mirror of
https://github.com/splunk/security_content
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Bhavin Patel
78 lines
3.2 KiB
YAML
78 lines
3.2 KiB
YAML
name: Firewall Allowed Program Enable
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id: 9a8f63a8-43ac-11ec-904c-acde48001122
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version: 1
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date: '2021-11-12'
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author: Teoderick Contreras, Splunk
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status: production
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type: Anomaly
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description: The following analytic detects a potential suspicious modification of firewall
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rule allowing to execute specific application. This technique was identified when
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an adversary and red teams to bypassed firewall file execution restriction in a
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targetted host. Take note that this event or command can run by administrator during
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testing or allowing legitimate tool or application.
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data_source:
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- Sysmon Event ID 1
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search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
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as lastTime from datamodel=Endpoint.Processes where Processes.process = "*firewall*"
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Processes.process = "*allow*" Processes.process = "*add*" Processes.process = "*ENABLE*"
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by Processes.dest Processes.user Processes.parent_process_name Processes.parent_process
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Processes.process_name Processes.process Processes.process_id Processes.parent_process_id
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| `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `firewall_allowed_program_enable_filter`'
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how_to_implement: The detection is based on data that originates from Endpoint Detection
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and Response (EDR) agents. These agents are designed to provide security-related
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telemetry from the endpoints where the agent is installed. To implement this search,
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you must ingest logs that contain the process GUID, process name, and parent process.
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Additionally, you must ingest complete command-line executions. These logs must
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be processed using the appropriate Splunk Technology Add-ons that are specific to
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the EDR product. The logs must also be mapped to the `Processes` node of the `Endpoint`
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data model. Use the Splunk Common Information Model (CIM) to normalize the field
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names and speed up the data modeling process.
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known_false_positives: A network operator or systems administrator may utilize an
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automated or manual execution of this firewall rule that may generate false positives.
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Filter as needed.
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references:
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- https://app.any.run/tasks/ad4c3cda-41f2-4401-8dba-56cc2d245488/
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tags:
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analytic_story:
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- Windows Defense Evasion Tactics
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- Azorult
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- BlackByte Ransomware
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- NjRAT
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- PlugX
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asset_type: Endpoint
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confidence: 50
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impact: 50
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message: firewall allowed program commandline $process$ of $process_name$ on $dest$
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by $user$
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mitre_attack_id:
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- T1562.004
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- T1562
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observable:
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- name: dest
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type: Endpoint
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role:
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- Victim
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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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required_fields:
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- _time
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- Processes.dest
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- Processes.user
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- Processes.parent_process_name
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- Processes.parent_process
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- Processes.process_name
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- Processes.process
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- Processes.process_id
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- Processes.parent_process_id
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risk_score: 25
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security_domain: endpoint
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tests:
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- name: True Positive Test
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attack_data:
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- data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/vilsel/sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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