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tccontre
71 lines
2.5 KiB
YAML
71 lines
2.5 KiB
YAML
name: Icacls Deny Command
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id: cf8d753e-a8fe-11eb-8f58-acde48001122
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version: 1
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date: '2021-04-29'
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author: Teoderick Contreras, Splunk
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type: TTP
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datamodel:
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- Endpoint
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description: This analytic identifies a potential adversary that changes the security
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permission of a specific file or directory. This technique is commonly seen in APT
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tradecraft or coinminer scripts. This behavior is meant to evade detection and prevent
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access to their component files.
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search: '| tstats `security_content_summariesonly` values(Processes.process) as process
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values(Processes.process_id) as process_id count min(_time) as firstTime max(_time)
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as lastTime from datamodel=Endpoint.Processes where Processes.process_name = "icacls.exe"
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OR Processes.process_name = "cacls.exe" OR Processes.process_name = "xcacls.exe"
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AND Processes.process = "*/deny*" by Processes.parent_process_name Processes.process_name
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Processes.dest Processes.user | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `icacls_deny_command_filter`'
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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 icacls.exe may be used.
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known_false_positives: Unknown. It is possible some administrative scripts use ICacls.
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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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- Azorult
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confidence: 80
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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/xmrig_miner/windows-sysmon.log
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impact: 90
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kill_chain_phases:
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- Exploitation
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message: Process name $process_name$ with deny argument executed by $user$ to change
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security permission of a specific file or directory on host $dest$
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mitre_attack_id:
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- T1222
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observable:
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- name: dest
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type: Endpoint
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role:
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- Victim
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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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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.parent_process_name
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- Processes.process_name
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- Processes.dest
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- Processes.user
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- Processes.process_id
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- Processes.process
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risk_score: 72
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security_domain: endpoint
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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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