• Sublime Core Feed
Medium Severity

Headers: Zimbra mailer from a non-supported OS version

Labels

Header analysis

Description

Detects Zimbra originated emails sent from non-supported Windows versions. Observed in widespread HTML credential phishing campaigns.

References

No references.

Sublime Security
Created Aug 17th, 2023 • Last updated Aug 17th, 2023
Feed Source
Sublime Core Feed
Source
GitHub
type.inbound
and strings.starts_with(headers.mailer, "Zimbra")
and regex.icontains(headers.mailer, '\b(5\.1|6\.1)\.\d{4}\b')
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