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https://github.com/splunk/security_content
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Rod Soto
66 lines
2.3 KiB
YAML
66 lines
2.3 KiB
YAML
name: Suspicious Powershell Command-Line Arguments
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id: 2cdb91d2-542c-497f-b252-be495e71f38c
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version: 6
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date: '2021-01-19'
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author: David Dorsey, Splunk
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type: TTP
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datamodel:
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- Endpoint
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description: This search looks for PowerShell processes started with a base64 encoded
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command-line passed to it, with parameters to modify the execution policy for the
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process, and those that prevent the display of an interactive prompt to the user.
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This combination of command-line options is suspicious because it overrides the
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default PowerShell execution policy, attempts to hide itself from the user, and
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passes an encoded script to be run on the command-line. Deprecated because almost
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the same as Malicious PowerShell Process - Encoded Command
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search: '| tstats `security_content_summariesonly` count values(Processes.process)
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as process values(Processes.parent_process) as parent_process min(_time) as firstTime
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max(_time) as lastTime from datamodel=Endpoint.Processes where Processes.process_name=powershell.exe
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by Processes.user Processes.process_name Processes.parent_process_name Processes.dest |
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`drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`| `security_content_ctime(lastTime)`|
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search (process=*-EncodedCommand* OR process=*-enc*) process=*-Exec* | `suspicious_powershell_command_line_arguments_filter`'
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how_to_implement: You must be ingesting data that records process activity from your
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hosts to populate the Endpoint data model in the Processes node. You must also be
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ingesting logs with both the process name and command line from your endpoints.
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The command-line arguments are mapped to the "process" field in the Endpoint data
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model.
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known_false_positives: Legitimate process can have this combination of command-line
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options, but it's not common.
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references: []
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tags:
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analytic_story:
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- Malicious PowerShell
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- Hermetic Wiper
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asset_type: Endpoint
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cis20:
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- CIS 3
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- CIS 7
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- CIS 8
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kill_chain_phases:
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- Command & Control
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- Actions on Objectives
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mitre_attack_id:
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- T1059.001
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nist:
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- PR.PT
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- DE.CM
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- PR.IP
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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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security_domain: endpoint
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confidence: 50
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impact: 50
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risk_score: 25
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context:
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- Unknown
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message: tbd
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observable:
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- name: field
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type: Unknown
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role:
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- Unknown
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