mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Christian Cloutier
283 lines
12 KiB
Python
283 lines
12 KiB
Python
"""
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Accepts a hostname or device id as well as a file hash as input and add an indicator (IOC) for a device in Crowdstrike. We then generate an observable report as well as a Markdown formatted report. Both reports can be customized based on user preference.
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"""
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import phantom.rules as phantom
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import json
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from datetime import datetime, timedelta
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@phantom.playbook_block()
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def on_start(container):
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phantom.debug('on_start() called')
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# call 'input_filter' block
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input_filter(container=container)
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return
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@phantom.playbook_block()
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def input_filter(action=None, success=None, container=None, results=None, handle=None, filtered_artifacts=None, filtered_results=None, custom_function=None, loop_state_json=None, **kwargs):
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phantom.debug("input_filter() called")
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################################################################################
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# Determines if the provided inputs are present in the dataset.
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################################################################################
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# collect filtered artifact ids and results for 'if' condition 1
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matched_artifacts_1, matched_results_1 = phantom.condition(
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container=container,
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logical_operator="and",
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conditions=[
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["playbook_input:device", "!=", ""],
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["playbook_input:hash", "!=", ""]
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],
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name="input_filter:condition_1",
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delimiter=None)
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# call connected blocks if filtered artifacts or results
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if matched_artifacts_1 or matched_results_1:
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format_fql(action=action, success=success, container=container, results=results, handle=handle, filtered_artifacts=matched_artifacts_1, filtered_results=matched_results_1)
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return
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@phantom.playbook_block()
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def file_observables(action=None, success=None, container=None, results=None, handle=None, filtered_artifacts=None, filtered_results=None, custom_function=None, loop_state_json=None, **kwargs):
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phantom.debug("file_observables() called")
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################################################################################
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# Format a normalized output for each host
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################################################################################
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query_device_result_data = phantom.collect2(container=container, datapath=["query_device:action_result.data.*.device_id","query_device:action_result.data.*.hostname"], action_results=results)
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filtered_input_0_hash = phantom.collect2(container=container, datapath=["filtered-data:input_filter:condition_1:playbook_input:hash"])
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upload_indicator_result_data = phantom.collect2(container=container, datapath=["upload_indicator:action_result.status","upload_indicator:action_result.message"], action_results=results)
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query_device_result_item_0 = [item[0] for item in query_device_result_data]
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query_device_result_item_1 = [item[1] for item in query_device_result_data]
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filtered_input_0_hash_values = [item[0] for item in filtered_input_0_hash]
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upload_indicator_result_item_0 = [item[0] for item in upload_indicator_result_data]
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upload_indicator_result_message = [item[1] for item in upload_indicator_result_data]
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file_observables__observable_array = None
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################################################################################
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## Custom Code Start
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################################################################################
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file_observables__observable_array = []
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for device_id, hostname, file_hash, status, status_message in zip(query_device_result_item_0, query_device_result_item_1, filtered_input_0_hash_values, upload_indicator_result_item_0, upload_indicator_result_message):
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# Initialize the observable dictionary
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observable = {
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"source": "Crowdstrike OAuth API",
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"type": "Endpoint",
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"activity_name": "File Execution Prevention",
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"uid": device_id,
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"hostname": hostname,
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"status": status,
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"status_detail": status_message,
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"file": {
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"hashes": [
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{
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"algorithm": "SHA-256",
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"algorithm_id": 3,
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"value": file_hash
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}
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]
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},
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"d3fend": {
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"d3f_tactic": "Isolate",
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"d3f_technique": "D3-EDL",
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"version": "1.0.0"
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}
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}
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# Add the observable to the array
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file_observables__observable_array.append(observable)
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# Debug output for verification
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phantom.debug(file_observables__observable_array)
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################################################################################
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## Custom Code End
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################################################################################
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phantom.save_run_data(key="file_observables:observable_array", value=json.dumps(file_observables__observable_array))
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return
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@phantom.playbook_block()
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def format_fql(action=None, success=None, container=None, results=None, handle=None, filtered_artifacts=None, filtered_results=None, custom_function=None, loop_state_json=None, **kwargs):
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phantom.debug("format_fql() called")
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################################################################################
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# Format the FQL query to get the input device information using its ID or hostname.
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################################################################################
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template = """%%\nhostname:['{0}'],device_id:['{0}']\n%%"""
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# parameter list for template variable replacement
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parameters = [
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"playbook_input:device"
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]
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################################################################################
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## Custom Code Start
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################################################################################
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# Write your custom code here...
