Analysis

  • max time kernel
    150s
  • max time network
    145s
  • 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

    8a6bfb209fd6d7f9544561a2c6e6c7eebf7c5fdd69ccd61016d510337abeb87f.exe

  • Size

    35KB

  • MD5

    87a571e238591e85d55f4d90eee348db

  • SHA1

    360f3d92c9b45fa70e37793d43f13b2a73d12d10

  • SHA256

    8a6bfb209fd6d7f9544561a2c6e6c7eebf7c5fdd69ccd61016d510337abeb87f

  • SHA512

    51ba61db687669d65722a4e808cdad4dd003565770bb50f5c266abdae9e798c1640bb6068df55d89a3f796fbac60f9bdd5650bbab6d7784c124a1220d445560d

  • SSDEEP

    384:hAg+5OCZ4W6/KWLsqmFae+rOAqmFae+rOfijcijK2J7u82J7uFBlB0:uZ4FLz8ae+rOn8ae+rOfXqJ7gJ7ITe

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 (5207) 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\8a6bfb209fd6d7f9544561a2c6e6c7eebf7c5fdd69ccd61016d510337abeb87f.exe
    "C:\Users\Admin\AppData\Local\Temp\8a6bfb209fd6d7f9544561a2c6e6c7eebf7c5fdd69ccd61016d510337abeb87f.exe"
    1⤵
    • Drops file in Program Files directory
    • System Location Discovery: System Language Discovery
    PID:1596

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\$Recycle.Bin\S-1-5-21-3342576763-1998465526-3870295501-1000\desktop.ini.tmp

          Filesize

          36KB

          MD5

          898489f84a8a186209888f6004475002

          SHA1

          0119ee430ad48d6dc468ebbfabd1d1c8306192aa

          SHA256

          9d2ef967a594f8ec4fd04fdee0ab444d7ee1da1b39b8cb416f78f8a24eb78303

          SHA512

          f6556df7a1ebc2d1039acba64f629f19145d48ace4c5d54ffe1d24b68ecdce33865bed017a481ff58b043cbac7f3c2c1c2c201d632c179065812d5f55a57b1a4

        • C:\fa79de221d524b769d0447\2010_x64.log.html.tmp

          Filesize

          121KB

          MD5

          9d31f6f7cbeb2f0716cf0440938ded12

          SHA1

          7d41764c24f9ce49934712beb0650991d38ba82d

          SHA256

          282dc2a4c7bb1043ac876d2da660383d7e6be3b28f9f61d7c1e8747bde688c7d

          SHA512

          8f267b401a48ed1931d376b2ed772cd003c363ee0808f69c449454123c87cdd2e711b56ba2fb11ae1809935dd0cbc7b3c115972537dce502657c73fddd1074d7

        • memory/1596-799-0x0000000000400000-0x0000000000407000-memory.dmp

          Filesize

          28KB