Analysis

  • max time kernel
    150s
  • max time network
    137s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20250502-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20250502-enlocale:en-usos:windows10-2004-x64system
  • submitted
    29/05/2025, 11:56

General

  • Target

    c866485f17cf458dd576fd1793616d2e517fab50831a146a9c92abd79101dd7a.exe

  • Size

    81KB

  • MD5

    a7eb60af984e9ad21bc2758907738663

  • SHA1

    e6b2d82662b82a58457641710f00a76a28ad676d

  • SHA256

    c866485f17cf458dd576fd1793616d2e517fab50831a146a9c92abd79101dd7a

  • SHA512

    121e9fe269fc368e3b2ee8968d2606505a18b9be9faec17adcdc39f3c45ec35fefafd3f91b785cb088fcf1df89fbaef18c5bd34a9f1849e6bf8c902f6defcc9e

  • SSDEEP

    1536:uGIIHp1MkPMkTgZgaX+I8K/XCKCGSqzVi:3gZgU+ufC58A

Malware Config

Signatures

  • Cosmu

    Cosmu is a Windows worm written in C++.

  • Cosmu family
  • Detects Cosmu payload 1 IoCs

    Cosmu is a worm written in C++.

  • Renames multiple (5273) files with added filename extension

    This suggests ransomware activity of encrypting all the files on the system.

  • Executes dropped EXE 2 IoCs
  • Drops file in System32 directory 2 IoCs
  • Drops file in Program Files directory 64 IoCs
  • System Location Discovery: System Language Discovery 1 TTPs 2 IoCs

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

  • Suspicious use of WriteProcessMemory 5 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\c866485f17cf458dd576fd1793616d2e517fab50831a146a9c92abd79101dd7a.exe
    "C:\Users\Admin\AppData\Local\Temp\c866485f17cf458dd576fd1793616d2e517fab50831a146a9c92abd79101dd7a.exe"
    1⤵
    • Drops file in System32 directory
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4868
    • C:\Users\Admin\AppData\Local\Temp\_createdump.exe
      "_createdump.exe"
      2⤵
      • Executes dropped EXE
      PID:3088
    • C:\Windows\SysWOW64\Zombie.exe
      "C:\Windows\system32\Zombie.exe"
      2⤵
      • Executes dropped EXE
      • Drops file in Program Files directory
      • System Location Discovery: System Language Discovery
      PID:3680

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\$Recycle.Bin\S-1-5-21-3674642747-2260306818-3009887879-1000\desktop.ini.exe

          Filesize

          25KB

          MD5

          3c3fdcaf5b86bec4bb2670ff32a7ee1d

          SHA1

          0f72d256a5c28767f88c11f9cc59fa1326e5dd66

          SHA256

          bf27f74b0bf6baa60cbbeac2f59af92fa94b04ea9308975d4f0445a74c366449

          SHA512

          8a700829d272f4cb05f537e58afb5c4265d70109118f708cdebbe3b8c3ce15f7a3938cd1f9d87e9857afe2a0d06889f5d22add5a28f8b67ca944e6aa29a601df

        • C:\Users\Admin\AppData\Local\Temp\_createdump.exe

          Filesize

          56KB

          MD5

          a05b36f6129223951282f9df776761b1

          SHA1

          ec87fa41a670cffa5d77f64366fe109278661f2c

          SHA256

          5113e7ae92f3a7aebc7f8e363209866d4d743b06a26c67e0886979a56fd3a10d

          SHA512

          38b588b28057994305a3abc37d98770ab7ff905cba6da35e91b2936b99823955fc91b90a23174d53337dd62e320b9bac066b76734bf657de9fad6d37071c70da

        • C:\Windows\SysWOW64\Zombie.exe

          Filesize

          25KB

          MD5

          fcd15511ba50c6c59efef7a352352329

          SHA1

          ef1c38322fb9bdc6ba5f2e10ac2bfc7844ecc8a4

          SHA256

          0d14960e6b013659736bf98f6554b0d0a4891031a92dc8246233f427f64767b6

          SHA512

          11cdb9f20f065494989ee91b19122d42a57a0fdd9e145e637418eb75e889fde809f7adb6e760481d2c7560548f09f0f11931d42aca034f424842a260fe08e1e9

        • memory/4868-23-0x0000000000400000-0x0000000000407000-memory.dmp

          Filesize

          28KB