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patel-bhavin
93 lines
3.5 KiB
YAML
93 lines
3.5 KiB
YAML
name: Delete A Net User
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id: 8776d79c-d26e-11eb-9a56-acde48001122
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version: 4
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date: '2022-03-17'
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author: Teoderick Contreras, Splunk
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type: Anomaly
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datamodel:
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- Endpoint_Processes
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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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search: '| from read_ssa_enriched_events()
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| eval timestamp=parse_long(ucast(map_get(input_event, "_time"), "string", null)),
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process=lower(ucast(map_get(input_event, "process"), "string", null)),
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process_name=lower(ucast(map_get(input_event, "process_name"), "string", null)),
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process_path=ucast(map_get(input_event, "process_path"), "string",null),
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parent_process_name=ucast(map_get(input_event, "parent_process_name"), "string",null),
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event_id=ucast(map_get(input_event, "event_id"), "string", null)
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| where process IS NOT NULL AND like(process, "%/delete%") AND like(process, "%user%") AND (process_name="net1.exe" OR process_name="net.exe")
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| eval start_time=timestamp, end_time=timestamp, entities=mvappend(ucast(map_get(input_event,
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"dest_user_id"), "string", null), ucast(map_get(input_event, "dest_device_id"),
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"string", null)), body=create_map(["event_id", event_id, "process", process, "process_name",
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process_name, "parent_process_name", parent_process_name, "process_path", process_path])
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| into write_ssa_detected_events();'
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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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cis20:
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- CIS 4
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- CIS 16
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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/ransomware_ttp/ssa_data1/net_user_del.log
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1531/atomic_red_team/security.log
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impact: 70
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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 $dest_device_id$ 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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nist:
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- PR.AC
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- PR.IP
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observable:
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- name: dest_user_id
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type: User
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role:
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- Victim
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- name: dest_device_id
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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 Behavioral Analytics
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required_fields:
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- _time
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- dest_device_id
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- process_name
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- parent_process_name
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- process_path
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- dest_user_id
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- process
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- cmd_line
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risk_score: 49
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risk_severity: low
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security_domain: endpoint
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asset_type: Endpoint
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