mirror of
https://github.com/splunk/security_content
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Bhavin Patel
70 lines
2.6 KiB
YAML
70 lines
2.6 KiB
YAML
name: Powershell Windows Defender Exclusion Commands
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id: 907ac95c-4dd9-11ec-ba2c-acde48001122
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version: 1
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date: '2021-11-25'
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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 detect a suspicious process commandline related to
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windows defender exclusion feature. This command is abused by adversaries, malware
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author and red teams to bypassed Windows Defender Anti-Virus product by excluding folder
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path, file path, process, extensions and etc. from its real time or schedule scan
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to execute their malicious code. This is a good indicator for defense evasion and
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to look further for events after this behavior.
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search: '`powershell` EventCode=4104 (Message = "*Add-MpPreference *" OR Message =
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"*Set-MpPreference *") AND Message = "*-exclusion*" | stats count min(_time) as
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firstTime max(_time) as lastTime by EventCode Message ComputerName User | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `powershell_windows_defender_exclusion_commands_filter`'
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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 `Registry` node. Also make sure
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that this registry was included in your config files ex. sysmon config to be monitored.
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known_false_positives: admin or user may choose to use this windows features.
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references:
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- https://tccontre.blogspot.com/2020/01/remcos-rat-evading-windows-defender-av.html
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- https://app.any.run/tasks/cf1245de-06a7-4366-8209-8e3006f2bfe5/
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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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- Remcos
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- Windows Defense Evasion Tactics
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- WhisperGate
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- CISA AA22-320A
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- AgentTesla
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confidence: 80
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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/T1562.001/defender_exclusion_powershell/powershell.log
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impact: 80
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kill_chain_phases:
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- Exploitation
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message: exclusion command $Message$ executed on $ComputerName$
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mitre_attack_id:
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- T1562.001
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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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- name: ComputerName
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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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- Message
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- ComputerName
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- User
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risk_score: 64
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security_domain: endpoint
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asset_type: Endpoint
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