/*
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 Korplug_FAST {
meta:
description = "Rule to detect Korplug/PlugX FAST variant"
author = "Florian Roth"
date = "2015-08-20"
hash = "c437465db42268332543fbf6fd6a560ca010f19e0fd56562fb83fb704824b371"
strings:
$x1 = "%s\\rundll32.exe \"%s\", ShadowPlay" fullword ascii
$a1 = "ShadowPlay" fullword ascii
$s1 = "%s\\rundll32.exe \"%s\"," fullword ascii
$s2 = "nvdisps.dll" fullword ascii
$s3 = "%snvdisps.dll" fullword ascii
$s4 = "\\winhlp32.exe" fullword ascii
$s5 = "nvdisps_user.dat" fullword ascii
$s6 = "%snvdisps_user.dat" fullword ascii
condition:
uint16(0) == 0x5a4d and filesize < 500KB and
(
$x1 or
($a1 and 1 of ($s*)) or
4 of ($s*)
)
}