mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Gowthamaraj rajendran
77 lines
3.2 KiB
YAML
77 lines
3.2 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: '2023-06-06'
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author: Teoderick Contreras, Splunk
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status: production
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type: TTP
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description: This analytic identifies instances where an adversary modifies the security
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permissions of a particular file or directory. This technique is frequently observed
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in the tradecraft of Advanced Persistent Threats (APTs) and coinminer scripts. The
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purpose of this behavior is to actively evade detection and impede access to their
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associated files. By identifying these security permission changes, we can enhance
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our ability to detect and respond to potential threats, mitigating the impact of
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malicious activities on the system.
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data_source:
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- Sysmon Event ID 1
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search: '| tstats `security_content_summariesonly` min(_time) as firstTime max(_time)
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as lastTime from datamodel=Endpoint.Processes where Processes.process_name IN( "icacls.exe",
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"cacls.exe", "xcacls.exe") AND Processes.process IN ("*/deny*", "*/D*") by Processes.parent_process_name
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Processes.parent_process Processes.process_name Processes.process Processes.process_guid
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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: The detection is based on data that originates from Endpoint Detection
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and Response (EDR) agents. These agents are designed to provide security-related
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telemetry from the endpoints where the agent is installed. To implement this search,
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you must ingest logs that contain the process GUID, process name, and parent process.
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Additionally, you must ingest complete command-line executions. These logs must
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be processed using the appropriate Splunk Technology Add-ons that are specific to
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the EDR product. The logs must also be mapped to the `Processes` node of the `Endpoint`
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data model. Use the Splunk Common Information Model (CIM) to normalize the field
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names and speed up the data modeling process.
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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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- Sandworm Tools
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asset_type: Endpoint
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confidence: 80
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impact: 90
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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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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/xmrig_miner/windows-sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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