Who are the people in your neighborhood? Tracking 'Shady' CIDR blocks
summary
Shows a reproducible workflow that converts cloud CIDR lists into /24s, merges them with Zeek/bro conn.log and public feeds, and flags persistent external connections. Uses pandas and Jupyter notebooks plus Shodan and AlienVault data. Finds cobalt strike hosts clustering in a few /16s (119.5.x.x), notes 154 systems on port 10000 versus 6 fingerprinted C2s, matches 38 AWS /24s and ~480 DigitalOcean IPs to known bad web actors, and surfaces thousands of suspect connections.
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chapters (4)
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