Sigma rule: Low Reputation Effective Top-Level Domain (eTLD)

Rule

Title

Low Reputation Effective Top-Level Domain (eTLD)

Status

experimental

Level

medium

Author

Norbert Jaśniewicz (AlphaSOC)

Date

2025-08-04

File

rules-threat-hunting/network/net_dns_low_reputation_etld.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects DNS queries to domains within known low reputation eTLDs. This rule uses AlphaSOC's threat intelligence data and is updated on a monthly basis.

Log source

category

dns

Detection

selection:
    query|endswith:
        - '.duckdns.org'
        - '.top'
        - '.ddns.net'
        - '.gl.at.ply.gg'
        - '.portmap.io'
        - '.icu'
        - '.zapto.org'
        - '.live'
        - '.hopto.org'
        - '.portmap.host'
        - '.sbs'
        - '.sytes.net'
        - '.click'
        - '.ydns.eu'
        - '.site'
        - '.cloud'
        - '.no-ip.org'
        - '.kozow.com'
        - '.lat'
        - '.pro'
condition: selection

False positives (as the rule lists them)

• Unknown

Tags

• attack.command-and-control
• attack.t1071.004
• attack.initial-access
• detection.threat-hunting

MITRE ATT&CK ids this rule names

• T1071.004

References

• https://feeds.alphasoc.net/bad-etlds.txt

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-threat-hunting/network/net_dns_low_reputation_etld.yml