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66 lines
2.3 KiB
YAML
66 lines
2.3 KiB
YAML
name: Disable Defender BlockAtFirstSeen Feature
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id: 2dd719ac-3021-11ec-97b4-acde48001122
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version: 1
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date: '2021-10-18'
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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 to detect a suspicious modification of registry to disable
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windows defender feature. This technique is to bypassed or evade detection from
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Windows Defender AV product specially the BlockAtFirstSeen feature where it block
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suspicious file first seen in the host.
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search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
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as lastTime from datamodel=Endpoint.Registry where Registry.registry_path = "*\\Microsoft\\Windows
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Defender\\SpyNet*" Registry.registry_value_name = DisableBlockAtFirstSeen Registry.registry_value_data
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= 0x00000001 by Registry.dest Registry.user Registry.registry_path Registry.registry_value_name
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Registry.registry_value_data | `drop_dm_object_name(Registry)` | `security_content_ctime(lastTime)`
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| `security_content_ctime(firstTime)` | `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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- IceID
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automated_detection_testing: passed
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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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