Sublime Security high experimental mql

Attachment: Macro with suspected use of COM ShellBrowserWindow object for process creation

Macro references the ShellBrowserWindow COM object which can be used to spawn new processes from Explorer.exe rather than as a child process of the Office application. This can be useful for a threat actor attempting to evade security controls.

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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.explode(.),
                any(.scan.strings.strings,
                    strings.ilike(.,
                                  "*new:C08AFD90-F2A1-11D1-8455-00A0C91F3880*"
                    )
                )
        )
)

Field Validations

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