Live Response API Reference

As of January 2020, CB Response is now called Carbon Black EDR. All documentation will be updated in the coming months to reflect our new product names.

The CB Response Live Response feature allows security operators to collect information and take action on remote endpoints in real time. These actions include the ability to upload, download, and remove files, retrieve and remove registry entries, dump contents of physical memory, execute and terminate processes.

The Live Response API is a subset of the broader CB Response REST APIs.
Authentication uses the same AuthToken Header as the CB Response REST API.

The Live Response API is asynchronous; calling an API to execute a command on the remote endpoint, for example, will return immediately with a command ID. You can then poll the API using the command ID until a result status is returned.

Before any commands can be sent to an endpoint, you must first establish a “session” with a sensor. A sensor with an active session will keep an open connection to the Carbon Black server for as long as the session is active. Sessions are kept alive for a timeout period and then recycled once the timeout period has expired. All Live Response command APIs require a valid session id; an error is returned if the session has not been established or has timed out.

Note: To use the Live Response API, you must enable Live Response in your CB Response server by editing the /etc/cb/cb.conf file by setting CbLREnabled=True. Live Response is disabled by default. If you attempt to use the Live Response API without first enabling it in the cb.conf file and restarting the cb-enterprise services, you will receive an HTTP 412 error code. For cloud instances, please contact support to have it enabled.

Examples

View Current Sessions

To view all current sessions, use a GET command to https://<hostname>/api/v1/cblr/session. The following request will retrieve a list of currently active or recently closed sessions. Note: If you just created a session, it might show up as status: pending, this will transition to status: active once the session is ready.

Request

$ curl -H "Content-Type: application/json" -H "X-Auth-Token: d91b00774b2b903b49d8d9caa57ce9fcde16973a" \ http://127.0.0.1/api/v1/cblr/session

Response

[
    {
        "status": "close",
        "sensor_id": 1,
        "supported_commands": [
            "delete file",
            "put file",
            "directory list",
            "get file",
            "kill",
            "create process",
            "process list",
            "create directory"
        ],
        "drives": [],
        "storage_size": "46636",
        "create_time": 1531841454.61905,
        "sensor_wait_timeout": 120,
        "address": "144.121.3.50",
        "check_in_timeout": 1200,
        "id": 2,
        "close_time": 1531845314.237512,
        "hostname": "devr-test",
        "storage_ttl": 7,
        "os_version": "",
        "session_timeout": 300,
        "current_working_directory": "/opt/cbsensor"
    },
    {
        "status": "pending",
        "sensor_id": 1,
        "supported_commands": [],
        "drives": [],
        "storage_size": 0,
        "create_time": 1531849564.118052,
        "sensor_wait_timeout": 120,
        "address": null,
        "check_in_timeout": 1200,
        "id": 3,
        "hostname": "devr-test",
        "storage_ttl": 7,
        "os_version": "",
        "session_timeout": 300,
        "current_working_directory": ""
    },
    {
        "status": "active",
        "sensor_id": 2,
        "supported_commands": [
            "delete file",
            "put file",
            "directory list",
            "get file",
            "kill",
            "create process",
            "process list",
            "create directory"
        ],
        "drives": [],
        "storage_size": "46858",
        "create_time": 1531849564.118052,
        "sensor_wait_timeout": 120,
        "address": "144.121.3.50",
        "check_in_timeout": 1200,
        "id": 3,
        "hostname": "devr-test",
        "storage_ttl": 7,
        "os_version": "",
        "session_timeout": 300,
        "current_working_directory": "/opt/cbsensor"
    }
]

Parameters

New to CB Response 6.3

To view all active CB live response sessions, use a GET command with the parameter ?active_only=true to https://<hostname>/api/v1/cblr/session. The following request will retrieve a list of currently active sessions. This feature was added to reduce the size of the response when there are a large number of closed sessions. Note: If you just created a session, it might show up as status: pending, this will transition to status: active once the session is ready.

If you don’t use a parameter, or use set active_only=false, it will default to View Current Sessions

Request

$ curl -H "Content-Type: application/json" -H "X-Auth-Token: d91b00774b2b903b49d8d9caa57ce9fcde16973a" \ http://127.0.0.1/api/v1/cblr/session?active_only=true

Response

[
    {
        "status": "active",
        "sensor_id": 2,
        "supported_commands": [
            "delete file",
            "put file",
            "directory list",
            "get file",
            "kill",
            "create process",
            "process list",
            "create directory"
        ],
        "drives": [],
        "storage_size": "46858",
        "create_time": 1531849564.118052,
        "sensor_wait_timeout": 120,
        "address": "144.121.3.50",
        "check_in_timeout": 1200,
        "id": 3,
        "hostname": "devr-test",
        "storage_ttl": 7,
        "os_version": "",
        "session_timeout": 300,
        "current_working_directory": "/opt/cbsensor"
    }
]

Start a New Session

All CBLR activity requires you first start a session with a sensor by POSTing to /api/v1/cblr/session with requested sensor_id. Note: a live response session can be created from the CbR UI as well.

