Suspicious Code Compilation via Aspnet_compiler LOLBIN (via process_creation)

ATT&CK techniques

Execution → Defense Evasion

Recon
Resource Dev
Initial Access
Execution
- T1127Trusted Developer Utilities Proxy Execution
Persistence
Priv Esc
Defense Evasion
- T1127Trusted Developer Utilities Proxy Execution
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects aspnet_compiler.exe being executed to compile and run arbitrary code, a signed-binary proxy technique used by AsyncRAT and similar tooling to build a payload in place while evading application allowlisting. Aspnet_compiler abuse is a defense-evasion technique in the Red Canary Threat Detection Report. Detecting this rarely-interactive binary surfaces trusted-utility code execution.

Reporting behind it

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Suspicious Code Compilation via Aspnet_compiler LOLBIN (via process_creation)

Pivot detection · T1127 · 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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