High NULL Records Requests Rate

calendar Apr 21, 2023 · attack.exfiltration attack.t1048.003 attack.command_and_control attack.t1071.004  ·
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Extremely high rate of NULL record type DNS requests from host per short period of time. Possible result of iodine tool execution

Sigma rule (View on GitHub)

 1title: High NULL Records Requests Rate
 2id: 44ae5117-9c44-40cf-9c7c-7edad385ca70
 3status: unsupported
 4description: Extremely high rate of NULL record type DNS requests from host per short period of time. Possible result of iodine tool execution
 5author: Daniil Yugoslavskiy, oscd.community
 6date: 2019/10/24
 7modified: 2023/03/24
 8tags:
 9    - attack.exfiltration
10    - attack.t1048.003
11    - attack.command_and_control
12    - attack.t1071.004
13logsource:
14    category: dns
15detection:
16    selection:
17        record_type: 'NULL'
18    timeframe: 1m
19    condition: selection | count() by src_ip > 50
20falsepositives:
21    - Legitimate high DNS NULL requests rate to domain name which should be added to whitelist
22level: medium

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