Hunting Cobalt Strike C2 with Shodan

Cobalt Strike C2 Hunting

Four techniques:

• Default certificate.
• Hash + 50050 port (FP filtering is required).
• JARM (FP filtering is required).
• ASN/ISP scanning (this one is handy for subnet pivoting).

You can read my Twitter thread where I explained the logic behind each technique.

Short summary and results:

Default certificate

ssl.cert.serial:146473198

Shodan Search

725 hits

ssl.cert.serial:146473198

Hash + 50050 port

hash:-2007783223 port:”50050"