📖 Overview
A suspicious URL hosted on Microsoft’s DevTunnel service has been identified distributing a Windows Portable Debug (PDB) file linked to the XWorm malware family. Abuse of developer and cloud environments for malware distribution is an increasingly common tactic to bypass trust-based defenses. Confidence is assessed at 100%.
📌 Key Details
| Field | Information |
|---|---|
| Type | URL |
| Indicator | https://05q0h4x0-5500.euw.devtunnels.ms/1.pdb |
| Threat Type | Payload Delivery |
| Malware | win.xworm |
| Confidence | 100% |
| Date | 08 Oct 2025 – 16:15:41 UTC |
| Tags | None |
| Reporter | burger |
| Reference | None |
🔎 URLScan Result
- Verdict Score: 0
- Page Title: No Title
- Screenshot: View Screenshot
- Result: Full Scan Report
📡 Related Intelligence
- VirusTotal Report: VirusTotal URL Report
🛡️ Defensive Guidance
- Block access to 05q0h4x0-5500.euw.devtunnels.ms at DNS and proxy layers.
- Monitor for attempted downloads of .pdb files from unfamiliar or suspicious domains.
- Hunt for XWorm artifacts, including persistence mechanisms, registry modifications, and beaconing traffic.
- Consider restricting developer tunnel usage in enterprise environments unless explicitly required.
⚠️ This IOC underscores how attackers are abusing developer-oriented services like Microsoft DevTunnels to deliver malicious payloads under the guise of trusted infrastructure.
