IMPORTANT: No additional bug fixes or documentation updates
will be released for this version. For the latest information, see the
current release documentation.
Potential Non-Standard Port HTTP/HTTPS connection
editPotential Non-Standard Port HTTP/HTTPS connection
editIdentifies potentially malicious processes communicating via a port paring typically not associated with HTTP/HTTPS. For example, HTTP over port 8443 or port 440 as opposed to the traditional port 80 , 443. Adversaries may make changes to the standard port a protocol uses to bypass filtering or muddle analysis/parsing of network data.
Rule type: eql
Rule indices:
- logs-endpoint.events.*
Severity: low
Risk score: 21
Runs every: 60m
Searches indices from: now-119m (Date Math format, see also Additional look-back time)
Maximum alerts per execution: 100
References: None
Tags:
- Domain: Endpoint
- OS: Linux
- OS: macOS
- Use Case: Threat Detection
- Tactic: Command and Control
- Rule Type: BBR
- Data Source: Elastic Defend
Version: 2
Rule authors:
- Elastic
Rule license: Elastic License v2
Rule query
editnetwork where process.name : ("http", "https")
and destination.port not in (80, 443)
and event.action in ("connection_attempted", "connection_accepted")
and destination.ip != "127.0.0.1"
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Command and Control
- ID: TA0011
- Reference URL: https://attack.mitre.org/tactics/TA0011/
-
Technique:
- Name: Non-Standard Port
- ID: T1571
- Reference URL: https://attack.mitre.org/techniques/T1571/
-
Technique:
- Name: Application Layer Protocol
- ID: T1071
- Reference URL: https://attack.mitre.org/techniques/T1071/
-
Sub-technique:
- Name: Web Protocols
- ID: T1071.001
- Reference URL: https://attack.mitre.org/techniques/T1071/001/
-
Technique:
- Name: Encrypted Channel
- ID: T1573
- Reference URL: https://attack.mitre.org/techniques/T1573/
-
Sub-technique:
- Name: Symmetric Cryptography
- ID: T1573.001
- Reference URL: https://attack.mitre.org/techniques/T1573/001/
-
Sub-technique:
- Name: Asymmetric Cryptography
- ID: T1573.002
- Reference URL: https://attack.mitre.org/techniques/T1573/002/