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/*
This Yara ruleset is under the GNU-GPLv2 license (http://www.gnu.org/licenses/gpl-2.0.html) and
open to any user or organization, as long as you use it under this license.
*/
rule with_attachment : mail {
meta:
author = "Antonio Sanchez <asanchez@hispasec.com>"
reference = "http://laboratorio.blogs.hispasec.com/"
description = "Rule to detect the presence of an or several attachments"
strings:
$attachment_id = "X-Attachment-Id"
condition:
$attachment_id
}
rule without_attachments : mail {
meta:
author = "Antonio Sanchez <asanchez@hispasec.com>"
reference = "http://laboratorio.blogs.hispasec.com/"
description = "Rule to detect the no presence of any attachment"
strings:
$eml_01 = "From:"
$eml_02 = "To:"
$eml_03 = "Subject:"
$attachment_id = "X-Attachment-Id"
$mime_type = "Content-Type: multipart/mixed"
condition:
all of ( $eml_* ) and
not $attachment_id and
not $mime_type
}