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https://github.com/splunk/security_content
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Michael Haag
74 lines
2.7 KiB
YAML
74 lines
2.7 KiB
YAML
name: Malicious PowerShell Process - Encoded Command
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id: c4db14d9-7909-48b4-a054-aa14d89dbb19
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version: 5
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date: '2020-07-21'
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author: David Dorsey, Splunk
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type: Hunting
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datamodel:
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- Endpoint
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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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search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
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as lastTime from datamodel=Endpoint.Processes where `process_powershell`
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(Processes.process=*-EncodedCommand* OR Processes.process=*-enc*) by Processes.user
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Processes.process_name Processes.process Processes.parent_process_name Processes.original_file_name Processes.dest
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Processes.process_id | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`|
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`security_content_ctime(lastTime)` | `malicious_powershell_process___encoded_command_filter`'
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how_to_implement: To successfully implement this search you need to be ingesting information on process that include the name of the process responsible for the changes from your endpoints into the `Endpoint` datamodel in the `Processes` node. In addition, confirm the latest CIM App 4.20 or higher is installed and the latest TA for the endpoint product.
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known_false_positives: System administrators may use this option, 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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- NOBELIUM Group
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asset_type: Endpoint
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automated_detection_testing: passed
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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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confidence: 50
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context:
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- Source:Endpoint
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- Stage:Initial Access
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- Stage:Execution
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- Stage:Defense Evasion
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1027/atomic_red_team/windows-sysmon.log
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impact: 70
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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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message: Powershell.exe running potentially malicious encodede commands on $dest$
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mitre_attack_id:
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- T1027
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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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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 #parent process name
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- Processes.parent_process #parent cmdline
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- Processes.original_file_name
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- Processes.process_name #process name
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- Processes.process #process cmdline
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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: 35
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security_domain: endpoint
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