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URL: APT-C-36 Infrastructure Analysis
You Should Know:
1. SSH Key Pivoting:
APT-C-36 (Blind Eagle) uses shared SSH keys across its C2 servers. This allows threat actors to maintain persistence and move laterally across compromised systems.
– Command to Check SSH Keys:
ls -al ~/.ssh/
– Command to Remove Unauthorized SSH Keys:
nano ~/.ssh/authorized_keys
Remove any unrecognized keys and save the file.
2. Malware Delivery via URL Files:
The threat actor uses URL files to deliver malware. These files often contain links to malicious executables hosted on compromised servers.
– Command to Inspect URL Files:
cat suspicious_file.url
– Command to Block Malicious Domains:
Add malicious domains to `/etc/hosts` to block access:
echo "127.0.0.1 malicious-domain.com" | sudo tee -a /etc/hosts
3. Wireshark Traffic Analysis:
Wireshark logs reveal HTTP requests and connections to malicious domains.
– Command to Capture Network Traffic:
sudo tcpdump -i eth0 -w capture.pcap
– Command to Analyze Traffic with Wireshark:
wireshark capture.pcap
4. WEBDAV Server Hosting Malware:
The initial EXE is hosted on a WEBDAV server, and follow-up EXEs are stored on GitHub repositories.
– Command to Scan for Open WEBDAV Ports:
nmap -p 80,443 --script=http-webdav-scan target-ip
– Command to Clone and Inspect GitHub Repositories:
git clone https://github.com/suspicious/repo.git cd repo ls -la
5. Preventing EXE Execution:
Use Linux file permissions to prevent unauthorized execution.
- Command to Remove Execute Permissions:
chmod -x suspicious_file.exe
What Undercode Say:
APT-C-36 (Blind Eagle) demonstrates the importance of securing SSH keys, monitoring network traffic, and inspecting files for malicious content. Regularly update your systems, use intrusion detection tools, and block known malicious domains. Employing these practices can significantly reduce the risk of compromise.
Additional Commands for Security:
- Check for Open Ports:
sudo netstat -tuln
- Scan for Rootkits:
sudo rkhunter --check
- Monitor System Logs:
sudo tail -f /var/log/syslog
- Block IPs with iptables:
sudo iptables -A INPUT -s malicious-ip -j DROP
Stay vigilant and proactive in your cybersecurity efforts.
References:
Reported By: Unit42 2025 – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
