Analysis

  • max time kernel
    148s
  • max time network
    128s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260709-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    10/09/2026, 01:23

General

  • Target
    2026-09-08_fc39c852646f4effab37e223a82a9c3a_elex_rhadamanthys_smoke-loader.exe
  • Size 284KB
  • Sample260910-br4qwstblg
  • SHA256 1d73505db1cff88251af742ee3245b1d23e792781daf27a7efb4efa768d7dcc3
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Signatures

  • Family: Cosmu

    Cosmu is a Windows worm written in C++.

  • Detects Cosmu payload 6 IoCs

    Cosmu is a worm written in C++.

  • Enumerates connected drives 3 TTPs 10 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • Sets desktop wallpaper using registry 2 TTPs 1 IoCs
  • Drops file in Program Files directory 64 IoCs
  • Drops file in Windows directory 2 IoCs
  • System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Modifies Internet Explorer settings 1 TTPs 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2026-09-08_fc39c852646f4effab37e223a82a9c3a_elex_rhadamanthys_smoke-loader.exe
    "C:\Users\Admin\AppData\Local\Temp\2026-09-08_fc39c852646f4effab37e223a82a9c3a_elex_rhadamanthys_smoke-loader.exe"
    1⤵
    • Enumerates connected drives
    • Sets desktop wallpaper using registry
    • Drops file in Program Files directory
    • Drops file in Windows directory
    • System Location Discovery: System Language Discovery
    • Modifies Internet Explorer settings
    PID:1132

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        7z.exe

        • Path C:\Program Files\7-Zip\7z.exe
        • Size 326KB
        • SHA256 dbb2ce0cef113867eee125b4fa307d99646504aa9a268774670bb2bf8941f86a
        • MD5 SHA1 SHA512 SSDEEP TLSH

        RCX8CA9.tmp

        • Path C:\Program Files\Google\Chrome\Application\RCX8CA9.tmp
        • Size 284KB
        • SHA256 025bdc3151ef1c1b108fba18f7bee334609a1ad9ce381aec56afe8cc535259a9
        • MD5 SHA1 SHA512 SSDEEP TLSH

        chrome.exe

        • Path C:\Program Files\Google\Chrome\Application\chrome.exe
        • Size 1.5MB
        • SHA256 e6164ebfa5115b8c9c8c549bebc65da9bda49c604cc99cccb50f87f1d1a0e7a3
        • MD5 SHA1 SHA512 SSDEEP TLSH

        RCX8DFC.tmp

        • Path C:\Program Files\Java\jdk-1.8\bin\RCX8DFC.tmp
        • Size 284KB
        • SHA256 f7707e7a4d2ae3f3fd9dbf4073c023dfa85fe786f67b125ee285f28f4b699503
        • MD5 SHA1 SHA512 SSDEEP TLSH

        helper.exe

        • Path C:\Program Files\Mozilla Firefox\uninstall\helper.exe
        • Size 326KB
        • SHA256 2bb2b53e375d0c8db184fb31e8ba48e88e773e13ea79a592682d9e006a0bb5e8
        • MD5 SHA1 SHA512 SSDEEP TLSH

        createdump.exe

        • Path C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\createdump.exe
        • Size 284KB
        • SHA256 202f37115a49c1b62b8a7ef913d00d25c03ba63df99ada1881927ad22ab3ec8c
        • MD5 SHA1 SHA512 SSDEEP TLSH