I am a super cop

Chapter 800 Sniffing [Dragon Boat Festival Ankang]

Seeing the police controlling He Xingping, the old lady of the landlady walked in with a cane. Looking at the old mobile phones all over the floor, the old lady couldn't help feeling suspicious.

"Didn't you say that 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 wondering, "There are so many elderly phones, why is there a charger plugged into each of them?"

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

"It's not a charger? Then what do you do with your phone?" The old lady snatched Gu Chen's lines.

So Gu Chen also said by the way: "That's right, since these aren't chargers, what are they?"

"Uh..." He Xingping hesitated for a moment, lowering his head.

Without delay, Gu Chen directly took out these old mobile phones and placed them neatly on the floor tiles in 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 get this dynamic verification code?" Gu Chen asked him.

He Xingping replied weakly: "Actually, I don't understand this technique very well, it was taught by another person."

"Another person, do you have an accomplice?" Officer Wang asked.

"Yes, and it's an industrial chain. I'm just in charge of running errands to withdraw money. How to operate it? In fact, I have a family in Jiangnan City. I guess he lives near the community of the person whose 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: "Then your equipment?"

"I also want to master this technology and make more money just like my previous family, so with his help, I got some equipment and is still in the process of debugging."

Lu Weiwei rested her chin and said thoughtfully, "Junior Brother Gu, Old Wang, why haven't I 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 very clear about this, it should be a new technology, right Gu Chen."

After pondering for a few seconds, Gu Chen hesitated and said, "I've read related reports about this in the library's science journals. I didn't expect that two years have passed, and the problem of the operator has not been resolved."

"Do you know sniffing technology?" He Xingping couldn't believe it when he heard the words, "But my upline said that very few people have mastered this technology. How do you know?"

Gu Chen snorted coldly, pointed to his own head and said, "You will understand after reading more books, this is actually not a high-end technology."

"If I hadn't seen these devices in your room, I really couldn't remember what I saw in the science magazine before."

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

Lu Weiwei hurriedly asked: "So Junior Brother Gu has seen related technologies in science magazines?"

"Yes, it should be half a year ago. I saw it by accident 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, is it What model?"

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

"Yes, you should have modified the Motorola 118 mobile phone, and then turned it into a receiving antenna, coupled 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 text messages from surrounding phones."

"That's right, that's what my family said." He Xingping didn't deny it, and suddenly felt that the policeman in front of him was a bit tough.

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 only costs 15 yuan to buy such a mobile phone, and it is quite a simple splicing process." He Xingping also confessed honestly.

Officer Wang was a little confused. He took a Motorola 118 mobile phone and put it in his hand to look around. He couldn't believe it:
"Why? Why is such a cheap and simple sniffing device able to intercept a large number of mobile phone text messages? Isn't this unscientific?"

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

"Then when it comes to a network like 2G, sniffing technology can intercept this data packet in the middle, and then untie it."

"It's...it's that simple?" Lu Weiwei couldn't believe it when she heard the words, "But what era are we in now? How can we go back to the 2G network? It doesn't make sense."

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, and then suddenly realized: "That's right, for example, when we were visiting in the mountains before, when the signal was not good, 4G would change to 2G. How could I forget this?"

"That's not right." Officer Wang scratched the back of his head, retorted and asked: "Then Gu Chen, the neighborhood where Wang Guifang lives should be quite high-end, right? You can never say that the signal in that neighborhood is not good. 5G equipment is being installed."

Gu Chen shook his head: "You only considered objective existence, but did not consider subjective issues."

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 device from Police Officer Wang, and continued to explain:

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

"At this time, the mobile phone signals of these users will suddenly become 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 SMS information will be automatically displayed on the suspect's computer."

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

"In silence, they became the prey of criminal suspects."

"So that's the case? It turns out that the signal can also be interfered?" Lu Weiwei was a little scared after thinking about it, and said: "I said that when I was sleeping, why the mobile phone signal would suddenly weaken, and there would be no network from time to time. These people are the co-authors Interfering with the signal?"

"Uh, I seem to have this kind of situation too." Hearing Lu Weiwei's words, Police Officer Wang suddenly felt startled: "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, suddenly there is no network, or the network is extremely poor.”

"It stands to reason that there are very few people surfing the Internet at night. It should be because the speed of the Internet is faster. Is this group of people doing tricks?"

Seeing that Police Officer Wang and Lu Weiwei were aggrieved, Gu Chen also smiled and said, "Maybe so, and I don't rule out this possibility. After all, we don't know what the operators are doing."

