Potential In-Memory Execution Using Reflection.Assembly

 1title: Potential In-Memory Execution Using Reflection.Assembly
 2id: ddcd88cb-7f62-4ce5-86f9-1704190feb0a
 3status: test
 4description: Detects usage of "Reflection.Assembly" load functions to dynamically load assemblies in memory
 5references:
 6    - https://speakerdeck.com/heirhabarov/hunting-for-powershell-abuse?slide=50
 7author: frack113
 8date: 2022-12-25
 9modified: 2026-10-19
10tags:
11    - attack.stealth
12    - attack.t1620
13logsource:
14    product: windows
15    category: ps_script
16    definition: Script Block Logging must be enable
17detection:
18    selection:
19        ScriptBlockText|contains: '[Reflection.Assembly]::load'
20    filter_optional_sqlserver:
21        Path|startswith:
22            - 'C:\Program Files (x86)\Microsoft SQL Server\'
23            - 'C:\Program Files\Microsoft SQL Server\'
24        Path|endswith: '\Tools\PowerShell\Modules\SQLPS\SqlPsPostScript.ps1'
25        ScriptBlockText|contains: 'SQLSERVER: { Set-Location'
26    condition: selection and not 1 of filter_optional_*
27falsepositives:
28    - Legitimate use of the library
29level: medium
30regression_tests_path: regression_data/rules/windows/powershell/powershell_script/posh_ps_dotnet_assembly_from_file/info.yml