Potential Network Sweep Detected

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This rule identifies a potential network sweep. A network sweep is a method used by attackers to scan a target network, identifying active hosts, open ports, and available services to gather information on vulnerabilities and weaknesses. This reconnaissance helps them plan subsequent attacks and exploit potential entry points for unauthorized access, data theft, or other malicious activities. This rule proposes threshold logic to check for connection attempts from one source host to 10 or more destination hosts on commonly used network services.

Rule type: threshold

Rule indices:

  • packetbeat-*
  • auditbeat-*
  • filebeat-*
  • logs-network_traffic.*
  • logs-endpoint.events.network-*

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

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destination.port : (21 or 22 or 23 or 25 or 139 or 445 or 3389 or 5985 or 5986) and
source.ip : (10.0.0.0/8 or 172.16.0.0/12 or 192.168.0.0/16)

Framework: MITRE ATT&CKTM