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P4T12ICK
62 lines
2.0 KiB
YAML
62 lines
2.0 KiB
YAML
name: Allow Network Discovery In Firewall
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id: ccd6a38c-d40b-11eb-85a5-acde48001122
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version: 2
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date: '2021-06-23'
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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 modification to the firewall to
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allow network discovery on a machine. This technique was seen in couple of ransomware
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(revil, reddot) to discover other machine connected to the compromised host to encrypt
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more files.
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data_source:
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- Sysmon Event ID 1
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search:
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selection1:
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OriginalFileName: netsh.exe
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selection2:
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Image|endswith: netsh.exe
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selection3:
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CommandLine: '*firewall*'
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selection4:
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CommandLine: '*group='
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condition: (selection1 or selection2) and selection3 and selection4
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how_to_implement: To successfully implement this search you need to be ingesting information
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on process that include the name of the process responsible for the changes from
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your endpoints into the `Endpoint` datamodel in the `Processes` node. In addition,
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confirm the latest CIM App 4.20 or higher is installed and the latest TA for the
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endpoint product.
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known_false_positives: network admin may modify this firewall feature that may cause
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this rule to be triggered.
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references:
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- https://community.fortinet.com:443/t5/FortiEDR/How-FortiEDR-detects-and-blocks-Revil-Ransomware-aka-sodinokibi/ta-p/189638?externalID=FD52469
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- https://app.any.run/tasks/c0f98850-af65-4352-9746-fbebadee4f05/
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tags:
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analytic_story:
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- Ransomware
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- Revil Ransomware
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asset_type: Endpoint
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confidence: 50
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impact: 50
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message: ''
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mitre_attack_id:
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- T1562.007
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- T1562
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observable:
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- name: user
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type: User
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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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risk_score: 25.0
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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/malware/ransomware_ttp/data2/windows-sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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