Nt5src7z Hot Guide
If you know which program spawns nt5src7z, you can often replace it:
The string nt5src7z hot appears to be a shorthand or command fragment from a Windows NT 5 (Windows 2000/XP) source code or debugging environment. It breaks down into:
This write-up describes the process of handling a password-protected or time-sensitive source code archive labeled nt5src.7z with the password hot. nt5src7z hot
| Feature | Legitimate Version | Malware Impersonation |
| :--- | :--- | :--- |
| File Location | C:\Program Files\Common Files\ or C:\Users\[YourName]\AppData\Local\Temp\ | C:\Windows\System32\ or C:\Windows\Temp\ |
| Digital Signature | Often unsigned or signed by a small modding team | No signature or fake Microsoft signature |
| Parent Process | Launched by a game launcher (Steam, Epic) or 7-Zip | Launched by svchost.exe (unusual) or powershell.exe (headless) |
| Behavior | High CPU only while gaming/modding | Constant high CPU, network connections, registry changes |
| Type | Example |
|------|---------|
| File | C:\Windows\System32\drivers\nt5src7z_hotpatch.sys (hash: d4e8a9b3c7f2e1a9c5b6d7e8f9a0b1c2) |
| Registry | HKLM\SYSTEM\CurrentControlSet\Services\nt5src7z – ImagePath points to the hot‑patch driver. |
| Event Log | Event ID 1001 (Driver Load Failure) followed by Event ID 7045 (Service installed). |
| Network | Outbound connections from the compromised device to *.malicious‑cdn.net on ports 80/443 within 30 seconds of a backup job. |
| Memory | Presence of the pattern \x90\x90\x90\xEB\x??\x90\x90\x90\x90 in the kernel’s non‑paged pool (common NOP‑sled used in the PoC). | If you know which program spawns nt5src7z ,
After extraction, grep for hot within the source to confirm context:
grep -r "hot" nt5src/private/ntos/ | head -20
Common findings:
The hot‑patch module (nt5src7z_hotpatch.sys) was released by a third‑party OEM to fix an unrelated bug in Nt5Src7z_Decompress. Unfortunately, the patch re‑implemented the function but re‑used the same buggy allocation pattern and also exposed a new IOCTL (IOCTL_NT5SRC7Z_DECOMPRESS) that allowed unprivileged callers to pass arbitrary archive data to the routine.
Attack flow:
Because the hot‑patch module is loaded system‑wide, any process (including limited users) can trigger the bug, turning a local privilege escalation into a remote attack surface when a network service forwards user data to the device driver (e.g., a web‑based backup portal).
