This case is too difficult.
What exactly is abnormal?
Zhou Liu's eyes were sore and Li Hua couldn't stand it anymore. Hu Liang and Jiang Hanshan from the institute went to the branch, Wang Caizhi went to several banks for on-site inspections, and the rest of the people decided to discuss it together.
Huang Qingmei was now interested in the case. She didn't notice that the cup was empty. She took a sip but didn't finish it. But she still took the lead and said:
"Abnormal. For example, although it is early autumn now, it is still 30 degrees at noon. It is abnormal to wear a big cotton-padded jacket. The supermarket theft case last month was discovered in this way. A man hid more than 20 kilograms of things in his clothes and was caught on the spot by the security guard."
Li Hua quickly poured some water for Huang Qingmei:
"The most abnormal thing is that the bus was not crowded, but he insisted on getting close to other people. He must be a pickpocket, and I will catch him every time!"
Li Juan didn't come to apply for a certificate at this time. She was thoughtful:
"The child was wearing beautiful clothes and looked plump and delicate, but he was using a dirty bottle and his parents didn't really care for him. He must be a human trafficker."
Zhang Guilan looked very cool in her police uniform and said with a smile:
"Everyone is talking about the anomalies in previous cases, but what about this case? We can't just avoid it because it's a technology fraud crime, right?"
Community, clerical, and publicity police officers have almost no experience in handling cases, and have never even organized case files.
The Longhua Street Police Station is relatively good because of the shortage of staff, so everyone is forced to become a jack of all trades.
It was Zhou Liuyi's turn. Zhou Liuyi brought over a piece of paper with the following items clearly marked on it:
"First of all, fake base station fraud is an illegal radio communication device that takes advantage of the GSM single-item authentication flaw. It is composed of a host and a laptop and has a certain radiation range, so the other party should be nearby.
Secondly, the people who reported the case were not cheated at one specific time, but were cheated from seven to ten in the morning, which shows that the suspect did not move the equipment away.
Third, according to the information provided by the reporter, the area where the text message was received was roughly within a 500-meter radius with the intersection as the center.
Xu Hai also wrote a piece of paper, which basically overlapped with the information Zhou Liuyi had obtained. He nodded and motioned Zhou Liuyi to continue:
"He is very skilled and used a card issued with a mountain ID card to transfer money. We can't catch him in a short time."
Zhou Liuyi talked about the results in a flat tone, just a summary, but everyone except Xu Hai seemed very frustrated.
Xu Hai nodded and asked Zhou Liuyi:
"so what?"
Saturday said:
“First, we will investigate those fraudsters with criminal records.”
Xu Hai nodded:
"The newly formed reconnaissance team of the branch is already doing it. I asked Liangzi, but it's no use." Today's cyber fraudsters are like devils. They are hard to catch and they just run away after committing a crime.
It is very likely that this fraudster has directly deployed a fake base station locally, and the person has already fled thousands of miles away, so catching him is like looking for a needle in a haystack.
In a word, this case is very difficult, as difficult as a tiger trying to eat the sky and finding it impossible to start.
Hu Liang's team at the police station didn't find any useful clues. They had already checked all the people and places that could be checked. Wang Caizhi was also following them to scan the streets and ask the reporter for clues...
This is precisely the biggest characteristic of fraud cases, especially electronic fraud cases. There is no evidence, people and evidence are separated, and stolen money is quickly laundered and transferred.
It was precisely because there were no clues that Xu Hai did not take Zhou Liuyi directly to kill them, but stayed in the station, hoping to find a way to handle the case and then go there to summarize it.
This is beyond the scope of what the police station can do.
Saturday asked again:
“What about IP tracking?”
This is a blind spot in the knowledge of everyone in the police station.
As a criminal police officer, Xu Hai had worked with the special case team on such cases before, so he had experience:
"The anti-fraud team contacted the network security team, and they found out that the other party was using a zombie springboard and could not track down the real IP address."
All the clues are broken!
Others were worried, but there were too many unsolved online fraud cases. In the years when there was no anti-fraud center, the case solving rate was less than 10%.
Even now, the crime clearance rate has increased significantly, but it is only around 30%.
There are more than 1.3 million cases in the country each year, but only more than 300,000 of them can be solved.
Li Hua was dejected:
"This won't work, and that won't work either. What can we do about the case? There are seven banks at the intersection. From 7 a.m. to 11 p.m., thousands of people pass by, and there's no guarantee that any of them will be criminals."
