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 Command And Control Web Protocols Command And Control Splunk Enterprise Splunk Enterprise Security Splunk Cloud Network_Traffic

⚠️ WARNING THIS IS A EXPERIMENTAL DETECTION

We have not been able to test, simulate, or build datasets for this detection. 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

ATT&CK

ID	Technique	Tactic
T1071	Application Layer Protocol	Command And Control

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

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`

Associated Analytic Story

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

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.

Required field

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

Kill Chain Phase

• Command and Control

Known False Positives

None at this time

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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