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https://github.com/splunk/security_content
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Gowthamaraj rajendran
92 lines
3.5 KiB
YAML
92 lines
3.5 KiB
YAML
name: CMD Echo Pipe - Escalation
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id: eb277ba0-b96b-11eb-b00e-acde48001122
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version: 2
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date: '2023-07-10'
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author: Michael Haag, Splunk
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status: production
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type: TTP
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description: This analytic identifies a common behavior by Cobalt Strike and other
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frameworks where the adversary will escalate privileges, either via `jump` (Cobalt
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Strike PTH) or `getsystem`, using named-pipe impersonation. A suspicious event will
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look like `cmd.exe /c echo 4sgryt3436 > \\.\Pipe\5erg53`.
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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 `process_cmd` OR Processes.process=*%comspec%*
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(Processes.process=*echo* AND Processes.process=*pipe*) by Processes.dest Processes.user
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Processes.parent_process Processes.parent_process_name Processes.process_name Processes.original_file_name
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Processes.process Processes.process_id Processes.parent_process_id | `drop_dm_object_name(Processes)`
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| `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `cmd_echo_pipe___escalation_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: Unknown. It is possible filtering may be required to ensure
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fidelity.
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references:
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- https://redcanary.com/threat-detection-report/threats/cobalt-strike/
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- https://github.com/rapid7/meterpreter/blob/master/source/extensions/priv/server/elevate/namedpipe.c
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tags:
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analytic_story:
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- BlackByte Ransomware
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- Cobalt Strike
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- Graceful Wipe Out Attack
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asset_type: Endpoint
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confidence: 80
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impact: 80
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message: An instance of $parent_process_name$ spawning $process_name$ was identified
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on endpoint $dest$ by user $user$ potentially performing privilege escalation
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using named pipes related to Cobalt Strike and other frameworks.
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mitre_attack_id:
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- T1059
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- T1059.003
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- T1543.003
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- T1543
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observable:
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- name: user
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type: User
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role:
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- Victim
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- name: dest
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type: Hostname
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role:
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- Victim
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- name: parent_process_name
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type: Process
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role:
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- Parent Process
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- name: process_name
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type: Process
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role:
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- Child Process
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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.original_file_name
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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_path
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- Processes.process_path
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- Processes.parent_process_id
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risk_score: 64
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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/attack_techniques/T1055/cobalt_strike/windows-sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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