Cobalt Strike C2 Servers: Quick Threat Intelligence Wins

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The following Cobalt Strike Command and Control (C2) servers have been identified as part of an active adversarial infrastructure:

  • 81.70.251.110:443
  • 49.232.245.244:8081
  • 81.70.199.215:7010
  • 82.156.132.252:7000

For further details, refer to the original post: Hunt Intelligence, Inc.

You Should Know:

1. Detecting Cobalt Strike with Network Scanning

Use Nmap to scan for open Cobalt Strike servers: 

nmap -Pn -sV -p 443,8081,7000,7010 --script=http-title <TARGET_IP>

2. Analyzing C2 Traffic with Wireshark

Filter for Beacon traffic:

tcp.port == 443 || tcp.port == 8081 || tcp.port == 7000 || tcp.port == 7010

3. Blocking Malicious IPs via Firewall (Linux)

sudo iptables -A INPUT -s 81.70.251.110 -j DROP 
sudo iptables -A INPUT -s 49.232.245.244 -j DROP 
sudo iptables -A INPUT -s 81.70.199.215 -j DROP 
sudo iptables -A INPUT -s 82.156.132.252 -j DROP

4. Extracting Cobalt Strike Config with YARA

yara -r /path/to/malware/sample

5. Windows Defender Detection (PowerShell)

Get-MpThreatDetection | Where-Object { $_.InitialDetectionTime -gt (Get-Date).AddDays(-1) }

6. Hunting Cobalt Strike in Memory (Volatility)

volatility -f memory.dump --profile=Win10x64_19041 malfind

7. Automating Threat Intelligence Feeds

Use MISP to ingest IOCs:

misp-import -u https://misp.instance.com -k API_KEY -e events -i /path/to/iocs.json

What Undercode Say:

Cobalt Strike remains a dominant tool in adversary arsenals, often mimicking legitimate traffic. Defenders must:
– Monitor unusual SSL certificate patterns.
– Inspect JA3/S JA3 fingerprints for anomalies.
– Deploy deception techniques (e.g., CanaryTokens).
– Automate IOC updates via ThreatFox or AlienVault OTX.

Expected Output:

Blocked 4 malicious IPs via iptables. 
Detected 2 suspicious SSL handshakes on port 443. 
Memory scan revealed injected Beacon payload.

Prediction:

Increased adoption of Starkiller (Cobalt Strike’s GUI) will lead to more sophisticated attacks, requiring enhanced behavioral detection (EDR/XDR).

Expected Output:

Threat actors will shift to non-standard ports (e.g., 8443, 7443) for evasion.

References:

Reported By: Vasilis Orlof – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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