Sublime Security medium experimental mql

Attachment with auto-executing macro (unsolicited)

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.

View Source

Detection Logic

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 headers.in_reply_to is null)

Field Validations

Loading…

Comments (0)

Loading comments...