Unhide is a powerful network forensics tool designed to detect hidden processes and TCP/UDP ports that are concealed using rootkits, loadable kernel modules (LKM), or other stealth techniques. It supports multiple operating systems, including Linux, UNIX, and Windows. According to its manual page, Unhide identifies hidden processes through three main methods.
The first method involves comparing the contents of the `/proc` directory with the output from the `/bin/ps` command. This helps uncover processes that may be invisible in standard process listings. The second technique compares the results of the `/bin/ps` command with data obtained directly from system calls, allowing for deeper inspection of process activity. The third method, known as "brute force," scans all possible process IDs, though it is primarily effective on Linux 2.6 kernel-based systems.
Most rootkits hide processes at the kernel level, making them invisible to regular user-space tools. To detect such threats, tools like Unhide or Rkhunter can be used to scan for rootkits, backdoors, and potential vulnerabilities. This article explains how to install Unhide and use it to find hidden processes and TCP/UDP ports.
To install Unhide on Ubuntu or Debian-based systems, you can run the following command:
```bash
sudo apt-get install unhide
```
If everything goes smoothly, the terminal will display installation progress, including package downloads and setup. For users on Red Hat-based distributions like CentOS or RHEL, you can install Unhide via the EPEL repository using:
```bash
sudo yum install unhide
```
On Fedora, the command is slightly different:
```bash
sudo dnf install unhide
```
For Arch Linux users, the command is:
```bash
sudo pacman -S unhide
```
On FreeBSD, you can either compile from ports or use the package manager:
```bash
cd /usr/ports/security/unhide && make install clean
```
Or:
```bash
pkg install unhide
```
Once installed, Unhide can be used with various test options. The basic syntax is:
```bash
unhide [options] test_list
```
Test options include `proc`, `sys`, `quick`, `brute`, and more. For example, running:
```bash
unhide proc
```
will check for hidden processes by comparing `/proc` with the `ps` command.
In addition to checking for hidden processes, Unhide also includes a companion tool called `unhide-tcp`, which helps identify hidden TCP and UDP ports. It works by scanning all available ports and detecting those that are not visible in commands like `netstat` or `ss`. For example:
```bash
unhide-tcp
```
This command will output any hidden ports that are not shown in standard network utilities. If no hidden ports are found, the output will reflect that. However, if hidden ports exist, they will be listed.
To learn more about Unhide and its capabilities, you can refer to the man pages:
```bash
man unhide
man unhide-tcp
```
Using these tools can significantly enhance your ability to detect malicious activity on a system, especially when traditional tools fail to show the full picture. Whether you're a system administrator or a security professional, understanding how to use Unhide can be a valuable asset in maintaining system integrity.
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