Rhadamanthys Stealer Module Launch Via Rundll32.EXE

title: Rhadamanthys Stealer Module Launch Via Rundll32.EXE
id: 5cdbc2e8-86dd-43df-9a1a-200d4745fba5
status: test
description: Detects the use of Rundll32 to launch an NSIS module that serves as the main stealer capability of Rhadamanthys infostealer, as observed in reports and samples in early 2023
references:
    - https://elis531989.medium.com/dancing-with-shellcodes-analyzing-rhadamanthys-stealer-3c4986966a88
    - https://blog.cyble.com/2023/01/12/rhadamanthys-new-stealer-spreading-through-google-ads/
    - https://www.joesandbox.com/analysis/790122/0/html
    - https://twitter.com/anfam17/status/1607477672057208835
author: TropChaud
date: 2023-01-26
modified: 2023-02-05
tags:
    - attack.stealth
    - attack.t1218.011
    - detection.emerging-threats
logsource:
    category: process_creation
    product: windows
detection:
    selection_rundll32:
        - OriginalFileName: 'RUNDLL32.EXE'
        - Image|endswith: '\rundll32.exe'
    selection_dll:
        CommandLine|contains: 'nsis_uns'
    selection_export_function:
        CommandLine|contains: 'PrintUIEntry'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium