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Implementing hypervisor-level behavioral analysis in Linux

Level of difficulty Medium
Reading time 7 min
Views 513

Hey there, Habr! My name is Alexey Kolesnikov. I am a Malware Detection Specialist at the Positive Technologies Expert Security Center (PT ESC). I recently spoke at the AVAR 2023 international conference in Dubai, where I covered new plugins developed by PT ESC for an open-source dynamic malware analysis system named DRAKVUF and demonstrated how they can be used to detect current Linux threats in sandbox for protection against targeted and mass attacks PT Sandbox.

Read on for a brief overview of popular malware monitoring tools for Linux, a description of how our plugins work in DRAKVUF, and a malware analysis that relies on these plugins.

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Total votes 2: ↑1 and ↓1 0
Comments 0

Anonymous identification for groups

Level of difficulty Hard
Reading time 13 min
Views 523

The identification protocol based on the pairing function, resistant to impersonation and compatible with the instant digital signature (IDS) mode, was studied in this article. This protocol uses prover's and verifier's public keys. As a result, there is no anonymity, since certificates including personal data of their owners are issued for the mentioned keys. This article contains a description and analysis of new anonymous identification protocols for groups.

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Detection of meterpreter sessions in Windows OS

Level of difficulty Easy
Reading time 4 min
Views 828

Introduction

Hello Habr! This is a translation of my first article, which was born due to the fact that I once played with the types of meterpreter payload from the Metasploit Framework and decided to find a way to detect it in the Windows OS family.

Analysis

I will try to present everything in an accessible and compact way without delving into all the work. To begin with, I decided to create the nth number of useful loads (windows/meterpreter/reverse_tcp, shell/bind_tcp, shell_hidden_bind_tcp, vncinject/reverse_tcp, cmd/windows/reverse_powershell) to analyze what will happen in the system after their injection.

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ATM security analysis 3.0: PHDays 12 in review

Reading time 8 min
Views 721

 Python, Java, C++, Delphi, PHP—these programming languages were used create a virtual crypto ATM machine to be tested by the participants of the $NATCH contest at Positive Hack Days 12. The entire code was written by ChatGPT and proved to be exceptionally good. This time, we had reviewed the contest concept and decided to use a report system. In addition to standard tasks (kiosk bypass, privilege escalation, and AppLocker bypass), this year's participants faced new unusual tasks. Read on below to find out which ones.

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Rating 0
Comments 1

Harnessing the Power of Machine Learning in Fraud Prevention

Level of difficulty Medium
Reading time 6 min
Views 7.3K

Picture this: A thriving e-commerce platform faces a constant battle against fake reviews that skew product ratings and mislead customers. In response, the company employs cutting-edge algorithms to detect and prevent fraudulent activities. Solutions like these are crucial in the modern digital landscape, safeguarding businesses from financial losses and ensuring a seamless consumer experience.

The industry has relied on rules-based systems to detect fraud for decades. They remain a vital tool in scenarios where continuous collecting of a training sample is challenging, as retraining methods and metrics can be difficult. However, machine learning outperforms rules-based systems in detecting and identifying attacks when an ongoing training sample is available.

With advancements in machine learning, fraud detection systems have become more efficient, accurate, and adaptable. In this article, I will review several ML methods for preventing fraudulent activities and discuss their weaknesses and advantages.

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Total votes 11: ↑11 and ↓0 +11
Comments 1

On Schnorr identification protocol compatibility with instant digital signature mode

Reading time 6 min
Views 461

The article describes the interactive Schnorr identification protocol (hereinafter referred to as the Schnorr protocol) and formulates the problem of compatibility of this protocol with the instant digital signature (IDS) mode. This post shows how to modify the Schnorr protocol to provide such compatibility.

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Rating 0
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Business Continuity and Operation Resilience on paper vs. for real

Level of difficulty Easy
Reading time 7 min
Views 528

Hello, my reading friends!

My previous post (rus) on Habr was about how the Business Continuity Management function started, as well as about its relations with other corporate functions. In fact, it was quite theoretical.

This time, I’d like to tell you about some practical vectors of procedures and tools implementation as regards to Business Continuity Management, or BCM, along with Operational Resilience, or OpRes. Plus some real initiatives that can follow the BCM & OpRes implementation in a company and the associated with it investigation of the corporate landscape and procedures.

More about initiatives for integration
Rating 0
Comments 1

BCM & Operational resilience: yesterday, today, and tomorrow. Where has it come from and what comes next?

Level of difficulty Easy
Reading time 11 min
Views 548

Recently, The BCI, one of the leading institutes working in the field of organizational resilience and business continuity, issued its regular report BCI Operational Resilience Report 2023 in collaboration with Riskonnect, who work with risk management solutions.

One of the questions they asked the respondents was if there was a difference between organizational resilience and operational resilience. As the answers demonstrated, for most respondents (and in most companies) these terms were used as synonyms. Having studied the report, the colleagues brought up another matter – The BCI introduced the new term of "organizational resilience" in addition to "business continuity" and "operational resilience".

If we search Habr for "Business Continuity", "DRP", "BCP", or "BIA", we’ll find quite enough posts by my colleagues (I’ve met some of them face to face and worked with the others) about data system recovery, data system testing, fault-tolerant infrastructure, and some other things. Yet, hardly any of them explain where all of it has come from, how it is changing, where it is heading – and why.

