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Add new DFIQ YAML files and update copyright header in existing ones.
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| Original file line number | Diff line number | Diff line change |
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| # Copyright 2024 Google LLC | ||
| # | ||
| # Licensed under the Apache License, Version 2.0 (the "License"); | ||
| # you may not use this file except in compliance with the License. | ||
| # You may obtain a copy of the License at | ||
| # | ||
| # https://www.apache.org/licenses/LICENSE-2.0 | ||
| # | ||
| # Unless required by applicable law or agreed to in writing, software | ||
| # distributed under the License is distributed on an "AS IS" BASIS, | ||
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| # See the License for the specific language governing permissions and | ||
| # limitations under the License. | ||
|
|
||
| --- | ||
| display_name: Use Crowdstrike "Bulk Domains" to link source processes to DNS queries | ||
| type: approach | ||
| id: Q1018.10 | ||
| dfiq_version: 1.0.0 | ||
| tags: | ||
| - CrowdStrike | ||
| - DNS | ||
| description: | ||
| summary: CrowdStrike records the source process ID (ContextProcessId) for DNSRequest event. | ||
| details: > | ||
| Crowdstrike is a detection platform, not a logging platform, so not all DNS requests are logged. | ||
| Content Filter needs to be enabled to capture DNS request queries. | ||
| references: | ||
| - https://www.crowdstrike.com/blog/hunt-threat-activity-falcon-host-endpoint-protection/bulk-domain-search-results/ | ||
| view: | ||
| data: | ||
| - type: CrowdStrike | ||
| value: DnsRequest | ||
| notes: | ||
| covered: | ||
| - Mac, Linux, and Windows hosts with a CrowdStrike Falcon agent | ||
| not_covered: | ||
| - Hosts with the Falcon agent, but where the Content Filter is not enabled | ||
| processors: | ||
| - name: Crowdstrike Investigate (UI) | ||
| analysis: | ||
| - name: Manual | ||
| steps: | ||
| - description: UI steps in Investigate Bulk domains | ||
| type: GUI | ||
| value: > | ||
| In the second table, `Process that looked up specified Domain(s)` the columns | ||
| `PID`, `Process ID`, and `File Name` give the source process information for the | ||
| DNS query. |
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| # Copyright 2024 Google LLC | ||
| # | ||
| # Licensed under the Apache License, Version 2.0 (the "License"); | ||
| # you may not use this file except in compliance with the License. | ||
| # You may obtain a copy of the License at | ||
| # | ||
| # https://www.apache.org/licenses/LICENSE-2.0 | ||
| # | ||
| # Unless required by applicable law or agreed to in writing, software | ||
| # distributed under the License is distributed on an "AS IS" BASIS, | ||
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| # See the License for the specific language governing permissions and | ||
| # limitations under the License. | ||
|
|
||
| --- | ||
| display_name: Use Crowdstrike event search to link source processes to DNS queries | ||
| type: approach | ||
| id: Q1018.11 | ||
| dfiq_version: 1.0.0 | ||
| tags: | ||
| - CrowdStrike | ||
| - DNS | ||
| description: | ||
| summary: CrowdStrike records the source process ID (ContextProcessId) for DNSRequest event. | ||
| details: > | ||
| Crowdstrike is a detection platform, not a logging platform, so not all DNS requests are logged. | ||
| Content Filter needs to be enabled to capture DNS request queries. | ||
| references: | ||
| - https://www.crowdstrike.com/blog/hunt-threat-activity-falcon-host-endpoint-protection/bulk-domain-search-results/ | ||
| view: | ||
| data: | ||
| - type: CrowdStrike | ||
| value: DnsRequest | ||
| notes: | ||
| covered: | ||
| - Mac, Linux, and Windows hosts with a CrowdStrike Falcon agent | ||
| not_covered: | ||
| - Hosts with the Falcon agent, but where the Content Filter is not enabled | ||
| processors: | ||
| - name: Splunk | ||
| analysis: | ||
