2019-10-25 02:30:55 +00:00
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action: global
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2020-02-20 22:00:16 +00:00
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title: High DNS Bytes Out
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2019-12-19 22:56:36 +00:00
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id: 0f6c1bf5-70a5-4963-aef9-aab1eefb50bd
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2019-10-25 02:30:55 +00:00
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status: experimental
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2020-09-15 13:02:30 +00:00
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description: High DNS queries bytes amount from host per short period of time
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2019-10-25 02:30:55 +00:00
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author: Daniil Yugoslavskiy, oscd.community
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date: 2019/10/24
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2020-08-27 17:43:47 +00:00
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modified: 2020/08/27
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2020-09-15 13:02:30 +00:00
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falsepositives:
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- Legitimate high DNS bytes out rate to domain name which should be added to whitelist
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level: medium
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2019-10-25 02:30:55 +00:00
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tags:
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- attack.exfiltration
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2020-08-27 17:43:47 +00:00
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- attack.t1048 # an old one
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- attack.t1048.003
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2019-10-25 02:30:55 +00:00
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---
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logsource:
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category: dns
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detection:
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selection:
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query: '*'
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timeframe: 1m
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condition: selection | sum(question_length) by src_ip > 300000
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---
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logsource:
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category: firewall
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detection:
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selection:
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dst_port: 53
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timeframe: 1m
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condition: selection | sum(message_size) by src_ip > 300000
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