Scanning for Microsoft Secure Socket Tunneling Protocol

Over the past month I noticed a resurgence of probe by Digitalocean looking for the Microsoft (MS) Secure Socket Tunneling Protocol (SSTP). This MS proprietary VPN protocol is used to establish a secure connection via the Transport Layer Security (TLS) between a client and a VPN gateway. Additional information on this protocol available here.

Sample Log

20210710-062306: data
SSTP_DUPLEX_POST /sra_{BA195980-CD49-458b-9E23-C84EE0ADCD75}/ HTTP/1.1
SSTPCORRELATIONID: {19730D60-90A0-4623-8C44-688D762AAA16}
Content-Length: 18446744073709551615
Host: XX.XX.28.221



Guy Bruneau IPSS Inc.
My Handler Page
Twitter: GuyBruneau
gbruneau at isc dot sans dot edu


528 Posts
ISC Handler
Jul 10th 2021

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