Library / Windows

nltest.exe

Microsoft® Logon Server Test Utility · Microsoft Corporation

WindowsSysmon-confirmedSigma refs: 6

OriginalFilename

  • nltestrk.exe
  • nltest.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: selection

process_creation logsource. Sigma string matching is case-insensitive.

Values across builds

OriginalFilenameBuildsArchFile versionWindows releasesSourceSysmon
nltestrk.exe21x64, x8610.0.10240.20883 → 10.0.26100.9549Win10 1507 → Win11 25H2 (13)Host scan, Winbindex✓ 1
nltest.exe2x64, x8610.0.28000.3086Win11 26H1Winbindex

InternalName: nltest.exe, nltestrk.exe · Product: Microsoft® Windows® Operating System

All 23 parsed builds · 8 Windows release groups not verifiable
SHA256VersionArchOriginalFilenameWindows releasesSignatureSourceSysmon
a4388933eb3c…10.0.28000.3086x86nltest.exeWin11 26H1Winbindex
40b85820acf5…10.0.28000.3086x64nltest.exeWin11 26H1UnsignedWinbindex
fd22416cff9c…10.0.26100.9549x64nltestrk.exeWin11 24H2UnsignedHost scan, Winbindex✓
76e8d6cb45a0…10.0.14393.9507x86nltestrk.exeWin10 1607UnsignedWinbindex
143e44f8e4b1…10.0.14393.9507x64nltestrk.exeWin10 1607UnsignedWinbindex
7c771706baff…10.0.17763.6292x86nltestrk.exeWin10 1809UnsignedWinbindex
581501aae7f6…10.0.17763.6292x64nltestrk.exeWin10 1809UnsignedWinbindex
4e6d84a7d1cf…10.0.26100.7309x86nltestrk.exeWin11 24H2UnsignedWinbindex
1eac975bc160…10.0.26100.5074x64nltestrk.exeWin11 24H2, Win11 25H2UnsignedWinbindex
f2ea90294df6…10.0.10240.20883x64nltestrk.exeWin10 1507UnsignedWinbindex
05f1aaeffee3…10.0.22000.2777x64nltestrk.exeWin11 21H2UnsignedWinbindex
50f1e1407f11…10.0.18362.2158x64nltestrk.exeWin10 1909UnsignedWinbindex
5e733dda5ee4…10.0.19041.1320x86nltestrk.exeWin10 2004Winbindex
214215c05ca7…10.0.19041.1320x64nltestrk.exeWin10 2004UnsignedWinbindex
7f4e7b468c6d…10.0.18362.1645x86nltestrk.exeWin10 1909Winbindex
734efd5367e2…10.0.17134.1038x64nltestrk.exeWin10 1803UnsignedWinbindex
2c374b684507…10.0.15063.2161x64nltestrk.exeWin10 1703UnsignedWinbindex
e2c3e91f1ff8…10.0.18362.1110x64nltestrk.exeWin10 1903UnsignedWinbindex
1f97fca83dc2…10.0.18362.1110x86nltestrk.exeWin10 1903UnsignedWinbindex
7c67af38c6e6…10.0.16299.1480x64nltestrk.exeWin10 1709UnsignedWinbindex
0c5c48400271…10.0.17134.1038x86nltestrk.exeWin10 1803UnsignedWinbindex
ce0e798a417c…10.0.10586.1106x64nltestrk.exeWin10 1511UnsignedWinbindex
9a40f53c666d…10.0.10586.1106x86nltestrk.exeWin10 1511UnsignedWinbindex

Winbindex builds link to the Microsoft symbol server copy that was hashed and parsed.