how ransom-ware encryption works and how does ransomware get on your computer and how ransomware virus works and how prevent ransomware
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LavanaThomson,United Kingdom,Professional
Published Date:15-07-2017
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HOW RANSOMWARE WORKS Ransomware is Gaining Momentum Just What is Ransomware? Over the past three years, ransomware has jumped Ransomware is a malicious software that allows a into the spotlight of the cyber threat landscape. hacker to restrict access to an individual’s or company’s The FBI projects ransomware attacks to yield more vital information and then demands some form of 1 than 1B in 2016. payment (usually Bitcoins) to lift the restriction. 1 209 million Amount paid in Q1 2016 to cyber-criminals using ransomware 1 FBI estimate for losses to be incurred in 2016 due to ransomware 1 billion Time from initial infection to a ransom demand 15min 72% Percent of companies affected by ransomware that could not access data for at least 2 days 10–50 million 4 following the attack Estimated monthly income 32% for cybercriminals Percent that lost access to their 3 4 from ransomware data for 5 days or more 86% 47% Attacks that affected 2 Attacks that affected more 4 4 or more employees than 20 employees 17,000 100,000 Amount paid by the Hollywood Amount the hospital was losing Presbyterian Medical Center in PER DAY just on its inability to 5 2016 to unlock files and return perform patient CT scans 5 to business as usual 1 CNN-Money,, April 15, 2016 2 Security Magazine, "'Ransomware' Attacks to Grow in 2016," November 23, 2016 3 David Common, CBC News, "Ransomware: What You Need to Know," March 11, 2015 4 Intermedia blog post, "When ransomware strikes your business, are you prepared? Our new report findings may surprise you.", March 17, 2016 5, " City Held Hostage — Via Bitcoin Ransomware," March 22, 2016 50 millionTHE 5 PHASES of a Ransomware Attack There are 5 distinct phases of a ransomware attack. The timeline of an attack is very compressed. You often Understanding what happens at each phase and have as little as 15 minutes from the exploitation and recognizing the indicators of compromises (IOCs) infection to receiving the ransom note. Recognizing the can increase your likelihood of successfully defending early indicators is critical to your success in stopping against—or at least mitigating the effect of—an attack. an attack. Phase 1: Exploitation and Infection (T –00:00) 1 In order for an attack to be successful, the malicious ransomware file needs to execute on a computer. This is often done through a phishing email or an exploit kit. In the case of the CryptoLocker malware, the Angler Exploit Kit is a preferred method to gain execution. Phase 2: Delivery and Execution (T –00:05) 2 During this phase, the actual ransomware executables are delivered to the victim’s system. Upon execution, persistence mechanisms will be put into place. Phase 3: Backup Spoliation (T –00:10) 3 A few seconds later, the ransomware targets the backup files and folders on the victim’s system and removes them to prevent restoring from backup. This is unique to ransomware—other types of crimeware don’t bother to delete backup files. Phase 4: File Encryption (T –02:00) 4 Once the backups are completely removed, the malware will perform a secure key exchange with the command and control (C2) server, establishing those encryption keys that will be used on the local system. Phase 5: User Notification and Cleanup (T –15:00) 5 With the backup files removed and the encryption dirty work done, the demand instructions for extortion and payment are presented. Quite often, the victim is given a few days to pay. After that time, the ransom increases. Finally, like the Mission Impossible recordings that self destruct, the malware cleans itself off the system so as not to leave behind significant forensic evidence that would help to build better defenses against the malware. Ransomware attacks are just starting to ramp up. Because these attacks are so lucrative for the perpetrators, they are certain to become more common, more damaging and more expensive. Your organization’s success in defending against a ransomware attack is largely dependent on your level of preparation and the tools you deploy to monitor your systems to detect, respond to and neutralize suspicious activity. Learn how you can quickly detect and neutralize a ransomware attack at

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