Update KSQL Post Additions

docker/helk-kibana-analysis-basic.yml

@@ -100,7 +100,7 @@ services:
       REPLICATION_FACTOR: 1
       ADVERTISED_LISTENER: ${ADVERTISED_LISTENER}
       ZOOKEEPER_NAME: helk-zookeeper
-      KAFKA_CREATE_TOPICS: winlogbeat
+      KAFKA_CREATE_TOPICS: winlogbeat, SYSMON_JOIN
       KAFKA_HEAP_OPTS: -Xmx1G -Xms1G
       LOG_RETENTION_HOURS: 4 
     ports:
@@ -108,7 +108,7 @@ services:
     networks:
       helk:
   helk-ksql-server:
-    image: confluentinc/cp-ksql-server:5.0.1
+    image: confluentinc/cp-ksql-server:5.1.0
     container_name: helk-ksql-server
     restart: always
     depends_on:
@@ -127,7 +127,7 @@ services:
     networks:
       helk:
   helk-ksql-cli:
-    image: confluentinc/cp-ksql-cli:5.0.1
+    image: confluentinc/cp-ksql-cli:5.1.0
     container_name: helk-ksql-cli
     depends_on:
       - helk-kafka-broker

docker/helk-kibana-analysis-trial.yml

@@ -105,7 +105,7 @@ services:
       REPLICATION_FACTOR: 1
       ADVERTISED_LISTENER: ${ADVERTISED_LISTENER}
       ZOOKEEPER_NAME: helk-zookeeper
-      KAFKA_CREATE_TOPICS: winlogbeat
+      KAFKA_CREATE_TOPICS: winlogbeat, SYSMON_JOIN
       KAFKA_HEAP_OPTS: -Xmx1G -Xms1G
       LOG_RETENTION_HOURS: 4 
     ports:
@@ -113,7 +113,7 @@ services:
     networks:
       helk:
   helk-ksql-server:
-    image: confluentinc/cp-ksql-server:5.0.1
+    image: confluentinc/cp-ksql-server:5.1.0
     container_name: helk-ksql-server
     restart: always
     depends_on:
@@ -132,7 +132,7 @@ services:
     networks:
       helk:
   helk-ksql-cli:
-    image: confluentinc/cp-ksql-cli:5.0.1
+    image: confluentinc/cp-ksql-cli:5.1.0
     container_name: helk-ksql-cli
     depends_on:
       - helk-kafka-broker

docker/helk-kibana-notebook-analysis-basic.yml

@@ -140,7 +140,7 @@ services:
       REPLICATION_FACTOR: 1
       ADVERTISED_LISTENER: ${ADVERTISED_LISTENER}
       ZOOKEEPER_NAME: helk-zookeeper
-      KAFKA_CREATE_TOPICS: winlogbeat
+      KAFKA_CREATE_TOPICS: winlogbeat, SYSMON_JOIN
       KAFKA_HEAP_OPTS: -Xmx1G -Xms1G
       LOG_RETENTION_HOURS: 4 
     ports:
@@ -148,7 +148,7 @@ services:
     networks:
       helk:
   helk-ksql-server:
-    image: confluentinc/cp-ksql-server:5.0.1
+    image: confluentinc/cp-ksql-server:5.1.0
     container_name: helk-ksql-server
     restart: always
     depends_on:
@@ -167,7 +167,7 @@ services:
     networks:
       helk:
   helk-ksql-cli:
-    image: confluentinc/cp-ksql-cli:5.0.1
+    image: confluentinc/cp-ksql-cli:5.1.0
     container_name: helk-ksql-cli
     depends_on:
       - helk-kafka-broker

docker/helk-kibana-notebook-analysis-trial.yml

@@ -145,7 +145,7 @@ services:
       REPLICATION_FACTOR: 1
       ADVERTISED_LISTENER: ${ADVERTISED_LISTENER}
       ZOOKEEPER_NAME: helk-zookeeper
-      KAFKA_CREATE_TOPICS: winlogbeat
+      KAFKA_CREATE_TOPICS: winlogbeat, SYSMON_JOIN
       KAFKA_HEAP_OPTS: -Xmx1G -Xms1G
       LOG_RETENTION_HOURS: 4 
     ports:
@@ -153,7 +153,7 @@ services:
     networks:
       helk:
   helk-ksql-server:
-    image: confluentinc/cp-ksql-server:5.0.1
+    image: confluentinc/cp-ksql-server:5.1.0
     container_name: helk-ksql-server
     restart: always
     depends_on:
@@ -172,7 +172,7 @@ services:
     networks:
       helk:
   helk-ksql-cli:
-    image: confluentinc/cp-ksql-cli:5.0.1
+    image: confluentinc/cp-ksql-cli:5.1.0
     container_name: helk-ksql-cli
     depends_on:
       - helk-kafka-broker

