Suspicious DNS Query for TryCloudflare Tunnel Abused for Malware Delivery (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
- T1071.001Web Protocols
- T1102Web Service
Exfiltration
Impact

What it detects

This rule detects DNS resolution of trycloudflare.com subdomains, which threat actors abused as disposable tunnels to host WebDAV shares delivering AsyncRAT and XWorm. TryCloudflare is a legitimate developer service so correlate with script or LNK activity.

Reporting behind it

Related detections9 linkedT1071.001 — drag to rearrange

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Suspicious Cobalt Strike Loader C2 Traffic via Forged MSIE yie9 User-Agent (via proxy)

GateDoor Command-and-Control via gateway REST Endpoints (via proxy)

Suspicious DNS Query for TryCloudflare Tunnel Abused for Malware Delivery (via dns_query)

Pivot detection · T1071.001 · 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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