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P4T12ICK
60 lines
1.9 KiB
YAML
60 lines
1.9 KiB
YAML
name: Disable Defender BlockAtFirstSeen Feature
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id: 2dd719ac-3021-11ec-97b4-acde48001122
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version: 2
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date: '2022-01-26'
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author: Teoderick Contreras
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status: production
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type: TTP
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description: This analytic is intended to detect a suspicious modification of the
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Windows registry to disable a Windows Defender feature. This technique is intended
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to bypass or evade detection from Windows Defender AV, specifically the BlockAtFirstSeen
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feature where it blocks suspicious files the first time seen on the host.
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data_source:
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- Sysmon Event ID 13
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search:
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selection1:
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Registry.registry_value_name: DisableBlockAtFirstSeen
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TargetObject: '*\\Microsoft\\Windows Defender\\SpyNet*'
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Details: '0x00000001'
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condition: selection1
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how_to_implement: To successfully implement this search, you need to be ingesting
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logs with the registry value name, registry path, and registry value data from your
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endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the
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Sysmon TA.
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known_false_positives: admin or user may choose to disable windows defender product
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references:
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- https://thedfirreport.com/2021/10/18/icedid-to-xinglocker-ransomware-in-24-hours/
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tags:
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analytic_story:
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- IcedID
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- Windows Registry Abuse
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- Azorult
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asset_type: Endpoint
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confidence: 70
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impact: 70
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message: modified/added/deleted registry entry $registry_path$ in $dest$
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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: dest
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type: Hostname
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role:
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- Victim
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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: 49
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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/icedid/disable_av/sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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