mirror of
https://github.com/splunk/security_content
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Lou Stella
75 lines
3.0 KiB
YAML
75 lines
3.0 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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type: TTP
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datamodel:
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- Endpoint
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description: This analytic is intended to detect a suspicious modification of the Windows registry to disable
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a Windows Defender feature. This technique is intended to bypass or evade detection from
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Windows Defender AV, specifically the BlockAtFirstSeen feature where it blocks
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suspicious files the first time seen on the host.
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search: '| tstats `security_content_summariesonly` count from datamodel=Endpoint.Registry
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where Registry.registry_path = "*\\Microsoft\\Windows Defender\\SpyNet*" Registry.registry_value_name
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= DisableBlockAtFirstSeen Registry.registry_value_data = 0x00000001 by _time span=1h
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Registry.dest Registry.user Registry.registry_path Registry.registry_value_name
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Registry.registry_value_data Registry.process_guid | `drop_dm_object_name(Registry)`
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|rename process_guid as proc_guid |join proc_guid, _time [| tstats `security_content_summariesonly`
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count FROM datamodel=Endpoint.Processes by _time span=1h Processes.process_id Processes.process_name
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Processes.process Processes.dest Processes.parent_process_name Processes.parent_process
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Processes.process_guid | `drop_dm_object_name(Processes)` |rename process_guid as
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proc_guid | fields _time dest user parent_process_name parent_process process_name
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process_path process proc_guid registry_path registry_value_name registry_value_data]
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| table _time dest user parent_process_name parent_process process_name process_path
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process proc_guid registry_path registry_value_name registry_value_data | `disable_defender_blockatfirstseen_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 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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confidence: 70
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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/malware/icedid/disable_av/sysmon.log
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impact: 70
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kill_chain_phases:
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- Exploitation
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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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required_fields:
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- _time
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- Registry.dest
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- Registry.user
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- Registry.registry_value_name
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- Registry.registry_key_name
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- Registry.registry_path
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- Registry.registry_value_data
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risk_score: 49
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security_domain: endpoint
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asset_type: Endpoint
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