docker/helk-kibana/scripts/basic/kibana-setup.sh

@@ -33,7 +33,7 @@ while [[ -z $(grep "Server running at http://$KIBANA" /usr/share/kibana/config/k
 done
 
 # *********** Creating Kibana index-patterns ***************
-declare -a index_patterns=("logs-endpoint-*" "logs-*" "logs-endpoint-winevent-sysmon-*" "logs-endpoint-winevent-security-*" "logs-endpoint-winevent-system-*" "logs-endpoint-winevent-application-*" "logs-endpoint-winevent-wmiactivity-*" "logs-endpoint-winevent-powershell-*" "mitre-attack-*" "elastalert_status" "elastalert_status_status" "elastalert_status_error" "elastalert_status_silence" "elastalert_status_past")
+declare -a index_patterns=("logs-endpoint-*" "logs-*" "logs-endpoint-winevent-sysmon-*" "logs-endpoint-winevent-security-*" "logs-endpoint-winevent-system-*" "logs-endpoint-winevent-application-*" "logs-endpoint-winevent-wmiactivity-*" "logs-endpoint-winevent-powershell-*" "mitre-attack-*" "elastalert_status" "elastalert_status_status" "elastalert_status_error" "elastalert_status_silence" "elastalert_status_past" "sysmon-join-*")
 
 echo "[+++] Creating Kibana Index Patterns..."
 for index in ${!index_patterns[@]}; do

docker/helk-kibana/scripts/trial/kibana-setup.sh

@@ -34,7 +34,7 @@ while [[ -z $(grep "Server running at http://$KIBANA" /usr/share/kibana/config/k
 done
 
 # *********** Creating Kibana index-patterns ***************
-declare -a index_patterns=("logs-endpoint-*" "logs-*" "logs-endpoint-winevent-sysmon-*" "logs-endpoint-winevent-security-*" "logs-endpoint-winevent-system-*" "logs-endpoint-winevent-application-*" "logs-endpoint-winevent-wmiactivity-*" "logs-endpoint-winevent-powershell-*" "mitre-attack-*" "elastalert_status" "elastalert_status_status" "elastalert_status_error" "elastalert_status_silence" "elastalert_status_past")
+declare -a index_patterns=("logs-endpoint-*" "logs-*" "logs-endpoint-winevent-sysmon-*" "logs-endpoint-winevent-security-*" "logs-endpoint-winevent-system-*" "logs-endpoint-winevent-application-*" "logs-endpoint-winevent-wmiactivity-*" "logs-endpoint-winevent-powershell-*" "mitre-attack-*" "elastalert_status" "elastalert_status_status" "elastalert_status_error" "elastalert_status_silence" "elastalert_status_past" "sysmon-join-*")
 
 echo "[+++] Creating Kibana Index Patterns..."
 for index in ${!index_patterns[@]}; do