I thought the time has come to change the situation for the better and answer some of the questions like where business continuity provisions and operational resilience has come from, how they are changing, and where this trend is heading and why. To share my thoughts about development of the industry and its current de-facto state in case of a mature (or not too mature) introduction level – some things I’ve stated for my own use.

Intersections BCM & corporate functions
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How to Set Up a Custom Domain and Get a Free SSL Certificate on Firebase

Level of difficulty Easy
Reading time 2 min
Views 1.5K

In my previous article, I showed you how to deploy your project to Firebase and use it for free. Now, let’s explore additional benefits of Firebase. In the upcoming article, I will show you how to set up a custom domain name for your project and utilize a free SSL certificate from Firebase.

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How we built a Cyber Immune product using an open source library: stages, pitfalls, solutions

Reading time 11 min
Views 622
Do you remember how, even before the pandemic set in, companies were striving to provide secure perimeter access for their telecommuters? Especially if super sensitive data was involved such as accounting information or corporate documents. The solutions were complex, bulky and expensive. Can you imagine just how critical it has become now?!

image

My name is Sergey Yakovlev, and I'm the head of the Kaspersky Thin Client project based on our proprietary operating system, KasperskyOS. A thin client is one of the main components of a virtual desktop infrastructure, which is a remote desktop access system. In this article, I will use such a client as an example of how you can build a secure (yet commercially viable!) product. I will cover the stages, the stumbling blocks, the problems and solutions. Let's go!
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Total votes 1: ↑1 and ↓0 +1
Comments 0

Q4 2022 DDoS Attacks and BGP Incidents

Reading time 7 min
Views 1.7K

Now that 2022 has come to an end, we would like to share the DDoS attack mitigation and BGP incident statistics for the fourth quarter of the year, which overall saw unprecedented levels of DDoS attack activity across all business sectors.

In 2022, DDoS attacks increased by 73.09% compared to 2021. 

Let's take a closer look at the Q4 2022 data.

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Total votes 7: ↑7 and ↓0 +7
Comments 0

Payment Village at PHDays 11: pentesting our online bank

Reading time 13 min
Views 1K

Hello everyone! We've already talked in our blog about how the Positive Hack Days 11 forum had a special Payment Village zone, where anyone could look for vulnerabilities in an online bank, ATMs, and POS terminals. Our competition to find vulnerabilities in an online bank is not new, but in recent years it has been somewhat supplanted by ethical hacking activities for other financial systems. In 2022, we decided to correct this injustice and created a new banking platform, making use of all our years of experience. We asked the participants to find typical banking vulnerabilities and report them to us. In the competition, the participants could play for either the "white hats" (participate in the bug bounty program of an online bank) or for the "black hats" (try to steal as much money from the bank as possible).

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BGP Route Leak prevention and detection with the help of the RFC9234

Reading time 8 min
Views 1.7K

All the credit is due to the RFC’s authors: A. Azimov (Qrator Labs & Yandex), E. Bogomazov (Qrator Labs), R. Bush (IIJ & Arrcus), K. Patel (Arrcus), K. Sriram.

A BGP route leak is an unintentional propagation of BGP prefixes beyond the intended scope that could result in a redirection of traffic through an unintended path that may enable eavesdropping or traffic analysis, and may or may not result in an overload or complete drop (black hole) of the traffic. Route leaks can be accidental or malicious but most often arise from accidental misconfigurations.

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Total votes 9: ↑9 and ↓0 +9
Comments 0

How to exchange a secret key over an insecure network (EC-Diffie-Hellman algorithm)

Reading time 6 min
Views 2.1K

Let’s say you want to send an encrypted message to your friend in order to avoid it being intercepted and read by a third party. You generate a random secret key and encrypt the message with it. Let’s say you use AES. But how do you let your friend know the key to decrypt it?

In this article, we will explore how the Elliptic-Curve Diffie-Hellman algorithm works under the hood. The article includes the implementation of this algorithm from scratch, written in Python.

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Total votes 2: ↑2 and ↓0 +2
Comments 2

Anonymity and Authenticity

Reading time 15 min
Views 1.4K

The following text consists of two logically connected parts. The first part constructively rules out the assumption that untraceability supposes anonymity. The second part enumerates specific practical tasks in the form of various scenarios when digital signatures (DS) do not provide correct solutions to the task. It is demonstrated that a complete solution can be obtained through a special combination of DS and an interactive anonymous identification protocol.

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Payment Village at PHDays 11: ATM hacking

Reading time 7 min
Views 1.6K

The Positive Hack Days 11 forum, which took place May 18–19, 2022, was truly epic. The bitterly fought ATM hacking contest featured no fewer than 49 participants. How cool is that? The winner of this year's prize fund of 50,000 rubles, with the handle Igor, was the first to hack the virtual machines. And he wasn't even at the event! :)

Besides Igor, eight other participants picked up prizes this year for their VM-hacking skills. They were: drd0cvientvrazovdurcmzxcvcxzas7asg_krdhundred303, and drink_more_water_dude. A big thank-you to everyone who took part, and for those who weren't at PHDays, here are the links to the virtual machines.

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Total votes 5: ↑3 and ↓2 +1
Comments 1

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