Analysis

  • max time kernel
    150s
  • max time network
    127s
  • platform
    windows11-21h2_x64
  • resource
    win11-20250502-en
  • resource tags

    arch:x64arch:x86image:win11-20250502-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    29/05/2025, 10:04

General

  • Target

    31636d98b7165702e3bc2cd27ade00eddfc05edb4a7d4a5cc53c13da6ed0658a.exe

  • Size

    28KB

  • MD5

    99bb589848df9617aad19c224ab538b7

  • SHA1

    cc28b66727df82f2297e158012f94b8b18cdc360

  • SHA256

    31636d98b7165702e3bc2cd27ade00eddfc05edb4a7d4a5cc53c13da6ed0658a

  • SHA512

    cb025f43ed25b5209f125668dc443af56b72b6454f6d2b1dcac4947bd3c9d83ebf73e4bb7b147f149b5b64065470f69d5e53b936ccfa6e6c554eb9dca5c33fe6

  • SSDEEP

    768:uZ4FLz8ae+rOn8ae+rOHPRPq+BSBmBCUK9+BSBmBCUK1:uGIIHp1MkPMkU

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 (5343) 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\31636d98b7165702e3bc2cd27ade00eddfc05edb4a7d4a5cc53c13da6ed0658a.exe
    "C:\Users\Admin\AppData\Local\Temp\31636d98b7165702e3bc2cd27ade00eddfc05edb4a7d4a5cc53c13da6ed0658a.exe"
    1⤵
    • Drops file in Program Files directory
    • System Location Discovery: System Language Discovery
    PID:4200

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\$Recycle.Bin\S-1-5-21-3588213599-686740421-4058676312-1000\desktop.ini.tmp

          Filesize

          28KB

          MD5

          12251d81d1e693fbc92ab8115e9e290e

          SHA1

          aef3fd13f5dc9341af9e7184c14e8340e7dbf087

          SHA256

          8c2267ae648723d197f32d105af98248ec9fa59129ba1cae5b89c6a922581a04

          SHA512

          10989eaea6278225c9cd476e6ec71d5d2068df8c14d0a6360d7723150a15f5a6de4d823432b4bcd0dee3b96940754efc7c4840fc6d7432226828b8cb5bb155ff

        • C:\ef2ee615ae93a516ddfc423cbf0f901a\2010_x86.log.html.tmp

          Filesize

          109KB

          MD5

          a042904fecfc0b0f19be26bd6981e0aa

          SHA1

          8d8c52209581be6d1cf610aaacaf582da59e924d

          SHA256

          86ecfe81226e4a57f877c2d34476492a8d385ae694c98144eeb8e4f4ea10e02e

          SHA512

          eb8784ab6ae98c6487b5771d3c7210a04eafc67ce0e10d1ccb688099c0ae39aa71fa25fbb6be9d3eddb035400cae4c7f0571dc4b7cae2da02f61bd517c091a64

        • memory/4200-1123-0x0000000000400000-0x0000000000407000-memory.dmp

          Filesize

          28KB