Ppt background of bitcoin virus

1.

Yesterday, I went to the electronic reading room. Not long after I plugged in the USB flash drive, the teacher suddenly asked everyone to unplug the USB flash drive. Some students found that all the files in the USB flash drive could not be opened, and there were two more documents asking for money

so everyone rushed to check, as long as the U disk inserted in the school computer were poisoned, large-scale computer poisoning occurred in the evening

a lot of people's information and graation thesis are in the computer. I really feel that hacker's behavior is disgusting. For the sake of money, regardless of the future of students, teachers' lifelong scientific research achievements...

hope to catch criminals as soon as possible and give them severe punishment by law

this virus will scan windows devices with open 445 file sharing port. As long as the user's device is on the Internet, hackers can implant blackmail software, remote control Trojan horse, virtual currency mining machine and other malicious programs in computers and servers

some security researchers point out that this large-scale network attack seems to be deployed through a worm application, and wannacry can spread among computers. What's more terrible is that unlike most malicious programs, this program can replicate and spread on its own in the network, and most of the current viruses still need to rely on the successful users to spread by cheating them to click the attachment with the attack code

the attack has affected 99 countries and as many as 75000 computers, but because the virus uses anonymous network and bitcoin anonymous transaction to obtain ransom, it is very difficult to track and locate the originator of the virus

2.

The virus in the "bitcoin virus" incident is known as "ransomware". By encrypting the files in the victim's computer, you can't open them completely to ask for ransom. This is a virus attack launched by lawless elements by using "eternal blue" leaked from NSA hacker's weapon library. It does not need any operation of users. As long as it is turned on and connected to the Internet, lawless elements can implant blackmail software into computers and servers

What's more terrible is that this is just the beginning. Now this blackmail virus has spread to all over the world, including many colleges and universities in China. You can see many students on the Internet showing pictures of their computers being attacked. I have to say that hackers are really well intentioned, even in simplified Chinese

3. 1. Reload the system, but the infected files cannot be recovered< Prevent file loss and virus invasion:
(1) data backup and recovery measures are the important work to recover the loss in the event of blackmail, so it is necessary to make remote backup of important file data in time to prevent losses caused by virus infection
(2) make sure the firewall is on
(3) don't open unknown email or link easily.

4. Wannacry virus is spread based on Windows system, and smartphone users will not be affected. To prevent viruses, please open the system control panel - system and security - install system patches. If you do not open the system patch function, please open and repair all vulnerabilities immediately. It is recommended to upgrade the system for systems below Windows 7. Thank you for your support and trust in Tencent housekeeper.

5. In the case of blackmail software infection, disk files will be encrypted by virus, which is difficult to crack by using high-strength encryption algorithm. Besides paying high ransom, the attackers often have no other way to decrypt the files. Only paying high ransom can they decrypt and recover the files, causing serious losses to learning materials and personal data
1. Install the latest security patch for your computer. Microsoft has released patch ms17-010 to fix the system vulnerability of "eternal blue" attack. Please install this security patch as soon as possible; For Windows XP, 2003 and other machines that Microsoft no longer provides security updates, we can use 360 "NSA Arsenal immune tool" to detect whether there are loopholes in the system, and close the ports affected by the loopholes, so as to avoid being infringed by blackmail software and other viruses
2. Close ports 445, 135, 137, 138 and 139, and close network sharing
3. Strengthen the awareness of network security: don't click the unknown link, don't download the unknown file, don't open the unknown email...
4. Back up the important files in your computer to the mobile hard disk and U disk as soon as possible (regularly in the future), and save the disk offline after the backup
5. It is recommended that users who are still using Windows XP or windows 2003 should upgrade to Windows 7 / windows 10 or windows 2008 / 2012 / 2016 as soon as possible.

6.

