Analysis

  • max time kernel
    150s
  • max time network
    103s
  • platform
    windows11-21h2_x64
  • resource
    win11-20250502-en
  • resource tags

    arch:x64arch:x86image:win11-20250502-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    05/06/2025, 08:14

General

  • Target

    b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe

  • Size

    26KB

  • MD5

    fa24406f7dced91a8d217b89fcf5edcf

  • SHA1

    3acbdd164372f9844b92346603c64f970c8079fa

  • SHA256

    b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa

  • SHA512

    5b9fd0b3dd6678f5e8661ebf0fbde70effd7f6bd62ee4c03d8bf7c0241786ae4908deebc5f5d8ddb0513c4bc539ecdec6fdf92f3988c273d6eab31bb44d603b9

  • SSDEEP

    384:gBt7Br5xjL9AgA71FbhvP/KWLsqmFae+rOAqmFae+rOb8p8dWA8dWK:s7BlpppARFbhdLz8ae+rOn8ae+rOb8N

Malware Config

Signatures

  • Cosmu

    Cosmu is a Windows worm written in C++.

  • Cosmu family
  • Detects Cosmu payload 2 IoCs

    Cosmu is a worm written in C++.

  • Renames multiple (5366) files with added filename extension

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

  • Drops file in Program Files directory 64 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.

Processes

  • C:\Users\Admin\AppData\Local\Temp\b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe
    "C:\Users\Admin\AppData\Local\Temp\b915e7033b022809456a0832d0e2bdffbe3eba14e36771092aba299f650515aa.exe"
    1⤵
    • Drops file in Program Files directory
    • System Location Discovery: System Language Discovery
    PID:5896

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\$Recycle.Bin\S-1-5-21-779059454-4269757009-3780780039-1000\desktop.ini.tmp

          Filesize

          26KB

          MD5

          a2eca795d6fcd3f792040732b373c07c

          SHA1

          46401b9e269337da3dffc53b5b8a699d49ae463f

          SHA256

          e2d70dd5cfbf0ed143420d3f934a331d74268aa17f6ec809f8589d5ad7236387

          SHA512

          24bb5bb08adb8c8aeb2a91a0a3c32131c550f9badb884a1ad21bcad854126d72402ccac488d5530d48ceab0da91ac8910d6d76a2b0ad13e05a5eaf5555c739b3

        • C:\e62b36dd3cccbd0b2c8aefa1fa8db0\2010_x86.log.html.tmp

          Filesize

          108KB

          MD5

          450d448575c1c01aba12cffb8e13f7fb

          SHA1

          8096ca61e4d377517b917a9816aa3743db3f6e0f

          SHA256

          d734cf4cd0dc7033119a15aa781b608b891fe7412c2c1ad4117c3c450f0046cc

          SHA512

          8ed06d91c8f2fcae2a5f39ec97901f9da4e1df92c3015a230a483544514119ad3baaddfdb8500b8eb374018b01afb157d92b50fadd3e5713ccaaf96a32c935d1