Possible DNS Rebinding

Detects DNS-answer with TTL <10.

Sigma rule (View on GitHub)

 1title: Possible DNS Rebinding
 2id: ec5b8711-b550-4879-9660-568aaae2c3ea
 3status: unsupported
 4description: 'Detects DNS-answer with TTL <10.'
 5date: 2019/10/25
 6author: Ilyas Ochkov, oscd.community
 7references:
 8    - https://medium.com/@brannondorsey/attacking-private-networks-from-the-internet-with-dns-rebinding-ea7098a2d325
 9tags:
10    - attack.command_and_control
11    - attack.t1043
12logsource:
13    product: dns
14detection:
15    selection:
16        answer: '*'
17    filter1:
18        ttl: '>0'
19    filter2:
20        ttl: '<10'
21    timeframe: 30s
22    condition: selection and filter1 and filter2 | count(answer) by src_ip > 3
23level: medium

References

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