Overview

overview

10

Static

static

10

2026-05-16...ry.exe

windows10-2004-x64

10

2026-05-16...ry.exe

windows11-21h2-x64

10

Analysis

  • max time kernel
    150s
  • max time network
    101s
  • platform
    windows11-21h2_x64
  • resource
    win11-20260513-en
  • resource tags

    arch:x64arch:x86image:win11-20260513-enlocale:en-usos:windows11-21h2-x64systemwindows
  • submitted
    16/05/2026, 03:44

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General

  • Target
    2026-05-16_864869ad0d769ed87371fce78bb49548_cobalt-strike_elex_hijackloader_vidar_wannacry.exe
  • Size 394KB
  • Sample260516-eahc4sdy2k
  • SHA256 10fe8601c564765224feba978bbb1aa85808715bcafbf51aded2780161099c57
  • 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++.

  • Renames multiple (4961) 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\2026-05-16_864869ad0d769ed87371fce78bb49548_cobalt-strike_elex_hijackloader_vidar_wannacry.exe
    "C:\Users\Admin\AppData\Local\Temp\2026-05-16_864869ad0d769ed87371fce78bb49548_cobalt-strike_elex_hijackloader_vidar_wannacry.exe"
    1⤵
    • Drops file in System32 directory
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:5636
    • 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:4344
    • C:\Users\Admin\AppData\Local\Temp\_AcroBroker.exe
      "_AcroBroker.exe"
      2⤵
      • Executes dropped EXE
      PID:5004

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        desktop.ini.exe
        • Path C:\$Recycle.Bin\S-1-5-21-1768642833-2142038154-4041560723-1000\desktop.ini.exe
        • Size 59KB
        • SHA256 91cc7edf3b6794b75be0456c249c4fe301f9d7c6ac01fb47bb1abfd00c680cab
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        _AcroBroker.exe
        • Path C:\Users\Admin\AppData\Local\Temp\_AcroBroker.exe
        • Size 335KB
        • SHA256 79a2261c25a1a5a4122b634d963df316ed5bcb835ac26e347cde39761b6adef7
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        Zombie.exe
        • Path C:\Windows\SysWOW64\Zombie.exe
        • Size 59KB
        • SHA256 fcde4d8ce47bb35fd9b06b0825673644b4c2cc33b0eefbe1e074a49220b45572
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        memory/5636-0-0x0000000000400000-0x0000000000408000-memory.dmp
        Download

        memory/5636-14-0x0000000000400000-0x0000000000408000-memory.dmp
        Download