Installing SyntaxNet on your systemm

SyntaxNet: Neural Models of Syntax.

Installation

Running and training SyntaxNet models requires building this package from source. You'll need to install:

• bazel:
  • follow the instructions here
  • Note: You must use bazel version 0.2.2, NOT 0.2.2b, due to a WORKSPACE issue
• swig:
  • apt-get install swig on Ubuntu
  • brew install swig on OSX
• protocol buffers, with a version supported by TensorFlow:
  • check your protobuf version with pip freeze | grep protobuf1
  • upgrade to a supported version with pip install -U protobuf==3.0.0b2
• asciitree, to draw parse trees on the console for the demo:
  • pip install asciitree

Once you completed the above steps, you can build and test SyntaxNet with the following commands:

  git clone --recursive https://github.com/tensorflow/models.git
  cd models/syntaxnet/tensorflow
  ./configure
  cd ..
  bazel test syntaxnet/... util/utf8/...
  # On Mac, run the following:
  bazel test --linkopt=-headerpad_max_install_names \
    syntaxnet/... util/utf8/...

Bazel should complete reporting all tests passed.

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What Is the Difference: Viruses, Worms, Ransomware, Trojans, Bots, Malware, Spyware etc?

If you’re a regular or even an occasional computer user, then you might’ve heard the terms like Viruses, Worms, Trojans, Bots, Malware, Spyware, etc. But honestly speaking, we consider all these to be a Virus, no matter, whatever be their type. But have you ever tried to acknowledge, what is the difference between these terms, although they are meant to harm your device, steal your data or spy on you, have you ever thought why they are named so differently. Basically, terms like Viruses, Trojans are all types of malicious software or simply ‘Malware’.

Now, the first and foremost question arises, where did these terms came from?Clearly, they are not some out of the world aliens, in fact the real truth is that they were not even created with an intention to harm someone.

The history of malware attacks goes back to 1949, when John von Neumann, first developed the theoretical base for self-duplicating automation programs, but the technical implementation was not feasible at that time. The term ‘Computer Virus’ was first used by Professor Leonard M. Adleman in 1981, while in conversation with Fred Cohen.

The first computer virus named ‘Brain’ was coded by two brothers Basit Farooq Alvi and Amjad Farooq Alvi, who were from Lahore, Pakistan. Brain was meant to infect storage media based on MS-DOS FAT file systems. It was originally designed to infect the IBM PC, it replaced the boot sector of its floppy disk with the virus. The virus program changed the disk label to ©Brain and the defected boot sectors displayed this message:

Welcome to the Dungeon (c) 1986 Basit & Amjads (pvt) Ltd VIRUS_SHOE RECORD V9.0 Dedicated to the dynamic memories of millions of viruses who are no longer with us today – Thanks GOODNESS!! BEWARE OF THE er..VIRUS : this program is catching program follows after these messages….$#@%$@!!

However, as you may presume, there was no evil intention behind this. Alvi brothers said in their interview with TIME magazine, they created the virus only to protect their medical software from piracy, aimed at copyright infringement acts.

Coming back to Malware, these are malicious software designed to harm a computer which may or may not be connected to a network. Malware only get in to action when there is a computer involved in the game otherwise the term Malware is of no use.

Malware are of the following types:

Worms: These programs have the ability to replicate themselves. Their sole objective is to increase their population and transfer themselves to another computers via the internet or through storage media, all the work is done like a top secret mission hiding their movement from the user. They don’t cause any harm to the computer, their replicating nature consumes hard drive space, thus slow down the machine. Some of the notable worms are, SQL Blaster which slowed the internet for a small period of time, Code Red took down almost 359,000 websites.

Viruses: They also have the ability to replicate themselves, but they do damage files on the computer they attack. Their main weakness lies in the fact, they can get into action only if they have the support of a host program, otherwise they’re just like a defeated warrior. They stick themselves to songs, videos, and executable files and travel all over the internet. W32.Sfc!mod, ABAP.Rivpas.A, Accept.3773 are some of the examples of Virus programs.

The Virus Gang:

File Viruses
Macro Viruses
Master Boot Record Viruses
Boot sector Viruses
Multi-Partite Viruses
Polymorphic Viruses
Stealth Viruses

Feel free to Google anyone of them if you like.

Trojans: Basically, Trojans are no Viruses, and are not meant to damage or delete files on your system. Their sole task is to provide to a backdoor gateway for malicious programs or malevolent users to enter your system and steal your valuable data without your knowledge and permission. JS.Debeski.Trojan is an example of Trojan.

They are named after the ‘Trojan Horse’ tale, in which Greeks entered the city of Troy with the help of a wooden horse which was meant to be a gift, but turned out to be a sweet poison, as depicted in the movie Troy.

The Trojan Gang:

Remote Access Trojans
Data Sending Trojans
Destructive Trojans
Proxy Trojans
FTP Trojans
Security Software Disabler Trojans
Denial-Of-Service Attack Trojans

Feel free to Google anyone of them if you like.

