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https://github.com/splunk/security_content
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Michael Haag
74 lines
2.8 KiB
YAML
74 lines
2.8 KiB
YAML
name: Powershell Load Module in Meterpreter
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id: d5905da5-d050-48db-9259-018d8f034fcf
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version: 1
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date: '2022-11-22'
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author: Michael Haag, Splunk
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type: TTP
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datamodel: []
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description: 'The following analytic utilizes PowerShell Script Block Logging (EventCode=4104)
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to identify suspicious PowerShell execution. Script Block Logging captures the command
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sent to PowerShell, the full command to be executed. Upon enabling, logs will output
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to Windows event logs. Dependent upon volume, enable on critical endpoints or all.
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\
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This analytic identifies "MSF.Powershell","MSF.Powershell.Meterpreter","MSF.Powershell.Meterpreter.Kiwi","MSF.Powershell.Meterpreter.Transport" being used. This behavior is related to when a Meterpreter session is started and the operator runs load_kiwi. \
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During triage, review parallel processes using an EDR product or 4688 events. It
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will be important to understand the timeline of events around this activity. Review
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the entire logged PowerShell script block.'
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search: '`powershell` EventCode=4104 ScriptBlockText IN ("*MSF.Powershell*","*MSF.Powershell.Meterpreter*","*MSF.Powershell.Meterpreter.Kiwi*","*MSF.Powershell.Meterpreter.Transport*")
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| stats count min(_time) as firstTime max(_time) as lastTime by EventCode ScriptBlockText Computer user_id
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| `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`
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| `powershell_load_module_in_meterpreter_filter`'
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how_to_implement: The following analytic requires PowerShell operational logs
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to be imported. Modify the powershell macro as needed to match the sourcetype or
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add index. This analytic is specific to 4104, or PowerShell Script Block Logging.
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known_false_positives: False positives should be very limited as this is strict to MetaSploit behavior.
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references:
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- https://github.com/OJ/metasploit-payloads/blob/master/powershell/MSF.Powershell/Scripts.cs
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tags:
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analytic_story:
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- MetaSploit
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asset_type: Endpoint
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cis20:
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- CIS 3
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- CIS 5
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- CIS 16
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confidence: 100
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context:
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- Source:Endpoint
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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/T1059/metasploit/msf.powershell.powershell.log
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impact: 100
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kill_chain_phases:
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- Exploitation
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message: PowerShell was identified running a script utilized by Meterpreter from MetaSploit on endpoint
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$Computer$ by user $user_id$.
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mitre_attack_id:
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- T1059
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- T1059.001
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observable:
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- name: user_id
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type: User
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role:
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- Victim
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- name: Computer
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type: Hostname
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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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- EventCode
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- ScriptBlockText
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- Computer
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- User_id
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risk_score: 100
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security_domain: endpoint
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asset_type: Endpoint
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