Analysis

  • max time kernel
    150s
  • 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, 08:15

General

  • Target

    c3836316a31a4634f5c54d66fe14d38a8e0b533079ba19f0ff0ae9d5d1f26567.exe

  • Size

    24KB

  • MD5

    cd3f0a72b25ff0c8433d823d6bb6bfa8

  • SHA1

    692da6dfe5594c29394ef862b7a90c9db3a6c2a7

  • SHA256

    c3836316a31a4634f5c54d66fe14d38a8e0b533079ba19f0ff0ae9d5d1f26567

  • SHA512

    dfd9bbf1da81e3d7ef2f06915172ba869d7a9ffcd5a535ea7e8b5d7445a8d07ccff5a718adf9983a9a42570227dc4d7d4ac03484770f4086195a95b6d4d4ea08

  • SSDEEP

    384:hAg+5OCZ4W6/KWLsqmFae+rOAqmFae+rOIW2JhuC2JhuOxAxovAJOSAJOR:uZ4FLz8ae+rOn8ae+rOoJhiJh3AJLAJs

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 (5360) 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\c3836316a31a4634f5c54d66fe14d38a8e0b533079ba19f0ff0ae9d5d1f26567.exe
    "C:\Users\Admin\AppData\Local\Temp\c3836316a31a4634f5c54d66fe14d38a8e0b533079ba19f0ff0ae9d5d1f26567.exe"
    1⤵
    • Drops file in Program Files directory
    • System Location Discovery: System Language Discovery
    PID:2992

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

          24KB

          MD5

          bc59df5742c57d9911cb0e33c090f02f

          SHA1

          24cacc0b2dac4d1bf3de504e4f13e38eb91b9e30

          SHA256

          81a14cbffb905eb5781f81d0482971c43f3e89f9f55e267ec3e63b05ff01fa72

          SHA512

          27d545fad97dee151fa58694cd3c36bf17c7639aae0a1ac9e4ea56d5f884cb666b5b128d69104b5c0bbeb1a23dcaab983d8acb4080fa4bb7eddca1a549d59384

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

          Filesize

          105KB

          MD5

          6b31ea2cf7250c4d43497a88bc5c61bf

          SHA1

          f262d989dee2ec9f7056b47307408c4c08914a26

          SHA256

          a31f1920805be6622c937bc30076917589c875c6b9002256ed674d39d8288297

          SHA512

          0bf81ea5caaa705df4704be3b343cb457edbb2303af08995c18944e1fa9c0b089b90dc55e5bc38d4a5f1ebc676e4585d52857b15cd249bb1fd640e7ba8b9850b

        • memory/2992-1219-0x0000000000400000-0x0000000000407000-memory.dmp

          Filesize

          28KB