Request

$ curl -H "Content-Type: application/json" -H "X-Auth-Token: d91b00774b2b903b49d8d9caa57ce9fcde16973a" \ -d '{"sensor_id": 10}' http://127.0.0.1/api/v1/cblr/session

Response

{
    "status": "pending",
    "sensor_id": 10,
    "supported_commands": [],
    "drives": [],
    "storage_size": 0,
    "create_time": 1418247933.634789,
    "sensor_wait_timeout": 120,
    "address": null,
    "check_in_timeout": 1200,
    "id": 2,
    "hostname": "WIN-EP7RMLTCLAJ",
    "storage_ttl": 7,
    "os_version": "",
    "session_timeout": 300,
    "current_working_directory": ""
}

Note status is pending and the session id is 2. Wait a few seconds, then GET status of session 2:

Request

$ curl -H "Content-Type: application/json" -H "X-Auth-Token: d91b00774b2b903b49d8d9caa57ce9fcde16973a" \
http://127.0.0.1/api/v1/cblr/session/2

Response

{
    "status": "active",
    "sensor_id": 10,
    "supported_commands": [
        "delete file",
        "put file",
        "reg delete key",
        "directory list",
        "reg create key",
        "get file",
        "reg enum key",
        "reg query value",
        "kill",
        "create process",
        "process list",
        "reg delete value",
        "reg set value",
        "create directory"
    ],
    "drives": ["A:\\", "C:\\", "D:\\"],
    "storage_size": 0,
    "create_time": 1418247933.634789,
    "sensor_wait_timeout": 120,
    "address": "::ffff:192.168.206.128",
    "check_in_timeout": 1200,
    "id": 2,
    "hostname": "WIN-EP7RMLTCLAJ",
    "storage_ttl": 7,
    "os_version": "",
    "session_timeout": 300,
    "current_working_directory": "C:\\Windows\\CarbonBlack"
}

Note status is active and session object now has context from the endpoint - supported_commands, current_working_directory, etc.

Issue Commands

Once a session is active, you can create commands by POSTing a command object to the session via /api/v1/cblr/session/2/command. For example, to get a process list:

Request

$ curl -H "Content-Type: application/json" -H "X-Auth-Token: d91b00774b2b903b49d8d9caa57ce9fcde16973a" \ -d '{"session_id": 2, "name": "process list"}' http://127.0.0.1/api/v1/cblr/session/2/command

Response

{
    "status": "pending",
    "username": "admin",
    "sensor_id": 10,
    "create_time": 1418248098.5540111,
    "name": "process list",
    "object": null,
    "id": 1,
    "session_id": 2
}

Note status is pending and command id is 1. Wait a few seconds, then GET status of command 1 in session 2:

Request

$ curl -H "Content-Type: application/json" -H "X-Auth-Token: d91b00774b2b903b49d8d9caa57ce9fcde16973a" \ http://127.0.0.1/api/v1/cblr/session/2/command/1

Response

{
    "status": "complete",
    "username": "admin",
    "sensor_id": 10,
    "object": null,
    "create_time": 1418248098.5540111,
    "id": 1,
    "completion": 1418248098.5710759,
    "processes": [
        {
            "username": "NT AUTHORITY\\SYSTEM",
            "create_time": 1418247141,
            "parent_guid": "0000000a-0000-0000-0000-000000000000",
            "parent": 0,
            "sid": "s-1-5-18",
            "path": "",
            "command_line": "",
            "pid": 4,
            "proc_guid": "0000000a-0000-0004-01d0-14c0c80ce18b"
        },
        {
            "username": "NT AUTHORITY\\SYSTEM",
            "create_time": 1418247141,
            "parent_guid": "0000000a-0000-0004-01d0-14c0c80ce18b",
            "parent": 4,
            "sid": "s-1-5-18",
            "path": "c:\\windows\\system32\\smss.exe",
            "command_line": "\\systemroot\\system32\\smss.exe",
            "pid": 276,
            "proc_guid": "0000000a-0000-0114-01d0-14c0c80f42ec"
        }, ...
    ]
}

Note status is complete and the response includes a processes object that contains the list of currently running processes on sensor_id 10 WIN-EP7RMLTCLAJ.
Other commands function broadly the same way. See the documentation below and the python reference implementation for details. Happy hunting!

