Techbook

Hacking is the act of finding the possible entry points that exist in a computer  system or a computer network and finally entering into them. Ethical hacking is key to strengthening network security, and it's one of the most  desired skills for any IT security professional.   A computer expert who does the act of hacking is called a "Hacker". Hackers are those who seek knowledge, to understand how systems operate,  how they are designed, and then attempt to play with these systems.   Hacking is usually legal as long as it is being done to find weaknesses in a computer  or network system for testing purpose.   This sort of hacking is what we call Ethical Hacking .    Hacking comes in many colours:- White  Grey  Black Shades in between

ImageSource JIGSAW RANSOMWARE This ransomware was first spotted in April 2016. A notorious virus that disables the computer and encrypts the files on it and threatens to delete them, is actually the first one that carries out this threat. Once the virus invades the system a countdown timer starts and if the demanded ransom of $150 is not paid within first hour it deletes one file and continues deleting as the timer resets every 60 minutes deleting more and more files. JIGSAW virus encrypts files using AES-128-CBC and creates a secret decryption key, which is needed to decrypt all these encrypted files. Jigsaw malware creates a number of problems:- Jigsaw drops other type of infections in order to invade your system deeply. Spam files and registries are injected on to your device. A lot of pop-up ads come out on the screen. Slows down system’s performance.

  ImageSource TeslaCrypt now defunct was a ransomeware Trojan that first came into light in late February 2015. TeslaCrypt was distributed widely via the Angler exploit kit. It exploited AdobeFlash (CVE-2015-0311) and hence downloads the TeslaCrypt. Initially TeslaCrypt targeted game’s-play data for computer games like the  Call of Duty series, World of Warcraft, Mine-Craft & World of Tanks. Newer variants of TeslaCrypt were not only focused on games but also encrypted Word, PDF, JPEG and other files. In all cases, the victim would then be prompted to pay a ransom of $500 worth of BitCoins in order to obtain the key to decrypt the files.