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Spamming with BGP Spectrum Agility

Spamming with BGP Spectrum Agility. Anirudh Ramachandran Nick Feamster Georgia Tech. Collection. Two domains instrumented with MailAvenger Sinkhole domain #1 Continuous spam collection since Aug 2004 No real email addresses---sink everything 3 million+ pieces of spam Sinkhole domain #2

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Spamming with BGP Spectrum Agility

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  1. Spamming withBGP Spectrum Agility Anirudh Ramachandran Nick Feamster Georgia Tech

  2. Collection • Two domains instrumented with MailAvenger • Sinkhole domain #1 • Continuous spam collection since Aug 2004 • No real email addresses---sink everything • 3 million+ pieces of spam • Sinkhole domain #2 • Recently registered domain (Nov 2005) • “Clean control” – domain posted at a few places • Not much spam yet…perhaps we are being too conservative

  3. Spamming Techniques • Mostly botnets, of course • We’re trying to quantify this • Coordination • Characteristics • How we’re doing this • Correlation with Bobax victims • from Georgia Tech botnet sinkhole • Heuristics • Distance of Client IP from MX record • Coordinated, low-bandwidth sending

  4. BGP Spectrum Agility • Log IP addresses of SMTP relays • Join with BGP route advertisements seen at network where spam trap is co-located. A small club of persistent players appears to be using this technique. Common short-lived prefixes and ASes 65.0.0.0/8 23541 61.0.0.0/8 4678 82.0.0.0/8 8920

  5. Length of short-lived BGP epochs 1 day ~ 10% of spam coming from short-lived BGP announcements Epoch length

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