diff --git a/malware-tech_ref_and_memo.md b/malware-tech_ref_and_memo.md
index 2fc33d4..ed7dd92 100644
--- a/malware-tech_ref_and_memo.md
+++ b/malware-tech_ref_and_memo.md
@@ -263,3 +263,8 @@ New-Object System.IO.Compression.DeflateStream([iO.mEmoRySTream] [sysTEM.ConVert
 
 **ref:**<br>
 [Fast Flux networks: What are they and how do they work?](https://www.welivesecurity.com/2017/01/12/fast-flux-networks-work/)
+
+# Shell Backdoor
+- Web Shell等 
+- 様々なShell Backdoor(PHP/ASP)<br>
+[Shell Backdoor List - PHP / ASP Shell Backdoor List](https://www.kitploit.com/2020/01/shell-backdoor-list-php-asp-shell.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+PentestTools+%28PenTest+Tools%29)