Sneed-Reactivity/yara-Neo23x0/mal_cryp_rat.yar

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import "pe"
rule MAL_CrypRAT_Jan19_1 {
meta:
description = "Detects CrypRAT"
author = "Florian Roth (Nextron Systems)"
license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
reference = "Internal Research"
score = 90
date = "2019-01-07"
id = "f3063a16-8813-5d6c-9807-6a0725907fb5"
strings:
$x1 = "Cryp_RAT" fullword wide
condition:
uint16(0) == 0x5a4d and filesize < 600KB and (
pe.imphash() == "2524e5e9fe04d7bfe5efb3a5e400fe4b" or
1 of them
)
}