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RagnarSecurity's profile picture. Shielding you from security vulnerabilities!

Ragnar Security

@RagnarSecurity

Shielding you from security vulnerabilities!

35Posts 270Followers 50Following
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Ragnar Security reposted
_JohnHammond's profile picture.
John Hammond
@_JohnHammond
May 24, 2024

But we could never forget about those Binary Exploitation buffs! In fact we've got something fun for you: @RagnarSecurity 's latest predicament: "So Much Cache!" Pwn this challenge and more at #NahamCon2024 CTF jh.live/nahamcon-ctf (5/23-5/25)

_JohnHammond's tweet image. But we could never forget about those Binary Exploitation buffs! In fact we've got something fun for you: @RagnarSecurity 's latest predicament: "So Much Cache!" Pwn this challenge and more at #NahamCon2024 CTF jh.live/nahamcon-ctf (5/23-5/25)
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Ragnar Security reposted
_JohnHammond's profile picture.
John Hammond
@_JohnHammond
Jun 29, 2023

Leveraging Netsh Helper DLLs for living-off-the-land code execution (and optional persistence), staged with shellcode for a Sliver C2 session! Showcases built with both C++ and Nim... and boy I love getting practice with Nim 👑 youtu.be/lMihdys4jw8

_JohnHammond's tweet image. Leveraging Netsh Helper DLLs for living-off-the-land code execution (and optional persistence), staged with shellcode for a Sliver C2 session! Showcases built with both C++ and Nim... and boy I love getting practice with Nim 👑 youtu.be/lMihdys4jw8
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RagnarSecurity's profile picture.
Ragnar Security
 @RagnarSecurity
Jan 25, 2023

WittsEnd2 created a new article about one of the CTF challenges he wrote. It is a basic code injection challenge using ptrace! ragnarsecurity.medium.com/limited-resour…

RagnarSecurity's tweet card. Hello — It’s WittsEnd2 again. As Linux continues to mature, advanced security features are added to both the userspace and kernel space…
Limited Resources: Using Linux’s Ptrace to Achieve Your Ends
Source: systemweakness.com
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Ragnar Security reposted
umdcsec's profile picture.
UMD Cybersecurity
 @umdcsec
Feb 27, 2022

It's that magical time of year again - UMDCTF 2022!!! Starting March 4th check out some incredible challs from the folks at UMDCSEC! Visit umdctf.io for more details <3

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Ragnar Security reposted
0xDexter0us's profile picture.
Dexter0us
 @0xDexter0us
Jan 14, 2022

How to make money and be successful in #infosec and #bugbounty without any knowledge and skills of hacking, coding. #bugbountytips #bugbountytip A thread. 🧵👇

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Ragnar Security reposted
colinoflynn's profile picture.
Colin O'Flynn
 @colinoflynn
Dec 22, 2021

Something to finish off 2021 with a bang for you: It's now possible to build a (mostly safe) #EMFI tool for ~$50. Details are in the new 'PicoEMP' repository, including gerbers + design decision notes. Inspired from my @hackaday remoticon talk! github.com/newaetech/chip…

colinoflynn's tweet image. Something to finish off 2021 with a bang for you: It&apos;s now possible to build a (mostly safe) #EMFI tool for ~$50. Details are in the new &apos;PicoEMP&apos; repository, including gerbers + design decision notes. Inspired from my @hackaday remoticon talk! github.com/newaetech/chip…
colinoflynn's tweet image. Something to finish off 2021 with a bang for you: It&apos;s now possible to build a (mostly safe) #EMFI tool for ~$50. Details are in the new &apos;PicoEMP&apos; repository, including gerbers + design decision notes. Inspired from my @hackaday remoticon talk! github.com/newaetech/chip…
colinoflynn's tweet image. Something to finish off 2021 with a bang for you: It&apos;s now possible to build a (mostly safe) #EMFI tool for ~$50. Details are in the new &apos;PicoEMP&apos; repository, including gerbers + design decision notes. Inspired from my @hackaday remoticon talk! github.com/newaetech/chip…
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Ragnar Security reposted
shmoocon's profile picture.
ShmooCon
 @shmoocon
Dec 30, 2021

