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https://github.com/splunk/security_content
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Patrick Bareiss
41 lines
1.7 KiB
YAML
41 lines
1.7 KiB
YAML
name: Malicious PowerShell Process - Encoded Command
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id: c4db14d9-7909-48b4-a054-aa14d89dbb19
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version: 4
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date: '2020-07-21'
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description: This search looks for PowerShell processes that have encoded the script
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within the command-line. Malware has been seen using this parameter, as it obfuscates
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the code and makes it relatively easy to pass a script on the command-line.
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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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type: ESCU
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references: []
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author: David Dorsey, Splunk
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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_name = powershell.exe
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(Processes.process=*-EncodedCommand* OR Processes.process=*-enc*)
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by Processes.user Processes.process_name Processes.process Processes.parent_process_name Processes.dest Processes.process_id
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| `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`| `security_content_ctime(lastTime)`
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| `malicious_powershell_process___encoded_command_filter`'
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known_false_positives: System administrators may use this option, but it's not common.
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tags:
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analytics_story:
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- Malicious PowerShell
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mitre_attack_id:
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- T1027
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kill_chain_phases:
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- Command and Control
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- Actions on Objectives
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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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nist:
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- PR.PT
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- DE.CM
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- PR.IP
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security_domain: endpoint
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asset_type: Endpoint
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