Suspicious DNS Tunneling With Hex Subdomain To info Domain (via dns_query)

ATT&CK techniques

C2

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
- T1071.004DNS
- T1132.001Standard Encoding
Exfiltration
Impact

What it detects

This rule detects DNS queries to info domains whose leftmost label is a long hexadecimal string, the encoding CoinLoader uses to tunnel data and receive commands over DNS TXT records. High-entropy hex subdomains under a single parent domain are a strong signal of DNS tunneling rather than normal name resolution.

Reporting behind it

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Suspicious DNS Tunneling With Hex Subdomain To info Domain (via dns_query)

Pivot detection · T1071.004 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

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