| - name: Splunk-Query | ||
| steps: | ||
| - description: Query joining DNS Request events and executions gives the source for each DNS query | ||
| type: splunk-query | ||
| value: ComputerName="{hostname}" event_simpleName=ProcessRollup* | rename TargetProcessId_decimal as ContextProcessId_decimal | join ContextProcessId_decimal [search ComputerName="{hostname}" event_simpleName=DnsRequest | fields ContextProcessId_decimal, DomainName] | table _time, DomainName, ImageFileName |
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| # Copyright 2024 Google LLC | ||
| # | ||
| # Licensed under the Apache License, Version 2.0 (the "License"); | ||
| # you may not use this file except in compliance with the License. | ||
| # You may obtain a copy of the License at | ||
| # | ||
| # https://www.apache.org/licenses/LICENSE-2.0 | ||
| # | ||
| # Unless required by applicable law or agreed to in writing, software | ||
| # distributed under the License is distributed on an "AS IS" BASIS, | ||
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| # See the License for the specific language governing permissions and | ||
| # limitations under the License. | ||
|
|
||
| --- | ||
| display_name: Use Sysmon (Event ID 22) to link source processes to DNS queries | ||
| type: approach | ||
| id: Q1018.12 | ||
| dfiq_version: 1.0.0 | ||
| tags: | ||
| - Sysmon | ||
| - DNS | ||
| - Windows | ||
| description: | ||
| summary: Sysmon Event ID 22 DnsQuery stores source process ID | ||
| details: > | ||
| DNS Query, event ID 22, records a DNS query being issued by a specific host and the originating process. | ||
| references: | ||
| - https://www.ultimatewindowssecurity.com/securitylog/encyclopedia/event.aspx?eventid=90022 | ||
| view: | ||
| data: | ||
| - type: ForensicArtifact | ||
| value: WindowsXMLEventLogSysmon | ||
| notes: | ||
| covered: | ||
| - Windows | ||
| not_covered: | ||
| - Windows hosts without Sysmon installed | ||
| processors: | ||
| - name: Splunk | ||
| analysis: | ||
| - name: Splunk-Query | ||
| steps: | ||
| - description: Query for Sysmon Event ID 22 and extracting the parent process ID and path. | ||
| type: splunk-query | ||
| value: source="xmlwineventlog:microsoft-windows-sysmon/operational" EventCode=22 | table _time, host, process_id, process_path | ||
| - name: Plaso | ||
| analysis: | ||
| - name: OpenSearch | ||
| steps: | ||
| - description: Query for Sysmon Event ID 22 events | ||
| type: opensearch-query | ||
| value: data_type:"windows:evtx:record" source_name:"Microsoft-Windows-Sysmon" event_identifier:22 | ||
| - description: Determine the source process in relevant event(s) | ||
| type: manual | ||
| value: > | ||
| Plaso (as of v20230717) doesn't parse the `xml_string` into attributes. Examine the | ||
| `xml_string`; the value after `<Data Name="Image">` is the process that made the | ||
| DNS query. | ||
| - name: Python Notebook | ||
| steps: | ||
| - description: Query for Sysmon Event ID 22 events | ||
| type: pandas | ||
| value: df.query('data_type == "windows:evtx:record" and source_name == "Microsoft-Windows-Sysmon" and event_identifier == 22') | ||
| - description: Extract `Image` attribute | ||
| type: pandas | ||
| value: df['process'] = df['xml_string'].str.extract(r'<Data Name="Image">(.*?)</Data>') | ||
| - description: Extract `QueryName` attribute | ||
| type: pandas | ||
| value: df['query'] = df['xml_string'].str.extract(r'<Data Name="QueryName">(.*?)</Data>') | ||
| - description: Filter down to DNS query of interest | ||
| type: pandas | ||
| value: df[df.query.str.contains('<domain>')] |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| # Copyright 2024 Google LLC | ||
| # | ||
| # Licensed under the Apache License, Version 2.0 (the "License"); | ||
| # you may not use this file except in compliance with the License. | ||
| # You may obtain a copy of the License at | ||
| # | ||
| # https://www.apache.org/licenses/LICENSE-2.0 | ||
| # | ||
