diff --git a/monkey/common/cloud/aws_instance.py b/monkey/common/cloud/aws_instance.py
index 6b13b69bb..ac4fe633e 100644
--- a/monkey/common/cloud/aws_instance.py
+++ b/monkey/common/cloud/aws_instance.py
@@ -27,16 +27,17 @@ class AwsInstance(object):
 
         try:
             self.instance_id = urllib.request.urlopen(
-                AWS_LATEST_METADATA_URI_PREFIX + 'meta-data/instance-id', timeout=2).read()
+                AWS_LATEST_METADATA_URI_PREFIX + 'meta-data/instance-id', timeout=2).read().decode()
             self.region = self._parse_region(
-                urllib.request.urlopen(AWS_LATEST_METADATA_URI_PREFIX + 'meta-data/placement/availability-zone').read())
+                urllib.request.urlopen(AWS_LATEST_METADATA_URI_PREFIX + 'meta-data/placement/availability-zone').read().
+                    decode())
         except (urllib.error.URLError, IOError) as e:
             logger.debug("Failed init of AwsInstance while getting metadata: {}".format(e))
 
         try:
             self.account_id = self._extract_account_id(
                 urllib.request.urlopen(
-                    AWS_LATEST_METADATA_URI_PREFIX + 'dynamic/instance-identity/document', timeout=2).read())
+                    AWS_LATEST_METADATA_URI_PREFIX + 'dynamic/instance-identity/document', timeout=2).read().decode())
         except (urllib.error.URLError, IOError) as e:
             logger.debug("Failed init of AwsInstance while getting dynamic instance data: {}".format(e))
 
diff --git a/monkey/infection_monkey/exploit/sshexec.py b/monkey/infection_monkey/exploit/sshexec.py
index f7abd3ce0..ce2e0d13c 100644
--- a/monkey/infection_monkey/exploit/sshexec.py
+++ b/monkey/infection_monkey/exploit/sshexec.py
@@ -125,7 +125,7 @@ class SSHExploiter(HostExploiter):
         if not self.host.os.get('type'):
             try:
                 _, stdout, _ = ssh.exec_command('uname -o')
-                uname_os = stdout.read().lower().strip()
+                uname_os = stdout.read().lower().strip().decode()
                 if 'linux' in uname_os:
                     self.host.os['type'] = 'linux'
                 else:
diff --git a/monkey/infection_monkey/exploit/struts2.py b/monkey/infection_monkey/exploit/struts2.py
index 4be2d0acd..fc2fd764d 100644
--- a/monkey/infection_monkey/exploit/struts2.py
+++ b/monkey/infection_monkey/exploit/struts2.py
@@ -79,9 +79,6 @@ class Struts2Exploiter(WebRCE):
                   "(#ros=(@org.apache.struts2.ServletActionContext@getResponse().getOutputStream()))." \
                   "(@org.apache.commons.io.IOUtils@copy(#process.getInputStream(),#ros))." \
                   "(#ros.flush())}" % cmd
-        # Turns payload ascii just for consistency
-        if isinstance(payload, str):
-            payload = unicodedata.normalize('NFKD', payload).encode('ascii', 'ignore')
         headers = {'User-Agent': 'Mozilla/5.0', 'Content-Type': payload}
         try:
             request = urllib.request.Request(url, headers=headers)
@@ -91,6 +88,6 @@ class Struts2Exploiter(WebRCE):
             # If url does not exist
             return False
         except http.client.IncompleteRead as e:
-            page = e.partial
+            page = e.partial.decode()
 
         return page
diff --git a/monkey/infection_monkey/monkey.spec b/monkey/infection_monkey/monkey.spec
index d29adddb1..0ada7f403 100644
--- a/monkey/infection_monkey/monkey.spec
+++ b/monkey/infection_monkey/monkey.spec
@@ -38,6 +38,7 @@ def main():
               debug=False,
               strip=get_exe_strip(),
               upx=True,
+              upx_exclude=['vcruntime140.dll'],
               console=True,
               icon=get_exe_icon())
 
diff --git a/monkey/infection_monkey/network/tools.py b/monkey/infection_monkey/network/tools.py
index 075babb60..0cac7b627 100644
--- a/monkey/infection_monkey/network/tools.py
+++ b/monkey/infection_monkey/network/tools.py
@@ -71,7 +71,7 @@ def check_tcp_port(ip, port, timeout=DEFAULT_TIMEOUT, get_banner=False):
         if get_banner:
             read_ready, _, _ = select.select([sock], [], [], timeout)
             if len(read_ready) > 0:
-                banner = sock.recv(BANNER_READ)
+                banner = sock.recv(BANNER_READ).decode()
     except socket.error:
         pass
 
