diff --git a/chaos_monkey/exploit/elasticgroovy.py b/chaos_monkey/exploit/elasticgroovy.py
index de415aa79..f5a12e3ce 100644
--- a/chaos_monkey/exploit/elasticgroovy.py
+++ b/chaos_monkey/exploit/elasticgroovy.py
@@ -20,8 +20,6 @@ LOG = logging.getLogger(__name__)
 
 
 class ElasticGroovyExploiter(HostExploiter):
-    _target_os_type = ['linux', 'windows']
-
     # attack URLs
     BASE_URL = 'http://%s:%s/_search?pretty'
     MONKEY_RESULT_FIELD = "monkey_result"
@@ -38,6 +36,7 @@ class ElasticGroovyExploiter(HostExploiter):
 
     def __init__(self, host):
         super(ElasticGroovyExploiter, self).__init__(host)
+        self._target_os_type = ['linux', 'windows']
         self._config = __import__('config').WormConfiguration
         self.skip_exist = self._config.skip_exploit_if_file_exist
 
diff --git a/chaos_monkey/exploit/rdpgrinder.py b/chaos_monkey/exploit/rdpgrinder.py
index 34bbba5d7..03fe76ddc 100644
--- a/chaos_monkey/exploit/rdpgrinder.py
+++ b/chaos_monkey/exploit/rdpgrinder.py
@@ -232,10 +232,10 @@ class CMDClientFactory(rdp.ClientFactory):
 
 
 class RdpExploiter(HostExploiter):
-    _target_os_type = ['windows']
 
     def __init__(self, host):
         super(RdpExploiter, self).__init__(host)
+        self._target_os_type = ['windows']
         self._config = __import__('config').WormConfiguration
         self._guid = __import__('config').GUID
 
diff --git a/chaos_monkey/exploit/sambacry.py b/chaos_monkey/exploit/sambacry.py
index d40306b57..db5cae191 100644
--- a/chaos_monkey/exploit/sambacry.py
+++ b/chaos_monkey/exploit/sambacry.py
@@ -31,7 +31,6 @@ class SambaCryExploiter(HostExploiter):
     SambaCry exploit module, partially based on the following implementation by CORE Security Technologies' impacket:
     https://github.com/CoreSecurity/impacket/blob/master/examples/sambaPipe.py
     """
-    _target_os_type = ['linux']
 
     # Name of file which contains the monkey's commandline
     SAMBACRY_COMMANDLINE_FILENAME = "monkey_commandline.txt"
@@ -52,6 +51,7 @@ class SambaCryExploiter(HostExploiter):
 
     def __init__(self, host):
         super(SambaCryExploiter, self).__init__(host)
+        self._target_os_type = ['linux']
         self._config = __import__('config').WormConfiguration
 
     def exploit_host(self):
diff --git a/chaos_monkey/exploit/shellshock.py b/chaos_monkey/exploit/shellshock.py
index 2f6ef3577..5853ff99a 100644
--- a/chaos_monkey/exploit/shellshock.py
+++ b/chaos_monkey/exploit/shellshock.py
@@ -21,14 +21,13 @@ DOWNLOAD_TIMEOUT = 300  # copied from rdpgrinder
 
 
 class ShellShockExploiter(HostExploiter):
-    _target_os_type = ['linux']
-
     _attacks = {
         "Content-type": "() { :;}; echo; "
     }
 
     def __init__(self, host):
         super(ShellShockExploiter, self).__init__(host)
+        self._target_os_type = ['linux']
         self._config = __import__('config').WormConfiguration
         self.HTTP = [str(port) for port in self._config.HTTP_PORTS]
         self.success_flag = ''.join(
diff --git a/chaos_monkey/exploit/smbexec.py b/chaos_monkey/exploit/smbexec.py
index b370ea4ef..8e3a74c59 100644
--- a/chaos_monkey/exploit/smbexec.py
+++ b/chaos_monkey/exploit/smbexec.py
@@ -14,8 +14,6 @@ LOG = getLogger(__name__)
 
 
 class SmbExploiter(HostExploiter):
-    _target_os_type = ['windows']
-
     KNOWN_PROTOCOLS = {
         '139/SMB': (r'ncacn_np:%s[\pipe\svcctl]', 139),
         '445/SMB': (r'ncacn_np:%s[\pipe\svcctl]', 445),
@@ -24,6 +22,7 @@ class SmbExploiter(HostExploiter):
 
     def __init__(self, host):
         super(SmbExploiter, self).__init__(host)
+        self._target_os_type = ['windows']
         self._config = __import__('config').WormConfiguration
         self._guid = __import__('config').GUID
 
diff --git a/chaos_monkey/exploit/sshexec.py b/chaos_monkey/exploit/sshexec.py
index 61b4a3d66..479c1b26b 100644
--- a/chaos_monkey/exploit/sshexec.py
+++ b/chaos_monkey/exploit/sshexec.py
@@ -18,10 +18,10 @@ TRANSFER_UPDATE_RATE = 15
 
 
 class SSHExploiter(HostExploiter):
-    _target_os_type = ['linux', None]
 
     def __init__(self, host):
         super(SSHExploiter, self).__init__(host)
+        self._target_os_type = ['linux', None]
         self._config = __import__('config').WormConfiguration
         self._update_timestamp = 0
         self.skip_exist = self._config.skip_exploit_if_file_exist
diff --git a/chaos_monkey/exploit/win_ms08_067.py b/chaos_monkey/exploit/win_ms08_067.py
index 7d94f4db5..604f4e8cb 100644
--- a/chaos_monkey/exploit/win_ms08_067.py
+++ b/chaos_monkey/exploit/win_ms08_067.py
@@ -152,12 +152,12 @@ class SRVSVC_Exploit(object):
 
 
 class Ms08_067_Exploiter(HostExploiter):
-    _target_os_type = ['windows']
     _windows_versions = {'Windows Server 2003 3790 Service Pack 2': WindowsVersion.Windows2003_SP2,
                          'Windows Server 2003 R2 3790 Service Pack 2': WindowsVersion.Windows2003_SP2}
 
     def __init__(self, host):
         super(Ms08_067_Exploiter, self).__init__(host)
+        self._target_os_type = ['windows']
         self._config = __import__('config').WormConfiguration
         self._guid = __import__('config').GUID
 
diff --git a/chaos_monkey/exploit/wmiexec.py b/chaos_monkey/exploit/wmiexec.py
index 9ce6ff589..f2f3f3432 100644
--- a/chaos_monkey/exploit/wmiexec.py
+++ b/chaos_monkey/exploit/wmiexec.py
@@ -14,10 +14,9 @@ LOG = logging.getLogger(__name__)
 
 
 class WmiExploiter(HostExploiter):
-    _target_os_type = ['windows']
-
     def __init__(self, host):
         super(WmiExploiter, self).__init__(host)
+        self._target_os_type = ['windows']
         self._config = __import__('config').WormConfiguration
         self._guid = __import__('config').GUID