1200KM / sigma-rule
Suspicious DNS Query with B64 Encoded String — Sigma Rule
Sigma rule 4153a907-2451-4e4f-a578-c52bb6881432. Suspicious DNS Query with B64 Encoded String — Sigma Rule. Detects suspicious DNS queries using base64 encoding
Rule metadata and linked tags
Author: Florian Roth (Nextron Systems). Source status: test; severity: medium. Source dates: 2018-05-10 / 2022-10-09.
{
"category": "dns"
}Pinned original Sigma rule · Detection Rule License 1.1
Source SHA-256: 34bb92d59041475b8d8d26d14846865d697cc64f594cf3b16100f0daf8068b3e
Detection logic
Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.
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
False positives
- Unknown
Source references
Connected ecosystem references
Exact source-tagged techniques
Telemetry review
Read the original logsource above, then inspect the linked detection workspaces for technique-level sensor context. No per-rule telemetry equivalence is inferred.
Pinned research references. No browser attack runner, live simulation result or validated detector is asserted. Source mappings and validation limits are preserved. ATT&CK / Atomic provenance · Detection provenance.