Analysis

  • max time kernel
    150s
  • max time network
    136s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20250502-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20250502-enlocale:en-usos:windows10-2004-x64system
  • submitted
    05/06/2025, 08:14

General

  • Target

    a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe

  • Size

    19KB

  • MD5

    e348051170938c799b6303a8141c9299

  • SHA1

    eb602bf4bf72e15aed85b31af03e2f0840c69e82

  • SHA256

    a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7

  • SHA512

    4537f920f6adc2b680b6d298ae6bca4db9d9bb8615e0b65ed63c6c1a4453d560d28bc6294b63d4b2862431d167a5ca6f0b6c27ae42d0f430c275e84b785c0fdd

  • SSDEEP

    384:hAg+5OCZ4W6/KWLsqmFae+rOAqmFae+rOiOZ2OZofTlCGrlCGT:uZ4FLz8ae+rOn8ae+rOkkGUGT

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 (5278) 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\a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe
    "C:\Users\Admin\AppData\Local\Temp\a640baf1ea4f1fc120e9ba9c8d714762d42c01bac7d3587f53b66e7e64d22bc7.exe"
    1⤵
    • Drops file in Program Files directory
    • System Location Discovery: System Language Discovery
    PID:1724

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\$Recycle.Bin\S-1-5-21-1153236273-2212388449-1493869963-1000\desktop.ini.tmp

          Filesize

          19KB

          MD5

          d107825fbf1585c7d9035d8ded0a54da

          SHA1

          1233fe1585ef946a81167a4cfacf10192ee60cf2

          SHA256

          2ab7da751af72c9a3cbd875c4c4ad4cfb241e6958d16791bc15ea29b6547bf8b

          SHA512

          31a0a363c5ac7eefe4532abd963d8cdb92f8b0317f4e67494e42fb93d701909444094eaab1f36f868eff2482445f0d6beb33d28fa553e79256ef0f9d26e24e20

        • C:\f518c2ae32873fab6fcffcc19027\2010_x64.log.html.tmp

          Filesize

          105KB

          MD5

          b6697105c2f8430174afd25dcdd78065

          SHA1

          2543a008d6e8f9c7e11ce9bcb88507c296c92b2d

          SHA256

          8cee86eb34cdba12075384afe91be9caa47270096e43e692977ed605d18b7d5d

          SHA512

          11de5b781b25efe9734f90aed8201100280abcd49028474496f74e0d68886fe2173ef0e3112d6d6f9beed2c8c3b89ce18bdb79d3dd85522114aeaad768039737

        • memory/1724-811-0x0000000000400000-0x0000000000407000-memory.dmp

          Filesize

          28KB