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################################################################################
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## Custom Code End
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################################################################################
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phantom.format(container=container, template=template, parameters=parameters, name="format_fql")
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query_device(container=container)
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return
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@phantom.playbook_block()
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def query_device(action=None, success=None, container=None, results=None, handle=None, filtered_artifacts=None, filtered_results=None, custom_function=None, loop_state_json=None, **kwargs):
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phantom.debug("query_device() called")
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# phantom.debug('Action: {0} {1}'.format(action['name'], ('SUCCEEDED' if success else 'FAILED')))
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################################################################################
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# Get information about the device to unquarantine using its hostname or device
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# id.
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################################################################################
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format_fql__as_list = phantom.get_format_data(name="format_fql__as_list")
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parameters = []
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# build parameters list for 'query_device' call
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for format_fql__item in format_fql__as_list:
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parameters.append({
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"limit": 50,
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"filter": format_fql__item,
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})
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################################################################################
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## Custom Code Start
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################################################################################
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# Write your custom code here...
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################################################################################
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## Custom Code End
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################################################################################
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phantom.act("query device", parameters=parameters, name="query_device", assets=["crowdstrike_oauth_api"], callback=upload_indicator)
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return
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@phantom.playbook_block()
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def format_executable_denylisting_report(action=None, success=None, container=None, results=None, handle=None, filtered_artifacts=None, filtered_results=None, custom_function=None, loop_state_json=None, **kwargs):
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phantom.debug("format_executable_denylisting_report() called")
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################################################################################
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# Format a summary table with the information gathered from the playbook.
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################################################################################
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template = """Endpoint Files were denylisted by Splunk SOAR. The table below summarizes the information gathered.\n\n| Device ID | Executable Hash | Action | Denylisting Status | Message |\n| --- | --- | --- | --- | --- |\n%%\n| {0} | {1} | {2} | {3} | {4} |\n%%"""
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# parameter list for template variable replacement
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parameters = [
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"query_device:action_result.data.*.device_id",
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"filtered-data:input_filter:condition_1:playbook_input:hash",
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"upload_indicator:action_result.parameter.action",
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"upload_indicator:action_result.status",
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"upload_indicator:action_result.message"
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]
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################################################################################
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## Custom Code Start
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################################################################################
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# Write your custom code here...
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################################################################################
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## Custom Code End
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################################################################################
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phantom.format(container=container, template=template, parameters=parameters, name="format_executable_denylisting_report")
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file_observables(container=container)
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return
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@phantom.playbook_block()
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def upload_indicator(action=None, success=None, container=None, results=None, handle=None, filtered_artifacts=None, filtered_results=None, custom_function=None, loop_state_json=None, **kwargs):
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phantom.debug("upload_indicator() called")
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# phantom.debug('Action: {0} {1}'.format(action['name'], ('SUCCEEDED' if success else 'FAILED')))
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################################################################################
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# Upload indicator that we want CrowdStrike to prevent and watch for all platforms.
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################################################################################
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filtered_input_0_hash = phantom.collect2(container=container, datapath=["filtered-data:input_filter:condition_1:playbook_input:hash"])
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parameters = []
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# build parameters list for 'upload_indicator' call
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for filtered_input_0_hash_item in filtered_input_0_hash:
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if filtered_input_0_hash_item[0] is not None:
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parameters.append({
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"ioc": filtered_input_0_hash_item[0],
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"action": "prevent",
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"source": "IOC uploaded via Splunk SOAR",
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"severity": "MEDIUM",
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"platforms": "linux,mac,windows",
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"description": "File Indicator blocked from Splunk SOAR",
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})
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################################################################################
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## Custom Code Start
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################################################################################
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# Write your custom code here...
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################################################################################
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## Custom Code End
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################################################################################
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phantom.act("upload indicator", parameters=parameters, name="upload_indicator", assets=["crowdstrike_oauth_api"], callback=format_executable_denylisting_report)
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return
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@phantom.playbook_block()
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def on_finish(container, summary):
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phantom.debug("on_finish() called")
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format_executable_denylisting_report = phantom.get_format_data(name="format_executable_denylisting_report")
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file_observables__observable_array = json.loads(_ if (_ := phantom.get_run_data(key="file_observables:observable_array")) != "" else "null") # pylint: disable=used-before-assignment
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output = {
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"observable": file_observables__observable_array,
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"markdown_report": format_executable_denylisting_report,
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}
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################################################################################
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## Custom Code Start
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################################################################################
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# Write your custom code here...
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################################################################################
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## Custom Code End
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################################################################################
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phantom.save_playbook_output_data(output=output)
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return |