Close Sessions

To close a running session, you will need the session_id of the session you would like to close.

Request

curl -X PUT -H "Content-Type: application/json" -H "X-Auth-Token: d91b00774b2b903b49d8d9caa57ce9fcde16973a" -d '{"status": "close"}' http://127.0.0.1/api/v1/cblr/session/5

Response

{
    "status": "active",
    "sensor_id": 1,
    "supported_commands": [
        "delete file",
        "put file",
        "directory list",
        "get file",
        "kill",
        "create process",
        "process list",
        "create directory"
    ],
    "drives": [],
    "storage_size": "81012",
    "create_time": 1531853425.390842,
    "sensor_wait_timeout": 120,
    "address": "144.121.3.50",
    "check_in_timeout": 1200,
    "id": 5,
    "close_time": 1531854097.192009,
    "hostname": "devr-test",
    "storage_ttl": 7,
    "os_version": "",
    "session_timeout": 300,
    "current_working_directory": "/opt/cbsensor"
}

Note: Status is still active, but if you request the status of the session using GET http://127.0.0.1/api/v1/cblr/session/5 after a few seconds, you should receive a new response.

New Response

{
    "status": "close",
    "sensor_id": 1,
    "supported_commands": [
        "delete file",
        "put file",
        "directory list",
        "get file",
        "kill",
        "create process",
        "process list",
        "create directory"
    ],
    "drives": [],
    "storage_size": "81012",
    "create_time": 1531853425.390842,
    "sensor_wait_timeout": 120,
    "address": "144.121.3.50",
    "check_in_timeout": 1200,
    "id": 5,
    "close_time": 1531854097.192009,
    "hostname": "devr-test",
    "storage_ttl": 7,
    "os_version": "",
    "session_timeout": 300,
    "current_working_directory": "/opt/cbsensor"
}

Note: status is now closed.

API Reference

Establish Live Response Session

/api/v1/cblr/session/(id)

Supports GET, POST

GET - returns a list of all current session objects
GET - with (id) - returns a single session object if it exists
POST - starts a new session (given a sensor id), returns a session id

URL Parameters

wait: OPTIONAL True/False - Blocks the response until a session is available.

GET returns

Returns cblr_sensor session object with the following elements:

id: the current session id
sensor_id: the sensor id for this session
status: The current sensor live response status (“active”, “pending”, “timeout”, “inactive”, “close”) - Set status to close and PUT the object to close out the session
os_version: The current OS version of the sensor
current_working_directory: The path to the current working directory of the sensor
drives: An array of the logical drives available on the system
supported_commands: An array listing out the supported commands on the sensor (for when we support multiple commands across different architectures. (Note: These are 1:1 mapped with the name in the JSON command object (below))
check_in_timeout: the timeout (in seconds) - how long should the CB server wait for the sensor to enter live mode (check-in) (default is wait 1200 seconds - 20 minutes)
session_timeout: the timeout (in seconds) that a sensor should wait between commands. If no command is issued over this timeout the sensor will quit. By default this is 8 minutes

POST accepts

The POST request accepts the following fields in a JSON payload:

sensor_id - the sensor id to start the session for
checkin_timeout (optional) (see cblr_sensor)
default_command_timeout (optional) (see cblr_sensor)
sensor_wait_timeout (optional) (see cblr_sensor)

POST returns

JSON “cblr_sensor” (see above) Note: only the id will be set in the cblr_sensor until the session has checked in.

Reset Session Timeout

/api/v1/cblr/session/(id)/keepalive

Supports GET

Tells the server to reset the sensor “sensor_wait_timeout” if no commands have been sent to the sensor.
This should be leveraged by interactive processes to keep a session alive when there is no command activity past the “sensor_wait_timeout” period. A request to the endpoint should be made in a time period less than the sensor_wait_timeout time.

Download Archive of Session Contents

/api/v1/cblr/session/(id)/archive

Supports GET

Returns a compressed archive of all the session contents: log of all commands, their results, contents of all files, etc.

Upload File to Server

/api/v1/cblr/session/(id)/file

Supports POST

POST - uploads a file to the CB Response server, so it can be pushed to the sensor using the put file command (below).

Use a standard multipart/form-data file upload (such as used by curl’s -F command line option) to upload the file to the server with the file contents included in the file form field.

