Overview

overview

10

Static

static

3

WinLock.exe

windows10-2004-x64

10

WinLock.exe

windows11-21h2-x64

10

Analysis

  • max time kernel
    133s
  • platform
    windows11-21h2_x64
  • resource
    win11-20260513-en
  • resource tags

    arch:x64arch:x86image:win11-20260513-enlocale:en-usos:windows11-21h2-x64systemwindows
  • submitted
    03/06/2026, 11:55

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General

  • Target
    WinLock.exe
  • Size 23KB
  • Sample260603-n3khlsfv2j
  • SHA256 197fbb6f6276eaf6c5dd3ab01abf94a9817cfbbb3bbac9cb0e2906c449b01b29
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
adwaredefense_evasionevasionexecutionimpactpersistenceransomwarespywaretrojan

Malware Config

Signatures

  • Modifies WinLogon for persistence 2 TTPs 2 IoCs
    persistence
  • UAC bypass 3 TTPs 2 IoCs
    defense_evasiontrojan
  • Deletes shadow copies 3 TTPs

    Ransomware often targets backup files to inhibit system recovery.

    ransomwaredefense_evasionimpactexecution
  • Modifies boot configuration data using bcdedit 1 TTPs 4 IoCs
    ransomwareevasion
  • Deletes System State backups 3 TTPs 2 IoCs

    Uses wbadmin.exe to inhibit system recovery.

    ransomware
  • Disables RegEdit via registry modification 2 IoCs
    defense_evasion
  • Disables Task Manager via registry modification
    defense_evasion
  • Executes dropped EXE 11 IoCs
  • Impair Defenses: Safe Mode Boot 1 TTPs 6 IoCs
    defense_evasion
  • Adds Run key to start application 2 TTPs 4 IoCs
    persistence
  • Checks whether UAC is enabled 1 TTPs 4 IoCs
    defense_evasiontrojan
  • Drops file in System32 directory 2 IoCs
  • Drops file in Windows directory 6 IoCs
  • Interacts with shadow copies 3 TTPs 2 IoCs

    Shadow copies are often targeted by ransomware to inhibit system recovery.

    ransomware
  • Modifies Control Panel 2 IoCs
    defense_evasion
  • Modifies Internet Explorer settings 1 TTPs 4 IoCs
    adwarespyware
  • Modifies registry class 8 IoCs
  • Modifies registry key 1 TTPs 2 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

    persistenceexecution
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 27 IoCs
  • Suspicious use of SetWindowsHookEx 4 IoCs
  • Suspicious use of WriteProcessMemory 24 IoCs
  • System policy modification 1 TTPs 2 IoCs
    defense_evasion
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

    persistence
  • Uses Volume Shadow Copy service COM API

    The Volume Shadow Copy service is used to manage backups/snapshots.

