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MediumSigmaHQ Andreas Hunkeler (@Karneades)

New PortProxy Registry Entry Added

Detects the modification of the PortProxy registry key which is used for port forwarding.

Detection logic

Detection requirements

Platform: ESXi Linux macOS Network Devices Windows
The rule states no platform. This is derived from the ATT&CK technique it maps to.
Log source product: windows
Log source category: registry_event

Known benign triggers

Synergy Software KVM (https://symless.com/synergy)
WSL2 network bridge PowerShell script used for WSL/Kubernetes/Docker (e.g. https://github.com/microsoft/WSL/issues/4150#issuecomment-504209723)

References

Links the source published beside this detection. Reference is the link the source wrote, unmodified. Class is decided by this catalogue from the host and path, not stated by the source. Cited by counts published detections citing the same resource, including this one, and the sources beneath it count the repositories this catalogue ingests, which is not the same as independent research.
Reference	Class	Cited by
adepts.of0x.cc/netsh-portproxy-code/	Unclassified	2
www.dfirnotes.net/portproxy_detection/	Unclassified	2
www.fireeye.com/blog/threat-research/2019/01/bypassing-network-restrictions-through-rdp-tunneling.html	Threat report	4

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