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https://github.com/splunk/security_content
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mhaag-spl
68 lines
2.3 KiB
YAML
68 lines
2.3 KiB
YAML
name: Powershell Remove Windows Defender Directory
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id: adf47620-79fa-11ec-b248-acde48001122
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version: 3
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date: '2022-05-02'
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author: Teoderick Contreras, Splunk
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type: TTP
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datamodel:
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- Endpoint
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description: This analytic will identify a suspicious PowerShell command used to delete
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the Windows Defender folder. This technique was seen used by the WhisperGate malware
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campaign where it used Nirsofts advancedrun.exe to gain administrative privileges
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to then execute a PowerShell command to delete the Windows Defender folder. This
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is a good indicator the offending process is trying corrupt a Windows Defender installation.
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search: '`powershell` EventCode=4104 ScriptBlockText = "*rmdir *" AND ScriptBlockText = "*\\Microsoft\\Windows Defender*" | stats count min(_time) as firstTime max(_time) as lastTime by Opcode Computer UserID EventCode ScriptBlockText | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `powershell_remove_windows_defender_directory_filter` '
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how_to_implement: To successfully implement this analytic, you will need to enable
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PowerShell Script Block Logging on some or all endpoints. Additional setup here
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https://docs.splunk.com/Documentation/UBA/5.0.4.1/GetDataIn/AddPowerShell#Configure_module_logging_for_PowerShell.
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known_false_positives: unknown
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references:
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- https://www.microsoft.com/security/blog/2022/01/15/destructive-malware-targeting-ukrainian-organizations/
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tags:
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analytic_story:
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- WhisperGate
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automated_detection_testing: passed
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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: 90
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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/T1059.001/powershell_script_block_logging/sbl_xml.log
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impact: 100
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kill_chain_phases:
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- Exploitation
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message: suspicious powershell script $ScriptBlockText$ was executed on the $Computer$
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mitre_attack_id:
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- T1562.001
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- T1562
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nist:
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- DE.CM
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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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- name: UserID
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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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required_fields:
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- _time
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- ScriptBlockText
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- Opcode
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- Computer
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- UserID
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- EventCode
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risk_score: 90
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security_domain: endpoint
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asset_type: Endpoint
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