docker/helk-ksql/sysmon-join.commands

@@ -0,0 +1,166 @@
+CREATE STREAM WINLOGBEAT_STREAM \
+(source_name VARCHAR, \
+type VARCHAR, \
+task VARCHAR, \
+log_name VARCHAR, \
+computer_name VARCHAR, \
+event_data STRUCT< \
+  UtcTime VARCHAR, \
+  ProcessGuid VARCHAR, \
+  ProcessId INTEGER, \
+  Image VARCHAR, \
+  FileVersion VARCHAR, \
+  Description VARCHAR, \
+  Product VARCHAR, \
+  Company VARCHAR, \
+  CommandLine VARCHAR, \
+  CurrentDirectory VARCHAR, \
+  User VARCHAR, \
+  LogonGuid VARCHAR, \
+  LogonId VARCHAR, \
+  TerminalSessionId INTEGER, \
+  IntegrityLevel VARCHAR, \
+  Hashes VARCHAR, \
+  ParentProcessGuid VARCHAR, \
+  ParentProcessId INTEGER, \
+  ParentImage VARCHAR, \
+  ParentCommandLine VARCHAR, \
+  Protocol VARCHAR, \
+  Initiated VARCHAR, \
+  SourceIsIpv6 VARCHAR, \
+  SourceIp VARCHAR, \
+  SourceHostname VARCHAR, \
+  SourcePort INTEGER, \
+  SourcePortName VARCHAR, \
+  DestinationIsIpv6 VARCHAR, \
+  DestinationIp VARCHAR, \
+  DestinationHostname VARCHAR, \
+  DestinationPort INTEGER, \
+  DestinationPortName VARCHAR>, \
+event_id INTEGER) \
+WITH (KAFKA_TOPIC='winlogbeat', VALUE_FORMAT='JSON');
+
+CREATE STREAM WINLOGBEAT_STREAM_REKEY \
+WITH (VALUE_FORMAT='JSON', PARTITIONS=1, TIMESTAMP='event_date_creation') \
+AS SELECT \
+STRINGTOTIMESTAMP(event_data->UtcTime, 'yyyy-MM-dd HH:mm:ss.SSS') AS event_date_creation, \
+event_data->ProcessGuid AS process_guid, \
+event_data->ProcessId AS process_id, \
+event_data->Image AS process_path, \
+event_data->FileVersion AS file_version, \
+event_data->Description AS file_description, \
+event_data->Company AS file_company, \
+event_data->CommandLine AS process_command_line, \
+event_data->CurrentDirectory AS process_current_directory, \
+event_data->User AS user_account, \
+event_data->LogonGuid AS user_logon_guid, \
+event_data->LogonId AS user_logon_id, \
+event_data->TerminalSessionId AS user_session_id, \
+event_data->IntegrityLevel AS process_integrity_level, \
+event_data->Hashes AS hashes, \
+event_data->ParentProcessGuid AS parent_process_guid, \
+event_data->ParentProcessId AS parent_process_id, \
+event_data->ParentImage AS parent_process_path, \
+event_data->ParentCommandLine AS parent_process_command_line, \
+event_data->Protocol AS network_protocol, \
+event_data->Initiated AS network_connection_initiated, \
+event_data->SourceIsIpv6 AS src_is_ipv6, \
+event_data->SourceIp AS src_ip_addr, \
+event_data->SourceHostname AS src_host_name, \
+event_data->SourcePort AS src_port, \
+event_data->SourcePortName AS src_port_name, \
+event_data->DestinationIsIpv6 AS dst_is_ipv6, \
+event_data->DestinationIp AS dst_ip_addr, \
+event_data->DestinationHostname AS dst_host_name, \
+event_data->DestinationPort AS dst_port, \
+event_data->DestinationPortName AS dst_port_name, \
+event_id, \
+source_name, \
+log_name \
+FROM WINLOGBEAT_STREAM WHERE source_name='Microsoft-Windows-Sysmon' PARTITION BY process_guid;
+
+CREATE STREAM SYSMON_PROCESS_CREATE WITH (VALUE_FORMAT='JSON', PARTITIONS=1, TIMESTAMP='event_date_creation') \
+AS SELECT \
+event_date_creation, \
+process_guid, \
+process_id, \
+process_path, \
+file_version, \
+file_description, \
+file_company, \
+process_command_line, \
+process_current_directory, \
+user_account, \
+user_logon_guid, \
+user_logon_id, \
+user_session_id, \
+process_integrity_level, \
+hashes, \
+parent_process_guid, \
+parent_process_id, \
+parent_process_path, \
+parent_process_command_line, \
+event_id, \
+source_name, \
+log_name \
+FROM WINLOGBEAT_STREAM_REKEY WHERE event_id=1;
+
+CREATE STREAM SYSMON_NETWORK_CONNECT WITH (VALUE_FORMAT='JSON', PARTITIONS=1, TIMESTAMP='event_date_creation') \
+AS SELECT \
+event_date_creation, \
+process_guid, \
+process_id, \
+process_path, \
+user_account, \
+network_protocol, \
+network_connection_initiated, \
+src_is_ipv6, \
+src_ip_addr, \
+src_host_name, \
+src_port, \
+src_port_name, \
+dst_is_ipv6, \
+dst_ip_addr, \
+dst_host_name, \
+dst_port, \
+dst_port_name, \
+event_id, \
+source_name, \
+log_name \
+FROM WINLOGBEAT_STREAM_REKEY WHERE event_id=3;
+
+CREATE TABLE SYSMON_PROCESS_CREATE_TABLE \
+(event_date_creation VARCHAR, \
+process_guid VARCHAR, \
+process_id INTEGER, \
+process_path VARCHAR, \
+file_version VARCHAR, \
+file_description VARCHAR, \
+file_company VARCHAR, \
+process_command_line VARCHAR, \
+process_current_directory VARCHAR, \
+user_account VARCHAR, \
+user_logon_guid VARCHAR, \
+user_logon_id VARCHAR, \
+user_session_id INTEGER, \
+process_integrity_level VARCHAR, \
+hashes VARCHAR, \
+parent_process_guid VARCHAR, \
+parent_process_id INTEGER, \
+parent_process_path VARCHAR, \
+parent_process_command_line VARCHAR, \
+event_id INTEGER, \
+source_name VARCHAR, \
+log_name VARCHAR) \
+WITH (KAFKA_TOPIC='SYSMON_PROCESS_CREATE', VALUE_FORMAT='JSON', KEY='process_guid');
+
+CREATE STREAM SYSMON_JOIN WITH (PARTITIONS=1) AS \
+SELECT N.EVENT_DATE_CREATION, N.PROCESS_GUID, N.PROCESS_ID, N.PROCESS_PATH, N.USER_ACCOUNT, \
+N.NETWORK_PROTOCOL, N.NETWORK_CONNECTION_INITIATED, N.SRC_IS_IPV6, N.SRC_IP_ADDR, \
+N.SRC_HOST_NAME, N.SRC_PORT, N.SRC_PORT_NAME, N.DST_IS_IPV6, N.DST_IP_ADDR, N.DST_HOST_NAME, \
+N.DST_PORT, N.DST_PORT_NAME, N.SOURCE_NAME, N.LOG_NAME, \
+P.PROCESS_COMMAND_LINE, P.HASHES, P.PARENT_PROCESS_PATH, P.PARENT_PROCESS_COMMAND_LINE, \
+P.USER_LOGON_GUID, P.USER_LOGON_ID, P.USER_SESSION_ID, P.PROCESS_CURRENT_DIRECTORY, \
+P.PROCESS_INTEGRITY_LEVEL, P.PARENT_PROCESS_GUID, P.PARENT_PROCESS_ID \
+FROM SYSMON_NETWORK_CONNECT N INNER JOIN SYSMON_PROCESS_CREATE_TABLE P \
+ON N.PROCESS_GUID = P.PROCESS_GUID;

