The ncacn_http identifier is a protocol sequence constant used in Microsoft’s RPC implementation. Its primary purpose is to enable client-server communication across the internet by using Internet Information Services (IIS) as an RPC proxy.

This exploit is often associated with an elevation of privilege vulnerability, where an attacker could potentially use it to gain higher-level access on a system than they are supposed to have. The specific details of the exploit, including how it works and the versions of Windows it affects, can vary.

From that night on, Maya pushed for a new rule at every cybersecurity conference she attended: Trust the protocol, not the port. And never, ever trust a wolf that knocks on port 80.

Here is a short story inspired by that concept.

Location: Network Deep Packet Inspection Array, Sector 7

Exploits involving ncacn_http often target the underlying RPC runtime or the services exposed through the proxy.

NCACN over HTTP. Microsoft’s remote procedure call, wrapped in web traffic to traverse firewalls.

As she initiated a full tier-zero credential rotation, she watched the attacker’s last packet. It was a clean RPC_BIND_ACK —polite, almost. The digital equivalent of a thief tipping his hat before walking out the door.