Shubham Dubey

Exploit Development

Exploiting buffer overflow in Windows application through TextBox using only Alphanumeric payload

Lets look at how to exploit seh based buffer overflow in WIndows GUI application that have input restrictions of supporting only ascii characters as input.

By Shubham Dubey 7 Sep 2018

Malware

Malware analysis interview questions with detailed answers (Part 2)

Here are few more important questions with detailed answers for malware analysis interview. Topic covers in this part is OS concepts, Programming, Assembly language and Dynamic analysis.

By Shubham Dubey 6 Aug 2018

Malware

Malware analysis interview questions with detailed answers (Part 1)

Here is a series of important questions with detailed answers for malware analysis interviews. These question can be helpful for both candidates and interviewers.

By Shubham Dubey 3 Aug 2018

Malware

Deep dive into Tofsee spambot(Win32:Tofsee-J) malware dropper-2

In this part we will do the static analysis of dropper of tofsee .Tofsee is a spambot categorie of malware used to send spam messages, click fraud to different smtp mail server.

By Shubham Dubey 5 Jul 2018

Malware

Deep dive into Tofsee spambot(Win32:Tofsee-J) malware dropper-1

Tofsee is a spambot categorie of malware used to send spam messages, click fraud to different smtp mail server. In this part we will do the dynamic analysis of dropper of tofsee.

By Shubham Dubey 3 Jul 2018

Rootkits

Understanding Windows DKOM(Direct Kernel Object Manipulation) techniques(Part 1-EPROCESS)

Windows uses different Objects structures for different purposes like io-management, process management etc. These structures are vulnerable to different attacks which we will going to discuss in this series.

By Shubham Dubey 13 Jun 2018

Security

Let's discuss about vpn's and tor security

Last week I was looking at Tor network security. I have learnt quite a new things that I didn't knew about earlier. So, I decide to summarize it and put it in a article.

By Shubham Dubey 13 Jun 2018

Virtualization

Creating ARM architecture environment inside x86/x64 linux

If you want your hands on arm architecture assembly then you probably would be wondering how can I generate the *ARM* assembly or use ARM toolset in general inside my intel x86 or x64 architecture system. In this article we will explain you how you can do that by using qemu and chroot.

By Shubham Dubey 9 Feb 2018

Exploit Development

Exploiting Off-by-One buffer overflow vulnerability

Off-by-one vulnerability is little difficult to find and hence can be present in big softwares.It can cause due to not aware of fact if your string provided is not null terminating then strcpy will add a null terminator at the end of string,

By Shubham Dubey 29 Jan 2018

Firmware

Replace your proprietary bios with linux firmware

Intel system comes with UEFI, UEFI is a proprietary and closed-source operating system that can be exploited.NERF (Non-Extensible Reduced Firmware), an open source software system developed at Google can replace almost all of UEFI firmware with a tiny Linux kernel and initramfs.

By Shubham Dubey 5 Jan 2018

Containers

Demystifying Linux Containers(LXC)

Containers are the future when it comes to using and shipping applications. But Linux containers or LXC can be used for more than just that. This article covers the use of LXC on a daily basis as well as for production.

By Shubham Dubey 2 Jan 2018

Security

Finding and removing malware from windows in minimal steps using sysinternals suite

Did your system ever get affected with malwares? Did you know you can manually remove common malwares with very little technical knowledge. In this article I will explain you how to find malware using sysinternals suite.

By Shubham Dubey 31 Dec 2017

Security

Sandboxing and program isolation in linux using many approaches (Part 2)

Containers are tools for isolation which use namespaces to archive that.They are called light weight virtualization because they provide process level isolation only, means they depend on linux kernel.

By Shubham Dubey 30 Dec 2017

Security

Sandboxing and program isolation in linux using many approaches (Part 1)

You can secure your linux system by isolating the malicious program or risky tasks using Sandboxing in different ways to stop it from affecting your main system.Sandboxing means providing a safe environment for a program or software so you can play around it without hurting your system

By Shubham Dubey 29 Dec 2017

Virtualization

Data Storage virtualization in Linux (Part 2)

In the previous part we talked about how we can create sparse file storage and create file system to mount or share across network. Now we will look into some common disk operations that we can do with this storage like scaling, encryption etc.

By Shubham Dubey 28 Dec 2017