Example

To upload the file /tmp/blah.txt to the CB Response server so that it can be uploaded to a remote endpoint through Live Response’s put file command:

$ curl -X POST https://127.0.0.1/api/v1/cblr/session/18/file -H X-Auth-Token:d91b00774b2b903b49d8d9caa57ce9fcde16973a -F file=@/tmp/blah.txt

{"status": 0, "file_name": "blah.txt", "size_uploaded": 15, "size": 15, "id": 5, "delete": false}

The file ID is now 5, which you can pass into the put file command (below).

Download File from Server

/api/v1/cblr/session/(id)/file/(file_id)/contents

Supports GET

GET - downloads the file contents specified by the file_id

Example

The following command will download the contents of file ID 5 (from above)

$ curl https://127.0.0.1/api/v1/cblr/session/18/file/5/content -H X-Auth-Token:d91b00774b2b903b49d8d9caa57ce9fcde16973a

Send Command to Endpoint

/api/v1/cblr/session/(id)/command

Supports GET, POST

GET - returns a list of commands in this session
POST - creates a new command for this session

URL Parameters

status: OPTIONAL completed/in progress/canceled - filter results based on command status
count: OPTIONAL int - limit to X results returned

See Command Objects below for command object details.

Get Status of Command

/api/v1/cblr/session/(id)/command/(cmdid)

Supports GET, PUT

GET - with (cmdid) - returns the status for the specified command
PUT - with (cmdid) - cancel the specified command if status is pending

See Command Objects below for command object details.

Get File Metadata

/api/v1/cblr/session/(id)/file/(file_id)

Supports GET, PUT

GET - returns a list of files for this session
GET - with (file_id) - returns the file object for the specified id
PUT - with (file_id) - deletes a file object from the server
DELETE - with (file_id) - deletes a file object from the server

GET returns

Returns a file object with the following fields: - id: the file id - file_name : the (remote) path of the file - size : the size of the file - size_uploaded : the size of the full uploaded (from the sensor) so far - status: A status code, result for the file request. 0 for success or non-zero for error. - delete : By default this is “false”, (on PUT) set to “true” to force file deletion

PUT this object with delete set to true or use the DELETE HTTP verb to delete a file from the server’s store.

Get File Content

/api/v1/cblr/session/(id)/file/(file_id)/content

Supports GET

Return the raw contents of the specified file.

Command Objects

The contents of the command request object will vary based on the command requested and the context. Fields present in all command objects:

id: id of this command
session_id: the id of the session
sensor_id: the sensor id for the session
command_timeout: the timeout (in seconds) that the sensor is willing to wait until the command completes.
status: One of the following: “in progress”, “complete”, “cancel”, “error”
name: The name of the command (ie “reg set”, “reg query”, “get file”….)
object: the object the command operates on. This is specific to the command but has meaning in a generic way for logging, and display purposes

Fields present when command completes:

completion_time: the time the command completed or 0 if still in progres

These are present if “error” is set in the status.

result_code: the result/status (0 if successful) or an error code if unsuccessful
result_type: “WinHresult”, “CbError”, etc
result_desc: Optional error string describing the error

The remaining fields are specific to each requested built-in command:

put file

name: “put file”
object: the destination path of the file
file_id: the file id of the file in session storage (use second api to add new files)

get file

name: “get file”
object: the source path of the file
offset: a byte offset to start getting the file. Supports a partial get.
get_count: the number of bytes to grab

Response Object

file_id: the file id of the file (must use second API call to obtain the file)

delete file

name: “delete file”
object: the source path of the object to delete

directory listing

name: “directory list”
object: the directory listing filter (or path)

Response Object

files: an array of file list objects, which contain:
- attributes: an array of attribute strings representations of windows file attributes, with the FILEATfTRIBUTE part removed (ie DEVICE, DIRECTORY, HIDDEN, …..)
- create_time: in unix time format
- last_access_time: in unix time format
- last_write_time: in unix time format
- size: the size of the file
- name: the name of the file
- alt_name: the Windows “alternate name” (short name) of the file

reg enum key

name: “reg enum key”
object: the path of the key to query

Response Object

values: an array of registry values which contain:
- value_type: the string representation of the registry value type (ie REG_DWORD, REG_QWORD, ….)
- value_name: the name of the registry value
- value_data: the data associated with the registry value
- sub_keys : an array of subkey names (ie { “sub_keys” : [“some_sub_key” , “some_other_sub_key”]}

reg query value

name: “reg query value”
object: the path of the key + the path of the value (ie HKEY_LOCAL_MACHINE\blah\key\value)

