David Cannings (@edeca) profile picture

David Cannings

@edeca

Cyber defence, reverse engineering and network geekery. Christian, husband & father of three. All views my own.

edeca.net
Joined September 2009
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Photo by David Cannings (@edeca)Photo by David Cannings (@edeca)Photo by David Cannings (@edeca)Photo by David Cannings (@edeca)Photo by David Cannings (@edeca)Photo by David Cannings (@edeca)Photo by David Cannings (@edeca)Photo by David Cannings (@edeca)Photo by David Cannings (@edeca)Photo by David Cannings (@edeca)
Day 9 of #adventofcode2024 - accidentally left my test output enabled 🙈
Console showing a selection of random emoji representing the "files" from the Advent of Code day 9 challenge.

ALT Console showing a selection of random emoji representing the "files" from the Advent of Code day 9 challenge.

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This is a neat way of signaturing PDF samples, provided you carefully manage performance. I wrote a short post explaining how it works and a few suggestions for enhancements: edeca.net/post/2024-06-26-an…

An interesting Callisto YARA rule | edeca.net

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...

edeca.net
Félix Aimé (@felixaime) profile pictureFélix Aimé@felixaime25 Jun 2024
Replying to @felixaime
import "hash" rule Calisto_PDF_streams { strings: $s1 = { 0A 73 74 72 65 61 6D 0A } $s2 = { 0A 65 6E 64 73 74 72 65 61 6D 0A } condition: uint32be(0) == 0x25504446 and for any i in (0..#s1) : ( hash.md5(@s1[i]+8, @s2[i]-@s1[i]-8) == "b9950253cf88305a57cb350deb31c07e" ) }
Image from Félix Aimé (@felixaime)
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I asked #ChatGPT to generate 10 silly policy examples for the upcoming UK election campaign. I think it aced the question on the first try #generalelectionuk
Image from David Cannings (@edeca)
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I wrote a post about testing Magika, which looks very useful for file type classification in malware analysis and more edeca.net/post/2024-03-24-te… #malware #python

Testing Magika | edeca.net

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.

edeca.net
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Fair play to @WeAreOpenreach who turned up and fixed all phone lines within four hours of a contractor cutting through cables. Ironically the contractor was doing preparation work for full fiber (FTTP)… for Openreach!
A telephone pole with two wires dangling out the bottom which have been cut by a digger (not shown)

ALT A telephone pole with two wires dangling out the bottom which have been cut by a digger (not shown)

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Received today from @JLCPCB - great service. A small 8-24V to 5V DC-DC converter, designed for high current (up to 8A out). First SMPS I have laid out, and first 4 layer board. Very happy that it works at no load. Next step: load testing. #PCB #electronics
Image from David Cannings (@edeca)
arturo182 is on Bluesky now (@arturo182) profile picturearturo182 is on Bluesky now@arturo1827 Sep 2023
Advertise your account with one PCB. I'll start
The RP2040 Stamp

