Desperate Hacker

Chapter 61 Dragon Book, Tiger Book, Elephant Book, and Whale Book

Chen Qingfeng can no longer remember the last time he studied assembly language so carefully?
To be honest, if it weren't for the fact that I couldn't figure out this kind of program that has gone through multiple string obfuscations.

Chen Qingfeng is absolutely unwilling to start from the underlying logic to understand how this virus works?
But now he suddenly realized a problem. The subjective program he had seen before might not be the same.

It wasn't until he spent a week that he finally realized the problem.

The program that Chen Qingfeng obtained before cracking the virus probably meant that a certain frequency could swing randomly between 150 and 20-30.

To be honest, Chen Qingfeng was a little confused, why did the virus write like this?
But considering that Mansour once told him that the virus infected a high-precision machine tool.

Chen Qingfeng seemed to understand some of the reasons.

Is it to affect the speed and frequency of the machine tool?

But Chen Qingfeng thought for a moment, what is that Lua file for?

The biggest advantage of scripting languages ​​is that they can quickly combine and integrate programs from different languages.

Simply put, it's more like glue.

Glue the different parts together and make it work together.

The biggest advantage of scripting languages ​​is that they are highly integrated and flexible.

But the biggest drawback is that it's not easy to hide.

So Chen Qingfeng didn't attach much importance to the script language at first.

However, after studying assembly language for so many days, Chen Qingfeng became dizzy.

During a debugging process, Chen Qingfeng accidentally discovered that this program seemed to be calling a file with the suffix dot x regularly.

This is interesting.

Because Chen Qingfeng had traversed the entire disk and could not find this file.

So he was curious, what exactly was this file with the suffix dot x?
Finally, hard work pays off.Chen Qingfeng discovered that this file will only be renamed when it is called, but usually this file is named a system file.

That is to say, only the few tenths of a second when the program is called.

The name of the file will be renamed, and usually it will lie in your cache area, disguised as a temporary file.But when you really want to delete it, it will disappear again.

It's extremely cunning.

Chen Qingfeng felt that he had learned a lot of new things from this program in so many days.

Being an honest man, he had never written about viruses before.

So he doesn't understand, how to destroy the host system?

But this thing in Chen Qingfeng's hands taught him a lot.

Of course, now Chen Qingfeng can freely put this virus on his own host and study it.The reason is simple: this virus was not designed for the world's most widely used general-purpose x86 architecture hosts.

It is designed for the programmable logic controllers S7-315 and S7-417 belonging to Siemens.

Simply put, this is a virus that only spreads on industrial instruments.

But even so, because the characteristics of this virus are not yet fully understood.

Therefore, Chen Qingfeng does not dare to release this virus with complete confidence yet.

Then the next step is to crack the file with the .x suffix.

"How's your research going?"

"I can only say that the person who can write this virus is a genius?"

Zhao Changan has been busy developing the hotel management system these days, watching Chen Qingfeng busy around him and stopping from time to time.This also made Zhao Changan curious.

But just as he asked, Chen Qingfeng suddenly walked into the bedroom.Zhao Changan followed him in out of curiosity, and saw Chen Qingfeng pull out a box of books from under the bed.

"I actually forced you to read the book?"

"No way? How many years have you not touched the principles of compilation? I have almost forgotten some things!"

As Chen Qingfeng spoke, he struggled to pull the box of books and threw them under the bed to collect dust.

Zhao Changan saw that he couldn't pull him, so he came over quickly and laughed at Chen Qingfeng while helping him. Was he too weak?

Chen Qingfeng glanced at him thoughtfully, but didn't say much.

Every time he came back from the imperial capital, he felt exhausted.

This feeling will return after a week or a few days.

"Let me ask, what are the Chinese medicines you brought back for? I did a little reading yesterday, and it turns out that the ingredients of the Guiling ointment I bought are similar. Have you been angry recently?"

"No, it was given to me by a friend and he asked me to make up for it!"

"Oh……"

A large box of books was pulled out from under the bed by the two of them, and then Chen Qingfeng sat on the ground and began to read the technical books he had read before.

"Compilation Principles", "Modern Compilation Principles: C Language Description", "Advanced Compiler Design and Implementation", "Compiler Design".

Chen Qingfeng found these 4 books from a pile of old books.

Zhao Changan took these four books, looked at the covers, and then asked curiously:
"How powerful would I be if I could understand all four of these books?"

"If you understand all these 4 books, can you design your own programming language?"

"What do you mean?"

"Dragon Book, Tiger Book, Whale Book, Elephant Book! Haven't you, a computer student, heard of it?"

"No, I was just sleeping when I was studying the course "Compilation Principles" in college. But why don't you look for this college textbook?"

"You can throw away that kind of book!"

As Chen Qingfeng spoke, he returned to his table holding these four large books.Then I opened the book while reading the code.

These four books are named after the animal images on the covers. They are also classic textbooks for studying compilers and compilation principles.

While flipping through the book and studying the code, Chen Qingfeng's thinking became much clearer.

So he started to modify the compiler himself, and Zhao Changan looked at him like a god.

Although he couldn't understand what program Chen Qingfeng was writing, he just felt that Chen Qingfeng was so handsome at this moment.

"Boss, can I ask you a question?"

"Ok?"

"When will I be as powerful as you?"

"When? Next life!"

"Disgusting! Why can't you give me some confidence since I'm also your apprentice?"

"Well! While Chen Qingfeng was chatting, his hands were not idle. His eyes were either staring at the book or the screen. Suddenly, a proud smile appeared on the corner of his mouth!"

"Haha, I knew that no matter how powerful Sun Monkey is, he can't escape Tathagata Buddha's five fingers..."

Chen Qingfeng ran the program, and finally a file appeared on the screen.

The messy code in the file made Zhao Changan confused.However, a file named flame.x suddenly appeared in the folder.

(End of this chapter)