Chapter 800

The old lady of the landlord saw that he Xingping was under the control of the police. She walked in with a stick and looked at the old mobile phones everywhere. The old lady was puzzled.

"Don't you say you do online shop business? Are you a cell phone scalper? "

Seeing that he Xingping didn't speak, the old lady directly stepped forward and dialed the old mobile phone with the end of her crutches. The whole person couldn't help but wonder: "there are so many old-age machines, why are there chargers in each of them?"

"Old lady, this is not a charger." Lu Weiwei feels that the old lady hasn't used her smartphone yet.

"Not a charger? What do you do with your cell phone? " The old lady robbed Gu Chen's lines.

So Gu Chen also said: "yes, since these are not chargers, what are they?"

"Er..." He Xingping hesitated and lowered his head.

Without delay, Gu Chen took out these old mobile phones and put them on the floor tiles in the living room.

Later, Gu Chen found that the laptop under the old mobile phone was still hot.

After clicking on the page, I found that all kinds of information were being captured on the screen.

"He Xingping, how did you get this dynamic captcha?" Gu Chen asked him.

He Xingping weakly returned: "in fact, I don't know this technology very well. It was taught by another person."

"The other one, you have an accomplice?" Asked officer Wang.

"Yes, and it's an industrial chain. I'm only responsible for running errands and getting money. How to operate it? Actually, I have a family in Jiangnan City. I think he lives near the community where the bank card was stolen."

"He can sniff out the dynamic payment verification code of the victim by using sniffing technology within the scope of the victim's residence."

"What about after sniffing?" Asked Gu Chen.

"Send this verification code to Xi Qian channel, and you will pay out the money." He Xingping said.

Gu Chen pointed to the equipment on the ground: "what about your equipment?"

"I also want to keep up with home, master this technology and make more money, so with his help, I got some equipment and it's still in the process of debugging."

Lu Weiwei held her chin and said thoughtfully: "brother Gu, Lao Wang, why haven't you heard of this sniffer technology? What is sniffing? How do people like them sniff the victim's dynamic captcha? "

Officer Wang's head was shaking like a rattle: "I'm not very clear about this. It should be a new technology, right? Gu Chen."

After pondering for a few seconds, Gu Chen hesitated and said, "well, I have seen relevant reports in the science magazine of the library. I didn't expect that two years have passed and the problem of the operator has not been solved."

"Do you know sniffing technology?" When he Xingping heard the speech, he could not set up a channel: "but as I said on line, there are very few people mastering this technology. How can you know?"

Gu Chen snorted coldly, and pointed to his head and said: "read more books, you will understand. This is not really a high-end technology."

"If I hadn't seen the equipment in your room, I couldn't remember what I had seen in science magazine before."

Officer Wang and Lu Weiwei look at each other, as if Gu Chen knows something.

Lu Weiwei quickly asked, "so Gu has seen relevant technologies in science journals?"

"Yes, it should be half a year ago. I saw it by chance in the city library." Gu Chen squatted on the ground, picked up one of the old mobile phones and asked he Xingping: "this mobile phone should be an antique, what model is it?"

"Er, Mo Motorola 118. " He Xingping said.

"Yes, you should have made a transformation of Motorola 118 mobile phone, and then turn it into a receiving antenna. In combination with a specific USB disk system, after the computer is turned on, it can imitate the signal of the base station to intercept, which is equivalent to sniffing and detecting the mobile phone messages around."

"Yes, that's what my family said." He Xingping did not deny that he suddenly felt that the police in front of him were a little fierce.

One side of Lu Weiwei some doubts, asked Gu Chen: "then why do they choose this old model?"

"Because it's cheap and easy to operate." Gu Chen looked at he Xingping and asked, "is that right?"

"Er Yes, yes, it's only 15 yuan to buy such a mobile phone. It's quite a simple splicing process. " He Xingping is also honest.

Officer Wang was a little confused. He took a Motorola 118 mobile phone and put it in his hand for observation. He could not set the channel:

"why? Why is it that such a cheap and simple sniffer can intercept a large number of mobile phone messages? Isn't it scientific? "

"No, no, it's scientific." Gu Chen directly refuted and went back, and said: "brother Wang, you should know that in 2G state, because the encryption technology is relatively simple and easy to crack, or easy to crack."

"Well, when it comes to 2G network, sniffer technology can intercept this packet in the middle, and then untie it.""Just Is it that simple? " When Lu Weiwei heard the words, she could not set up a channel: "but what era are we in now? How is it possible to go back to 2G? That doesn't make sense

Gu Chen smiles: "sister Lu, although we have already entered the 4G era, and some places in Jiangnan City have even used 5g."

