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Description

The following analytic detects when a known remote access software is executed with the environment. Adversaries use these utilities to retain remote access capabilities to the environment. Utilities in the lookup include AnyDesk, GoToMyPC, LogMeIn, TeamViewer and much more. Review the lookup for the entire list and add any others.

  • Type: Anomaly
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
  • Datamodel: Web
  • Last Updated: 2024-02-22
  • Author: Steven Dick
  • ID: 9296f515-073c-43a5-88ec-eda5a4626654

Annotations

ATT&CK

ATT&CK

ID Technique Tactic
T1219 Remote Access Software Command And Control
Kill Chain Phase
  • Command and Control
NIST
  • DE.AE
CIS20
  • CIS 13
CVE 


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| tstats count min(_time) as firstTime max(_time) as lastTime latest(Web.http_method) as http_method latest(Web.http_user_agent) as http_user_agent latest(Web.url) as url latest(Web.user) as user latest(Web.dest) as dest from datamodel=Web by Web.action Web.src Web.category Web.url_domain 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `drop_dm_object_name("Web")` 
| lookup remote_access_software remote_domain AS url_domain OUTPUT isutility, description as signature, comment_reference as desc, category 
| search isutility = True 
| `detect_remote_access_software_usage_url_filter`

Macros

The SPL above uses the following Macros:

:information_source: detect_remote_access_software_usage_url_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Lookups

The SPL above uses the following Lookups:

Required fields

List of fields required to use this analytic.

  • _time
  • Web.action
  • Web.src
  • Web.category
  • Web.url_domain

How To Implement

The detection is based on data that originates from network logs. These logs must be processed using the appropriate Splunk Technology Add-ons that are specific to the network logs. The logs must also be mapped to the Web data model. Use the Splunk Common Information Model (CIM) to normalize the field names and speed up the data modeling process.

Known False Positives

It is possible that legitimate remote access software is used within the environment. Ensure that the lookup is reviewed and updated with any additional remote access software that is used within the environment.

Associated Analytic Story

RBA

Risk Score Impact Confidence Message
25.0 50 50 A domain for a known remote access software $url_domain$ was contacted by $src$.

:information_source: The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.

Reference

Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

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