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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_images : mail {
meta:
author = "Antonio Sanchez <asanchez@hispasec.com>"
reference = "http://laboratorio.blogs.hispasec.com/"
description = "Rule to detect the presence of an or several images"
strings:
$eml_01 = "From:"
$eml_02 = "To:"
$eml_03 = "Subject:"
$img_a = ".jpg" nocase
$img_b = ".png" nocase
$img_c = ".bmp" nocase
condition:
all of ( $eml_* ) and
any of ( $img_* )
}
rule without_images : mail {
meta:
author = "Antonio Sanchez <asanchez@hispasec.com>"
reference = "http://laboratorio.blogs.hispasec.com/"
description = "Rule to detect the no presence of any image"
strings:
$eml_01 = "From:"
$eml_02 = "To:"
$eml_03 = "Subject:"
$a = ".jpg" nocase
$b = ".png" nocase
$c = ".bmp" nocase
condition:
all of ( $eml_* ) and
not $a and not $b and not $c
}