When the old lady of the landlord saw the police restraining He Xingping, she also walked in with a cane. Looking at the old mobile phones on the floor, the old lady couldn't help but become confused.
"Didn't you say you are in the online store business? Are you reselling mobile phones?"
Seeing that He Xingping didn't speak, the old lady stepped forward and dialed the old mobile phone with the end of her crutch. She couldn't help but wonder: "There are so many senior phones, why is there a charger plugged into every senior phone?"
"Old lady, this is not a charger." Lu Weiwei felt that the old lady probably hadn't used a smartphone yet.
"It's not a charger? What are you doing plugging in the phone?" The old lady stole Gu Chen's line.
So Gu Chen also said casually: "Yes, if these are not chargers, then what are they?"
"Uh..." He Xingping hesitated for a moment and lowered his head.
Gu Chen didn't waste any time and directly took out these old mobile phones and placed them neatly on the floor tiles of the living room.
Then Gu Chen discovered that the laptop placed under the old mobile phone was still hot.
After clicking on the page, I found that various information was being captured on the screen.
"He Xingping, how did you obtain this dynamic verification code?" Gu Chen asked him.
He Xingping returned weakly: "Actually, I don't understand this technique very well. It was all taught by another person."
"Another person, do you have an accomplice?" Officer Wang asked.
"Yes, and it is an industrial chain. I am only responsible for running errands and withdrawing money. How to operate it specifically? In fact, I have a boss in Jiangnan City. I guess he lives near the community where the bank card was stolen."
"He can use sniffing technology to sniff 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 money laundering channel and the money will be paid out." He Xingping said.
Gu Chen pointed to the equipment on the ground: "What about your equipment?"
"I also want to master this technology and make more money like my family, so with his help, I got some equipment and am still debugging it."
Lu Weiwei held her chin and said thoughtfully: "Junior brother Gu, Lao Wang, why haven't you heard of this sniffing technology? What is sniffing? How do people like them sniff the victim's dynamic verification code?
"
Officer Wang shook his head like a rattle: "I'm not sure about this, it should be a new technology, right Gu Chen."
After Gu Chen thought for a few seconds, he hesitated and said: "I saw relevant reports on this in the library's science magazine. I didn't expect that two years have passed and the operator's problem has not been solved."
"Do you know about sniffing technology?" He Xingping said in disbelief when he heard this: "But my supervisor said that there are very few people who have mastered this technology. How do you know?"
Gu Chen snorted coldly, pointed at his head and said: "Read more and you will understand. This is actually not a high-end technology."
"If I hadn't seen these devices in your room, I really wouldn't have been able to remember what I had read in scientific magazines before."
Officer Wang and Lu Weiwei looked at each other, as if they felt that Gu Chen knew something.
Lu Weiwei quickly asked: "So Junior Brother Gu has seen related technologies in science magazines?"
"Yes, I should have seen it by chance in the city library half a year ago." Gu Chen squatted on the ground, picked up one of the old mobile phones and asked He Xingping: "This mobile phone must be an antique. Is it
What model?"
"Uh, Motorola...Motorola 118." He Xingping said.
"Yes, you should have modified the Motorola 118 mobile phone, and then turned it into a receiving antenna, and coupled with a specific USB flash drive system, after the computer is turned on, it can imitate the base station signal to intercept, which is equivalent to
Sniff and detect text messages on surrounding mobile phones."
"Yes, that's what my boss said." He Xingping did not deny it, but suddenly felt that the police in front of him was a bit powerful.
Lu Weiwei on the side was a little confused 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, "right?"
"Uh... yes, yes, it only costs 15 yuan to buy a mobile phone like this. It is quite a simple splicing process." He Xingping also explained honestly.
Officer Wang was a little confused. He took a Motorola 118 mobile phone, put it in his hand and looked around, and said in disbelief:
"Why? Why can such a cheap and simple sniffing device intercept a large number of mobile phone text messages? Isn't this unscientific?"
"No, no, this is very scientific." Gu Chen retorted directly and said: "Brother Wang, you have to know that in the 2G state, because the encryption technology is relatively simple, it is easier to crack, or it is very easy
Cracked.”
"Then when it comes to a network like 2G, sniffing technology can intercept the data packet in the middle and then decrypt it."
"Just... is it that simple?" Lu Weiwei heard this and said in disbelief: "But what era are we in now? How can we return to the 2G network? This cannot be justified."
Gu Chen smiled: "Senior Sister Lu, although we have already fully entered the 4G era, and some places in Jiangnan City have even used 5G."
