Analysis

  • max time kernel
    149s
  • max time network
    102s
  • 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

    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 (5361) 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:2364

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\$Recycle.Bin\S-1-5-21-330179853-1108322181-418488014-1000\desktop.ini.tmp

          Filesize

          19KB

          MD5

          b8317a827b672629d02da340aec2bcf0

          SHA1

          631830e682815df8c311ab70ef8783fe81e99f7b

          SHA256

          ac3662a35fe2ce0e38ce8b1c0133426c82d09ea464fcd16de4acc8f0ecc2d0fb

          SHA512

          c3eaef26a0601bb2777e697b929fa6f9ad43f464911137f482146b08acde868cc0101cb9a4981e4d36ecccc3f3b2b072a0fba71708785a8cc6742cde72929324

        • C:\b5678467481f56688dc2ce816954\2010_x86.log.html.tmp

          Filesize

          100KB

          MD5

          2896ca3de0909e34d804c60094d23922

          SHA1

          af26d84d2ac3f3cc7b2dece7d13628893edc5ce7

          SHA256

          de1949ff342b86fca1b1cde35436b938f177e16790b16cae2fcae8c1cd349f7f

          SHA512

          9052e33c95dfb24879af7e60ab5be31e017f82ccc70cbab861a9cc64334692066affafefb5e92007cb6fe0c8322f01fbb03a1bb74015375aaa9c220ece47f087

        • memory/2364-1225-0x0000000000400000-0x0000000000407000-memory.dmp

          Filesize

          28KB