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P4T12ICK
56 lines
1.9 KiB
YAML
56 lines
1.9 KiB
YAML
name: Disable AMSI Through Registry
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id: 9c27ec42-d338-11eb-9044-acde48001122
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version: 2
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date: '2022-01-26'
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author: Teoderick Contreras, Splunk
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status: production
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type: TTP
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description: this search is to identify modification in registry to disable AMSI windows
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feature to evade detections. This technique was seen in several ransomware, RAT
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and even APT to impaire defenses of the compromise machine and to be able to execute
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payload with minimal alert as much as possible.
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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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Details: '0x00000000'
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TargetObject: '*\\SOFTWARE\\Microsoft\\Windows Script\\Settings\\AmsiEnable'
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condition: selection1
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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: network operator may disable this feature of windows but not
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so common.
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references:
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- https://blog.f-secure.com/hunting-for-amsi-bypasses/
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- https://gist.github.com/rxwx/8955e5abf18dc258fd6b43a3a7f4dbf9
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tags:
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analytic_story:
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- Ransomware
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- Windows Registry Abuse
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asset_type: Endpoint
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confidence: 50
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impact: 50
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message: Disable AMSI Through Registry
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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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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: 25.0
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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/ransomware_ttp/data2/windows-sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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