Sigma rule: Potential In-Memory Execution Using Reflection.Assembly

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-8877ea8bb6fe, updated 2026-10-19T00:00:00.000Z.

Rule

Title
Potential In-Memory Execution Using Reflection.Assembly
Status
test
Level
medium
Author
frack113
Date
2022-12-25
Modified
2026-10-19
File
rules/windows/powershell/powershell_script/posh_ps_dotnet_assembly_from_file.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects usage of "Reflection.Assembly" load functions to dynamically load assemblies in memory

Log source

product
windows
category
ps_script
definition
Script Block Logging must be enable

Detection

selection:
    ScriptBlockText|contains: '[Reflection.Assembly]::load'
filter_optional_sqlserver:
    Path|startswith:
        - 'C:\Program Files (x86)\Microsoft SQL Server\'
        - 'C:\Program Files\Microsoft SQL Server\'
    Path|endswith: '\Tools\PowerShell\Modules\SQLPS\SqlPsPostScript.ps1'
    ScriptBlockText|contains: 'SQLSERVER: { Set-Location'
condition: selection and not 1 of filter_optional_*

False positives (as the rule lists them)

  • Legitimate use of the library

Tags

  • attack.stealth
  • attack.t1620

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/powershell/powershell_script/posh_ps_dotnet_assembly_from_file.yml

Sources and licences

  • SigmaHQ

    "Potential In-Memory Execution Using Reflection.Assembly" by frack113 (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/powershell/powershell_script/posh_ps_dotnet_assembly_from_file.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: Potential In-Memory Execution Using Reflection.Assembly",
entity page, dataset version ref-8877ea8bb6fe, updated 2026-10-19T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/ddcd88cb-7f62-4ce5-86f9-1704190feb0a (accessed 2026-11-03).
Underlying source: SigmaHQ rule ddcd88cb-7f62-4ce5-86f9-1704190feb0a, 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.