Xu Hai didn't knock his head:
"What's a few thousand people? If it's a homicide, they'll directly investigate the millions of people in the city."
Li Hua is like a deflated ball:
"At least we can profile the murderer psychologically, and at least he should be present at the murder scene. Even if we investigate, we can have a rough outline, including height, weight, age, gender, and occupation. But for cyber fraudsters, we have nothing."
Xu Hai asked back:
"Do you know any medical students? They don't have any key points in their annual exams. Will patients get sick according to the key points written in the textbooks? Will the criminals we come into contact with commit crimes according to the case handling procedures we set?"
Xu Hai waved his hand, feeling annoyed at the argumentative boy. In fact, it was because what Li Hua said were all the real difficulties in handling the case.
There is a high possibility that this case will become an unsolved case.
The fraudulent funds of more than 10 million yuan were enough to bankrupt several families and cause them to commit suicide by jumping off buildings.
Xu Hai originally expected Zhou Liuyi to find some clues. After all, he was a new generation who grew up playing with electronic products. However, children are just children. They have not seen so many storms. When he received the text message, Zhou Liuyi did not find any clues.
He still needs a long time to grow up.
Zhou Liuyi did not argue anymore, but clicked on the URL attached to the text message and put it on the computer. It was actually a simple web page for uploading ID card, bank card, password and mobile phone number. It was just like someone using QQ posting a message, without any technical content.
After the victim uploaded the information, the fraudster immediately used the victim's information to log into the bank, and when the victim needed to enter the verification code, he asked the victim to fill it out again.
This scam is too simple.
It can be described as a perfect social engineering template, taking advantage of the public's trust in banks, the system loopholes regarding the age of ID cards, and the fact that ordinary people are unguarded against text messages sent by professional organizations.
With just a few simple steps, the victim's life savings can be swindled away.
However, there is absolutely no perfect crime in the world. As long as a person takes action, he will definitely leave traces. What exactly are these traces?
Zhou Liuyi opened several web pages on his computer, frowning and thinking hard. This was the first case he had encountered since he became a police officer where he had to confront a faceless criminal.
From then on, almost all major cases we handled were cases like this.
He needs to get used to it, stay calm, and find out the criminals...
On Saturday, the information of the reporters was taken one by one. The largest loss was more than 10 million yuan, and the smallest loss was only a few dozen yuan.
Moreover, they emptied every card in the name of the victim in order, tens of thousands, thousands, and dozens of dollars were all transferred away. They also emptied several accounts used for online cash withdrawals, with the amount accurate to two decimal places.
Not a penny was left for them!
The victim was crying and wailing, but luckily the mobile phone bill could not be transferred out once it was transferred in, otherwise he would not even be able to call the police.
Do criminals care about a few tens of dollars, a few dimes, or a few cents? Nowadays, people don't even want to pick up a few dimes that have fallen on the ground.
But this criminal also entered all of them manually one by one and transferred them out?
Suddenly, an idea struck him.
Zhou Liu stood up so fast that his chair fell over. He asked Xu Hai excitedly:
"I can fish him out!"
Xu Hai took one look at Zhou Liuyi and knew what he was planning, then refused:
"No, this is not a good idea. This is a meticulous and skilled old liar. He must have been using a springboard. We can't take risks with our own money. What's more, the institute does not have such funds right now."
Zhou Liu rested his hand on the table, his eyes sparkling, as if there was a fire burning in them:
“This is our only way!”
Xu Hai sneered:
"The fact that he can play with social rules so well proves that he is not an easy fish to catch. If you make a mistake in judgment, it will affect your future and you will be laughed at by your peers."
But Saturday was very persistent:
"How do you know if you don't try? Let others laugh, I'm not afraid. What do you mean by a future? Is it just for me to sit behind a window and stamp stamps for the rest of my life?"
Xu Hai was a little surprised that Zhou Liuyi could actually say such a thing and was actually willing to take the risk.
Liang Peihe assigned several people to analyze and solve the case. Because the method of this case was very special, the case team was temporarily named: Fake base station impersonating a bank to update identity card fraud case.
There were seven or eight people sitting in the conference room. Among them, Hu Liang and Jiang Hanshan were the first police officers in the police station to receive the report. They sat in the front with a stack of case files.
