mirror of
https://github.com/splunk/security_content
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Bhavin Patel
65 lines
2.4 KiB
YAML
65 lines
2.4 KiB
YAML
name: Powershell Enable SMB1Protocol Feature
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id: afed80b2-d34b-11eb-a952-acde48001122
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version: 3
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date: '2024-05-13'
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author: Teoderick Contreras, Splunk
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status: production
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type: TTP
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description: The following analytic detects the enabling of the SMB1 protocol via
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`powershell.exe`. It leverages PowerShell script block logging (EventCode 4104)
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to identify the execution of the `Enable-WindowsOptionalFeature` cmdlet with the
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`SMB1Protocol` parameter. This activity is significant because enabling SMB1 can
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facilitate lateral movement and file encryption by ransomware, such as RedDot. If
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confirmed malicious, this action could allow an attacker to propagate through the
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network, encrypt files, and potentially disrupt business operations.
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data_source:
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- Powershell Script Block Logging 4104
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search: '`powershell` EventCode=4104 ScriptBlockText = "*Enable-WindowsOptionalFeature*"
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ScriptBlockText = "*SMB1Protocol*" | stats count min(_time) as firstTime max(_time)
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as lastTime by EventCode ScriptBlockText Computer UserID | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `powershell_enable_smb1protocol_feature_filter`'
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how_to_implement: To successfully implement this search, you need to be ingesting
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logs with the powershell logs from your endpoints. make sure you enable needed
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registry to monitor this event.
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known_false_positives: network operator may enable or disable this windows feature.
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references:
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- https://app.any.run/tasks/c0f98850-af65-4352-9746-fbebadee4f05/
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- https://www.splunk.com/en_us/blog/security/hunting-for-malicious-powershell-using-script-block-logging.html
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tags:
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analytic_story:
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- Ransomware
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- Malicious PowerShell
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- Hermetic Wiper
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- Data Destruction
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asset_type: Endpoint
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confidence: 50
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impact: 50
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message: Powershell Enable SMB1Protocol Feature on $Computer$
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mitre_attack_id:
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- T1027
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- T1027.005
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observable:
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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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- UserID
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risk_score: 25
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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:
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https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1059.001/powershell_script_block_logging/sbl_xml.log
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source: XmlWinEventLog:Microsoft-Windows-PowerShell/Operational
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sourcetype: xmlwineventlog
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