27 lines
881 B
YAML
27 lines
881 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,userdehghani
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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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metadata:
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max-request: 1
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tags: mail,expn,network,detect,smtp,detection,tcp
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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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port: 25,2525,465,587
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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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# digest: 4a0a0047304502200d7af4166ff760484091f76d77a3c950aefd20f2ba3bf4b55cb32cfeac246bee022100b4e7ef40aa0527906d5a7acf022d441cb037c87a78bce215a93fa864f8f1cd2e:922c64590222798bb761d5b6d8e72950 |