闲言碎语(彭嘉佑)

Thursday, April 23, 2020

Top Users Command In Linux Operating System With Descriptive Definitions

Linux is a command line interface and has a graphical interface as well. But the only thing we should know how we interact with Linux tools and applications with the help of command line. This is the basic thing of Linux. As you can do things manually by simple clicking over the programs just like windows to open an applications. But if you don't have any idea about commands of Linux and definitely you also don't know about the Linux terminal. You cannot explore Linux deeply. Because terminal is the brain of the Linux and you can do everything by using Linux terminal in any Linux distribution. So, if you wanna work over the Linux distro then you should know about the commands as well.
In this blog you will get a content about commands of Linux which are collectively related to the system users. That means if you wanna know any kind of information about the users of the system like username passwords and many more.

id

The "id" command is used in Linux operating system for the sake of getting knowledge about active user id with login and group. There may be different users and you wanna get a particular id of the user who is active at that time so for this you just have to type this command over the terminal.

last

The "last" command is used in Linux operating system to show the information about the last logins on the system. If you forget by which user id you have logged in at last time. So for this information you can search login detail by using this command.

who

The "who" command is used in Linux distributions to display the information about the current user which a an active profile over the Linux operating system. If you are in the system and you don't know about that active user and suddenly you have to know about that user detail so you can get the info by using this command.

groupadd

The "groupadd admin" is the command which is used in Linux operating system to add a group in the Linux system to gave the privileges to that group.

useradd

The "useradd" command is used in Linux operating system to add user or users to a specific group. If you wanna add a user name Umer so for this matter you just have to write a command i.e. useradd -c "Umer".

userdel

The "userdel" command is used in Linux operating system for the purpose to delete any user or users from the particular group present in the linux operating system. For example "userdel Umer" this command will delete the user named Umer.

adduser

The "adduser" command is a simple command used to create directly any user in the system. There is no need to make a group for this. You just have to type the command with user name like adduser Umer, it will created a user by name Umer.

usermod

The "usermod" is a command used in Linux operating system to modify the information of any particular user. You can edit or delete information of any particular user in the Linux operating system.

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Wednesday, April 22, 2020

Pointers Part 1: The Basics

So you're eager to learn about pointers but unfortunately you got stuck because they seemed to you terrible in nature? That's not true I know, but many of the people get confused when they arrive at the topic of pointers. Well pointers are the most important tools in C programming and are the one that can make you fly (unless you don't know how to ride over them). In this article we're going to learn basics of pointers.

Pointers are the varaibles that store addresses of other variables. Easy ain't it?

So lets start with the decleration of a pointer, pointer is decreleared as:

data_type *var_name;
e,g
int *pt;

well the astrisk(*) before the variable name is the thing that makes variable a pointer. So far so good now what?
Now lets say we want to store address of a variable in our pointer variable that seems pretty complex..!

Let's do it:

int number = 100;
int *pt = &num;

Is it really complex..?
what we are doing here is that we are first declaring and initializing a integer variable (number) with value of 100 and then we declare and initialize a pointer variable (pt) with the address of number variable. Now pt (pointer variable) contains the address of number (integer varaible). So what? Now we can use this pointer variable to change the value of number variable. Is this some kind of Magic? Maybe. Lets' do it:

*pt = 200;

what we have done here is that we De-referencing the pt variable with the asterisk (*) and then assigned it the value of 200 now the number variable contains 200. Isn't it a magic? De-referencing is used for accessing the value of the variable towards which our pointer is pointing simple. So lets write a full program of what we have learned so far.

/*Pointer Basics: Creating and Using Pointers*/
#include<stdio.h>
int main(void){
int number = 100;
int *pt = &number;
printf("Value of 'number' is: %d", number);
printf("Address of 'number' is: %p", pt);
*pt = 200;
printf("New value of 'number' is: %d", number);
return 0;
}

What this whole program did was it created a integer variable and a pointer to integer variable and then printed out the value and address of the 'number' variable and after that we De-referenced the pointer variable so that we can access the value to which our pointer variable is pointing and changed the old 100 value with new 200 value and at last we printed that out. Easy isn't it?
But do you know that you can get the address of a variable even by using ampersand (&) operator? Lemme show you how. I'll declare and initialize a variable 'var' and then print it to screen using ampersand (&) operator:

int var = 10;
printf("Address of 'var' is %p\n", &var);

the last statement here will print out the address of 'var' not value so that means it is equal to this statement:

int *pt = &var;
printf("Address of 'var' is %p\n", pt);

here we first assigned the address of 'var' to pointer variable 'pt' and then printed out the address of 'var' using the pointer variable (pt).
So lets write another program that will wrap up this part of 'Pointer Basics':

/*Pointer Basics Part 1: Program 2*/
#include<stdio.h>
int main(void){
   int var = 10;
   int *pt = &var;
   printf("The Value of 'var' is: %d\n", var);
   printf("De-referencing: *pt = %d\n", *pt);
   printf("Ampersand: The Address of 'var' is %p\n", &var);
   printf("pt = %p\n", pt);
   return 0;
}

So that's the end of first part watch out for the next part in which we'll tighten our grip on pointers and get ready for some Advanced '*po(inter)-fo'.

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How To Hack Facebook Messenger Conversation

FACEBOOK Messenger has become an exceptionally popular app across the globe in general. This handy app comes with very interactive and user-friendly features to impress users of all ages.

With that being said, there are a lot of people who are interested in knowing how to hack Facebook Messenger in Singapore, Hong Kong and other places. The requirement to hack Facebook Messenger arises due to various reasons. In this article, we are going to explain how to hack Facebook Messenger with ease.

