The old lady of the landlady saw that the police controlled He Xingping, and she also walked in with a cane, looking at the old mobile phones all over the ground, the old lady was puzzled.

"Didn't you say you're in the online store business? You're reselling mobile phones?"

Seeing that He Xingping didn't speak, the old lady stepped forward directly and dialed the old mobile phone with the end of her crutches, and the whole person couldn't help but wonder: "There are so many elderly machines, why is there a charger on each elderly machine?"

"Old lady, this is not a charger. Lu Weiwei felt that the old lady should not have used a smartphone yet.

"It's not a charger, what are you doing on your phone?" the old lady snatched Gu Chen's lines.

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

"Uh......" He Xingping hesitated, and lowered his head.

Gu Chen didn't delay, he directly took out these old mobile phones and placed them neatly on the floor tiles in the living room.

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

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

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

He Xingping replied weakly: "Actually, I don't know much about this technique, and it was taught by another person." ”

"The other person, do you have accomplices?" asked Officer Wang.

"Yes, and it's an industrial chain, I'm just responsible for running errands to withdraw money, how to operate, in fact, I also have a family in Jiangnan City, I estimate that he lives near the community where the bank card was stolen. ”

"He can use sniffing technology to sniff out the victim's dynamic payment verification code within the range where the victim lives. ”

"What about after sniffing?" Gu Chen asked.

"Send this verification code to the washing channel, and the money will be paid. He Xingping said.

Gu Chen pointed to the equipment on the ground: "Then you have these devices?"

"I also want to master this technology and make more money like my last family, so with his help, I got some equipment and is still debugging. ”

Lu Weiwei held her chin and said thoughtfully: "Senior Brother Gu, Lao Wang, why haven't you heard of this sniffing technique? What is sniffing? How do people like them sniff out the victim's dynamic verification code?"

Officer Wang's head shook like a rattle: "I don't know this very well, it should be a new technology, right Gu Chen." ”

After pondering for a few seconds, Gu Chen hesitated a little and said, "I have seen relevant reports in the library's scientific magazines, but I didn't expect that two years have passed, and the problem of operators has not been solved." ”

"Do you know sniffing technology?" He Xingping said in disbelief when he heard this: "But my upline said that there are very few people who have mastered this technology at present, how do you know?"

Gu Chen snorted coldly, and also pointed to his head and said, "You will understand if you read more books, this is actually not a high-end technology." ”

"If I hadn't seen the equipment in your room, I wouldn't have remembered what I had seen in a science magazine. ”

Officer Wang and Lu Weiwei looked at each other, as if they felt that Gu Chen knew something.

Lu Weiwei hurriedly asked, "So Senior Brother Gu has seen relevant technologies in scientific magazines?"

"Yes, I think I saw it by chance at the city library half a year ago. Gu Chen half-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?"

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

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

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

Lu Weiwei on the side was a little puzzled and asked Gu Chen: "Then why did they choose this old model?"

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

"Uh...... Yes, yes, it's only 15 yuan to buy such a mobile phone, and it's quite a simple splicing process. He Xingping also confessed honestly.

Officer Wang was a little confused, took a Motorola 118 mobile phone, and put it in his hand to observe left and right, which was also unbelievable:

"Why? Why is it that such a cheap and simple sniffing device can intercept a large number of mobile phone text messages? Isn't this scientific?"

"No, no, it's scientific. Gu Chen directly retorted back, and said: "Senior Brother Wang, you must know that in the state of 2G, because the encryption technology is relatively simple, it is relatively easy to crack, or it is easy to crack. ”

"So when it comes to a network like 2G, what about sniffing technology, you can intercept this packet in the middle, and then untie it. ”

"That's it...... It's that simple?" Lu Weiwei said in disbelief when she heard this: "But what era are we now? How can we go back to the 2G network? ”

Gu Chen smiled: "Senior Sister Lu, although we have already fully entered the 4G era now, and some places in Jiangnan City have even used 5G. ”

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

"Ugh. Lu Weiwei was stunned for a moment, and then suddenly realized: "Yes, for example, when we visited the mountains before, the signal was not good, and 4G would become 2G, how could I forget this." ”

"That's not right. Officer Wang scratched the back of his head and retorted and asked: "Then Gu Chen, the community where Wang Guifang lives should be quite high-end, right? You can't say that the signal in that community is not good, I remember that 5G equipment is installed over there." ”

Gu Chen shook his head: "You only considered the objective existence, but you didn't consider the subjective issue. ”

Officer Wang and Lu Weiwei looked at each other, as if they didn't quite understand.