Several police officers with high ranks and dark circles under their eyes, but who look young and are carrying computers, are from the anti-fraud team. They are technical police ranks with grey epaulettes. In the public security system, technical police ranks are promoted faster than those with black epaulettes.
There were also a few people in plain clothes who were not very noticeable. They were criminal police.
But among them, there was a particularly eye-catching woman, who was particularly eye-catching in this masculine unit. She had neat short hair, fair skin, big eyes, and thin lips, which were tightly pursed. Her slender fingers quickly flipped through the documents in her hands. She flipped through them several times and even used a pen to mark the key points. Her attitude was very serious.
She has long legs and a thin waist. She wears a leather and denim jacket that just reaches her waist, wide khaki jeans, and Martin boots that almost reach her knees.
This kind of outfit would make an ordinary girl look cute and tender, but she looked powerful all over. Her arms and long legs were well-trained and she could smash a criminal's head with one punch.
She has been a police officer for ten years and is experienced and has made achievements. Even though she is still young and a woman, no one will look down on her.
Lei Ming is like a queen of flowers, people can't take their eyes off her, but they dare not look down on her.
She looks young and beautiful, but no one would treat her as a vase. She has a cold and fragrant scent like sunlight shining on ice crystals.
Noticing someone coming in, Lei Ming raised his eyes and saw that it was Zhou Liuyi. He curled his lips slightly and nodded gently, which was considered a greeting.
It was obvious that she was a little surprised to see him here on Saturday.
New police officers who are training at the police station generally do not appear in such occasions.
It seems that the children have been working very hard during this period.
Zhou Liu knew that Lei Ming was not a good-tempered person, so he quickly found a seat to sit down with Xu Hai.
Compared to Lei Ming who has his own place here, he is still a rookie. The blue shirt he is wearing is borrowed from Li Hua. He does not have a police uniform and has to sit behind Xu Hai.
When Xu Hai and Zhou Liu arrived, the team had already started working in the conference room, but everyone was in a hurry and looked serious.
Because, there are no clues!
All available technical means have been used.
Big data that can be used at the national level is also used.
But the criminals were like a drop in the ocean and could not find any useful clues at all.
Liang Peihe sat in the main seat. When he was recruiting new members, he was deeply impressed by Zhou Liuyi. However, Zhou Liuyi had only been on the job for a few days and it was impossible for him to develop the thinking of a police officer.
Therefore, his focus was not on Zhou Liuyi.
He asked Xu Hai:
"Have you guys come up with anything yet?"
Xu Hai pointed at Zhou Liuyi behind him:
"Director Liang, the case happened in our jurisdiction and we have a limited time to solve it, but we have too few clues. Xiao Zhou has come up with a solution. We can give it a try. We want to start again from the victim's card and lure out the suspect."
What?
A junior policeman who hasn't been promoted yet?
Doing such a dangerous thing?
Xu Hai's meaning was very clear. He would top up the victim's card with money and then upload the information again to track him.
It’s like, when fishing, a cunning fish eats the bait, and then the fisherman has to use more expensive bait to lure the fish to take the bait.
This plan won't work.
As soon as Xu Hai said this, everyone's eyes were on Zhou Liuyi.
Especially the two people from the anti-fraud team, their faces even showed a little anger. It was a joke to let such a young person take the lead:
"We don't have any clues at the moment. We don't even know if the suspect is a man or a woman. We've already lost so much money. If we put more money in, can you afford the loss?"
A criminal police officer with a weathered face also expressed his objection in a gentle but firm tone:
"So many victims have already reported the case. If the fraudster is nearby, he will definitely flee and will not fall into the trap we set."
…
Lei Ming turned her watch and checked the time. In a large case-handling team, holding meetings, thinking of plans, finalizing plans, and implementing arrests...is actually a relatively long process. She is young and not the main decision maker, so she waited for everyone to finish speaking before speaking:
"Xiao Zhou, can you tell me how to do it specifically?"
Lei Ming's voice was not loud, but it did not have the fragility of a girl, and her tone showed that she trusted Zhou Liuyi.
Zhou Liuyi looked over immediately. Before anyone else could comment, Zhou Liuyi quickly stood up with the memo on his phone and the implementation steps he had drawn, and hung his flowchart under the projection:
"Our opponents are proficient in social engineering and professional technology, but we can also take advantage of this. I have checked these victims. Among them, there is an 80-year-old man who sells mahogany furniture. He is still using an old-fashioned mobile phone that cannot connect to the Internet. His accounts are all settled through bank counters.
