27 lines
652 B
YAML
27 lines
652 B
YAML
id: expn-mail-detect
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info:
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name: EXPN Mail Server Detect
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author: r3dg33k
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severity: info
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description: |
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The "EXPN" can be used by attackers to learn about valid usernames on the target system. On some SMTP servers, EXPN can be used to show the subscribers of a mailing list subscription lists are generally considered to be sensitive information.
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tags: mail,expn,network,detect
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metadata:
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max-request: 2
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tcp:
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- inputs:
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- data: "65686c6f20636865636b746c730a"
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type: hex
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read-size: 2048
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host:
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- "{{Hostname}}"
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- "{{Host}}:25"
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matchers:
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- type: word
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words:
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- "250-EXPN"
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