"Let's put it this way. Gu Chen walked to the middle of everyone, took the Motorola 118 equipment in Officer Wang's hand, and continued to explain:

"Some criminal suspects will use signal jamming equipment to interfere with a certain range of mobile phone signals. ”

"And at this time, the mobile phone signal of these users will also suddenly become a 2G signal. ”

Therefore, these criminal suspects will also take advantage of the loopholes in the 2G network to use sniffing equipment to absorb mobile phone signals within a certain range of the surroundings. ”

After the adsorption is successful, the victim's mobile phone number and SMS information will be automatically displayed on the suspect's computer. ”

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

"Quietly, they became the prey of the suspects. ”

"So that's the case? It turns out that the signal can also be interfered with?" Lu Weiwei was a little scared when she thought about it, and said: "I said that when I was sleeping before, why did the mobile phone signal suddenly weaken, and there was no network from time to time, and these people were interfering with the signal?"

"Well, I think that's the case too. When Officer Wang heard Lu Weiwei's words, he suddenly felt shocked: "And this situation usually happens at night, I thought it was the operator's signal maintenance, there will always be a certain period of time at night, suddenly there is no network, or the network is extremely poor." ”

"It stands to reason that there are very few people who go online at night, it should be that the Internet speed is faster, and the co-authors are all these people making trouble?"

Seeing that Officer Wang and Lu Weiwei were indignant, Gu Chen also smiled lightly and said: "Maybe, we don't rule out this possibility, after all, we don't know what the operator is doing." ”

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

"Once the mobile phone signal becomes 2G, then these criminal suspects will also take advantage of the loopholes in the 2G network to use sniffing equipment to absorb the mobile phone signal within a certain range of the surroundings. ”

Then, after success, the victim's mobile phone number and SMS information are automatically displayed on their computers. ”

"It's disgusting. Lu Weiwei looked at He Xingping in front of her, and suddenly felt that these people were enough chicken thieves.

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

"You'll have to ask him. Gu Chen pointed directly at He Xingping and said, "You say it yourself." ”

He Xingping lowered his head, and also cowered and said, "...... In fact, it is not difficult, we will put the mobile phone number, through a software, check your mobile phone number, whether you have registered on the major APP. ”

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

Because in today's society, mobile phone registration APP, that is a common practice, a mobile phone number can register a variety of accounts for different APP.

If he followed He Xingping's operation, Officer Wang felt a little dangerous.

He Xingping also nodded silently and continued to explain: "After this mobile phone number is registered, we will use this mobile phone number to log in to those APPs and log in through SMS verification codes, which involves the convenience of capturing dynamic verification codes through sniffing technology before." ”

"So, in order to transfer the money from the victim's bank card, we must obtain the user's name, ID number, bank card number, mobile phone number and dynamic verification code at the same time. ”

Gu nodded slightly and said: "So these five conditions, just like five keys, under normal circumstances, it is difficult for you to obtain, but because we have the victim's mobile phone number and can intercept the dynamic verification code in real time, we are like getting a master key, and we can get several other keys through the network." ”

"Yes. He Xingping nodded without hesitation and admitted: "With these things in hand, we can log in with an SMS verification code." ”

"And once you're logged in, all of your identity is in there. ”

"Then we will further investigate the personal information of these people, such as the online payment methods we usually use, as well as this certain treasure, various APP accounts. ”

"As long as it's related to real names, someone will look it up. ”

"Really?" Hearing He Junchao's remarks, Officer Wang directly took out his mobile phone and logged in to his account for actual verification.

Gu Chen and Lu Weiwei also leaned over and verified He Xingping's previous statements through Officer Wang's actual operation.

He Xing said indifferently: "What I said can't be wrong, you can go shopping casually, you can go to a treasure of yours, right? Then you can click on a travel project, and then, all the travel insurance, your name, ID number information is all there, all in it, isn't it?"

"It's really!" Officer Wang stared at He Xingping in front of him, feeling a little thoughtful and terrified.

With such a simple operation, all the background information of his APP can be displayed in front of the suspect, which stunned Officer Wang and Lu Weiwei.

