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Low Severity

Spam: Cryptocurrency airdrop/giveaway

Description

Detects messages promoting cryptocurrency airdrops, token claims, or wallet-related rewards.

References

No references.

Sublime Security
Created Jul 25th, 2025 • Last updated Oct 16th, 2025
Source
type.inbound
and any(ml.nlu_classifier(body.current_thread.text).topics,
        .name in ("Financial Communications")
)
and not any(ml.nlu_classifier(body.current_thread.text).topics,
            .name in (
              'Newsletters and Digests',
              'News and Current Events',
              'Legal and Compliance'
            )
)
and not any(ml.nlu_classifier(body.current_thread.text).intents,
            .name == "benign" and .confidence == "high"
)
// action word
and (
  strings.ilike(subject.base, '*airdrop*')
  or strings.like(body.current_thread.text, '*airdrop*')
  or strings.ilike(subject.base, '*giveaway*')
  or strings.like(body.current_thread.text, '*giveaway*')
  or regex.icontains(body.current_thread.text, 'receive \$\d{2,5} worth')
  or regex.icontains(body.current_thread.text,
                     'claim your (allocation|airdrop|bonus|share|\$\d{2,5})'
  )
  or regex.icontains(body.current_thread.text, 'connect .{0,20} wallet')
)
and not regex.icontains(body.current_thread.text, '\$\d{2,4} (off|cash)')
and (
  // crypto keyword
  regex.icontains(body.current_thread.text,
                  '\bmetamask\b',
                  '\bethereum\b',
                  '\bbinance\b',
                  '\bgemini\b',
                  '\bwallet\b',
                  '\bkraken\b',
                  '\bsolana\b',
                  '\btrezor\b',
                  '\bledger\b'
  )
  // token name, e.g. $USDT
  or regex.contains(body.current_thread.text, '\s\$[A-Z]{3,4}\s')
)
and not (
  sender.email.domain.root_domain in (
    "gemini.com",
    "ledger.com",
    "binance.com",
    "trezor.io",
    "kraken.com",
    "solana.com",
    "metamask.com",
    "ethereum.org",
    "bloomberg.com"
  )
  and headers.auth_summary.dmarc.pass
)
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