In today's digital age, cybersecurity is becoming more important than ever. As technology evolves, so does the threat of hackers and malware. In order to better protect cybersecurity, we need to understand the nature of cyberattacks and explore some advanced technical means. This article will introduce an unusual but dangerous approach: building computer LAN control software using the assembly language.
The assembly language is a low-level programming language that directly manipulates computer hardware. It is more low-level than high-level languages, allowing for more granular control over the hardware. In cybersecurity, hackers take advantage of this underlying control to carry out attacks and build malware.
First, we need to initialize the network connection using the assembly language. Here's a simple example of how to establish a connection to the target machine:
mov eax, 4 ;socket system call.
mov ebx, 1 ;TCP protocol.
int 0x80 ;Call the kernel.
Once the connection is established, we can monitor the target computer's communication by intercepting the data stream. The following ** demonstrates how to intercept data:
mov eax, 3 ;read system call.
mov ebx, [socket_fd] ;socket:("www.vipshare.com")；File descriptor.
mov ecx, buffer ;Buffer.
mov edx, 1024 ;The number of bytes read.
int 0x80 ;Call the kernel.
Once we get the data, we need to parse it to know the activities of the target computer. Here's a simple example of data parsing:
mov eax, buffer ;Data buffers.
mov ebx, keyword ;Keyword.
mov ecx, 0 ;Match counters.
search_keyword:
cmp byte [eax], 0 ;Determine whether the end of the data has been reached.
je end_search
cmp byte [eax], ebx] ;Compare the current bytes.
jne not_matched
inc ecx ;Match counter plus one.
not_matched:
inc eax ;The pointer moves to the next byte.
jmp search_keyword
end_search:
After monitoring key data, we can automatically submit the data to the specified ** through the following **Example::
mov eax, 4 ;socket system call.
mov ebx, 2 ;HTTP protocol.
int 0x80 ;Call the kernel.
mov eax, 4 ;socket system call.
mov ebx, [website_socket] ;socket file descriptor.
mov ecx, monitored_data ;Monitored data.
mov edx, data_length ;The length of the data.
int 0x80 ;Call the kernel.
Using the Assembly language to build computer LAN control software is a dangerous practice that seriously threatens network security. Understanding these techniques can help cybersecurity professionals better protect against and combat potential threats. However, we would like to emphasize that this article is for educational purposes only and encourages everyone to follow a legal and compliant code of ethics and stay away from any illegal online activities.