Sneed-Reactivity/yara-Neo23x0/gen_ps1_shellcode.yar

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rule Base64_PS1_Shellcode {
meta:
description = "Detects Base64 encoded PS1 Shellcode"
author = "Nick Carr, David Ledbetter"
reference = "https://twitter.com/ItsReallyNick/status/1062601684566843392"
date = "2018-11-14"
score = 65
id = "7c3cec3b-a192-5bfd-b4f1-22b1afeb717e"
strings:
$substring = "AAAAYInlM"
$pattern1 = "/OiCAAAAYInlM"
$pattern2 = "/OiJAAAAYInlM"
condition:
$substring and 1 of ($p*)
}