    ransomware

Processes

  • C:\Users\Admin\AppData\Local\Temp\WinLock.exe
    "C:\Users\Admin\AppData\Local\Temp\WinLock.exe"
    1⤵
    • Modifies WinLogon for persistence
    • UAC bypass
    • Disables RegEdit via registry modification
    • Adds Run key to start application
    • Checks whether UAC is enabled
    • Drops file in System32 directory
    • Modifies Control Panel
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    • System policy modification
    PID:2144
    • C:\Windows\system32\winlogon_sys.exe
      "C:\Windows\system32\winlogon_sys.exe" --watchdog 2144 "C:\Users\Admin\AppData\Local\Temp\WinLock.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:4788
    • C:\Windows\system32\winlogon_sys.exe
      "C:\Windows\system32\winlogon_sys.exe" --watchdog 2144 "C:\Users\Admin\AppData\Local\Temp\WinLock.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:6112
    • C:\Windows\system32\winlogon_sys.exe
      "C:\Windows\system32\winlogon_sys.exe" --watchdog 2144 "C:\Users\Admin\AppData\Local\Temp\WinLock.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:5192
    • C:\Windows\system32\winlogon_sys.exe
      "C:\Windows\system32\winlogon_sys.exe" --watchdog 2144 "C:\Users\Admin\AppData\Local\Temp\WinLock.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2172
    • C:\Windows\system32\winlogon_sys.exe
      "C:\Windows\system32\winlogon_sys.exe" --watchdog 2144 "C:\Users\Admin\AppData\Local\Temp\WinLock.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:4928
    • C:\Windows\SYSTEM32\vssadmin.exe
      "vssadmin" delete shadows /all /quiet
      2⤵
      • Interacts with shadow copies
      PID:4936
    • C:\Windows\SYSTEM32\wbadmin.exe
      "wbadmin" DELETE SYSTEMSTATEBACKUP -keepVersions:0 /quiet
      2⤵
      • Deletes System State backups
      • Drops file in Windows directory
      PID:4832
    • C:\Windows\SYSTEM32\bcdedit.exe
      "bcdedit" /set {default} recoveryenabled No
      2⤵
      • Modifies boot configuration data using bcdedit
      PID:6120
    • C:\Windows\SYSTEM32\bcdedit.exe
      "bcdedit" /set {default} bootstatuspolicy ignoreallfailures
      2⤵
      • Modifies boot configuration data using bcdedit
      PID:1056
    • C:\Windows\SYSTEM32\reg.exe
      "reg" copy HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot_Backup /s /f
      2⤵
        PID:4468
      • C:\Windows\SYSTEM32\reg.exe
        "reg" delete HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot /f
        2⤵
        • Impair Defenses: Safe Mode Boot
        • Modifies registry key
        PID:3724
      • C:\Windows\SYSTEM32\schtasks.exe
        "schtasks" /create /tn "Microsoft\Windows\SysMon" /tr "C:\Windows\system32\winlogon_sys.exe" /sc onlogon /rl highest /f
        2⤵
        • Scheduled Task/Job: Scheduled Task
        PID:4892
    • C:\Windows\system32\vssvc.exe
      C:\Windows\system32\vssvc.exe
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:4932
    • C:\Windows\system32\winlogon_sys.exe
      C:\Windows\system32\winlogon_sys.exe
      1⤵
      • Modifies WinLogon for persistence
      • UAC bypass
      • Disables RegEdit via registry modification
      • Executes dropped EXE
      • Adds Run key to start application
      • Checks whether UAC is enabled
      • Modifies Control Panel
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      • System policy modification
      PID:5412
      • C:\Windows\system32\winlogon_sys.exe
        "C:\Windows\system32\winlogon_sys.exe" --watchdog 5412 "C:\Windows\system32\winlogon_sys.exe"
        2⤵
        • Executes dropped EXE
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:2712
      • C:\Windows\system32\winlogon_sys.exe
        "C:\Windows\system32\winlogon_sys.exe" --watchdog 5412 "C:\Windows\system32\winlogon_sys.exe"
        2⤵
        • Executes dropped EXE
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:5616
      • C:\Windows\system32\winlogon_sys.exe
        "C:\Windows\system32\winlogon_sys.exe" --watchdog 5412 "C:\Windows\system32\winlogon_sys.exe"
        2⤵
        • Executes dropped EXE
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:5248
      • C:\Windows\system32\winlogon_sys.exe
        "C:\Windows\system32\winlogon_sys.exe" --watchdog 5412 "C:\Windows\system32\winlogon_sys.exe"
        2⤵
        • Executes dropped EXE
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:2076
      • C:\Windows\system32\winlogon_sys.exe
        "C:\Windows\system32\winlogon_sys.exe" --watchdog 5412 "C:\Windows\system32\winlogon_sys.exe"
        2⤵
        • Executes dropped EXE
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:5808
      • C:\Windows\system32\vssadmin.exe
        "vssadmin" delete shadows /all /quiet
        2⤵
        • Interacts with shadow copies
        PID:5280
      • C:\Windows\system32\wbadmin.exe
        "wbadmin" DELETE SYSTEMSTATEBACKUP -keepVersions:0 /quiet
        2⤵
        • Deletes System State backups
        • Drops file in Windows directory
        PID:4804
      • C:\Windows\system32\bcdedit.exe
        "bcdedit" /set {default} recoveryenabled No
        2⤵
        • Modifies boot configuration data using bcdedit
        PID:5732
      • C:\Windows\system32\bcdedit.exe
        "bcdedit" /set {default} bootstatuspolicy ignoreallfailures
        2⤵
        • Modifies boot configuration data using bcdedit
        PID:3844
      • C:\Windows\system32\reg.exe
        "reg" copy HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot_Backup /s /f
        2⤵
          PID:3264
        • C:\Windows\system32\reg.exe
          "reg" delete HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot /f
          2⤵
          • Modifies registry key
          PID:3236
        • C:\Windows\system32\schtasks.exe
          "schtasks" /create /tn "Microsoft\Windows\SysMon" /tr "C:\Windows\system32\winlogon_sys.exe" /sc onlogon /rl highest /f
          2⤵
          • Scheduled Task/Job: Scheduled Task
          PID:4536
      • C:\Windows\explorer.exe
        explorer.exe ,C:\Windows\system32\winlogon_sys.exe
        1⤵
          PID:1472
        • C:\Windows\explorer.exe
          C:\Windows\explorer.exe /factory,{75dff2b7-6936-4c06-a8bb-676a7b00b24b} -Embedding
          1⤵
          • Modifies Internet Explorer settings
          • Modifies registry class
          • Suspicious behavior: AddClipboardFormatListener
          • Suspicious use of SetWindowsHookEx
          PID:4436

