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My first SSTV

Over the past few weeks I have been experimenting with receiving data from satellites. I built a ground station for both TinyGS and SatNOGS using spare parts.

The most interesting signals received so far were pictures from the International Space Station and a Russian satellite UmKA-1, transmitted using SSTV.

David Cannings

May 14, 2026 2 min read General

Updating HP enterprise SSD firmware on Debian

I recently bought two used HP enterprise SSDs for VM storage on Proxmox. These are rebranded Intel drives, the specific ones I bought are designed for read intensive workloads because that’s what was available second hand.

David Cannings

Feb 9, 2025 7 min read Computing

cloudflared on Debian with Ansible

Today I wanted to make a web service internet facing without exposing the origin server. Cloudflare offers cloudflared, a tool that tunnels traffic from the origin server to Cloudflare’s network. This gives the benefit of Cloudflare’s protection.

David Cannings

Sep 21, 2024 1 min read Computing

Servicing a Chamsys PC Wing

After months of searching I managed to purchase a used Chamsys PC Wing from eBay at a good price. Described as “owned from new by a nightclub venue” and “cosmetically very poor” it was sold as not working.

David Cannings

Aug 26, 2024 3 min read Electronics

An interesting Callisto YARA rule

Yesterday Félix Aimé posted on X (formerly known as Twitter) a neat YARA rule to detect PDF documents. Tweet by @felixaime These documents relate to the Callisto group, which is attributed to the Russian FSB by various Western intelligence agencies.

David Cannings

Jun 26, 2024 9 min read Computing

Testing Magika

Google recently announced the release of Magika, an “AI-powered file-type identification system”. I tested this on a corpus of nearly 125k files to see how it fared.

David Cannings

Mar 24, 2024 9 min read Computing

rtfsig released

Today I released a new tool named rtfsig. rtfsig is a simple Python utility that helps create signatures for malicious RTF documents. The tool automatically generates YARA rules and makes suggestions for VirusTotal’s vtgrep based off potentially distinctive parts of RTF documents.

David Cannings

Sep 21, 2020 1 min read Computing

New GPG key

I have updated my GPG key, revoking ID 0x35076cbaa663a704 and replacing it with 0x57974c5b48a00d9b (find it on keyservers).

David Cannings

Mar 22, 2019 1 min read General, Computing

Signaturing an Authenticode anomaly with YARA

This is a local mirror of a blog written by me and originally published by NCC Group.