docker/helk-logstash/pipeline/0002-kafka-input.conf

@@ -6,7 +6,7 @@
 input {
   kafka {
     bootstrap_servers => "helk-kafka-broker:9092"
-    topics => ["winlogbeat"]
+    topics => ["winlogbeat", "SYSMON_JOIN"]
     decorate_events => true
     codec => "json"
     auto_offset_reset => "earliest"

docker/helk-logstash/pipeline/1531-winevent-sysmon-filter.conf

@@ -70,6 +70,7 @@ filter {
           "ParentCommandLine" => "process_parent_command_line"
           "IntegrityLevel" => "process_integrity_level"
           "LogonGuid" => "user_logon_guid"
+          "LogonIdd" => "user_logon_id"
           "ParentProcessGuid" => "process_parent_guid"
           "ParentProcessId" => "process_parent_id"
           "TerminalSessionId" => "user_session_id"

docker/helk-logstash/pipeline/9957-winevent-sysmon-join-output.conf

@@ -0,0 +1,15 @@
+# HELK sysmon-join output conf file
+# HELK build Stage: Alpha
+# Author: Roberto Rodriguez (@Cyb3rWard0g)
+# License: GPL-3.0
+
+output {
+  if [@metadata][kafka][topic] == "SYSMON_JOIN" {
+    elasticsearch {
+      hosts => ["helk-elasticsearch:9200"]
+      index => "sysmon-join-%{+YYYY.MM.dd}"
+      user => 'elastic'
+      #password => 'elasticpassword'
+    }
+  }
+}

docker/helk-logstash/scripts/basic/logstash-entrypoint.sh

@@ -14,8 +14,8 @@ echo "[HELK-ES-DOCKER-INSTALLATION-INFO] Setting Elasticsearch URL to $ELASTICSE
 