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

"Once the mobile phone signal becomes 2G, then these criminal suspects will also take advantage of the loopholes in the 2G network and use sniffing equipment to absorb the mobile phone signal 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 detestable." Lu Weiwei looked at He Xingping in front of her, and suddenly felt that this group of people was quite thieves.

But after thinking about it, he looked puzzled: "But even if they can obtain the mobile phone number and SMS information, how did they secretly swipe the money from Wang Guifang's bank card?"

"You have to ask him." Gu Chen pointed at He Xingping directly, and said, "You tell yourself."

He Xingping lowered his head and said timidly, "Actually...it's not difficult. We will use a software to check your mobile number and see if it has been registered in any 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, it is a common practice to register APPs with mobile phones. One mobile phone number can register various accounts of different APPs.

According to He Xingping's operation, Officer Wang felt 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 through SMS verification codes. This involves the convenience of capturing dynamic verification codes through sniffing technology. gone."

"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, so you 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 with the SMS verification code."

"And once you log in, all your identity information is in there."

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

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

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

Gu Chen and Lu Weiwei also leaned over to verify He Xingping's previous words through the actual operation of Police Officer Wang.

He Xingping said flatly: "I'm not wrong. You can browse around in your treasure, right? Then you can click on a travel item, and then, all travel insurance, your name , the ID number information is all there, it’s all in there, isn’t it?”

"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 my APP can be displayed in front of the criminal suspect. This wave of operations stunned Police Officer Wang and Lu Weiwei.

Gu Chen continued to ask: "Then how do you deal with some users who have not bought insurance or have no registration information in a certain treasure?"

"This... actually won't bother us." He Xingping took a deep breath, tried to calm down, and continued to explain: "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 find your identity information, so that it can be pieced together."

"That's right." Lu Weiwei also admitted that through some tricks, using the 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 information, it is indeed possible to grasp more comprehensive information about users.

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

So Lu Weiwei asked again: "Many apps often hide a few digits of the user's bank card number deliberately, 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 could speak, Gu Chen interrupted directly: "After they have other important information, they can definitely obtain your bank card account number with a little trick."

"Small tricks?" Lu Weiwei was puzzled, and hurriedly asked again: "Junior Brother Gu, you mean..."

"You can recharge through the phone." Gu Chen said.

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

He couldn't help but gave a thumbs up and said: "Comrade policeman, you are really amazing, you have thought of all this."

Lu Weiwei's reaction was a bit slow, and she didn't understand what Gu Chen meant, so she asked He Xingping instead: "Then tell me, how do you play with the recharge method?"

"I... I just click on any recharge method, recharge and payment method immediately, can't I check 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 knew about this operation, but she still couldn't see all the digits of the bank card number.

He Xingping smiled and said: "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, so 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 bank cards, I can get them directly through other apps. Don't be surprised, this is not my invention. What was created was such a method of operation.”

"After we have obtained the victim's name, ID number, mobile phone number, dynamic verification code, bank card number and other information, we have to go to the next step, which is to select the target of the crime."

"I still have 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 it is worth committing a crime."

Looking at Police Officer Wang's mobile phone, He Xingping gave an example on the spot: "For example, if I log in to your certain treasure account, I can see what you have bought, and I can see your usual spending habits, so I know your online orders."

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

"For another example, if you go to the quick payment method, the owner of the phone with this number will receive a SMS reminder of the balance."

"If that's the case, we'll be able to see whether the person has money or not."

Seeing Police Officer Wang let out a long breath, He Xingping immediately knew that Police Officer Wang was a poor man, so he said unscrupulously:

"After we have determined the basic information of the victim, we will use the victim's mobile phone number again, add a dynamic verification code, and use the password-free payment method to transfer the victim's money out."

"And you have to know that many payments do not require a password now, and a verification code is enough. We use secret payment. When the password is not needed, the money is withdrawn with a fast payment method."

"Then 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 [-] or [-]."

"Also, even if you have no money in your bank card, but you have a certain payment, a certain treasure, you have Huabei to borrow, and there are other IOUs."

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

"At this time, you didn't do anything, and you just received 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, Police Officer Wang and Lu Weiwei looked ugly.

It can be said that this kind of modus operandi is silent, and it is impossible to guard against it.

Officer Wang was also thankful that he had no money in his card, so he was not afraid of thieves thinking about it.

Otherwise, once my mobile phone signal is interfered by these gangs, and the 4G and 5G signals instantly become 2G, wouldn't that be the end of my life?

Thinking about it now when he was on duty late at night, the mobile phone signal suddenly changed to 2G. Police Officer Wang is still a little scared.

……

(End of this chapter)