        Network

              MITRE ATT&CK Enterprise v16

              Reconnaissance

              Resource Development

              Initial Access

              Execution

              Command and Scripting Interpreter

              1
              T1059

              Scheduled Task/Job

              1
              T1053

              Scheduled Task

              1
              T1053.005

              Windows Management Instrumentation

              1
              T1047

              Persistence

              Boot or Logon Autostart Execution

              2
              T1547

              Registry Run Keys / Startup Folder

              1
              T1547.001

              Winlogon Helper DLL

              1
              T1547.004

              Scheduled Task/Job

              1
              T1053

              Scheduled Task

              1
              T1053.005

              Privilege Escalation

              Abuse Elevation Control Mechanism

              1
              T1548

              Bypass User Account Control

              1
              T1548.002

              Boot or Logon Autostart Execution

              2
              T1547

              Registry Run Keys / Startup Folder

              1
              T1547.001

              Winlogon Helper DLL

              1
              T1547.004

              Scheduled Task/Job

              1
              T1053

              Scheduled Task

              1
              T1053.005

              Defense Evasion

              Abuse Elevation Control Mechanism

              1
              T1548

              Bypass User Account Control

              1
              T1548.002

              Direct Volume Access

              1
              T1006

              Impair Defenses

              2
              T1562

              Disable or Modify Tools

              1
              T1562.001

              Safe Mode Boot

              1
              T1562.009

              Indicator Removal

              3
              T1070

              File Deletion

              3
              T1070.004

              Modify Registry

              6
              T1112

              Credential Access

              Discovery

              Query Registry

              1
              T1012

              System Information Discovery

              1
              T1082

              Lateral Movement

              Collection

              Command and Control

              Exfiltration

              Impact

              Inhibit System Recovery

              4
              T1490

              Replay Monitor

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              Downloads

              winlogon_sys.exe
              • Path C:\Windows\System32\winlogon_sys.exe
              • Size 23KB
              • SHA256 197fbb6f6276eaf6c5dd3ab01abf94a9817cfbbb3bbac9cb0e2906c449b01b29
              • MD5 SHA1 SHA512 SSDEEP TLSH
              Submit Download

              memory/2144-0-0x0000020E3F7A0000-0x0000020E3F7AC000-memory.dmp
              Download