splunk-security_content/docs/_posts/2020-07-22-tor_traffic.md

title, excerpt, categories, last_modified_at, toc, toc_label, tags

title	excerpt	categories	last_modified_at	toc	toc_label	tags
TOR Traffic	Application Layer Protocol , Web Protocols	Network	2020-07-22	true		Application Layer Protocol Web Protocols Command And Control Command And Control Splunk Enterprise Splunk Enterprise Security Splunk Cloud Network_Traffic

⚠️ WARNING THIS IS A EXPERIMENTAL analytic

We have not been able to test, simulate, or build datasets for this object. Use at your own risk. This analytic is NOT supported.

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Description

This search looks for network traffic identified as The Onion Router (TOR), a benign anonymity network which can be abused for a variety of nefarious purposes.

• Type: TTP
• Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
• Datamodel: Network_Traffic
• Last Updated: 2020-07-22
• Author: David Dorsey, Splunk
• ID: ea688274-9c06-4473-b951-e4cb7a5d7a45

Annotations

ATT&CK

ID	Technique	Tactic
T1071	Application Layer Protocol	Command And Control

| T1071.001 | Web Protocols | Command And Control |

Kill Chain Phase

• Command & Control

NIST

• DE.AE

CIS20

• CIS 9
• CIS 12

CVE

Search

| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Network_Traffic where All_Traffic.app=tor AND All_Traffic.action=allowed by All_Traffic.src_ip All_Traffic.dest_ip All_Traffic.dest_port All_Traffic.action 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `drop_dm_object_name("All_Traffic")` 
| `tor_traffic_filter`

Macros

The SPL above uses the following Macros:

• security_content_ctime
• security_content_summariesonly

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

Required field

• _time
• All_Traffic.app
• All_Traffic.action
• All_Traffic.src_ip
• All_Traffic.dest_ip
• All_Traffic.dest_port

How To Implement

In order to properly run this search, Splunk needs to ingest data from firewalls or other network control devices that mediate the traffic allowed into an environment. This is necessary so that the search can identify an 'action' taken on the traffic of interest. The search requires the Network_Traffic data model be populated.

Known False Positives

None at this time

Associated Analytic story

• Prohibited Traffic Allowed or Protocol Mismatch
• Ransomware
• NOBELIUM Group
• Command and Control

RBA

Risk Score	Impact	Confidence	Message
25.0	50	50	tbd

ℹ️ 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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