"But you also need to know that in some places where the 4G signal is not good, the mobile phone will switch to the 2G network."
"Uh." Lu Weiwei was stunned for a moment, then suddenly realized: "Yes, for example, when we visited the mountainous area before, if the signal was not good, 4G would become 2G. How could I have forgotten this?"
"That's not right." Officer Wang scratched the back of his head and retorted: "Gu Chen, the community where Wang Guifang lives should be quite high-end, right? You can't possibly say that the signal in that community is not good. I remember that there are
5G equipment is being installed.”
Gu Chen shook his head: "You only considered objective existence, but did not consider subjective issues."
This chapter is not over yet, please click on the next page to continue reading! Officer Wang and Lu Weiwei looked at each other, as if they didn’t understand.
"Let's put it this way." Gu Chen walked to the middle of everyone, took the Motorola 118 device from Officer Wang's hand, and continued to explain:
"Some criminal suspects will use signal interference equipment to specifically interfere with mobile phone signals within a certain range."
"At this time, the mobile phone signals of these users will suddenly change to 2G signals."
"So these criminal suspects will also take advantage of the loopholes in the 2G network and use sniffing equipment to absorb mobile phone signals within a certain range around them."
"After the adsorption is successful, the victim's mobile phone number and text messages will automatically be displayed on the suspect's computer."
Having said this, Gu Chen quickly opened the old laptop, pointed at the screen and said, "It's like this, but the victim won't notice anything."
"They quietly became prey for criminal suspects."
"So that's it? So the signal can be interfered with?" Lu Weiwei was a little scared when she thought about it, and said: "I said before that when I was sleeping, the mobile phone signal would suddenly weaken, and there would be no network from time to time. These are the people who co-authored it.
Jamming the signal?"
"Well, I seem to have this situation too." 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 operator's signal maintenance. It always happens at night.
During a certain period of time, there is suddenly no network, or the network is extremely poor."
"Logically speaking, there are very few people surfing the Internet at night. It should be because the Internet speed is faster. Are these people causing trouble?"
Seeing that Officer Wang and Lu Weiwei were aggrieved, Gu Chen also smiled lightly and said: "That may be the case, and this possibility cannot be ruled out. After all, we don't know very well 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 4G or 5G state directly to 2G signal."
"Once the mobile phone signal changes to 2G, these criminal suspects will also take advantage of the loopholes in the 2G network and use sniffing equipment to absorb the mobile phone signals within a certain range around them."
"Then, upon success, the victim's mobile phone number and text messages are automatically displayed on their computer."
"It's really abominable." Lu Weiwei looked at He Xingping in front of her, and suddenly felt that these people were quite thieves.
But after thinking about it, he looked confused: "But even if they could obtain the mobile phone number and text message information, how did they secretly swipe the money from Wang Guifang's bank card?"
"You have to ask him about this." Gu Chen pointed directly at He Xingping and said, "You have to say it yourself."
He Xingping lowered his head and said timidly: "It...it's actually not difficult. We will use a software to check whether your mobile phone number has been registered on any major APP."
"What if there is registration? What will you do?" Officer Wang suddenly felt a sense of crisis.
Because in today's society, it is a common practice to register an APP with a mobile phone. One mobile phone number can register various accounts for different APPs.
If He Xingping's actions were followed, Officer Wang would feel a little dangerous.
He Xingping also nodded silently and continued to explain: "After registering this mobile phone number, we will use this mobile phone number to log in to those apps and log in through SMS verification codes. This involves the convenience of capturing dynamic verification codes through sniffing technology.
Already."
"So, in order to transfer the money on the victim's bank card, we must also obtain the user's name, ID number, bank card number, mobile phone number and dynamic verification code."
Gu Chen nodded slightly and said: "So these five conditions are like five keys. Under normal circumstances, it is difficult for you to obtain them, but because you have the victim's mobile phone number and can intercept the dynamic verification code in real time, you can
It's like getting a master key and you can get several other keys through the Internet."
"Yes." He Xingping nodded without hesitation and admitted: "After mastering these things, we can log in using the SMS verification code."
"And once you log in, all your identity information is 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 and various APP accounts."
"As long as it's related to real names, someone will check it."
"Is it true?" After hearing He Junchao's words, Officer Wang directly took out his mobile phone and logged into his account on a certain mobile phone to conduct actual verification.
Gu Chen and Lu Weiwei also leaned over and verified He Xingping's previous words through Officer Wang's actual operations.
