Sigma rule: NET NGenAssemblyUsageLog Registry Key Tamper

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-f58dd734fdf1, updated 2023-08-17T00:00:00.000Z.

Rule

Title
NET NGenAssemblyUsageLog Registry Key Tamper
Status
test
Level
high
Author
frack113
Date
2022-11-18
Modified
2023-08-17
File
rules/windows/registry/registry_set/registry_set_net_cli_ngenassemblyusagelog.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects changes to the NGenAssemblyUsageLog registry key.
.NET Usage Log output location can be controlled by setting the NGenAssemblyUsageLog CLR configuration knob in the Registry or by configuring an environment variable (as described in the next section).
By simplify specifying an arbitrary value (e.g. fake output location or junk data) for the expected value, a Usage Log file for the .NET execution context will not be created.

Log source

product
windows
category
registry_set

Detection

selection:
    TargetObject|endswith: 'SOFTWARE\Microsoft\.NETFramework\NGenAssemblyUsageLog'
condition: selection

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.persistence
  • attack.defense-impairment
  • attack.t1112

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/registry/registry_set/registry_set_net_cli_ngenassemblyusagelog.yml

Sources and licences

  • SigmaHQ

    "NET NGenAssemblyUsageLog Registry Key Tamper" by frack113 (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/registry/registry_set/registry_set_net_cli_ngenassemblyusagelog.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: NET NGenAssemblyUsageLog Registry Key Tamper",
entity page, dataset version ref-f58dd734fdf1, updated 2023-08-17T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/28036918-04d3-423d-91c0-55ecf99fb892 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 28036918-04d3-423d-91c0-55ecf99fb892, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.