Response Object

value: See the values object returned in the “values” field of reg enum key

reg create key

name: “reg create key”
object: the key path to create

reg delete key

name: “reg delete key”
object: the key path to delete

reg delete value

name : “reg delete value”
object: the path of the key + the path of the value

reg set value

name: “reg set value”
object: the path of the key + the path of the value
value_data: the data to set for the value. Note if value_data is for type REG_MULTI_SZ then value_data should be an array of strings. ie “value_data” : [“string1”, “string2”, “string3”],
value_type: one of common reg value types (in string form). Ie REG_DWORD, REG_QWORD, REG_SZ, …..
overwrite: “true” or “false”. An optional parameter to specify whether to overwrite the value if it already exists (default value is “false”)

ps

name: “process list”
object: empty

Response Object

processes: an array of process objects which contain:
pid: process id
create_time: the creation time of the process in unix time
proc_guid: the process guid of the process
path: the execution path of the process
command_line: the command line of the process
sid: the Security Identifier (SID) of the default process token
username: the username of the default process token
parent: the pid (process id ) of the parent
parent_guid: the process guid of the parent process

kill

name: “kill”
object: the pid to kill

execute

name: “create process”
object: the path and command line of the executable
wait: “true” or “false” - An optional parameter to specify whether to wait for the process to complete execution before reporting the result
working_directory: An optional parameter to specify the working directory of the executable
output_file: An option file that STDERR and STDOUT will be redirected to.

Response Object

pid: the pid of the executed process
return_code: the return code of the process (if wait was set to “true”)

memdump

Note: Only available on CB Response Server versions 5.1 and above, and requires that the target endpoint is running a sensor version 5.1 and above as well.

name: “memdump”
object: the path to save the resulting memory dump (on the endpoint)

Response Object

return_code: return code of the memory dump process
complete: boolean flag indicating if memory dump is completed
percentdone: percent of the process completed
dumping: boolean flag indicating if memory dump is in progress

Live Response Configuration Settings

Live Response settings can be configured on your CB Response Server by editing your /etc/cb/cb.conf file. For cloud instances, please contact support to have these settings changed.

Enable/Disable CBLR

Enable/Disable CBLR functionality. Disabled by default

CbLREnabled=False

Note:: CB Response Global administrators can enable or disable Live Response on the Advanced Settings page (in the UI), but only if CbLREnabled is removed from cb.conf or commented out. If CbLREnabled is present in cb.conf, global administrators cannot change its state on the Advanced Settings page.

Timeout to Initialize Session

Timeout (in seconds) to wait for sensor to initialize cblr session (20 minutes).On expiration, cblr session is discarded.

CbLRCheckinTimeout=1200

Max Time

Max time (in seconds) for sensor to wait for a cblr command (5 minutes)

CbLRSessionTimeout=300

Long Poll Duration

Long poll duration (in seconds) of the sensor command query before returning keepalive

CbLRSensorWaitTimeout=120

Max Disk Space

Max disk space (in megabytes) usable by cblr functionality. When exceeded, all requests that could possibly require more disk space will be rejected. 0 indicates unlimited.

CbLRMaxStoreSizeMB=0

Default Time-to-live

Default time-to-live (in days) for session data. Unless overwritten through the API, session data will be deleted CbLrDefaultSessionTTLDays following the close of the session.

New to CB Response 6.3+: Floating point values may be specified for CbLrDefaultSessionTTLDays (e.g. CbLrDefaultSessionTTLDays=0.01). Note that the thread that deletes the session data only runs hourly, so you may still need to wait up to one hour past the specified time interval for the deletion to occur.

CbLrDefaultSessionTTLDays=7

Max Sessions

cb-liveresponse will not allow more than CbLRMaxActiveSessions concurrent active sessions. Requests to create more than CbLRMaxActiveSessions will be rejected.

CbLRMaxActiveSessions=10

Last modified on March 19, 2019

CB Response

API Reference

Page Contents

Live Response API Reference

Examples

View Current Sessions

Parameters

Start a New Session

Issue Commands

Close Sessions

API Reference

Establish Live Response Session

Reset Session Timeout

Download Archive of Session Contents

Upload File to Server

Download File from Server

Send Command to Endpoint

Get Status of Command

Get File Metadata

Get File Content

Command Objects

put file

get file

delete file

directory listing

reg enum key

reg query value

reg create key

reg delete key

reg delete value

reg set value

ps

kill

execute

memdump

Live Response Configuration Settings

Enable/Disable CBLR

Timeout to Initialize Session

Max Time

Long Poll Duration

Max Disk Space

Default Time-to-live

Max Sessions