"But you should also know that in some places where 4G signal is not good, the mobile phone will switch to 2G network."

"Er." As soon as Lu Weiwei stayed, she suddenly realized: "yes, for example, when we visited the mountain area before, when the signal was not good, 4G would change to 2G. How can I forget this?"

"It's not right." Officer Wang scratched the back of his head and retorted, "Gu Chen, should Wang Guifang live in a high-end neighborhood? You can't say that the signal in that community is not good. I remember that 5g equipment is installed there. "

Gu Chen shakes his head: "you only consider the objective existence, but not the subjective problem."

Officer Wang and Lu Weiwei looked at each other face to face, but they didn't quite understand.

"Say so." Gu Chen walked to the center of the crowd and took the Motorola 118 equipment in the hands of Wang police officer. He continued to explain:

, "some suspect will use signal jamming equipment to interfere with mobile phone signals of a certain range."

"At this time, the mobile phone signals of these users will suddenly become 2G signals."

"so these suspect will also use the loopholes in 2G network to sniff the mobile phone's signals in a certain range."

after the successful adsorption, the victim's mobile phone number and SMS message will also automatically show on the suspect's computer.

Speaking of this, Gu Chen quickly called the old laptop, pointed to the screen and said, "it's like this, but the victim won't notice anything."

"they are the prey of suspect, who are silent."

"So it is? It turns out that the signal can also be jammed? " Lu Weiwei thought that she was a little scared and said: "I said that before I was sleeping, how could the mobile phone signal suddenly weaken, and there would be no network from time to time. These people are interfering with the signal when they cooperate with each other?"

"Well, I seem to have the same situation." Police officer Wang heard Lu Weiwei's words and suddenly felt shocked: "and this kind of situation usually happens at night. I thought it was the signal maintenance of the operator. At some time in the night, suddenly there was no network or the network was very poor."

"It's reasonable to say that there are few people who surf the Internet at night. It should be that the Internet speed is faster. It's all these people who are making trouble together?"

See Wang police officer and Lu Weiwei indignant, Gu Chen is also light smile said: "may be, also do not rule out this possibility, after all, what the operator is doing, we are not very clear."

"But it is certain that once the mobile phone signal is interfered, it is very likely to change from 4G or 5g state to 2G signal directly."

mobile phone mobile phone signal will be absorbed into the mobile phone signal within a certain range if the mobile phone signal becomes 2G, suspect will also use the loopholes existing in 2G network.

"Then, after success, the victim's mobile phone number and SMS message will be automatically displayed on their computers."

"It's disgusting enough." Looking at he Xingping in front of her, Lu Weiwei suddenly feels that these people are still chicken thieves.

But after thinking about it, it was a year of doubt: "even if they can get the mobile phone number and SMS information, how do they steal the money from Wang Guifang's bank card?"

You have to ask him Gu Chen pointed to he Xingping directly and said, "you can say it yourself."

He Xingping bowed his head, but also winced: "its In fact, it's not difficult. We will check your mobile phone number through a software to see if you have registered on major apps. "

"What if there is a registration? What would you do? " Officer Wang suddenly felt a sense of crisis.

Because in today's society, mobile phone registration app, the general practice, a mobile phone number can register different app accounts.

If he Xingping's operation is followed, officer Wang feels a little dangerous.

He Xingping also nodded silently and continued to explain: "after the mobile phone number is registered, we will use this mobile phone number to log in to those apps, and log in by SMS verification code. This involves the convenience of capturing dynamic verification code through sniffing technology before."

"so, if we want to transfer the money from the victim's bank card, we must get the name, ID card number, bank card number, mobile phone number and dynamic verification code."

Gu nodded slightly and said, "so these five conditions are like five keys. Under normal circumstances, it is very difficult for you to obtain them. However, with the mobile phone number of the victim and the ability to intercept the dynamic verification code in real time, we are just like getting a master key to obtain other keys through the network."

"Yes." He Xingping nodded unabashedly and admitted: "if we master these things, we can log in with SMS verification code.""And once you log in, all your identity information is in it."

"Then we will further investigate the personal information of these people, such as the online payment method we usually use, and this treasure, various app accounts."

"As long as it is related to real name, someone will check this thing."

"Really false?" Hearing hejunchao's words, officer Wang took out his cell phone directly and logged in his treasure account for practical verification.

Gu Chen and lvweiwei also relied on the past, and verified the previous statements by the actual operation of officer Wang.

