Suspicious DNS Query with B64 Encoded String (via dns)

title: Suspicious DNS Query with B64 Encoded String (via dns)
id: ddd9d277-3057-5e70-9ea6-09a545fe4f24
status: stable
description: This rule detects anomalous DNS queries using base64 encoding
references:
    - https://attack.mitre.org/techniques/T1071/004/
    - https://attack.mitre.org/techniques/T1048/003/
    - https://github.com/krmaxwell/dns-exfiltration
author: Huntrule Team
date: 2026-06-18
tags:
    - attack.exfiltration
    - attack.t1048.003
    - attack.command-and-control
    - attack.t1071.004
logsource:
    category: dns
detection:
    selection:
        query|contains: '==.'
    condition: selection
falsepositives:
    - Unknown
level: medium