ShmooCon 2022 postponed to March 24-26. More information here: shmoocon.org/2021/12/30/shm…

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RagnarSecurity's profile picture.
Ragnar Security
 @RagnarSecurity
Dec 20, 2021

WittsEnd2 is writing a series about developing baremetal firmware. He just completed his first article. You can read it here: ragnarsecurity.medium.com/writing-bareme…

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Ragnar Security reposted
_JohnHammond's profile picture.
John Hammond
@_JohnHammond
Dec 20, 2021

I completed the Kerberoasting on an Open Fire challenge! holidayhackchallenge.com Don't miss out on SANS #HolidayHack x @KringleCon holidayhackchallenge.com

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RagnarSecurity's profile picture.
Ragnar Security
 @RagnarSecurity
Sep 3, 2021

Interesting writeups from @cor_ctf challenge writers Will's Root and D3v17 on their challenges Fire of Salvation and Wall of Perdition (Linux Kernel Pwn CTF Challenges): willsroot.io/2021/08/corctf… syst3mfailure.io/wall-of-perdit…

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RagnarSecurity's profile picture.
Ragnar Security
 @RagnarSecurity
Aug 28, 2021

Ever wanted to know how the kernel security feature Seccomp works? WittsEnd2 will teach you and go through a CTF challenge involving Seccomp! link.medium.com/LDKEzneI5ib

RagnarSecurity's tweet card. Today, we are going to be exploring Seccomp, which is a Linux kernel security feature. We will explore this through the challenge…
Understanding The Linux Kernel Through CTF Challenges: Seccomp
Source: link.medium.com
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RagnarSecurity's profile picture.
Ragnar Security
 @RagnarSecurity
Jul 27, 2021

Interesting writeup from the Hack-A-Sat 2 Qualifiers CTF. This writeup is for the challenge Mars or Bust, which is an embedded reverse engineering challenge: gist.github.com/ZetaTwo/d437be…

RagnarSecurity's tweet card. Hack-a-Sat 2021 Qualifiers - Mars or Bust: Write-up - Hack-a-Sat 2021 Qualifiers - Mars or Bust: Write-up.md
Hack-a-Sat 2021 Qualifiers - Mars or Bust: Write-up
Source: gist.github.com
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RagnarSecurity's profile picture.
Ragnar Security
 @RagnarSecurity
Jun 20, 2021

WittsEnd2 just posted part 3 of his reverse engineering bare-metal tutorial series. This tutorial goes into reading ARM assembly code and exploiting bare-metal firmware vulnerabilities. ragnarsecurity.medium.com/reverse-engine…

RagnarSecurity's tweet card. Hello everyone, I am WittsEnd2: founder of Ragnar Security, and I will be continuing to teach you how to reverse engineer (and exploit)…
Reverse Engineering Bare-Metal Firmware — Part 3 | Analyzing ARM Assembly and Exploiting
Source: medium.com
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RagnarSecurity's profile picture.
Ragnar Security
 @RagnarSecurity
Apr 12, 2021

WittsEnd2 just published a new article related to reverse engineering bare-metal kernel images using QEMU. Click here to read: link.medium.com/uZWZOnQkpfb

RagnarSecurity's tweet card. *** This tutorial was designed as a setup tutorial for UMDCTF; however, it will be also be a part of a series for bare-metal embedded…
Reverse Engineering Bare Metal Low-Level kernel images with QEMU- Getting Started
Source: link.medium.com
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Ragnar Security reposted
MsftSecIntel's profile picture.
Microsoft Threat Intelligence
@MsftSecIntel
Jan 25, 2021

The attackers behind Solorigate detached the execution of the 2nd-stage payload, a custom Cobalt Strike loader, from the compromised binary’s process by creating an IFEO Debugger registry value for dllhost.exe and waiting for it run. ICYMI, our analysis: msft.it/6013psLtW

MsftSecIntel's tweet card. Our continued investigation into the Solorigate attack has uncovered new details about the handover from the Solorigate DLL backdoor (SUNBURST) to the Cobalt Strike loader (TEARDROP, Raindrop, and...
Deep dive into the Solorigate second-stage activation: From SUNBURST to TEARDROP and Raindrop |...
Source: microsoft.com
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