Overview

overview

10

Static

static

10

2026-04-21...ry.exe

windows10-2004-x64

10

2026-04-21...ry.exe

windows11-21h2-x64

10

Analysis

  • max time kernel
    150s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20260130-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20260130-enlocale:en-usos:windows10-2004-x64systemwindows
  • submitted
    21/04/2026, 23:24

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General

  • Target
    2026-04-21_af9d8c9a0961dd768c1ba59304dd4a7f_cobalt-strike_elex_hijackloader_vidar_wannacry.exe
  • Size 511KB
  • Sample260421-3dvplshs8v
  • SHA256 c0a92327650bd61614231f507723e01fb8f7c69ceec911f79b1fce401fa3f40c
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
discoverycosmuransomwarespywarestealerworm

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++.

  • Custom signature
    Detects executables packed with eXPressor 4 IoCs
  • Renames multiple (3396) files with added filename extension

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

    ransomware
  • Executes dropped EXE 2 IoCs
  • Reads user/profile data of web browsers 3 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

    spywarestealer
  • Drops file in System32 directory 2 IoCs
  • Drops file in Program Files directory 64 IoCs
  • Browser Information Discovery 1 TTPs

    Enumerate browser information.

    discovery
  • 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 behavior: EnumeratesProcesses 18 IoCs
  • Suspicious use of WriteProcessMemory 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2026-04-21_af9d8c9a0961dd768c1ba59304dd4a7f_cobalt-strike_elex_hijackloader_vidar_wannacry.exe
    "C:\Users\Admin\AppData\Local\Temp\2026-04-21_af9d8c9a0961dd768c1ba59304dd4a7f_cobalt-strike_elex_hijackloader_vidar_wannacry.exe"
    1⤵
    • Drops file in System32 directory
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4848
    • 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:4976
    • C:\Users\Admin\AppData\Local\Temp\_AcroServicesUpdater2_x64.exe
      "_AcroServicesUpdater2_x64.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious behavior: EnumeratesProcesses
      PID:4280

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        desktop.ini.exe
        • Path C:\$Recycle.Bin\S-1-5-21-1609746302-1884177235-1125644204-1000\desktop.ini.exe
        • Size 392KB
        • SHA256 23472e88ceedd73262ee46cd28d2c3923ce241b869a57b82f0e82eeaab65f746
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        S3[1].htm
        • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\INetCache\IE\CRFV07G3\S3[1].htm
        • Size 13B
        • SHA256 b633a587c652d02386c4f16f8c6f6aab7352d97f16367c3c40576214372dd628
        • MD5 SHA1 SHA512
        Submit Download

        _AcroServicesUpdater2_x64.exe
        • Path C:\Users\Admin\AppData\Local\Temp\_AcroServicesUpdater2_x64.exe
        • Size 119KB
        • SHA256 99727a25e431134f75c9342ca608d1007ea31733f7fd4dda32356e5e36c23f9b
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        Zombie.exe
        • Path C:\Windows\SysWOW64\Zombie.exe
        • Size 392KB
        • SHA256 94b7efe325b4efc629383785d00ec3a65412d817a8ea048dc85a6cc04e87d9fc
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        memory/4280-321-0x00000201D8610000-0x00000201D8618000-memory.dmp
        Download

        memory/4848-0-0x0000000000400000-0x000000000040A000-memory.dmp
        Download

        memory/4848-322-0x0000000000400000-0x000000000040A000-memory.dmp
        Download

        memory/4848-323-0x00000000008C0000-0x00000000009E0000-memory.dmp
        Download

        memory/4976-478-0x00000000008B0000-0x00000000009D0000-memory.dmp
        Download

        memory/4976-4714-0x00000000008B0000-0x00000000009D0000-memory.dmp
        Download