As you may know, Facebook Messenger offers a large range of features. Compared to the initial release of this app, the latest version shows remarkable improvement. Now, it has a large range of features including group chats, video calls, GIFs, etc. A lot of corporate organizations use Facebook messenger as a mode of communication for their marketing purposes. Now, this messenger app is compatible with chatbots that can handle inquiries.

Why Hack Facebook Messenger in Singapore?

You may be interested in hacking Facebook Messenger in Singapore (or anywhere else) for various reasons. If you suspect that your partner is having an affair, you may want to hack Facebook Messenger. Or, if you need to know what your kids are doing with the messenger, you will need to hack it to have real time access.

You know that both of these situations are pretty justifiable and you intend no unethical act. You shouldn't hack Facebook Messenger of someone doesn't relate to you by any means, such a practice can violate their privacy. Having that in mind, you can read the rest of this article and learn how to hack Facebook Messenger.

How to Hack Someone's Facebook Messenger in Singapore

IncFidelibus is a monitoring application developed by a team of dedicated and experienced professionals. It is a market leader and has a customer base in over 191+ countries. It is very easy to install the app, and it provides monitoring and hacking of Facebook for both iOS and Android mobile devices. You can easily hack into someone's Facebook messenger and read all of their chats and conversations.

Not just reading the chats, you can also see the photo profile of the person they are chatting to, their chat history, their archived conversations, the media shared between them and much more. The best part is that you can do this remotely, without your target having even a hint of it. Can it get any easier than this?

No Rooting or Jailbreaking Required

IncFidelibus allows hacking your target's phone without rooting or jailbreaking it. It ensures the safety of their phone remains intact. You don't need to install any unique rooting tool or attach any rooting device.

Total Web-Based Monitoring

You don't need to use any unique gadget or app to track activity with IncFidelibus. It allows total web-based monitoring. All that you need is a web browser to view the target device's data and online activities.

Spying With IncFidelibus in Singapore

Over ten years of security expertise, with over 570,000 users in about 155+ countries, customer support that can be reached through their website, and 96% customer satisfaction. Need more reasons to trust IncFidelibus?

Stealth Mode

IncFidelibus runs in pure Stealth mode. You can hack and monitor your target's device remotely and without them knowing about it. IncFidelibus runs in the background of your target's device. It uses very less battery power and doesn't slow down your phone.

Hacking Facebook Messenger in Singapore using IncFidelibus

Hacking Facebook Messenger has never been this easy. IncFidelibus is equipped with a lot of advance technology for hacking and monitoring Facebook. Hacking someone's Facebook Messenger is just a few clicks away!

Track FB Messages in Singapore

With IncFidelibus, you can view your target's private Facebook messages and group chats within a click. This feature also allows you to access the Facebook profile of the people your target has been interacting with. You can also get the media files shared between the two.

Android Keylogger

IncFidelibus is equipped with a powerful keylogger. Using this feature, you can record and then read every key pressed by your target on their device.

This feature can help get the login credentials of your target. You can easily log into someone's Facebook and have access to their Facebook account in a jiffy.

What Else Can IncFidelibus Do For You?

IncFidelibus control panel is equipped with a lot of other monitoring and hacking tools and services, including;

Other Social Media Hacking

Not just FB messenger, but you can also hack someone's Instagram, Viber, Snapchat, WhatsApp hack, SMS conversations, call logs, Web search history, etc.

SIM card tracking

You can also track someone SIM card if someone has lost their device, changed their SIM card. You can get the details of the new number also.

Easy Spying Possible with IncFidelibus

Monitoring someone's phone is not an easy task. IncFidelibus has spent thousands of hours, had sleepless nights, did tons of research, and have given a lot of time and dedication to make it possible.

@HACKER NT

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Monday, April 20, 2020

CEH: Gathering Host And Network Information | Scanning

Scanning

It is important that the information-gathering stage be as complete as possible to identify the best location and targets to scan. After the completion of footprinting and information gathering methodologies, scanning is performed.
During scanning, the hacker has vision to get information about network an hosts which are connected to that network that can help hackers to determine which type of exploit to use in hacking a system precisely. Information such as an IP addresses, operating system, services, and installed applications.

Scanning is the methodology used to detect the system that are alive and respond on the network or not. Ethical hackers use these type of scanning to identify the IP address of target system. Scanning is also used to determine the availability of the system whether it is connected to the network or not.

Types Of Scanning

Network Scanning	Identifies IP addresses on a given network or subnet
Port Scanning	Determines open, close, filtered and unfiltered ports and services
Vulnerability Scanner	Detect the vulnerability on the target system

Port Scanning

Port scanning is the process of identifying open and available TCP/IP ports on a system. Port-scanning tools enable a hacker to learn about the services available on a given system. Each service or application on a machine is associated with a well-known port number. Port Numbers are divided into three ranges:

Well-Known Ports: 0-1023
Registered Ports: 1024-49151
Dynamic Ports: 49152-6553

Network Scanning

Network scanning is performed for the detection of active hosts on a network either you wanna attack them or as a network administrator. Network-scanning tools attempt to identify all the live or responding hosts on the network and their corresponding IP addresses. Hosts are identified by their individual IP addresses.

Vulnerability Scanning

This methodology is used to detect vulnerabilities of computer systems on a network. A vulnerability scanner typically identifies the operating system and version number, including applications that are installed. After that the scanner will try to detect vulnerabilities and weakness in the operating system. During the later attack phase, a hacker can exploit those weaknesses in order to gain access to the system. Moreover, the vulnerability scanner can be detected as well, because the scanner must interact over the network with target machine.

The CEH Scanning Methodology

As a CEH, you should understand the methodology about scanning presented in the figure below. Because this is the actual need of hackers to perform further attacks after the information about network and hosts which are connected to the network. It detects the vulnerabilities in the system bu which hackers can be accessible to that system by exploitation of that vulnerabilities.

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