Malicious AddInProcess32 Network Beacon on PureRAT C2 Ports

ATT&CK techniques

Priv Esc → C2

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
- T1055Process Injection
Defense Evasion
- T1055Process Injection
Cred Access
Discovery
Lateral Movement
Collection
C2
- T1071.001Web Protocols
Exfiltration
Impact

What it detects

This rule detects the .NET AddInProcess32.exe host process establishing outbound connections to TCP ports 56001 through 56003. Attackers reflectively load the PureRAT payload into AddInProcess32.exe to blend malicious traffic with a signed Microsoft binary. Outbound traffic from this process to the fixed high port range is a strong indicator of PureRAT command and control.

Reporting behind it

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Malicious AddInProcess32 Network Beacon on PureRAT C2 Ports

Pivot detection · T1055 · 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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