Potential Network Scan Detected
editPotential Network Scan Detected
editThis rule identifies a potential port scan. A port scan is a method utilized by attackers to systematically scan a target system or network for open ports, allowing them to identify available services and potential vulnerabilities. By mapping out the open ports, attackers can gather critical information to plan and execute targeted attacks, gaining unauthorized access, compromising security, and potentially leading to data breaches, unauthorized control, or further exploitation of the targeted system or network. This rule proposes threshold logic to check for connection attempts from one source host to 20 or more destination ports.
Rule type: threshold
Rule indices:
- logs-endpoint.events.network-*
- logs-network_traffic.*
- packetbeat-*
- filebeat-*
- auditbeat-*
Severity: low
Risk score: 21
Runs every: 5m
Searches indices from: now-9m (Date Math format, see also Additional look-back time)
Maximum alerts per execution: 5
References: None
Tags:
- Domain: Network
- Tactic: Discovery
- Tactic: Reconnaissance
- Use Case: Network Security Monitoring
Version: 5
Rule authors:
- Elastic
Rule license: Elastic License v2
Rule query
editdestination.port : * and event.action : "network_flow" and source.ip : (10.0.0.0/8 or 172.16.0.0/12 or 192.168.0.0/16)
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Discovery
- ID: TA0007
- Reference URL: https://attack.mitre.org/tactics/TA0007/
-
Technique:
- Name: Network Service Discovery
- ID: T1046
- Reference URL: https://attack.mitre.org/techniques/T1046/
-
Tactic:
- Name: Reconnaissance
- ID: TA0043
- Reference URL: https://attack.mitre.org/tactics/TA0043/
-
Technique:
- Name: Active Scanning
- ID: T1595
- Reference URL: https://attack.mitre.org/techniques/T1595/
-
Sub-technique:
- Name: Scanning IP Blocks
- ID: T1595.001
- Reference URL: https://attack.mitre.org/techniques/T1595/001/