Medium Severity
Attachment with auto-executing macro (unsolicited)
Description
Attachment from an unsolicited sender contains a macro that will auto-execute when the file is opened.
Macros are a common phishing technique used to deploy malware.
Sublime Security
Created Aug 17th, 2023 • Last updated Jul 16th, 2025
Feed Source
Sublime Core Feed
Source
type.inbound
and any(attachments,
(
.file_extension in~ $file_extensions_macros
or (
.file_extension is null
and .file_type == "unknown"
and .content_type == "application/octet-stream"
and .size < 100000000
)
)
and any(file.oletools(.).macros.keywords, .type =~ "autoexec")
)
and (
not profile.by_sender().solicited
or (
profile.by_sender().any_messages_malicious_or_spam
and not profile.by_sender().any_messages_benign
)
)
// negate replies
and (
length(headers.references) == 0
or not any(headers.hops, any(.fields, strings.ilike(.name, "In-Reply-To")))
)
Playground
Test against your own EMLs or sample data.