How Hackers Intercept Your Phone Calls and Messages

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Basic methods of intercepting phone calls and messages​

1. SS7 attacks​

SS7 (Signaling System No. 7) is an international protocol used by telecommunications companies to ensure the operation of telephone networks. It is responsible for routing calls and messages between operators.
Hackers can exploit vulnerabilities in the SS7 protocol to intercept calls and messages. These attacks typically require access to the carrier's equipment or penetration of its networks. By exploiting SS7 vulnerabilities, attackers can redirect calls and SMS to their devices, eavesdrop on conversations, or intercept authentication codes sent via SMS.

2. IMSI-catchers​

IMSI-catchers (International Mobile Subscriber Identity-catchers), also known as "traps" or "fake cell towers," are devices that disguise themselves as legitimate cell towers and trick phones into connecting to them. Once connected, the attacker can intercept calls and messages, as well as track the location of the device.

IMSI catchers can be used to:

• Interception and wiring of calls.
• Reading SMS messages.
• Sending fake messages.
• Determining the user's location.

3. Phishing and social engineering​

Phishing and social engineering are methods by which hackers trick users into revealing sensitive information. For example, attackers may send fake messages or emails that look like they are from legitimate organizations, asking for login information or other personal data.
Once this data is obtained, hackers can:

• Access to accounts and interception of messages.
• Listening to and recording telephone conversations.
• Sending messages on behalf of the victim.

4. Malware​

Hackers can use malware to gain access to a victim's phone. This software can be installed on the device through phishing attacks, infected apps, or by exploiting vulnerabilities in the device's operating system.
Malware can:

• Listen to calls.
• Read and send SMS messages.
• Access contacts and other personal information.

5. Attacks on messengers​

Modern messengers such as WhatsApp, Telegram, Signal and others use encryption to protect messages. However, hackers can find ways to bypass this protection using:

• Exploits and vulnerabilities in the applications themselves.
• Data interception with insufficient encryption level.
• Phishing and social engineering to obtain login details.

6. Spyware​

Spyware is malware that is installed on the victim's phone to intercept calls and messages. Here's how it works:

• A user can accidentally install spyware by downloading an infected application or opening a malicious email attachment.
• Once the spyware is installed, the hacker gains access to calls, messages and other data on the device.
• Some spyware can even activate the phone's microphone and camera without the user's knowledge.

7. Vulnerabilities in Messaging Apps​

Many people use messaging apps like WhatsApp, Telegram, and others. These apps may also be vulnerable to attacks:

• Software vulnerabilities could allow hackers to access messages.
• Using unencrypted or weakly encrypted connections increases the risk of data interception.
• Some hackers use social engineering techniques to gain access to user accounts in such applications.

How to protect yourself from interception of phone calls and messages​

1. Using encryption​

Encryption is one of the most effective ways to protect your data. Use apps that provide end-to-end encryption for calls and messages, such as Signal or WhatsApp.

2. Software update​

Keep your phone's operating system and apps updated regularly to minimize the risk of vulnerabilities being exploited by hackers.

3. Using antivirus software​

Install reliable antivirus software that can detect and remove spyware from your device.

4. Be careful when installing applications​

Be careful when installing apps and opening email attachments. Only download apps from official sources and avoid suspicious links.

5. Monitoring activity​

Be aware of any unusual behavior on your phone, such as rapid battery drain, overheating, or unexpected data usage, which may indicate the presence of spyware.

Interception of telephone calls and messages is a serious threat that can lead to leakage of confidential information and other negative consequences. Hackers use various methods to achieve their goals, including IMSI Catchers, attacks on SS7 protocols, spyware, and vulnerabilities in messaging applications.