He Xingping said calmly: "What I said is not wrong. If you just browse around, you can find some of your treasures, right? Then you can click on a travel item, and then, all travel insurance, your name
, I have all the ID number information, it’s all in there, right?”
"It's true!" Officer Wang stared at He Xingping in front of him, feeling a little worried.
With such a simple operation, all the background information of his APP can be displayed in front of the criminal suspect. This operation shocked Officer Wang and Lu Weiwei.
Gu Chen continued to ask: "Then how do you operate for some users who have not purchased insurance or have no registration information in a certain treasure?"
"This... actually is not a problem for us." He Xingping took a deep breath, tried to calm down, and continued: "We will log in to multiple other apps of this user at the same time."
"For example, your birthday information will be displayed on this APP, and then another software can check your identity information, so that it can be pieced together."
"This is correct." Lu Weiwei also admitted that through some tricks, using mobile phone numbers and SMS verification codes, it is indeed possible to log in to multiple social APP accounts of users.
By piecing together the information, the user can indeed grasp more comprehensive information.
But this also involves a payment link, which is the most important thing.
So Lu Weiwei asked again: "Many APPs often deliberately hide a few digits from users' bank card numbers, so how do you get the complete bank card number? How do you know my bank card number?"
"This is not difficult." Before He Xingping could say anything, Gu Chen interrupted directly: "After they have mastered other important information, they can obtain your bank card account number with a little trick."
"Little tricks?" Lu Weiwei was puzzled and quickly asked: "Junior brother Gu, you mean..."
"You can recharge." Gu Chen said.
He Xingping on the side was also shocked, feeling that Gu Chen seemed to have a clear understanding of this method.
He couldn't help but give a thumbs up and said: "Comrade police, you are really awesome, you have thought of all this."
Lu Weiwei reacted slowly, not understanding what Gu Chen meant, so she changed her question and asked He Xingping: "Tell me, how do you use the recharge method?"
"I... I just click on any recharge method, recharge and pay immediately, can't I check your bank card?" He Xingping said.
"Yes, you can check my card, but you can only see the last four digits of my card number." Of course Lu Weiwei knows this operation, but you still can't see all the digits of the bank card number.
He Xingping said with a smile: "This may be like this for you, but for us, it is not difficult to know all your bank card information."
"I know you have a card from this bank, so I can run your card. 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 bank cards, I can directly obtain them through other APPs. Don't be surprised. I didn't invent this."
What is created is such a method of operation.”
"After we obtain the victim's name, ID number, mobile phone number, dynamic verification code, and bank card number, we have to move to the next step, which is to select the target of the crime."
"You still have to choose?" Officer Wang was also shocked. He felt that the criminal methods of these thieves were far beyond his imagination.
He Xingping said with a bitter face: "Of course, just like picking radishes and cabbage, we also need to spend time and energy, so we must check the user information to see if it has any crime value."
Looking at Officer Wang's cell phone, He Xingping gave an example on the spot: "For example, if I log in to your Xubao account and see what you have bought, and if I see your usual consumption habits, I will know your online orders."
"Just like just now, I looked at how many bank cards you have, and I looked at your Huabei limit, credit limit, and various points."
"Another example is the quick payment method. The owner of this number can receive a balance text message reminder."
"If that's the case, we'll be able to see whether the person has money or not."
Seeing Officer Wang let out a long breath, He Xingping immediately knew that Officer Wang was a poor man, so he said unscrupulously:
"Generally, after we determine the victim's basic information, we will again use the victim's mobile phone number, add a dynamic verification code, and use password-free payment to transfer the victim's money."
"And you have to know that many payments now do not require a password, just a verification code. We use password-free payment. When a password is not required, the money can be withdrawn using a quick payment method."
"There should 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 the richer ones can get it for 50,600, 60,000 or 100,000."
"Also, even if you don't have any money in your bank card, but you have a certain payment, a certain treasure, you can borrow it if you have flowers, and there are other things like IOUs."
"Then at this time, we can get the money for you."
"At this time, you have done nothing and will only receive 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 story, Officer Wang and Lu Weiwei looked ugly.
It can be said that this method of committing crimes is silent and impossible to prevent.
Officer Wang was also thankful that he had no money in his card and was not worried about thieves.
Otherwise, once the mobile phone signal is interfered by these gangs, and the 4G and 5G signals instantly become 2G, wouldn’t it be the end of the world?
Now thinking about when he was on duty late at night, the mobile phone signal suddenly changed to 2G, Officer Wang is still a little scared.
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