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P4T12ICK
85 lines
3.0 KiB
YAML
85 lines
3.0 KiB
YAML
name: Windows DISM Remove Defender
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id: 8567da9e-47f0-11ec-99a9-acde48001122
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version: 1
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date: '2021-11-17'
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author: Michael Haag, Splunk
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type: TTP
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datamodel:
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- Endpoint
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description: The following analytic identifies the use of the Windows Disk Image Utility,
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`dism.exe`, to remove Windows Defender. Adversaries may use `dism.exe` to disable
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Defender before completing their objective.
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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.Processes where Processes.process_name=dism.exe
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(Processes.process="*/online*" AND Processes.process="*/disable-feature*" AND Processes.process="*Windows-Defender*"
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AND Processes.process="*/remove*") by Processes.dest Processes.user Processes.parent_process_name
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Processes.process_name Processes.original_file_name Processes.process Processes.process_id
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Processes.parent_process_id | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `windows_dism_remove_defender_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 `Processes` node. In addition,
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confirm the latest CIM App 4.20 or higher is installed and the latest TA for the
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endpoint product.
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known_false_positives: Some legitimate administrative tools leverage `dism.exe` to
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manipulate packages and features of the operating system. Filter as needed.
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references:
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- https://thedfirreport.com/2020/11/23/pysa-mespinoza-ransomware/
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tags:
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analytic_story:
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- Windows Defense Evasion Tactics
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automated_detection_testing: passed
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confidence: 100
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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/atomic_red_team/windows-sysmon_dism.log
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impact: 80
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kill_chain_phases:
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- Exploitation
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message: An instance of $parent_process_name$ spawning $process_name$ was identified
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on endpoint $dest$ by user $user$ attempting to disable Windows Defender.
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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: dest
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type: Hostname
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role:
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- Victim
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- name: parent_process_name
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type: Process
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role:
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- Parent Process
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- name: process_name
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type: Process
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role:
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- Child Process
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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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- Processes.dest
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- Processes.user
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- Processes.parent_process_name
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- Processes.parent_process
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- Processes.original_file_name
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- Processes.process_name
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- Processes.process
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- Processes.process_id
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- Processes.parent_process_path
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- Processes.process_path
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- Processes.parent_process_id
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risk_score: 80
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security_domain: access
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supported_tas:
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- Splunk_TA_microsoft_sysmon
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asset_type: Endpoint
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