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https://github.com/splunk/security_content
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Eric
70 lines
3.2 KiB
YAML
70 lines
3.2 KiB
YAML
name: Powershell Enable SMB1Protocol Feature
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id: afed80b2-d34b-11eb-a952-acde48001122
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version: 8
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date: '2025-05-02'
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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*" | fillnull | stats count min(_time) as firstTime
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max(_time) as lastTime by dest signature signature_id user_id vendor_product EventID
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Guid Opcode Name Path ProcessID ScriptBlockId ScriptBlockText | `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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drilldown_searches:
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- name: View the detection results for - "$Computer$"
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search: '%original_detection_search% | search Computer = "$Computer$"'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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- name: View risk events for the last 7 days for - "$Computer$"
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search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$Computer$")
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starthoursago=168 | stats count min(_time) as firstTime max(_time) as lastTime
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values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories)
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as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic)
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as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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rba:
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message: Powershell Enable SMB1Protocol Feature on $dest$
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risk_objects:
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- field: dest
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type: system
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score: 25
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threat_objects: []
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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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mitre_attack_id:
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- T1027.005
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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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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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