diff --git a/chaos_monkey/exploit/sambacry.py b/chaos_monkey/exploit/sambacry.py
index 3b4477dcf..5c3c5325c 100644
--- a/chaos_monkey/exploit/sambacry.py
+++ b/chaos_monkey/exploit/sambacry.py
@@ -163,14 +163,13 @@ class SambaCryExploiter(HostExploiter):
     def get_credentials_list(self):
         creds = self._config.get_exploit_user_password_or_hash_product()
 
+        creds = [{'username': user, 'password': password, 'lm_hash': lm_hash, 'ntlm_hash': ntlm_hash}
+                 for user, password, lm_hash, ntlm_hash in creds]
+
         # Add empty credentials for anonymous shares.
-        credentials_list = [{'username': '', 'password': '', 'lm_hash': '', 'ntlm_hash': ''}]
+        creds.insert(0, {'username': '', 'password': '', 'lm_hash': '', 'ntlm_hash': ''})
 
-        for user, password, lm_hash, ntlm_hash in creds:
-            credentials_list.append(
-                {'username': user, 'password': password, 'lm_hash': lm_hash, 'ntlm_hash': ntlm_hash})
-
-        return credentials_list
+        return creds
 
     def list_shares(self, smb_client):
         shares = [x['shi1_netname'][:-1] for x in smb_client.listShares()]
diff --git a/chaos_monkey/exploit/smbexec.py b/chaos_monkey/exploit/smbexec.py
index 5c316ba99..98aeaf24e 100644
--- a/chaos_monkey/exploit/smbexec.py
+++ b/chaos_monkey/exploit/smbexec.py
@@ -21,7 +21,7 @@ except ImportError as exc:
     print 'Install the following library to make this script work'
     print 'Impacket : http://oss.coresecurity.com/projects/impacket.html'
     print 'PyCrypto : http://www.amk.ca/python/code/crypto.html'
-    sys.exit(1)
+    raise
 
 LOG = getLogger(__name__)
 
@@ -64,10 +64,10 @@ class SmbExploiter(HostExploiter):
             LOG.info("Can't find suitable monkey executable for host %r", host)
             return False
 
-        user_password_pairs = self._config.get_exploit_user_password_or_hash_product()
+        creds = self._config.get_exploit_user_password_or_hash_product()
 
         exploited = False
-        for user, password, lm_hash, ntlm_hash in user_password_pairs:
+        for user, password, lm_hash, ntlm_hash in creds:
             try:
                 # copy the file remotely using SMB
                 remote_full_path = SmbTools.copy_file(host,
diff --git a/chaos_monkey/exploit/tools.py b/chaos_monkey/exploit/tools.py
index bde32691d..bdb97d975 100644
--- a/chaos_monkey/exploit/tools.py
+++ b/chaos_monkey/exploit/tools.py
@@ -479,9 +479,9 @@ def report_failed_login(exploiter, machine, user, password='', lm_hash='', ntlm_
     telemetry_dict =\
         {'result': False, 'machine': machine.__dict__, 'exploiter': exploiter.__class__.__name__,
          'user': user, 'password': password}
-    if lm_hash != '':
+    if lm_hash:
         telemetry_dict['lm_hash'] = lm_hash
-    if ntlm_hash != '':
+    if ntlm_hash:
         telemetry_dict['ntlm_hash'] = ntlm_hash
 
     ControlClient.send_telemetry('exploit', telemetry_dict)