Overview

overview

10

Static

static

10

2026-08-24...ry.exe

windows10-2004-x64

10

2026-08-24...ry.exe

windows11-ltsc_2024-x64

10

Analysis

  • max time kernel
    150s
  • max time network
    146s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260709-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    25/08/2026, 02:38

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General

  • Target
    2026-08-24_bb8f545def5877ebb770205a17cb145b_cobalt-strike_elex_vidar_wannacry.exe
  • Size 81KB
  • Sample260825-c4z4xaej2z
  • SHA256 c509d468fa02c09ee9eb1eb49be86832c49c027ea56e40896c827b1c7762f2c2
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
discoverycosmuransomwareworm

Malware Config

Signatures

  • Family: Cosmu

    Cosmu is a Windows worm written in C++.

    wormcosmu
  • Detects Cosmu payload 4 IoCs

    Cosmu is a worm written in C++.

  • Detects executables packed with eXPressor 4 IoCs
  • Renames multiple (4886) files with added filename extension

    This suggests ransomware activity of encrypting all the files on the system.

    ransomware
  • Executes dropped EXE 2 IoCs
  • Drops file in System32 directory 2 IoCs
  • Drops file in Program Files directory 64 IoCs
  • System Location Discovery: System Language Discovery 1 TTPs 2 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

    discovery
  • Suspicious use of WriteProcessMemory 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2026-08-24_bb8f545def5877ebb770205a17cb145b_cobalt-strike_elex_vidar_wannacry.exe
    "C:\Users\Admin\AppData\Local\Temp\2026-08-24_bb8f545def5877ebb770205a17cb145b_cobalt-strike_elex_vidar_wannacry.exe"
    1⤵
    • Drops file in System32 directory
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1392
    • C:\Users\Admin\AppData\Local\Temp\_createdump.exe
      "_createdump.exe"
      2⤵
      • Executes dropped EXE
      PID:4768
    • C:\Windows\SysWOW64\Zombie.exe
      "C:\Windows\system32\Zombie.exe"
      2⤵
      • Executes dropped EXE
      • Drops file in Program Files directory
      • System Location Discovery: System Language Discovery
      PID:4684

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        desktop.ini.tmp
        • Path C:\$Recycle.Bin\S-1-5-21-552508041-2681165170-3229858294-1000\desktop.ini.tmp
        • Size 25KB
        • SHA256 dacd0501c981198e93e565b4ab45dfd93aef487b824d760da63905aa220e008e
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        _createdump.exe
        • Path C:\Users\Admin\AppData\Local\Temp\_createdump.exe
        • Size 56KB
        • SHA256 5113e7ae92f3a7aebc7f8e363209866d4d743b06a26c67e0886979a56fd3a10d
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        Zombie.exe
        • Path C:\Windows\SysWOW64\Zombie.exe
        • Size 25KB
        • SHA256 1b1a1f646c128b24be68314d4bb6e6f4c6c1bd91dd6bbf20c5c1985d66b7405f
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        memory/1392-0-0x0000000000400000-0x0000000000409D5C-memory.dmp
        Download

        memory/1392-23-0x0000000000400000-0x0000000000409D5C-memory.dmp
        Download