If you've ever wondered how messaging apps like Telegram and WhatsApp work behind the scenes of your conversations, this article is for you. We'll explore a method to discover the IP address of the user we're interacting with on Telegram, using the powerful network traffic analysis tool Wireshark.
Step 1: Downloading Wireshark
Before we begin, you need to download and install Wireshark on your computer. You can find the download on the official Wireshark website.
Make sure to choose the version that is compatible with your operating system.
Step 2: Filtering STUN Traffic
After opening Wireshark, you'll see an interface capturing real-time network traffic. Let's filter the STUN traffic, which is the protocol used by Telegram for communication.
In the filter bar, click on the search icon to open the search option. Then select the "String" option and type "XOR-MAPPED-ADDRESS" in the search line.
Step 3: Initiating Data Capture
Now, we're ready to start capturing data. Ensure Wireshark is running and make a call via Telegram to the user whose IP address you want to discover.
Once the user answers the call, Wireshark will start displaying the captured data. Look through the list for information related to the STUN protocol, and you'll find the IP address of the user who received the call.
Step 4: Identifying the IP Address
To easily identify the desired IP address, use the Wireshark search function. Click on the "Find" option and type "XOR-MAPPED-ADDRESS" in the search line. The user's IP address will immediately appear after that string.
Automating with Golang
Using the Golang programming language, we can automate the entire process described above. Below is a Golang code that performs this task efficiently and reliably:
package main
import (
"fmt"
"log"
"os"
"os/exec"
"strings"
)
func main() {
const CAP_PATH = "/tmp/tg_cap.pcap" // Temporary path for pcap capture file
const CAP_TEXT = "/tmp/tg_text.txt" // Temporary path for text file with information
const CAP_DURATION = "5" // Capture duration in seconds
// Get the external IP address of the device
ipCmd := exec.Command("curl", "-s", "icanhazip.com")
ipOutput, err := ipCmd.Output()
if err != nil {
log.Fatal("Failed to get IP address:", err)
}
MY_IP := strings.TrimSpace(string(ipOutput))
// Check if Wireshark is installed
_, err = exec.LookPath("tshark")
if err != nil {
log.Println("[-] Wireshark not found. Try installing Wireshark first.")
log.Println("[+] Debian-based: sudo apt-get install -y tshark")
log.Println("[+] RedHat-based: sudo yum install -y tshark")
os.Exit(1)
}
fmt.Println("[+] Discovering User's IP Address on Telegram using Golang")
fmt.Println("[+] Starting traffic capture. Please wait for", CAP_DURATION, "seconds...")
// Start traffic capture with Wireshark
captureCmd := exec.Command("tshark", "-w", CAP_PATH, "-a", "duration:"+CAP_DURATION)
captureOutput, err := captureCmd.CombinedOutput()
if err != nil {
log.Fatal("Traffic capture error:", err)
}
fmt.Println("[+] Traffic captured.")
// Convert pcap file to readable text file
convertCmd := exec.Command("tshark", "-r", CAP_PATH)
convertOutput, err := convertCmd.Output()
if err != nil {
log.Fatal("Error converting pcap file to text:", err)
}
err = os.WriteFile(CAP_TEXT, convertOutput, 0644)
if err != nil {
log.Fatal("Error writing text file:", err)
}
fmt.Println("[+] Pcap file successfully converted to text.")
// Check if Telegram traffic is present in the text file
if strings.Contains(string(convertOutput), "STUN 106") {
fmt.Println("[+] Telegram traffic found.")
// Extract the IP address from the text
extractCmd := exec.Command("cat", CAP_TEXT, "|", "grep", "STUN 106", "|", "sed", "'s/^.*XOR-MAPPED-ADDRESS: //'", "|", "awk", "'{match($0,/[0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+/); ip = substr($0,RSTART,RLENGTH); print ip}' | awk '!seen[$0]++'")
extractOutput, err := extractCmd.Output()
if err != nil {
log.Fatal("Error extracting IP address:", err)
}
TG_OUT := strings.TrimSpace(string(extractOutput))
IP_1 := strings.Fields(TG_OUT)[0]
IP_2 := strings.Fields(TG_OUT)[1]
var IP string
// Check if the IP address is ours or the recipient's
if MY_IP == IP_1 {
IP = IP_2
} else if MY_IP == IP_2 {
IP = IP_1
} else {
IP = "[-] Sorry. IP address not found."
os.Exit(1)
}
// Get host information for the IP address
hostCmd := exec.Command("host", IP)
hostOutput, err := hostCmd.Output()
if err != nil {
log.Fatal("Error getting host information:", err)
}
fmt.Println("[+]")
fmt.Println("[+] IP Address:", IP)
fmt.Println("[+] Host:", strings.TrimSpace(string(hostOutput)))
fmt.Println("[+]")
// Clean up temporary files
err = os.Remove(CAP_PATH)
if err != nil {
log.Fatal("Cleanup error:", err)
}
err = os.Remove(CAP_TEXT)
if err != nil {
log.Fatal("Cleanup error:", err)
}
fmt.Println("[+] Cleanup completed.")
} else {
fmt.Println("[-] Telegram traffic not found.")
fmt.Println("[!]")
fmt.Println("[!] Run this script only >>>AFTER<<< the response.")
fmt.Println("[!]")
os.Exit(1)
}
fmt.Println("[?]")
fmt.Print("[?] Run whois", IP, "? (Y/N): ")
// Check if the user wants to run the whois command
var answer string
fmt.Scanln(&answer)
if strings.ToUpper(answer) == "Y" {
whoisCmd := exec.Command("whois", IP)
whoisOutput, err := whoisCmd.Output()
if err != nil {
log.Fatal("Error running whois command:", err)
}
fmt.Println(string(whoisOutput))
} else {
fmt.Println("[+] Goodbye!")
os.Exit(0)
}
}
Conclusion
By using Wireshark and analyzing STUN traffic on Telegram, we can discover the IP address of the user we are interacting with. This information can be useful for various purposes, such as checking the geographical location of the user or identifying potential network issues.
However, it is important to remember that user privacy should always be respected. The use of these techniques should be done ethically and within legal limits.
References:
https://medium.com/@ibederov_en/find-out-the-ip-address-through-a-call-to-telegram-a899441b1bac
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