Adware: Adware are used to display advertisements in the programs. They generally come attached with software programs that are free to use as they are the only source of revenue for the developers of those software programs. Adware can’t be completely called as Malware as they have no intention to harm your machine, they only track what advertisements you’re more interested in, so as to display the relevant advertisements on your screens.

Spyware: These programs also come attached with other freeware software, track your browsing and other personal details and send it to a remote user. They can also facilitate installation of unwanted software from the internet. Unlike Adware, they work as a standalone program and do their operations silently.

Spam: You get very irritated when you receive unwanted emails from unknown senders, these are called Spams or junk mails. And the process of flooding the internet with the same message is called Spamming, is done for the purpose of commercial advertising. These junk mails may sometimes contain Viruses or Trojans that enter your system as soon as you open the mail.

Bots: Bots or Robots are automated processes that are designed to interact over the internet without the need of human interaction. They can be used for good and bad intentions. An evil minded person can create a malicious Bot that is capable of infecting the host on its own. After transmitting itself to the host device, a Bot creates a connection with central servers which act as the command centers for the infected hosts attached to that network, called Botnet.

Their skills include stealing passwords, logging keystrokes, analyzing network traffic, relay spam, launch DoS (Denial of Service) attacks and open back doors on infected hosts. These Bots can be seen as the advanced form of Worms, their infection rate and tactic is more effective than those of Worms. These malicious Bots are created after a lot of hard work done by their malignant creators.

Ransomware: These type of malware alter the normal operation of your machine, thus barring you to use it properly. Thereafter, these programs display warning messages asking for money to get your device back to normal working condition.

After reading all this, you might be thinking why people create Malware. Here are some reasons which may compel a coder to write malware codes:

• Take control of a person’s computer for personal or professional reasons.
• To get financial benefits.
• To steel confidential data.
• To prove their point regarding a security breach can be done on a system.
• To take down an individual computer or a complete network.

and many more….

How can you protect your Computer :

• Keep your system up to date.
• Use genuine software.
• Install an antivirus software and update it regularly.
• Set-up a firewall, may it be custom as provided by antivirus software. Windows has an in-built firewall option in case you don’t want to use a custom firewall.
• Never open unknown emails that generally reside in your Spam folder.
• Never open unknown links, use online website safety checker tools if you’re not sure to open a website.

By taking these simple measures, you can effectively keep your machine free from Malware and other potential threats.

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Kali Linux (MITM ATTACK)

Today our tutorial will talk about Kali Linux Man in the Middle Attack. How to perform man in the middle attack using Kali Linux?we will learn the step by step process how to do this.
I believe most of you already know and learn about the concept what is man in the middle attack, but if you still don't know about this, here is some definition from wikipedia.

The man-in-the-middle attack (often abbreviated MITM, MitM, MIM, MiM, MITMA) in cryptography and computer security is a form of active eavesdropping in which the attacker makes independent connections with the victims and relays messages between them, making them believe that they are talking directly to each other over a private connection, when in fact the entire conversation is controlled by the attacker.

Scenario:
This is the simple scenario, and I try to draw it in a picture.

Victim IP address : 192.168.8.90
Attacker network interface : eth0; with IP address : 192.168.8.93
Router IP address : 192.168.8.8
Requirements:
1. Arpspoof
2. Driftnet
3. Urlsnarf

Step by step Kali Linux Man in the Middle Attack :

1. Open your terminal (CTRL + ALT + T kali shortcut) and configure our Kali Linux machine to allow packet forwarding, because act as man in the middle attacker, Kali Linux must act as router between "real router" and the victim. Read the tutorial here how to set up packet forwarding in linux.
2. You can change your terminal interface to make the view much more friendly and easy to monitor by splitting kali linux terminal window.
3. The next step is setting up arpspoof between victim and router.

arpspoof -i eth0 -t 192.168.8.90 192.168.8.8

4. And then setting up arpspoof from to capture all packet from router to victim.

arpspoof -i eth0 192.168.8.8 192.168.8.90

5. After step three and four, now all the packet sent or received by victim should be going through attacker machine.

6. Now we can try to use driftnet to monitor all victim image traffic. According to its website,

Driftnet is a program which listens to network traffic and picks out images from TCP streams it observes. Fun to run on a host which sees lots of web traffic.

7. To run driftnet, we just run this

driftnet -i eth0

When victim browse a website with image, driftnet will capture all image traffic as shown in the screenshot below.

To stop driftnet, just close the driftnet window or press CTRL + C in the terminal
8. For the next step we will try to capture the website information/data by using urlsnarf. To use urlsnarf, just run this code

urlsnarf -i eth0

and urlsnarf will start capturing all website address visited by victim machine.
9. When victim browse a website, attacker will know the address victim visited.

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