The SIEM app is now a part of the Elastic Security solution. Click here to view the current documentation.
IMPORTANT: No additional bug fixes or documentation updates will be released for this version.

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Tor Activity to the Internet

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Tor Activity to the Internet

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Detects network events that may indicate the use of Tor traffic to the Internet. Tor is a network protocol that sends traffic through a series of encrypted tunnels used to conceal a user’s location and usage. Tor may be used by threat actors as an alternate communication pathway to conceal the actor’s identity and avoid detection.

Rule type: query

Rule indices:

filebeat-*

Severity: medium

Risk score: 47

Runs every: 5 minutes

Searches indices from: now-6m (Date Math format, see also Additional look-back time)

Maximum signals per execution: 100

Tags:

Elastic
Network

Version: 3 (version history)

Added (Elastic Stack release): 7.6.0

Last modified (Elastic Stack release): 7.7.0

Potential false positives

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Tor client activity is uncommon in managed enterprise networks but may be common in unmanaged or public networks where few security policies apply. Because these ports are in the ephemeral range, this rule may false under certain conditions such as when a NATed web server replies to a client which has used one of these ports by coincidence. In this case, such servers can be excluded if desired.

Rule query

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network.transport:tcp and destination.port:(9001 or 9030) and
source.ip:(10.0.0.0/8 or 172.16.0.0/12 or 192.168.0.0/16) and not
destination.ip:(10.0.0.0/8 or 127.0.0.0/8 or 172.16.0.0/12 or
192.168.0.0/16 or "::1")

Threat mapping

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Framework: MITRE ATT&CK^TM

Tactic:
- Name: Command and Control
- ID: TA0011
- Reference URL: https://attack.mitre.org/tactics/TA0011/
Technique:
- Name: Commonly Used Port
- ID: T1043
- Reference URL: https://attack.mitre.org/techniques/T1043/
Tactic:
- Name: Command and Control
- ID: TA0011
- Reference URL: https://attack.mitre.org/tactics/TA0011/
Technique:
- Name: Multi-hop Proxy
- ID: T1188
- Reference URL: https://attack.mitre.org/techniques/T1188/

Rule version history

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Version 3 (7.7.0 release)

Updated query, changed from:

network.transport: tcp and destination.port: (9001 or 9030) and (
network.direction: outbound or ( source.ip: (10.0.0.0/8 or
172.16.0.0/12 or 192.168.0.0/16) and not destination.ip: (10.0.0.0/8
or 172.16.0.0/12 or 192.168.0.0/16) ) )

Version 2 (7.6.1 release)

Removed auditbeat-*, packetbeat-*, and winlogbeat-* from the rule indices.

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