diff --git a/monkey/infection_monkey/post_breach/actions/communicate_as_new_user.py b/monkey/infection_monkey/post_breach/actions/communicate_as_new_user.py
index 94241e30a..2a1a79b91 100644
--- a/monkey/infection_monkey/post_breach/actions/communicate_as_new_user.py
+++ b/monkey/infection_monkey/post_breach/actions/communicate_as_new_user.py
@@ -38,7 +38,7 @@ class CommunicateAsNewUser(PBA):
                 exit_status = new_user.run_as(ping_commandline)
                 self.send_ping_result_telemetry(exit_status, ping_commandline, username)
         except subprocess.CalledProcessError as e:
-            PostBreachTelem(self, (e.output, False)).send()
+            PostBreachTelem(self, (e.output.decode(), False)).send()
         except NewUserError as e:
             PostBreachTelem(self, (str(e), False)).send()
 
diff --git a/monkey/infection_monkey/post_breach/pba.py b/monkey/infection_monkey/post_breach/pba.py
index 8d7723df2..73b8a3221 100644
--- a/monkey/infection_monkey/post_breach/pba.py
+++ b/monkey/infection_monkey/post_breach/pba.py
@@ -14,6 +14,7 @@ __author__ = 'VakarisZ'
 
 EXECUTION_WITHOUT_OUTPUT = "(PBA execution produced no output)"
 
+
 class PBA(object):
     """
     Post breach action object. Can be extended to support more than command execution on target machine.
@@ -75,13 +76,13 @@ class PBA(object):
         :return: Tuple of command's output string and boolean, indicating if it succeeded
         """
         try:
-            output = subprocess.check_output(self.command, stderr=subprocess.STDOUT, shell=True)
+            output = subprocess.check_output(self.command, stderr=subprocess.STDOUT, shell=True).decode()
             if not output:
                 output = EXECUTION_WITHOUT_OUTPUT
             return output, True
         except subprocess.CalledProcessError as e:
             # Return error output of the command
-            return e.output, False
+            return e.output.decode(), False
 
     @staticmethod
     def choose_command(linux_cmd, windows_cmd):
diff --git a/monkey/monkey_island/cc/resources/remote_run.py b/monkey/monkey_island/cc/resources/remote_run.py
index 675c292c1..c41699add 100644
--- a/monkey/monkey_island/cc/resources/remote_run.py
+++ b/monkey/monkey_island/cc/resources/remote_run.py
@@ -34,10 +34,10 @@ class RemoteRun(flask_restful.Resource):
                 try:
                     resp['instances'] = AwsService.get_instances()
                 except NoCredentialsError as e:
-                    resp['error'] = NO_CREDS_ERROR_FORMAT.format(e.message)
+                    resp['error'] = NO_CREDS_ERROR_FORMAT.format(e)
                     return jsonify(resp)
                 except ClientError as e:
-                    resp['error'] = CLIENT_ERROR_FORMAT.format(e.message)
+                    resp['error'] = CLIENT_ERROR_FORMAT.format(e)
                     return jsonify(resp)
             return jsonify(resp)
 
diff --git a/monkey/monkey_island/cc/services/attack/technique_reports/__init__.py b/monkey/monkey_island/cc/services/attack/technique_reports/__init__.py
index b5f100bd1..b9a2fd795 100644
--- a/monkey/monkey_island/cc/services/attack/technique_reports/__init__.py
+++ b/monkey/monkey_island/cc/services/attack/technique_reports/__init__.py
@@ -12,28 +12,32 @@ logger = logging.getLogger(__name__)
 class AttackTechnique(object, metaclass=abc.ABCMeta):
     """ Abstract class for ATT&CK report components """
 
-    @abc.abstractproperty
+    @property
+    @abc.abstractmethod
     def unscanned_msg(self):
         """
         :return: Message that will be displayed in case attack technique was not scanned.
         """
         pass
 
-    @abc.abstractproperty
+    @property
+    @abc.abstractmethod
     def scanned_msg(self):
         """
         :return: Message that will be displayed in case attack technique was scanned.
         """
         pass
 
-    @abc.abstractproperty
+    @property
+    @abc.abstractmethod
     def used_msg(self):
         """
         :return: Message that will be displayed in case attack technique was used by the scanner.
         """
         pass
 
-    @abc.abstractproperty
+    @property
+    @abc.abstractmethod
     def tech_id(self):
         """
         :return: Message that will be displayed in case of attack technique not being scanned.