SigmaHQ/rules/network/net_susp_network_scan.yml

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title: Network Scans
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id: fab0ddf0-b8a9-4d70-91ce-a20547209afb
description: Detects many failed connection attempts to different ports or hosts
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author: Thomas Patzke
date: 2017/02/19
logsource:
category: firewall
detection:
selection:
action: denied
timeframe: 24h
condition:
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- selection | count(dst_port) by src_ip > 10
- selection | count(dst_ip) by src_ip > 10
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fields:
- src_ip
- dst_ip
- dst_port
falsepositives:
- Inventarization systems
- Vulnerability scans
- Penetration testing activity
level: medium