I think it would be appropriate to use his information to deal with scammers.
During the process of uploading information, we can send the scammers reverse Trojan virus software, so that as long as the scammer clicks on it, we can control the scammer’s mobile phone and obtain his location and identity information.”
The anti-fraud team raised the first objection:
"The scammer used a springboard and we couldn't locate him."
Saturday explained:
"Currently, banks and various regulatory authorities have restrictions on account login scenarios. It is difficult to log in via springboards or remote operations, and manual input is required."
Jiang Hanshan was a little surprised that Zhou Liuyi, a young man who had just joined the company, was so involved in the case. Before others could embarrass him, he asked the first question:
"What about the funds? Will the victims pay for it, or will we, the police, pay for it? Will we pay a few dollars, or tens of thousands?
When we are on drug bust, we often pretend to be buyers and need to take a sum of money, but we will get the money back when we catch the criminals red-handed.
What are you going to do with this money?"
If the amount is too little, you may not be able to catch the big fish; if the amount is too much, you may lose everything and become a laughing stock in the industry.
Jiang Hanshan is the instructor of the Longhua Street Police Station. As long as he is in charge of the daily operation of the police station, it is very appropriate for him to raise this question.
Zhou Liuyi lowered his head and thought for a moment. Everyone thought he had backed out, but Zhou Liuyi said:
"I think it should be 10,000 yuan first, then 1,000 yuan, then 5,000 yuan, and finally 10 yuan."
What?
Is it so jumpy?
Liang Peihe actually thought Zhou Liuyi's approach was unreliable at first, because huge losses had already been incurred, and these small-scale actions might not work. But now it seems that Zhou Liuyi may have found the right way:
"Why?"
Saturday one:
"The other party must be a gambler."
With such good skills and a deep understanding of human nature, can't he find a factory to work in? I took a look at the production of the webpage on Saturday. It was quite exquisite, without a single line of unnecessary nonsense code.
There is no problem at all in finding a job with an annual salary of 300,000.
If it is a small company in its early stages of development, you will most likely be able to get stocks and dividends from the project leader.
Instead of living a peaceful life, he takes risks. What else could he be if not a gambler?
Old man Bai Qianhua was quite cooperative and took out his bank card. However, he wanted to see how the police solved the case. He was very interested in such modern detective methods. The victim's request was not too excessive, so the investigation team set up several computers on the second floor of the old man's shop and started working.
When I opened the text messages on Saturday, I logged into the first text message sent by the fake bank card and uploaded all the old man’s information.
Two minutes later, all the money in the bank card was transferred away.
The other party actually swallowed a bait worth ten thousand dollars!
Zhou Liuyi and the anti-fraud brigade's network security did not take any measures, and then uploaded a second forged bank text message and uploaded the information. However, this time, the two network security officers began to trace the IP address of the other party to open the web page.
With Internet authority from the provincial department, they can start working faster and more legally than ordinary network security engineers.
This is a resource that Zhou Liuyi has the technology to achieve, but he cannot obtain. His eyes are almost seeing through the computer screen of the network security officer.
In fact, the two network security officers are not very old. Xu Zhongping was recruited as a graduate student last year. He is quite arrogant:
"These computers were just purchased this year."
Saturday rolled around.
Some of the computers in the Longhua Street Police Station are about his age. They basically have no image detection capabilities, and when they encounter cases, they often call up surveillance cameras from nearby traffic police, schools, hospitals, and businesses.
Longhua Street Police Station is an urban and rural police station.
The second hook also sank, and the thousand dollars was quickly transferred away, but at this time, something exciting was caught!
This IP address is actually in Sanjiang City!
Zhou Liuyi calmly uploaded the background of the third forged text message from the bank, but this time, he was careful, which was also the most critical step.
He inserted his USB drive into the computer, extracted a virus from it, filled it in after the web address, and added code to make the previous line of URL invalid.
This step is the most important!
Lei Ming was standing behind Zhou Liuyi at this moment, his figure was slender and tall. Although she could not understand, she nodded slightly to show her approval as the instructions were completed.
Lei Ming and Zhou Liuyi have known each other for a long time, but they cannot be considered childhood sweethearts because Lei Ming was born in 1995, seven years older than Zhou Liu. When Lei Ming was in the first grade, Zhou Liuyi was still in her mother's belly.
