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Suspicious DNS Query with B64 Encoded String

Detects suspicious DNS queries using base64 encoding

MITRE ATT&CK

exfiltrationcommand-and-control

Detection Query

selection:
  query|contains: ==.
condition: selection

Author

Florian Roth (Nextron Systems)

Created

2018-05-10

Data Sources

dns

References

https://github.com/krmaxwell/dns-exfiltration

Tags

attack.exfiltrationattack.t1048.003attack.command-and-controlattack.t1071.004

Raw Content

title: Suspicious DNS Query with B64 Encoded String
id: 4153a907-2451-4e4f-a578-c52bb6881432
status: test
description: Detects suspicious DNS queries using base64 encoding
references:
    - https://github.com/krmaxwell/dns-exfiltration
author: Florian Roth (Nextron Systems)
date: 2018-05-10
modified: 2022-10-09
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