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https://github.com/splunk/security_content
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patel-bhavin
61 lines
2.1 KiB
YAML
61 lines
2.1 KiB
YAML
name: Powershell Enable SMB1Protocol Feature
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id: afed80b2-d34b-11eb-a952-acde48001122
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version: 2
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date: '2023-04-14'
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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: This search is to detect a suspicious enabling of smb1protocol through
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`powershell.exe`. This technique was seen in some ransomware (like reddot) where
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it enable smb share to do the lateral movement and encrypt other files within the
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compromise network system.
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data_source:
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- Powershell 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: 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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