She was already carrying a gun in the armed police force when Zhou Liuyi was just in the first grade of primary school.
But now, they are colleagues in the same industry.
Zhou Liuyi was no longer the New Year picture baby who followed her around in open-crotch pants and asked for candy. Instead, he was a new police officer in a navy blue uniform. And so many people were waiting for his explanation:
"In fact, this step has been completed. The other party was curious and clicked on the link. This link does not have a button to allow or deny access. It is like the satisfied or dissatisfied button when we go to the government building to do business. Even if the person clicks dissatisfied, it is satisfied if you press it again.
Now my computer has remotely monitored the other party's computer, just like when we were kids and taking computer classes, the teacher sat on the podium and used his computer to control our computers, and our computers were all filled with the contents on his screen.
Next, we can crawl each other’s information.”
Information refers to the other party’s location, identity, and criminal evidence.
This news was exciting. The criminal police and several people from other units thought Zhou Liuyi's move was very clever. The old criminal policeman Ma Qianli, who looked very weathered, handed Xu Hai a cigarette:
"Youth are a formidable force. When I was a police officer, the only electronic equipment in the police station was a telephone. Now, everyone uses computers to handle cases."
Xu Hai took the cigarette and looked at Zhou Liuyi with some pride. This was a talent from their institute:
"When I was a police officer, the second-class hero model was given to the police who charged forward on the front line, but now it has been given to the person who invented the DNA genealogy cluster. He has never handled a case in a day and has never arrested a criminal. He compares them in the laboratory and lets the people in the front arrest people. I heard that with this technology, thousands of people can be arrested every year, and several cold cases that had no clues before have been solved."
Ma Qianli nodded repeatedly:
"That's right. Technology is the primary productive force, and this is also true for our police units."
The two network security officers had little experience, but they were technically knowledgeable. Xu Zhongping looked at Zhou Liuyi suspiciously and approached him to ask:
"Dude, this remote control software of yours is a Trojan virus, right? Why does it look so familiar to me? Now I remember that two years ago, an undergraduate student from our school created this virus to attack the Academic Affairs Office in order to steal the examination papers. Later, a computer science student from another school was asked to catch the person, and then the virus should have been destroyed. But how did you get it?"
Xu Zhongping became more and more excited as he spoke, and the way he looked at Zhou Liuyi changed, and he instantly admired him to the extreme:
"Shit! I remember now, the student from another school that our school invited is you!"
Then there are the criticisms:
"This virus is very harmful. How could you keep it for yourself? I remember our teacher said that we had to destroy the one we signed an agreement with, and it must not be leaked out..."
Jiang Hanshan was chatting with the criminal police. When he heard this, he hurried over to hold Xu Zhongping down to prevent him from attracting Liang Peihe's attention:
"Young man, have you ever taken a course on drug control? The opioids we use for medical treatment now are pain-relieving drugs that act on nerves and require a doctor's prescription and can only be purchased in small quantities.
It's the opium of the past.
This thing can be used as medicine to cure diseases if used properly. However, in order not to cause panic among the people, the word "opium" was replaced by "opiate" during the translation. Do you understand?
Everything is a double-edged sword, we can’t just look at one side…”
However, Liang Peihe's attention had been attracted, and his eyes were quite complicated and scrutinizing. He wanted to say something, but Xu Hai also blocked the screen. It seemed that he was looking at the computer screen, but in fact he was blocking the sight of another network security officer.
On Saturday, the key information had already been crawled, and everyone pricked up their ears to listen to the clues he found:
"Found it. This person didn't run away. He's in this neighborhood next to the intersection... Jinxiu Garden. I can locate his building, but I can't locate his floor number."
At this moment, on the fifteenth floor of Jinxiuyuan Community, a lazy-looking man wearing black square-framed glasses and a plaid shirt was eating instant noodles while busy with the money on two other cards.
After making ten thousand yuan, it will be one thousand yuan. It is worth doing it. After all, it can be completed in one minute, which is equivalent to earning one thousand yuan in one minute.
This money came too easily.
Although it was ten times lower than the 10,000 yuan on the previous card, he didn't think it was too little.
After paying the thousand yuan, the next card would have five thousand yuan, which made him a little happy, just like Taobao, he finally had a little more.
However, the next card had ten dollars.
Isn’t this too little?
Although this man who makes mahogany furniture is old, he is wealthy. He has made more than two million in a row and always feels that he has money in other cards.
