops a specified service using the sc.exe command. Upon execution, if the spooler service was running infomration will be displayed saying it has changed to a state of STOP_PENDING. If the spooler service was not running “The service has not been started.” will be displayed and it can be started by running the cleanup command.

Supported Platforms: Windows

auto_generated_guid: 21dfb440-830d-4c86-a3e5-2a491d5a8d04

Inputs:

| Name | Description | Type | Default Value | |——|————-|——|—————| | service_name | Name of a service to stop | string | spooler|

Attack Commands: Run with

1	command_prompt

! Elevation Required (e.g. root or admin)

sc.exe stop #{service_name}

Cleanup Commands:

sc.exe start #{service_name} >nul 2>&1

Atomic Test #2 - Windows - Stop service using net.exe

Stops a specified service using the net.exe command. Upon execution, if the service was running “The Print Spooler service was stopped successfully.” will be displayed. If the service was not running, “The Print Spooler service is not started.” will be displayed and it can be started by running the cleanup command.

Supported Platforms: Windows

auto_generated_guid: 41274289-ec9c-4213-bea4-e43c4aa57954

Inputs:

| Name | Description | Type | Default Value | |——|————-|——|—————| | service_name | Name of a service to stop | string | spooler|

Attack Commands: Run with

1	command_prompt

! Elevation Required (e.g. root or admin)

net.exe stop #{service_name}

Cleanup Commands:

net.exe start #{service_name} >nul 2>&1

Atomic Test #3 - Windows - Stop service by killing process

Stops a specified service killng the service’s process. This technique was used by WannaCry. Upon execution, if the spoolsv service was running “SUCCESS: The process “spoolsv.exe” with PID 2316 has been terminated.” will be displayed. If the service was not running “ERROR: The process “spoolsv.exe” not found.” will be displayed and it can be started by running the cleanup command.

Supported Platforms: Windows

auto_generated_guid: f3191b84-c38b-400b-867e-3a217a27795f

Inputs:

| Name | Description | Type | Default Value | |——|————-|——|—————| | process_name | Name of a process to kill | string | spoolsv.exe|

Attack Commands: Run with

1	command_prompt

!

taskkill.exe /f /im #{process_name}

Atomic Test #4 - Linux - Stop service using systemctl

Stops a specified service using the systemctl command. Upon execution, if the specified service was running, it will change to a state of inactive and it can be restarted by running the cleanup command. You can list all available services with following command: “systemctl list-units –type=service”

Supported Platforms: Linux

auto_generated_guid: 42e3a5bd-1e45-427f-aa08-2a65fa29a820

Inputs:

| Name | Description | Type | Default Value | |——|————-|——|—————| | service_name | Name of a service to stop | string | cron|

Attack Commands: Run with

1

sh

! Elevation Required (e.g. root or admin)

1
sudo systemctl stop #{service_name}

Cleanup Commands:

1
sudo systemctl start #{service_name} 2> /dev/null

Atomic Test #5 - Linux - Stop service by killing process using killall

Stops a specified service by sending a SIGTERM signal to the linked process using the killall command. Upon execution, if the service’s main process was running, it will be terminated. If the service was not running, no process will be found to kill and it can be restarted by running the cleanup command. You can list all available services with following command: “systemctl list-units –type=service”

Supported Platforms: Linux

auto_generated_guid: e5d95be6-02ee-4ff1-aebe-cf86013b6189

Inputs:

| Name | Description | Type | Default Value | |——|————-|——|—————| | process_name | Name of a process to stop | string | cron| | service_name | Name of a service to restart | string | cron|

Attack Commands: Run with

1

sh

! Elevation Required (e.g. root or admin)

1
sudo killall -SIGTERM #{process_name}

Cleanup Commands:

1
sudo systemctl start #{service_name} 2> /dev/null

Atomic Test #6 - Linux - Stop service by killing process using kill

Stops a specified service by sending a SIGTERM signal to the linked process using the kill command. Upon execution, if the service’s main process was running, it will be terminated. If the service was not running, no process will be found to kill and it can be restarted by running the cleanup command. You can list all available services with following command: “systemctl list-units –type=service”

Supported Platforms: Linux

auto_generated_guid: 332f4c76-7e96-41a6-8cc2-7361c49db8be

Inputs:

| Name | Description | Type | Default Value | |——|————-|——|—————| | process_name | Name of a process to kill | string | cron| | service_name | Name of a service to restart | string | cron|

Attack Commands: Run with

1

sh

! Elevation Required (e.g. root or admin)

1
sudo kill -SIGTERM $(pgrep #{process_name})

Cleanup Commands:

1
sudo systemctl start #{service_name} 2> /dev/null

Atomic Test #7 - Linux - Stop service by killing process using pkill

Stops a specified service by sending a SIGTERM signal to the linked process using pkill. This method is effective when multiple instances of the process may be running. Upon execution, if any instances of the process were running, they will be terminated. If no instances were running, pkill will not find any processes to kill. Stopped service can be restarted by running the cleanup command. You can list all available services with following command: “systemctl list-units –type=service”

Supported Platforms: Linux

auto_generated_guid: 08b4718f-a8bf-4bb5-a552-294fc5178fea

Inputs:

| Name | Description | Type | Default Value | |——|————-|——|—————| | process_pattern | Pattern to match the name of the process to kill | string | ^cron$| | service_name | Name of a service to restart | string | cron|

Attack Commands: Run with

1

sh

! Elevation Required (e.g. root or admin)

1
sudo pkill -SIGTERM #{process_pattern}

Cleanup Commands:

1
sudo systemctl start #{service_name} 2> /dev/null