Hayek studied business cycle theory and monetary theory with his teacher Mises early in his academic career. In 1931, he published "price and proction". Because the proposition in the book is contrary to Keynes's "on money" published a year ago, they launched a debate

The most typical example of

is gold and silver. For a long time, gold and silver were the common currency in the world. The hard currency of trade in all countries did not belong to any one country. Even in the era of gold standard, the state issues legal paper money, but legal paper money is still anchored by the free competition of gold. Gold circulates freely in the world and is more rigid than paper money

There are at least three reasons that lead to the existence of a large number of competitive currencies:

one is the existence of multi-level market, because the metal currency is not easy to cut, super zero denomination currency and silver currency coexist

In the 18th and 19th centuries, there were long-standing high-ranking gold coins in Bangladesh, such as mulu, Sika rupee, middle akut rupee, and low ranking copper coins and BEIBI coins. Because silver coins are not easy to cut, a large number of shell coins with zero denomination are needed in remote areas and small exchange

this situation existed for a long time in ancient China, and the copper coin standard lasted for more than a thousand years in ancient China, but the iron coin also circulated for a long time (such as the Song Dynasty), and the face value of iron coin was smaller than that of copper coin. In the Qing Dynasty, with the discovery of Potosi silver mine in South America, a large number of silver coins flowed into China. Around 1730, the use of silver and money accounted for half of the transactions. Compared with copper coin, silver coin has a larger denomination, which is convenient for large transaction and solves the problem that copper coin is not easy to transport

The second is seasonal deflation, and private coins balance market demand

in the agricultural era, the transaction volume of agricultural procts accounted for a large proportion, and a large amount of money was used for agricultural procts transaction. However, agricultural procts have obvious seasonality, and the transportation and supply of metal money is extremely inconvenient, so the problem of insufficient money often appears in the harvest season. In his book, Professor Kuroda cites the example of Quanzhou, Fujian Province, China in 1606. The original inventory management money could not meet the rice trade, so the private money was imported to meet the market demand to balance supply and demand. This kind of situation happens every year in China. Every year, it is the peak of money demand near the Spring Festival. The central bank will release part of liquidity to balance supply and demand

Thirdly, metal currency is a kind of deflation currency, which circulates a variety of currencies in regional and specific areas

In his book, Professor Kuroda cites Nadina Jebel's case, "the transactions of grains such as rice are used for sonoto silver coins, the transactions of oils and fats are only used for French akote rupees or British akote rupees, and the transactions of flax are only used for French akote rupees."

At the beginning of the 20th century, in China, all kinds of silver coins were circulated in Jiujiang, Jiangxi Province. Mexican silver coins were used for the export of tea and porcelain procts in Shanghai, and silver coins issued locally in Jiangsu Province were used for the trade of local markets such as tobacco or beans. There are also silver bills used in Shanxi business circle, and various copper coins used in the coin community around the China Sea, including Japan, North Korea, Southeast Asia and other countries

the problems of metal currency in multi-level market, seasonal deflation, regionality and specific fields do not exist in today's credit currency era. Many of the competitive currencies listed by Professor Kuroda also disappeared in the globalization of silver coins and the legal tender system

therefore, the monetary pattern of countries in the world we see today is one country one currency, which is legally issued by the state monopoly

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7. Hello, the anti wana series of blackmailer Trojans introced on the Internet are as follows: first, download and patch to fix the system vulnerability in time; Then close 445 and other ports of network access, this is very important, can greatly prevent the invasion of the blackmailer Trojan horse, specific settings can be found online tutorial, a lot of. Finally, anti-virus software. Generally, our computers don't have anti-virus software. Take Tencent computer housekeeper as an example: turn on the housekeeper's active defense system. It can provide vulnerability defense, active interception, document protection, three layers of security protection, and file black detection, and prompt users to patch and repair vulnerabilities in time. I hope my answer can help you.

8. 1. Now that you have fixed this vulnerability directly, you don't have to worry about it.
2. Install a computer manager on your computer, then open the toolbox, find the function to fix the vulnerability, and go to repair it