Gu Chen continued to ask: "Then what do you do for some users who have not bought insurance, or who do not have registration information in a certain treasure?"

"This ...... Actually, it doesn't bother us. He Xingping took a deep breath, tried to calm down, and then continued to explain: "We will log in to this user's other apps at the same time. ”

"For example, in this APP, your birthday information will be displayed on it, and then another software can find your identity information, so that it can be pieced together. ”

"That's right. Lu Weiwei also admitted that through some tips, with a mobile phone number and SMS verification code, it is indeed possible to log in to the user's multiple social APP accounts.

By piecing together the information, it is indeed possible to grasp the user's more comprehensive information.

But this also involves a payment link, which is the most fatal.

So Lu Weiwei asked: "Many apps tend to deliberately hide a few digits from the user's bank card number, so how do you get the complete bank card number?

"It's not hard. Before He Xingping could speak, Gu Chen directly interrupted: "After they have other important information, they can get your bank card account number through a little trick." ”

"Tips?" Lu Weiwei was puzzled, and quickly asked again: "Senior Brother Gu, what ......do you mean?"

"You can do this by topping up. Gu Chen said.

He Xingping on the side was also stunned, feeling that Gu Chen seemed to have a clear understanding of this method,

couldn't help but give a thumbs up and said, "Comrade policeman, you are really amazing, you have thought of this." ”

Lu Weiwei reacted slowly, and she didn't understand what Gu Chen meant, so she changed her tone and asked He Xingping: "Then tell me, how do you play with the recharge method?"

"I ...... I'll just order a recharge method, recharge and payment methods immediately, can't I find your bank card?" He Xingping said.

"Yes, you can look up my card, but you can only see the last four digits of my card number. Of course, Lu Weiwei knows this kind of operation, and this is still not seeing all the digits of the bank card number.

He Xing said with a flat smile: "This may be the case for you, but for us, it is not difficult to know all the information of your bank card." ”

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

Taking out the two bank cards in his pocket, He Xingping explained: "Look, just like these two banks, I can get them directly through other apps, and you don't have to be surprised, this is not an invention I invented, it is such a way of operation." ”

"When we get the victim's name, ID number, mobile phone number, dynamic verification code, bank card number, we have to move on to the next step, which is to select the target of the crime. ”

"Do you want to choose?" Officer Wang was also shocked, feeling that the modus operandi of these thieves was far beyond his imagination.

He Xingping said with a bitter face: "Of course, just like picking radish and cabbage, we also need to spend time and energy, so we must check user information to see if there is any value in committing crimes." ”

Looking at Officer Wang's mobile phone, He Xingping gave an example on the spot: "For example, if I log in to your treasure account to see what you have bought, I will know your online orders if I look at your usual consumption habits." ”

"Just like just now, I see how many bank cards you have, and I look at your Huabei limit, credit limit, and various points. ”

"Another example is to go to the fast payment method, and the owner of this number can receive a balance SMS reminder. ”

"If that's the case, we can see whether the person has money or not. ”

Seeing that Officer Wang took a breath, He Xingping suddenly knew that Officer Wang was a poor ghost, so he said unscrupulously:

"Generally, after confirming the victim's basic information, we will use the victim's mobile phone number and dynamic verification code to transfer the victim's money again using passwordless payment. ”

"And you must know that many payments now do not require passwords, and verification codes are sufficient, so we use passwordless payments to withdraw the money with a fast payment method when we don't need a password. ”

"That should also have 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 are richer, 56,000, 100,000 can be made." ”

"What's more, even if you don't have money in your bank card, but you have a certain payment, a certain treasure, you have a Huabei borrowing, and what kind of white slips and so on. ”

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

"At this point, you don't do anything, and you only get a bunch of verification codes on your phone. ”

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

Listening to He Xingping's clear narration, Officer Wang and Lu Weiwei's faces were ugly.

It can be said that this modus operandi is silent and simply cannot be prevented.

Officer Wang was also glad that he had no money in his card and was not afraid of thieves.

Otherwise, once the mobile phone signal is interfered with by these gangs, the 4G and 5G signals will instantly become 2G, won't it be the end of the calf?

Now think about it when he was on duty late at night, the mobile phone signal suddenly became 2G, and Officer Wang is still a little afraid.

......