mirror of
https://github.com/splunk/security_content
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Bhavin Patel
80 lines
3.1 KiB
YAML
80 lines
3.1 KiB
YAML
name: Detect Remote Access Software Usage URL
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id: 9296f515-073c-43a5-88ec-eda5a4626654
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version: 2
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date: '2024-05-09'
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author: Steven Dick
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status: production
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type: Anomaly
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description: The following analytic detects the execution of known remote access software
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within the environment. It leverages network logs mapped to the Web data model,
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identifying specific URLs and user agents associated with remote access tools like
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AnyDesk, GoToMyPC, LogMeIn, and TeamViewer. This activity is significant as adversaries
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often use these utilities to maintain unauthorized remote access. If confirmed malicious,
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this could allow attackers to control systems remotely, exfiltrate data, or further
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compromise the network, posing a severe security risk.
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data_source:
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- Palo Alto Network Threat
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search: '| tstats count min(_time) as firstTime max(_time) as lastTime latest(Web.http_method)
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as http_method latest(Web.http_user_agent) as http_user_agent latest(Web.url) as
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url latest(Web.user) as user latest(Web.dest) as dest from datamodel=Web by Web.action
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Web.src Web.category Web.url_domain | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `drop_dm_object_name("Web")` | lookup remote_access_software remote_domain AS
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url_domain OUTPUT isutility, description as signature, comment_reference as desc,
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category | search isutility = True | `detect_remote_access_software_usage_url_filter`'
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how_to_implement: The detection is based on data that originates from network logs.
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These logs must be processed using the appropriate Splunk Technology Add-ons that
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are specific to the network logs. The logs must also be mapped to the `Web` data
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model. Use the Splunk Common Information Model (CIM) to normalize the field names
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and speed up the data modeling process.
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known_false_positives: It is possible that legitimate remote access software is used
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within the environment. Ensure that the lookup is reviewed and updated with any
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additional remote access software that is used within the environment.
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references:
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- https://attack.mitre.org/techniques/T1219/
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- https://thedfirreport.com/2022/08/08/bumblebee-roasts-its-way-to-domain-admin/
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- https://thedfirreport.com/2022/11/28/emotet-strikes-again-lnk-file-leads-to-domain-wide-ransomware/
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tags:
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analytic_story:
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- Insider Threat
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- Command And Control
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- Ransomware
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asset_type: Network
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confidence: 50
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impact: 50
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message: A domain for a known remote access software $url_domain$ was contacted
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by $src$.
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mitre_attack_id:
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- T1219
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observable:
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- name: src
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type: Hostname
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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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- name: url_domain
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type: Hostname
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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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- Web.action
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- Web.src
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- Web.category
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- Web.url_domain
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risk_score: 25
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security_domain: network
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tests:
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- name: True Positive Test
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attack_data:
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- data:
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https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1219/screenconnect/screenconnect_palo.log
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source: screenconnect_palo
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sourcetype: pan:threat
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