Source: https://lnkd.in/eCVMfUHG
You Should Know:
1. Detecting and Blocking Phishing Domains
To prevent SMS phishing (smishing) attacks, organizations can proactively block or park malicious domains. Here are some practical steps:
Using Linux/Windows Tools to Block Malicious Domains
- Linux (iptables):
sudo iptables -A OUTPUT -d malicious-domain.com -j DROP sudo iptables -A FORWARD -d malicious-domain.com -j DROP
- Windows (Firewall Rule via PowerShell):
New-NetFirewallRule -DisplayName "Block Phishing Domain" -Direction Outbound -Action Block -RemoteAddress "malicious-domain.com"
Automating Domain Blocking with Hosts File
- Linux/Windows Hosts File Modification:
echo "0.0.0.0 malicious-domain.com" | sudo tee -a /etc/hosts
(Windows: Edit `C:\Windows\System32\drivers\etc\hosts` as Administrator)
2. Egress Filtering for Enhanced Security
Agha Z. highlighted the importance of egress filtering to monitor outbound traffic.
Implementing Egress Rules with pfSense/iptables
Allow only specific outbound traffic iptables -A OUTPUT -p tcp --dport 443 -j ACCEPT iptables -A OUTPUT -p tcp --dport 80 -j ACCEPT iptables -A OUTPUT -j DROP Block all other outbound traffic
3. SIM Swap Protection Measures
- Enable Multi-Factor Authentication (MFA):
Use Google Authenticator (Linux CLI alternative) oathtool --totp -b "YOUR_SECRET_KEY"
- Monitor Account Activity:
lastlog Check recent logins (Linux) Get-WinEvent -LogName Security -MaxEvents 10 Windows Event Log
4. Detecting Ransomware Activity
- Linux (Ransomware File Monitoring):
find / -type f -name ".encrypted" Search for encrypted files
- Windows (Ransomware Protection via PowerShell):
Get-SmbShare | Where { $_.Path -like "encrypted" } | Remove-SmbShare
What Undercode Say
Proactive domain blocking, strict egress filtering, and real-time monitoring are essential against SMS phishing and SIM-swapping attacks. Organizations should:
– Park or block known malicious domains
– Implement strict outbound traffic controls
– Enforce MFA and monitor unusual login attempts
– Train employees to recognize phishing attempts
Expected Output:
A hardened security posture with reduced phishing success rates, blocked malicious domains, and improved incident response capabilities.
Prediction
As attackers evolve, AI-driven phishing domains and deepfake voice scams may become the next frontier in social engineering. Organizations must adopt AI-based threat detection to stay ahead.
Would you like additional details on any specific countermeasure? 🚀
References:
Reported By: Jamie Williams – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