 # ********* Setting LS_JAVA_OPTS ***************
 if [[ -z "$LS_JAVA_OPTS" ]]; then
-    LS_MEMORY=$(awk '/MemAvailable/{printf "%.f", $2/1024/1024/2}' /proc/meminfo)
+    LS_MEMORY=$(awk '/MemAvailable/{printf "%.f", $2/1024/4}' /proc/meminfo)
-    LS_JAVA_OPTS="-Xms${LS_MEMORY}g -Xmx${LS_MEMORY}g"
+    export LS_JAVA_OPTS="-Xms${LS_MEMORY}m -Xmx${LS_MEMORY}m"
 fi
 echo "[HELK-DOCKER-INSTALLATION-INFO] Setting LS_JAVA_OPTS to $LS_JAVA_OPTS"
 

docker/helk_install.sh

@@ -197,8 +197,15 @@ install_docker_compose(){
 set_elasticsearch_password(){
     if [[ -z "$ELASTICSEARCH_PASSWORD_INPUT" ]] && [[ $SUBSCRIPTION_CHOICE == "trial" ]]; then
         while true; do
-            read -p "[HELK-INSTALLATION-INFO] Set HELK Elasticsearch Password: " ELASTICSEARCH_PASSWORD_INPUT
+            read -t 30 -p "[HELK-INSTALLATION-INFO] Set HELK Elasticsearch Password: " -e -i "elasticpassword" ELASTICSEARCH_PASSWORD_INPUT
+            READ_INPUT=$?
+            ELASTICSEARCH_PASSWORD_INPUT=${ELASTICSEARCH_PASSWORD_INPUT:-"elasticpassword"}
+            if [ $READ_INPUT = 142 ]; then
+                echo -e "\n[HELK-INSTALLATION-INFO] HELK elasticsearch password set to ${ELASTICSEARCH_PASSWORD_INPUT}"
+                break
+            else
                 read -p "[HELK-INSTALLATION-INFO] Verify HELK Elasticsearch Password: " ELASTICSEARCH_PASSWORD_INPUT_VERIFIED
+                echo -e "[HELK-INSTALLATION-INFO] HELK elasticsearch password set to ${ELASTICSEARCH_PASSWORD_INPUT}"
                 # *********** Validating Password Input ***************
                 if [[ "$ELASTICSEARCH_PASSWORD_INPUT" == "$ELASTICSEARCH_PASSWORD_INPUT_VERIFIED" ]]; then 
                     break
@@ -206,6 +213,7 @@ set_elasticsearch_password(){
                     echo -e "${RED}Error...${STD}"
                     echo "[HELK-INSTALLATION-INFO] Your password values do not match.."
                 fi
+            fi
         done
         export ELASTIC_PASSWORD=$ELASTICSEARCH_PASSWORD_INPUT
     elif [[ "$ELASTICSEARCH_PASSWORD_INPUT" ]] && [[ $SUBSCRIPTION_CHOICE == "trial" ]]; then
@@ -217,8 +225,15 @@ set_elasticsearch_password(){
 set_kibana_ui_password(){
     if [[ -z "$KIBANA_UI_PASSWORD_INPUT" ]]; then
         while true; do
-            read -p "[HELK-INSTALLATION-INFO] Set HELK Kibana UI Password: " KIBANA_UI_PASSWORD_INPUT
+            read -t 30 -p "[HELK-INSTALLATION-INFO] Set HELK Kibana UI Password: " -e -i "hunting" KIBANA_UI_PASSWORD_INPUT
+            READ_INPUT=$?
+            KIBANA_UI_PASSWORD_INPUT=${KIBANA_UI_PASSWORD_INPUT:-"hunting"}
+            if [ $READ_INPUT = 142 ]; then
+                echo -e "\n[HELK-INSTALLATION-INFO] HELK Kibana UI password set to ${KIBANA_UI_PASSWORD_INPUT}"
+                break
+            else
                 read -p "[HELK-INSTALLATION-INFO] Verify HELK Kibana UI Password: " KIBANA_UI_PASSWORD_INPUT_VERIFIED
+                echo -e "[HELK-INSTALLATION-INFO] HELK Kibana UI password set to ${KIBANA_UI_PASSWORD_INPUT}"
                 # *********** Validating Password Input ***************
                 if [[ "$KIBANA_UI_PASSWORD_INPUT" == "$KIBANA_UI_PASSWORD_INPUT_VERIFIED" ]]; then 
                     break
@@ -226,6 +241,7 @@ set_kibana_ui_password(){
                     echo -e "${RED}Error...${STD}"
                     echo "[HELK-INSTALLATION-INFO] Your password values do not match.."
                 fi
+            fi
         done
     fi
     if [[ $SUBSCRIPTION_CHOICE == "basic" ]]; then
@@ -263,7 +279,13 @@ set_network(){
         # *********** Accepting Defaults or Allowing user to set the HELK IP ***************
         local ip_choice
         read -t 30 -p "[HELK-INSTALLATION-INFO] Set HELK IP. Default value is your current IP: " -e -i ${HOST_IP} ip_choice
+        READ_INPUT=$?
         HOST_IP="${ip_choice:-$HOST_IP}"
+        if [ $READ_INPUT  = 142 ]; then
+            echo -e "\n[HELK-INSTALLATION-INFO] HELK IP set to ${HOST_IP}"
+        else
+            echo "[HELK-INSTALLATION-INFO] HELK IP set to ${HOST_IP}"
+        fi
     fi
 }
 
