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https://github.com/splunk/security_content
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Michael Haag
77 lines
2.9 KiB
YAML
77 lines
2.9 KiB
YAML
name: Windows Mimikatz Binary Execution
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id: a9e0d6d3-9676-4e26-994d-4e0406bb4467
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version: 1
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date: '2022-11-16'
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author: Michael Haag, Splunk
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status: production
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type: TTP
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description: As simple as it sounds, this analytic identifies when the native mimikatz.exe
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binary executes on Windows. It does look for the original file name as well, just
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in case the binary is renamed. Adversaries sometimes bring in the default binary
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and run it directly. Benjamin Delpy originally created Mimikatz as a proof of concept
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to show Microsoft that its authentication protocols were vulnerable to an attack.
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Instead, he inadvertently created one of the most widely used and downloaded threat
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actor tools of the past 20 years. Mimikatz is an open-source application that allows
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users to view and save authentication credentials such as Kerberos tickets.
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data_source:
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- Sysmon Event ID 1
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search:
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selection1:
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OriginalFileName: mimikatz.exe
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selection2:
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Image|endswith: mimikatz.exe
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condition: (selection1 or selection2)
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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: False positives should be limited as this is directly looking
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for Mimikatz, the credential dumping utility.
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references:
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- https://www.cisa.gov/uscert/sites/default/files/publications/aa22-320a_joint_csa_iranian_government-sponsored_apt_actors_compromise_federal%20network_deploy_crypto%20miner_credential_harvester.pdf
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- https://www.varonis.com/blog/what-is-mimikatz
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- https://media.defense.gov/2023/May/24/2003229517/-1/-1/0/CSA_Living_off_the_Land.PDF
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tags:
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analytic_story:
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- Credential Dumping
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- CISA AA22-320A
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- Volt Typhoon
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asset_type: Endpoint
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confidence: 100
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impact: 100
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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 dump credentials.
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mitre_attack_id:
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- T1003
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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: Computer
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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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risk_score: 100
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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/attack_techniques/T1003/credential_extraction/mimikatzwindows-sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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update_timestamp: true
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