ALT The RP2040 Stamp

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Voltage ripple on the output is 31mV at 15V in with no load.
Image from David Cannings (@edeca)
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With the help of my Aussie BBQ spirit guide @pewpew_lazors I cooked pulled pork for the first time 🐷 2.1KG of pork shoulder (no bone), apple wood chunks, six slow hours at low temperature.
Image from David Cannings (@edeca)
Image from David Cannings (@edeca)
Image from David Cannings (@edeca)
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Alternate take: not even Linus can get multiple monitors working on Linux 😂
Kevin Naughton Jr. (@KevinNaughtonJr) profile pictureKevin Naughton Jr.
@KevinNaughtonJr4 Sep 2023
"i need 3 monitors" "i need a mechanical keyboard" "i need noise cancelling headphones" Linus Torvalds, creator of the Linux operating system's, setup:
Image from Kevin Naughton Jr. (@KevinNaughtonJr)
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When you reach 6 times the speed of light it’s no wonder you open a wormhole to minus ten quadrillion feet below sea level #VirginOrbit #RocketLaunch
Image from David Cannings (@edeca)
Image from David Cannings (@edeca)
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Missed opportunity to make these look like Daleks.
Bob From Accounts 🚲 (@BobFromAccounts) profile pictureBob From Accounts 🚲@BobFromAccounts2 Jan 2023
🧵 A lot of love for these sturdy soldiers, protecting the frontline of driver entitlement included at the new pedestrianisation of #StrandAldwych. Remove cars, restore life. Now do Soho @CityWestminster @WorldBollard
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This is the real reason Brussels sprouts are an essential part of Christmas Dinner #ClimateAction
Prof Jim Wild (@jim_wild) profile pictureProf Jim Wild@jim_wild26 Dec 2022
The GB electricity generation mix currently including 58% wind generation 😀
Image from Prof Jim Wild (@jim_wild)
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Here’s a question about encryption from the study book for an iGCSE in Computer Science. Baffled 😐
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It's #AdventOfCode2022 day 14 and we were happily spelunking until sand started pouring on top of us. Part one looks great rendered as an image, generated with #Python and #ffmpeg 🎄
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Another day, another #AdventOfCode2022 challenge. This time we join the elves solving a maze, which looks fun when animated 🎄.
It’s the most wonderful time of year again. Carols with a modern twist in Rock the Manger. Sound and lighting by @sammysimpson94 and me, powered by @ChamSysLtd MagicQ and @Behringer X32.
Interior of a church, with a band playing at the front lit in pink and blue. Photo taken from the rear showing the back of the congregation.

ALT Interior of a church, with a band playing at the front lit in pink and blue. Photo taken from the rear showing the back of the congregation.

Interior of a church, with a band playing at the front lit in red. Photo taken from the rear showing the back of the congregation.

ALT Interior of a church, with a band playing at the front lit in red. Photo taken from the rear showing the back of the congregation.

Interior of a church, with a band playing at the front lit in vibrant colours for the song Feliz Navidad. Photo taken from the sound booth, showing a Behringer X32 sound desk, laptop running Chamsys MagicQ and a PC running EasyWorship.

ALT Interior of a church, with a band playing at the front lit in vibrant colours for the song Feliz Navidad. Photo taken from the sound booth, showing a Behringer X32 sound desk, laptop running Chamsys MagicQ and a PC running EasyWorship.

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I think I spent more time drawing this animation than solving the puzzle for day 9 - great fun so far #AdventOfCode2022 🎄
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I guess I’ve upgraded to three factor authentication. My trusty @Yubico lost a fight with a four year old 😂
Image from David Cannings (@edeca)
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This wording leaves a lot to be desired @BBCMoreOrLess. Your show is one of the best on Radio 4, but this tweet is terrible. Ukraine has regained territory at great cost, and I pray there is a path to peace.
BBC More or Less (@BBCMoreOrLess) profile pictureBBC More or Less@BBCMoreOrLess21 Sep 2022
Russia has lost 9,500 square kilometres of territory since the start of the recent Ukrainian offensive around Kharkiv according to @War_Mapper. We explain how large and significant a figure that is in this week's programme. bbc.co.uk/programmes/m001c6m…
BBC Radio 4 - More or Less, The size of Ukraine’s offensive, weak pound and how much do women...

BBC Radio 4 - More or Less, The size of Ukraine’s offensive, weak pound and how much do women...

We ask how much progress Ukraine has really made in recapturing territory from Russia.

bbc.co.uk
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A soldier from The Royal Microphones Brigade ensures we can hear the big day with minimal wind noise #queensfuneral
The coffin of Queen Elizabeth the second is pulled through London, followed by naval ratings, members of the Royal Family and a soldier in a large, fluffy bear skin hat.

ALT The coffin of Queen Elizabeth the second is pulled through London, followed by naval ratings, members of the Royal Family and a soldier in a large, fluffy bear skin hat.

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Three things are certain in life: death, taxes and weird implementations of RC4 in malware.
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