@@ -288,8 +310,14 @@ set_helk_subscription(){
         # *********** Accepting Defaults or Allowing user to set HELK subscription ***************
         while true; do
             local subscription_input
-            read -t 30 -p "[HELK-INSTALLATION-INFO] Set HELK elastic subscription (basic or trial). Default value is basic: " -e -i "basic" subscription_input
+            read -t 30 -p "[HELK-INSTALLATION-INFO] Set HELK elastic subscription (basic or trial): " -e -i "basic" subscription_input
+            READ_INPUT=$?
             SUBSCRIPTION_CHOICE=${subscription_input:-"basic"}
+            if [ $READ_INPUT = 142 ]; then
+                echo -e "\n[HELK-INSTALLATION-INFO] HELK elastic subscription set to ${SUBSCRIPTION_CHOICE}"
+                break
+            else
+                echo "[HELK-INSTALLATION-INFO] HELK elastic subscription set to ${SUBSCRIPTION_CHOICE}"
                 # *********** Validating subscription Input ***************
                 case $SUBSCRIPTION_CHOICE in
                     basic) break;;
@@ -299,6 +327,7 @@ set_helk_subscription(){
                         echo "[HELK-INSTALLATION-ERROR] Not a valid subscription. Valid Options: basic or trial"
                     ;;
                 esac
+            fi
         done
     fi
 }
@@ -317,7 +346,14 @@ set_helk_build(){
             echo " "
 
             local CONFIG_CHOICE
-            read -p "Enter build choice [ 1 - 2] " CONFIG_CHOICE
+            read -t 30 -p "Enter build choice [ 1 - 2]: " -e -i "1" CONFIG_CHOICE
+            READ_INPUT=$?
+            HELK_BUILD=${CONFIG_CHOICE:-"helk-kibana-analysis"}
+            if [ $READ_INPUT = 142 ]; then
+                echo -e "\n[HELK-INSTALLATION-INFO] HELK build set to ${HELK_BUILD}"
+                break
+            else
+                echo "[HELK-INSTALLATION-INFO] HELK build set to ${HELK_BUILD}"
                 case $CONFIG_CHOICE in
                     1) HELK_BUILD='helk-kibana-analysis';break ;;
                     2) HELK_BUILD='helk-kibana-notebook-analysis';break;;
@@ -326,14 +362,13 @@ set_helk_build(){
                         echo "[HELK-INSTALLATION-ERROR] Not a valid build"
                     ;;
                 esac
+            fi
         done
     fi
 }
 
 # *********** Install and set up pre-requirements ***************
 prepare_helk(){
-    echo "[HELK-INSTALLATION-INFO] HELK IP set to ${HOST_IP}"
-    echo "[HELK-INSTALLATION-INFO] HELK elastic subscription set to ${SUBSCRIPTION_CHOICE}"
     if [ "$SYSTEM_KERNEL" == "Linux" ]; then
         # *********** Check if curl is installed ***************
         if ! [ -x "$(command -v curl)" ]; then