He Xingping said: "I said that it is not wrong, you can stroll around, can you stroll into your treasure inside? Then you can open a travel item, then all the travel insurance, your name, ID number information are all there, all in it, right? "

"It's true!" Officer Wang stared at hexingping in front of him, feeling a little bit of thinking very afraid.

on such a simple operation, his APP background information can even be displayed in front of the suspect, this operation shocked Wang police officer and Lu Weiwei.

Gu Chen continued to chase and ask: "so if for some users who have not bought insurance or have no registration information in a treasure, how do you operate it?"

"This It's hard to beat us. " He Xingping breathes deeply, tries to calm down his mood, and continues to explain: "we will log in to other apps of this user at the same time."

"For example, on this app, your birthday information will be displayed, and then another software can find your identity information, so that you can piece it together."

"That's right." Lvivy also admitted that with some tips, using mobile phone numbers and SMS verification codes, it is true that users can log in to multiple social app accounts.

Through the information pieced up, it can really grasp the more comprehensive information of users.

But it also involves a payment link, which is the most deadly.

So luweiwei asked: "many apps often hide a few digits from the user's bank card number, so how do you get the complete bank card number? How do you know my bank card number? "

"It's not difficult." Before he Xingping opens up, Gu Chen directly interrupts: "after they have mastered other important information, they can get your bank card account number through a little skill."

"Tips?" Luweiwei was puzzled and asked again: "brother Gu, you mean..."

"You can recharge by charging." Gu Chen said.

He Xingping was also shocked. He felt that Gu Chen had a clear understanding of this method,

he said, "Comrade police, you are really powerful. This is all your thoughts."

Luweiwei responded slowly and half a dozen times, and didn't understand Gu Chen. She asked him again: "so, how do you play with the recharge mode?"

"I I will order a recharge method at any time, and I will pay immediately. Can I check your bank card? " He Xingping said.

"Yes, you can find my card, but you can only see the four digits behind my card number." Of course, lvivy knows this operation, which is still not able to see all the numbers of the bank card number.

"This may be the case for you, but it's not very difficult for us to know all the information about your bank card," he said with a smile

"I know you have this bank card, I can run your card, and I can run your card through script, on the computer."

"You see, like these two banks, I can get them directly through other apps. You don't be surprised. This is not what I invented or created, or this is such an operation way," he explained

Name: ID number, mobile phone number, dynamic verification code, bank card number, and so on. We will go to the next step.

"And pick?" Officer Wang is also surprised. He feels that the crime techniques of these thieves are far beyond his imagination.

"Of course, like picking radish and cabbage, we also need to spend time and energy, so we must check the user information to see if there is any value for committing crimes," he Xingping said

Looking at the phone of officer Wang, he Xingping gave an example on the spot: "for example, I log in to your treasure account, see what you have bought. I see your usual consumption habits, and I know your online order."

"Just like just now, I see how many bank cards you have. I see the amount you spend, the credit line, the situation of various points."

"For example, to pay quickly, the number machine owner can receive the balance SMS reminder."

"If so, we can see whether the man has money or no money."

Seeing officer Wang, he Xingping immediately knew that he was a poor man, and he said recklessly:"After we have determined the basic information of the victim, we will use the mobile phone number of the victim again, add the dynamic verification code, and use secret free payment to transfer the victim's money."

"What's more, you should know that many payments don't need a password, but a verification code is OK. We just pay through no secret, and when we don't need a password, we will take these money away by a quick payment method."

"There should also be a payment limit." Gu Chen said casually.

He Xingping nodded and said, "yes, there is a limit. For example, a verification code can be transferred to 4999. Some of them are relatively rich. They can be made of 56000 and 100000 yuan."

"What's more, even if you don't have money in your bank card, you have some payment, some treasure, you have some flowers to borrow, and some white notes and so on."

"Then, at this time, we can take out the money for you."

"At this time, you have nothing to do, and only a pile of verification codes will be received on your mobile phone."

"After that, the money on the bank card will be transferred away..."

Listen to he Xingping's clear narration, officer Wang and Lu Weiwei look ugly.

It can be said that this kind of criminal method is silent, which is impossible to prevent.

Police officer Wang is also glad that he has no money in his card, so he is not afraid of thieves.

Otherwise, once the mobile phone signal is interfered by these gangs, 4G and 5g signals will turn into 2G instantly, then it will be over?

Now, when I was on duty late at night, the mobile phone signal suddenly turned into 2G. Officer Wang is still a little scared.

……

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