mirror of
https://github.com/splunk/security_content
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Eric McGinnis
61 lines
2.3 KiB
YAML
61 lines
2.3 KiB
YAML
name: Delete A Net User
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id: 8776d79c-d26e-11eb-9a56-acde48001122
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version: 8
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date: '2022-03-17'
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author: Teoderick Contreras, Splunk
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status: production
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type: Anomaly
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description: This analytic will detect a suspicious net.exe/net1.exe command-line
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to delete a user on a system. This technique may be use by an administrator for
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legitimate purposes, however this behavior has been used in the wild to impair some
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user or deleting adversaries tracks created during its lateral movement additional
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systems. During triage, review parallel processes for additional behavior. Identify
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any other user accounts created before or after.
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data_source:
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- Windows Security 4688
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search:
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selection1:
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process.cmd_line|contains: user
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selection2:
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process.cmd_line|contains: /delete
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selection3:
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process.file.name:
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- net.exe
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- net1.exe
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condition: selection1 and selection2 and (selection3)
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how_to_implement: To successfully implement this search, you need to be ingesting
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logs with the process name, parent process, and command-line executions 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. Tune and filter known instances where renamed net.exe may be used.
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known_false_positives: System administrators or scripts may delete user accounts via
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this technique. Filter as needed.
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references:
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- https://thedfirreport.com/2020/04/20/sqlserver-or-the-miner-in-the-basement/
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tags:
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analytic_story:
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- XMRig
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- Ransomware
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asset_type: Endpoint
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confidence: 70
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impact: 70
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message: An instance of $parent_process_name$ spawning $process_name$ was identified
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on endpoint $dest_device_id$ by user $dest_user_id$ attempting to delete a user
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account.
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mitre_attack_id:
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- T1531
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observable: []
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product:
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- Splunk Behavioral Analytics
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required_fields: []
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kill_chain_phases:
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- Exploitation
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risk_score: 49
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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/ssa_data1/net_user_del.log
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source: WinEventLog:Security
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- data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1531/atomic_red_team/security.log
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source: WinEventLog:Security
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