Suspicious notepad Outbound Network Connection after Early Bird Injection
- Product
- windows
- Category
- network_connection
- Author
- HuntRule
- Published
- 2026-08-18
- Updated
- 2026-08-28
ATT&CK techniques
Priv Esc → Defense EvasionRecon
Resource Dev
Initial Access
Execution
Persistence
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact
What it detects
This rule detects the Windows notepad process initiating outbound internet connections which it never does legitimately. The TryCloudflare delivered XWorm and AsyncRAT chain used Early Bird APC injection into notepad to run C2 from a benign host. Network activity from notepad reliably indicates injected code beaconing out.
Reporting behind it
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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