NET NGenAssemblyUsageLog Registry Key Tamper
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.
Sigma rule (View on GitHub)
1title: NET NGenAssemblyUsageLog Registry Key Tamper
2id: 28036918-04d3-423d-91c0-55ecf99fb892
3status: test
4description: |
5 Detects changes to the NGenAssemblyUsageLog registry key.
6 .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).
7 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.
8references:
9 - https://bohops.com/2021/03/16/investigating-net-clr-usage-log-tampering-techniques-for-edr-evasion/
10author: frack113
11date: 2022-11-18
12modified: 2023-08-17
13tags:
14 - attack.defense-evasion
15 - attack.t1112
16logsource:
17 product: windows
18 category: registry_set
19detection:
20 selection:
21 TargetObject|endswith: 'SOFTWARE\Microsoft\.NETFramework\NGenAssemblyUsageLog'
22 condition: selection
23falsepositives:
24 - Unknown
25level: high
References
-
Introduction In recent years, there have been numerous published techniques for evading endpoint security solutions and sources such as A/V, EDR and logging facilities. The methods deployed to achi…
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