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christoffer

Christoffer Claesson

I am Christoffer Claesson, a professional security researcher from Sweden who spends his days (and many nights) on red teaming, security deep dives, and homelab experiments. This blog is my way of giving back to the community by sharing lessons, notes, and the occasional side project that grew bigger than planned.

Sweden •
18 posts •
Redteam Hardware

Its HiDIYous

Its HiDIYous, but it works!…

Christoffer Claesson Christoffer Claesson 1 min read
Hardware Security

Clock Glitching with a ChipWhisperer-Lite

What happens when things get out of sync?… SCIENCE!

Christoffer Claesson Christoffer Claesson 7 min read
Pentest Security

Securityaudit of an OpenSource Software: FreeTAKServer

The parrot is not dead, its RESTing

Christoffer Claesson Christoffer Claesson 7 min read
Hardware Ctf Security

Reverse Engineering an unknown digital protocol: RHME2, Whac a mole

Who doesn’t like a classic game of whac-the-mole? This time the moles infiltrated deep into the backyard of a poor farmer’s family. The moles are ruining the crops, which the farmer desperately needs

Christoffer Claesson Christoffer Claesson 8 min read
Security Redteam

Password audits

This is be a brief overview on why and how to perform a password audit on a windows domain.

Christoffer Claesson Christoffer Claesson 5 min read
Homelab Security

What Virtual Machines Am I Running?

Disclaimer, this is subject to change… very often and very quickly!

Christoffer Claesson Christoffer Claesson 18 min read
Homelab Security

Beats 7.5.0 on PFsense 2.4.4

Long time wanting a beats client to PFSense which runs on FreeBSD, so lets compile it our self from source!

Christoffer Claesson Christoffer Claesson 3 min read
Exploit-dev

ROPEmporium: 3-Write4 (64-bit)

Moving on to the 4th instalment of this series with Write4

Christoffer Claesson Christoffer Claesson 6 min read
Exploit-dev

ROPEmporium: 2-Callme (64-bit)

Continuing the ROP Series with Callme, this time going through Calling conventions

Christoffer Claesson Christoffer Claesson 3 min read
Exploit-dev

ROPEmporium: 1-Split (64-bit)

Doing a ROPEmporium Series, time to switch it up with Split!

Christoffer Claesson Christoffer Claesson 7 min read
Exploit-dev

ROPEmporium: 0-Ret2Win (64-bit)

Doing a series on ROP and ROPEmporium, starting out with a simple ret2win

Christoffer Claesson Christoffer Claesson 6 min read
Hardware Security

Voltage glitching on the cheap

Stand back! We’re doing science! voltage glitching on an Arduino

Christoffer Claesson Christoffer Claesson 5 min read
Ctf

Valentine Writeup

Heartbleeds and dirty cows, i feel sorry for the creator!

Christoffer Claesson Christoffer Claesson 5 min read
Ctf

Falafel Writeup

My writeup of the Hack the box Falafel.

Christoffer Claesson Christoffer Claesson 7 min read
Ctf

Chatterbox Writeup

My writeup of the Hack the box Chatterbox.

Christoffer Claesson Christoffer Claesson 3 min read
Ctf

RSA Prime Decryption

Description and usage of a decryption script that I wrote for CTF Challenges.

Christoffer Claesson Christoffer Claesson 1 min read
Ctf

Nibbles Writeup

“My writeup of the Hack the box Nibbles box… Nibble nibble!”

Christoffer Claesson Christoffer Claesson 4 min read
Security

SDL: Bolt on or Built in?

Time is of the essence. Every day that a business is anything less then fully secure is a day exposed to hackers. It’s also another day that developers continue building applications without factoring

Christoffer Claesson Christoffer Claesson 3 min read
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