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https://github.com/splunk/security_content
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pyth0n1c
98 lines
4.9 KiB
YAML
98 lines
4.9 KiB
YAML
name: Detect Remote Access Software Usage Process
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id: ffd5e001-2e34-48f4-97a2-26dc4bb08178
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version: 5
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date: '2024-11-13'
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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 data from Endpoint Detection and Response (EDR)
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agents, focusing on process names and parent processes mapped to the Endpoint data
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model. This activity is significant as adversaries often use remote access tools
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like AnyDesk, GoToMyPC, LogMeIn, and TeamViewer to maintain unauthorized access.
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If confirmed malicious, this could allow attackers to control systems remotely,
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exfiltrate data, or deploy additional malware, posing a severe threat to the organization's
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security.
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data_source:
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- Sysmon EventID 1
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- Windows Event Log Security 4688
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- CrowdStrike ProcessRollup2
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search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
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as lastTime values(Processes.parent_process) as parent_process from datamodel=Endpoint.Processes
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where Processes.dest!=unknown Processes.process!=unknown by Processes.dest Processes.user
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Processes.process_name Processes.process | `security_content_ctime(firstTime)` |
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`security_content_ctime(lastTime)` | `drop_dm_object_name(Processes)` | lookup remote_access_software
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remote_utility AS process_name OUTPUT isutility, description as signature, comment_reference
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as desc, category | search isutility = True | `remote_access_software_usage_exceptions`
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| `detect_remote_access_software_usage_process_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. The "exceptions" macro leverages both
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an Assets and Identities lookup, as well as a KVStore collection called "remote_software_exceptions"
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that lets you track and maintain device- based exceptions for this set of detections.
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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. Known false
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positives can be added to the remote_access_software_usage_exception.csv lookup
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to globally suppress these situations across all remote access content
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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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drilldown_searches:
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- name: View the detection results for - "$dest$" and "$user$"
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search: '%original_detection_search% | search dest = "$dest$" user = "$user$"'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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- name: View risk events for the last 7 days for - "$dest$" and "$user$"
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search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$",
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"$user$") starthoursago=168 | stats count min(_time) as firstTime max(_time)
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as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk
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Message" values(analyticstories) as "Analytic Stories" values(annotations._all)
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as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics"
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by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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rba:
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message: A process for a known remote access software $process_name$ was identified
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on $dest$.
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risk_objects:
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- field: dest
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type: system
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score: 25
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- field: user
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type: user
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score: 25
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threat_objects:
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- field: process_name
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type: process_name
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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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- Gozi Malware
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- CISA AA24-241A
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asset_type: Endpoint
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mitre_attack_id:
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- T1219
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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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security_domain: endpoint
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manual_test: This detection uses A&I lookups from Enterprise Security.
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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_sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: XmlWinEventLog
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