mirror of
https://github.com/splunk/security_content
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divious1
118 lines
4.6 KiB
YAML
118 lines
4.6 KiB
YAML
asset_type: Endpoint
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confidence: medium
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creation_date: '2017-04-18'
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data_metadata:
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data_models:
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- Network_Traffic
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data_source:
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- Network Communications
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providing_technologies:
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- Palo Alto Firewall
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- Bro
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- Splunk Stream
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description: This search looks for network traffic on common ports where a higher
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layer protocol does not match the port that is being used. For example, this search
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should identify cases where protocols other than HTTP are running on TCP port 80.
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This can be used by attackers to circumvent firewall restrictions, or as an attempt
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to hide malicious communications over ports and protocols that are typically allowed
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and not well inspected.
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detect:
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splunk:
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correlation_rule:
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notable:
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nes_fields: dest_ip, src_ip
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rule_description: This search looks for network traffic on common ports where
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the underlying protocol does not match the port being used. For example,
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this search should identify cases where protocols other than HTTP are running
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on port 80. This can be used by attackers to circumvent firewall restrictions,
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or as an attempt to hide malicious communications in traffic that is typically
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allowed and not well inspected.
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rule_title: Protocol / Port Mismatch from $src_ip$
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risk:
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risk_object: src_ip
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risk_object_type:
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- system
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risk_score: 40
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schedule:
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cron_schedule: 0 * * * *
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earliest_time: -70m@m
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latest_time: -10m@m
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search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as
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lastTime from datamodel=Network_Traffic where (All_Traffic.app=dns NOT All_Traffic.dest_port=53)
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OR ((All_Traffic.app=web-browsing OR All_Traffic.app=http) NOT (All_Traffic.dest_port=80
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OR All_Traffic.dest_port=8080 OR All_Traffic.dest_port=8000)) OR (All_Traffic.app=ssl
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NOT (All_Traffic.dest_port=443 OR All_Traffic.dest_port=8443)) OR (All_Traffic.app=smtp
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NOT All_Traffic.dest_port=25) by All_Traffic.src_ip, All_Traffic.dest_ip,
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All_Traffic.app, All_Traffic.dest_port |`security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| `drop_dm_object_name("All_Traffic")`'
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suppress:
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suppress_fields: dest_ip, dest_port
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suppress_period: 86400s
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eli5: This search looks for instances in which the protocol observed is not consistent
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with the port and transport protocol typically used for that protocol. For example,
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looking for network traffic other than HTTP running over TCP port 80. Such behavior
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could indicate a misconfiguration or a custom command and control protocol that
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has been designed to look like ordinary web traffic. The search will also identify
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if HTTP traffic is observed running on unexpected ports. This can be common in many
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environments.
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entities:
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- src_ip
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how_to_implement: Running this search properly requires a technology that can inspect
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network traffic and identify common protocols. Technologies such as Bro and Palo
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Alto Networks firewalls are two examples that will identify protocols via inspection,
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and not just assume a specific protocol based on the transport protocol and ports.
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id: 54dc1265-2f74-4b6d-b30d-49eb506a31b3
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investigations:
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- id: 9925d08f-561e-4faa-8912-e3888a842341
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name: Get Process Information For Port Activity
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type: splunk
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- id: bc91a8cf-35e7-4bb2-8140-e756cc06fd76
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name: Get Authentication Logs For Endpoint
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type: splunk
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- id: fdcfb369-1725-4c24-824a-22972d7f0d55
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name: Get Risk Modifiers For User
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type: splunk
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- id: bc91a8cf-35e7-4bb2-8140-e756cc06fd71
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name: Get Process Info
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type: splunk
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- id: 3d6c3213-5fff-4a1e-b57d-b24c262171e7
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name: Get Notable History
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type: splunk
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- id: f3fb4d1b-5f33-4b01-b541-c7af9534c242
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name: Get Notable Info
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type: splunk
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- id: fdcfb369-1725-4c24-824a-22972d7f0d65
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name: Get Risk Modifiers For Endpoint
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type: splunk
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- id: bc91a8cf-35e7-4bb2-8140-e756cc06fd74
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name: Get User Information from Identity Table
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type: splunk
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known_false_positives: None identified
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maintainers:
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- company: Splunk
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email: rvaldez@splunk.com
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name: Rico Valdez
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mappings:
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cis20:
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- CIS 9
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- CIS 12
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kill_chain_phases:
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- Command and Control
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mitre_attack:
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- Command and Control
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- Commonly Used Port
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nist:
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- DE.AE
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- PR.AC
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modification_date: '2017-09-11'
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name: Protocol or Port Mismatch
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original_authors:
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- company: Splunk
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email: rvaldez@splunk.com
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name: Rico Valdez
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references: []
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security_domain: network
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spec_version: 2
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type: splunk
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version: '1.0'
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