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tccontre
83 lines
2.7 KiB
YAML
83 lines
2.7 KiB
YAML
name: Excessive Usage Of Net App
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id: 45e52536-ae42-11eb-b5c6-acde48001122
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version: 2
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date: '2021-05-06'
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author: Teoderick Contreras, Splunk
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type: Anomaly
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datamodel:
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- Endpoint
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description: This analytic identifies excessive usage of `net.exe` or `net1.exe` within
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a bucket of time (1 minute). This behavior was seen in a Monero incident where the
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adversary attempts to create many users, delete and disable users as part of its
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malicious behavior.
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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 `process_net` by Processes.process_name
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Processes.parent_process_name Processes.original_file_name Processes.dest Processes.user
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_time span=1m | where count >=10 | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `excessive_usage_of_net_app_filter`'
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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: unknown. Filter as needed. Modify the time span 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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- Azorult
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- Windows Post-Exploitation
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- Prestige Ransomware
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confidence: 70
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context:
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- Source:Endpoint
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- Scope:Local
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- Stage:Execution
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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: 40
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kill_chain_phases:
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- Exploitation
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message: Excessive usage of net1.exe or net.exe within 1m, with command line $process$
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has been detected on $dest$ by $user$
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mitre_attack_id:
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- T1531
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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: dest
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type: Endpoint
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role:
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- Victim
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- name: process_name
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type: Process
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role:
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- Attacker
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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.dest
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- Processes.user
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- Processes.parent_process_name
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- Processes.parent_process
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- Processes.original_file_name
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- Processes.process_name
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- Processes.process
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- Processes.process_id
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- Processes.parent_process_path
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- Processes.process_path
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- Processes.parent_process_id
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risk_score: 28
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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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