All of Liu Hua's attention was drawn to whether there was another card, and his emotions fluctuated violently with the amount of money in the bank card.
Liu Hua didn't know that a dangerous aura was quietly approaching along the network cable.
Someone was remotely monitoring his desktop.
Liu Hua was chatting on his mobile phone with a good friend he met online. The netizen’s name was dark in English, which means dark matter and implies the unknown.
This friend is very cautious. Since we met, he has been using anonymous distributed online chat rooms. He does not use the current mainstream real-name chat software. Even if he does, he will only use the newly registered account and change it after use .
Liu Hua looked down upon this habit .
There are not many people who have attended college in the country now, and not many people understand technology, so there is no need to pay such high social costs.
This money-making idea was thought up by the mysterious Dark, who could also provide a way to launder the money. Dark's requirement was that only piglets could be slaughtered between 7:30 and 8:30 in the morning.
Because that time point is exactly the time for people to go to work, they can concentrate on killing some of the people passing by, as well as those who have arrived at the bank early and are waiting to handle large transactions.
Moreover, that time point is when the police on duty take over their shifts.
Even if you call the police, they don't have the ability to respond that quickly.
Then, you just need to close the net and count the money.
Who knew that once Liu Hua saw the money, he couldn't take it back. He even took the time to transfer out the account with ten yuan. This is simply picking up sesame seeds and losing watermelons.
This inexperienced look made Dark feel annoyed:
"Liu Hua, you are so wicked. I refuse to launder money for you."
Liu Hua is very happy:
"Then I'll eat it all by myself."
Dark gave him one last piece of advice:
"Since you once lent me your computer, I'll give you a suggestion. Next, if you honestly tell the police what you did, you can save yourself a few years of using the sewing machine."
What?
Liu Hua didn't react, he just thought Dark was exaggerating:
"You are just too timid. Do you know how low the detection rate of telecommunications fraud is? I only make less than 100,000 yuan a year in the bank. The money I earn today, I have to save for 300 years, and I have to endure the bullying of that old man every day. You don't know how fawning Fang Li, who always finds fault with me, is to our bank president. I have been pursuing her for half a year, bringing her buns every morning. I myself have never been willing to eat meat-filled buns. But she didn't even want to get a room with me on Valentine's Day. How hypocritical this woman is..."
But dark had already blocked him, and the messages he sent showed that the network was disconnected.
Liu Hua sat on the bay window and looked out. He felt that he had eaten his instant noodles too early. He should order some seafood takeout on his phone. He had never eaten abalone or lobster before.
But when he opened the food delivery app and saw that the seafood meal cost hundreds of dollars, he gave up:
"It's not even as good as pork. It's probably not fresh. It's made from dead fish, rotten shrimp and waste cooking oil..."
"Next, we will have a 'caught' order coming up."
A vehicle with no obvious police signs and only a license plate with black letters on a white background slowly drove into the Jinxiuyuan community. Zhou Liuyi sat in the back seat. After getting out of the car, he and Lei Ming walked up to the building hand in hand, pretending to be a couple.
The men are handsome and the women are pretty, and people keep turning their heads to look at them.
In fact, Lei Ming is the best fighter in this criminal police team. Although he is not as strong as men, his fighting skills are quite good.
She looks like she has long legs and a thin waist, but when Zhou Liu hugged her waist and arms, he felt solid muscles.
It is impossible for young lovers to walk without talking, on Saturday:
"Sister Xiao Ming, are you King Kong Barbie?"
Lei Ming glanced at him with a cold look:
"If you can't speak, don't speak."
Zhou Liuyi became like a little chicken, he immediately stopped talking and lowered his head to play with his mobile phone. People in the elevator also laughed, making fun of Zhou Liuyi for being afraid of his girlfriend.
In fact, his mobile phone was searching for nearby wireless network signals.
By remotely controlling the other party's computer, you can see the other party's router. The router can be searched for signals within a range of five to ten meters.
Fortunately, the buildings here have two households per elevator, and the Internet cable entering the house is usually not far from the door.
First floor, no signal found.
Second floor, no signal found.
…
On the twelfth floor, a signal suddenly appeared.
Zhou Liu Yixin was immediately alerted and nodded to Lei Ming, meaning that the location of the criminal had been found.
Lei Ming immediately clenched her fists, and her expression changed from relaxed to resolute. Perhaps out of professional habit, she kept Saturday behind her.
The arrest is about to begin.