| # Unless required by applicable law or agreed to in writing, software | ||
| # distributed under the License is distributed on an "AS IS" BASIS, | ||
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| # See the License for the specific language governing permissions and | ||
| # limitations under the License. | ||
|
|
||
| --- | ||
| display_name: Collect process executions in Crowdstrike event search | ||
| type: approach | ||
| id: Q1019.10 | ||
| dfiq_version: 1.0.0 | ||
| tags: | ||
| - CrowdStrike | ||
| - Process Execution | ||
| description: | ||
| summary: CrowdStrike records process executions in ProcessRollup event. | ||
| details: > | ||
| CrowdStrike is a detection platform, not a logging platform, so not all ProcessRollup events might be logged. | ||
| references: | ||
| - https://www.crowdstrike.com/blog/understanding-indicators-attack-ioas-power-event-stream-processing-crowdstrike-falcon/ | ||
| view: | ||
| data: | ||
| - type: CrowdStrike | ||
| value: ProcessRollup | ||
| notes: | ||
| covered: | ||
| - Mac, Linux and Windows systems with the Falcon Agent | ||
| - Chrome, Firefox, Safari, and Edge web browsers | ||
| not_covered: | ||
| - Other browsers (including Chromium) | ||
| - One of those four browsers, but have had their process name changed | ||
| processors: | ||
| - name: Splunk | ||
| analysis: | ||
| - name: Splunk-Query | ||
| steps: | ||
| - description: Query filtering the known browsers in execution event logs. | ||
| type: splunk-query | ||
| value: ComputerName="{hostname}" event_simpleName=ProcessRollup* ImageFileName IN ("*chrome*", "*firefox*", "*safari*", "*edge*") | table _time, CommandLine, ImageFileName |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,50 @@ | ||
| # Copyright 2024 Google LLC | ||
| # | ||
| # Licensed under the Apache License, Version 2.0 (the "License"); | ||
| # you may not use this file except in compliance with the License. | ||
| # You may obtain a copy of the License at | ||
| # | ||
| # https://www.apache.org/licenses/LICENSE-2.0 | ||
| # | ||
| # Unless required by applicable law or agreed to in writing, software | ||
| # distributed under the License is distributed on an "AS IS" BASIS, | ||
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| # See the License for the specific language governing permissions and | ||
| # limitations under the License. | ||
|
|
||
| --- | ||
| display_name: Search CrowdStrike logs for Incognito Chrome processes | ||
| type: approach | ||
| id: Q1024.10 | ||
| dfiq_version: 1.0.0 | ||
| tags: | ||
| - CrowdStrike | ||
| - Process Execution | ||
| - Web Browser | ||
| description: | ||
| summary: CrowdStrike records the source process ID (ContextProcessId) for ProcessRollup events. | ||
| details: > | ||
| Crowdstrike is a detection platform, not a logging platform, so not all executions are logged. | ||
| We cannot always connect a running browser process with observed DNS requests. When we do see | ||
| DNS requests coming from a browser process, yet we don't see browsing history, there are | ||
| several possible explanations, including browser extensions or private browsing. | ||
| references: | ||
| - https://www.crowdstrike.com/blog/tech-center/hunt-threat-activity-falcon-endpoint-protection/ | ||
| view: | ||
| data: | ||
| - type: CrowdStrike | ||
| value: ProcessRollup | ||
| notes: | ||
| covered: | ||
| - Chrome on Mac, Linux, and Windows hosts with a CrowdStrike Falcon agent | ||
| not_covered: | ||
| - Chrome instances with a renamed process | ||
| - Other Chromium-based browsers | ||
| processors: | ||
| - name: Splunk | ||
| analysis: | ||
| - name: Splunk-Query | ||
| steps: | ||
| - description: Query searching for browser processes executed in private mode | ||
| type: splunk-query | ||
| value: ComputerName="{hostname}" event_simpleName=ProcessRollup* CommandLine IN ("*chrome*") CommandLine IN (*disable-databases*) | table _time, DomainName, CommandLine |
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