Library / Windows
nltest.exe
Microsoft® Logon Server Test Utility · Microsoft Corporation
OriginalFilename
nltestrk.exenltest.exe
Value changed across builds
Gotchas
Every build from Windows 10 1507 through Windows 11 25H2 reports nltestrk.exe. Windows 11 26H1 switched to nltest.exe, so a rule that only lists nltestrk.exe (the long-standing Sigma value) misses 26H1.
- OriginalFilename changed across builds:
nltestrk.exe(x64, x86; Win10 1507 → Win11 25H2);nltest.exe(x64, x86; Win11 26H1). Match every value.
Query snippets
logsource:
category: process_creation
product: windows
detection:
selection:
- Image|endswith: '\nltest.exe'
- OriginalFileName:
- 'nltestrk.exe'
- 'nltest.exe'
condition: selectionprocess_creation logsource. Sigma string matching is case-insensitive.
| tstats summariesonly=false count values(Processes.original_file_name) as original_file_name
from datamodel=Endpoint.Processes
where (Processes.original_file_name="nltestrk.exe" OR Processes.original_file_name="nltest.exe" OR Processes.process_name="nltest.exe")
by Processes.dest Processes.process_name Processes.process_path Processes.process
| rename Processes.* as *Endpoint.Processes data model. On raw Sysmon events the field is OriginalFileName.
DeviceProcessEvents
| where ProcessVersionInfoOriginalFileName in~ ("nltestrk.exe", "nltest.exe")
or FileName =~ "nltest.exe"Microsoft Defender XDR advanced hunting. in~ and =~ are case-insensitive.
process where event.type == "start" and
(process.pe.original_file_name in~ ("nltestrk.exe", "nltest.exe") or
process.name : "nltest.exe")ECS process.pe.original_file_name is a keyword field: in~ is case-insensitive, Kibana KQL is not.
['nltestrk.exe', 'nltest.exe'].includes(String(OriginalFileName || '').toLowerCase())Filter expression (JavaScript) for events carrying Sysmon's OriginalFileName field.
Values across builds
| OriginalFilename | Builds | Arch | File version | Windows releases | Source | Sysmon |
|---|---|---|---|---|---|---|
| nltestrk.exe | 21 | x64, x86 | 10.0.10240.20883 → 10.0.26100.9549 | Win10 1507 → Win11 25H2 (13) | Host scan, Winbindex | ✓ 1 |
| nltest.exe | 2 | x64, x86 | 10.0.28000.3086 | Win11 26H1 | Winbindex |
All 23 parsed builds · 8 Windows release groups not verifiable
| SHA256 | Version | Arch | OriginalFilename | Windows releases | Signature | Source | Sysmon |
|---|---|---|---|---|---|---|---|
| a4388933eb3c… | 10.0.28000.3086 | x86 | nltest.exe | Win11 26H1 | Winbindex | ||
| 40b85820acf5… | 10.0.28000.3086 | x64 | nltest.exe | Win11 26H1 | Unsigned | Winbindex | |
| fd22416cff9c… | 10.0.26100.9549 | x64 | nltestrk.exe | Win11 24H2 | Unsigned | Host scan, Winbindex | ✓ |
| 76e8d6cb45a0… | 10.0.14393.9507 | x86 | nltestrk.exe | Win10 1607 | Unsigned | Winbindex | |
| 143e44f8e4b1… | 10.0.14393.9507 | x64 | nltestrk.exe | Win10 1607 | Unsigned | Winbindex | |
| 7c771706baff… | 10.0.17763.6292 | x86 | nltestrk.exe | Win10 1809 | Unsigned | Winbindex | |
| 581501aae7f6… | 10.0.17763.6292 | x64 | nltestrk.exe | Win10 1809 | Unsigned | Winbindex | |
| 4e6d84a7d1cf… | 10.0.26100.7309 | x86 | nltestrk.exe | Win11 24H2 | Unsigned | Winbindex | |
| 1eac975bc160… | 10.0.26100.5074 | x64 | nltestrk.exe | Win11 24H2, Win11 25H2 | Unsigned | Winbindex | |
| f2ea90294df6… | 10.0.10240.20883 | x64 | nltestrk.exe | Win10 1507 | Unsigned | Winbindex | |
| 05f1aaeffee3… | 10.0.22000.2777 | x64 | nltestrk.exe | Win11 21H2 | Unsigned | Winbindex | |
| 50f1e1407f11… | 10.0.18362.2158 | x64 | nltestrk.exe | Win10 1909 | Unsigned | Winbindex | |
| 5e733dda5ee4… | 10.0.19041.1320 | x86 | nltestrk.exe | Win10 2004 | Winbindex | ||
| 214215c05ca7… | 10.0.19041.1320 | x64 | nltestrk.exe | Win10 2004 | Unsigned | Winbindex | |
| 7f4e7b468c6d… | 10.0.18362.1645 | x86 | nltestrk.exe | Win10 1909 | Winbindex | ||
| 734efd5367e2… | 10.0.17134.1038 | x64 | nltestrk.exe | Win10 1803 | Unsigned | Winbindex | |
| 2c374b684507… | 10.0.15063.2161 | x64 | nltestrk.exe | Win10 1703 | Unsigned | Winbindex | |
| e2c3e91f1ff8… | 10.0.18362.1110 | x64 | nltestrk.exe | Win10 1903 | Unsigned | Winbindex | |
| 1f97fca83dc2… | 10.0.18362.1110 | x86 | nltestrk.exe | Win10 1903 | Unsigned | Winbindex | |
| 7c67af38c6e6… | 10.0.16299.1480 | x64 | nltestrk.exe | Win10 1709 | Unsigned | Winbindex | |
| 0c5c48400271… | 10.0.17134.1038 | x86 | nltestrk.exe | Win10 1803 | Unsigned | Winbindex | |
| ce0e798a417c… | 10.0.10586.1106 | x64 | nltestrk.exe | Win10 1511 | Unsigned | Winbindex | |
| 9a40f53c666d… | 10.0.10586.1106 | x86 | nltestrk.exe | Win10 1511 | Unsigned | Winbindex |
Winbindex builds link to the Microsoft symbol server copy that was hashed and parsed.