Analysis

  • max time kernel
    119s
  • max time network
    119s
  • platform
    windows7_x64
  • resource
    win7-20231215-en
  • resource tags

    arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system
  • submitted
    20/02/2024, 11:38

General

  • Target
    2024-02-20_82e9d7ead2705f060c47d00f6095f968_wannacry.exe
  • Size 210KB
  • Sample240220-nrrsjsfe7x
  • SHA256 a2837287e1dd493f83ad6a175ecb41fe7c3bbae96f1976e704ad5503ec4319a8
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • Chaos

    Ransomware family first seen in June 2021.

  • Chaos Ransomware 4 IoCs
  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Detects command variations typically used by ransomware 4 IoCs
  • Detects executables containing many references to VEEAM. Observed in ransomware 4 IoCs
  • Detects executables packed with ConfuserEx Mod 4 IoCs
  • Modifies boot configuration data using bcdedit 1 TTPs 2 IoCs
  • Deletes backup catalog 3 TTPs 1 IoCs

    Uses wbadmin.exe to inhibit system recovery.

  • Disables Task Manager via registry modification
  • Drops startup file 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Reads user/profile data of web browsers 2 TTPs

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

  • Adds Run key to start application 2 TTPs 1 IoCs
  • Drops desktop.ini file(s) 64 IoCs
  • Sets desktop wallpaper using registry 2 TTPs 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Interacts with shadow copies 2 TTPs 1 IoCs

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

  • Opens file in notepad (likely ransom note) 1 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious use of AdjustPrivilegeToken 48 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs
  • 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.

  • Uses Volume Shadow Copy service COM API

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\2024-02-20_82e9d7ead2705f060c47d00f6095f968_wannacry.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-02-20_82e9d7ead2705f060c47d00f6095f968_wannacry.exe"
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1992
    • C:\Users\Admin\AppData\Roaming\svchost.exe
      "C:\Users\Admin\AppData\Roaming\svchost.exe"
      2⤵
      • Drops startup file
      • Executes dropped EXE
      • Adds Run key to start application
      • Drops desktop.ini file(s)
      • Sets desktop wallpaper using registry
      • Suspicious behavior: AddClipboardFormatListener
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:2316
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2872
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          4⤵
          • Interacts with shadow copies
          PID:2876
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:2336
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C bcdedit /set {default} bootstatuspolicy ignoreallfailures & bcdedit /set {default} recoveryenabled no
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2764
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:2800
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:2788
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2648
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:2748
      • C:\Windows\system32\NOTEPAD.EXE
        "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\note.txt
        3⤵
        • Opens file in notepad (likely ransom note)
        PID:2480
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:2720
  • C:\Windows\system32\wbengine.exe
    "C:\Windows\system32\wbengine.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:1584
  • C:\Windows\System32\vdsldr.exe
    C:\Windows\System32\vdsldr.exe -Embedding
    1⤵
      PID:1568
    • C:\Windows\System32\vds.exe
      C:\Windows\System32\vds.exe
      1⤵
        PID:1792

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

            note.txt

            • Path C:\Users\Admin\AppData\Local\Google\Chrome\User Data\note.txt
            • Size 31B
            • SHA256 85db473b0312caeffcc34f62599f81224af00fa1ad27d2ce6c06d5bca44c8baf
            • MD5 SHA1 SHA512

            svchost.exe

            • Path C:\Users\Admin\AppData\Roaming\svchost.exe
            • Size 210KB
            • SHA256 a2837287e1dd493f83ad6a175ecb41fe7c3bbae96f1976e704ad5503ec4319a8
            • MD5 SHA1 SHA512 SSDEEP

            ConnectRedo.png

            • Path C:\Users\Admin\Desktop\ConnectRedo.png
            • Size 1B
            • SHA256 8a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1
            • MD5 SHA1 SHA512

            memory/1992-0-0x0000000000BB0000-0x0000000000BEA000-memory.dmp

            memory/1992-1-0x000007FEF5EC0000-0x000007FEF68AC000-memory.dmp

            memory/1992-2-0x000000001AEB0000-0x000000001AF30000-memory.dmp

            memory/1992-218-0x000007FEF5EC0000-0x000007FEF68AC000-memory.dmp

            memory/2316-8-0x0000000000980000-0x00000000009BA000-memory.dmp

            memory/2316-9-0x000007FEF5EC0000-0x000007FEF68AC000-memory.dmp

            memory/2316-950-0x000007FEF5EC0000-0x000007FEF68AC000-memory.dmp

            memory/2316-951-0x00000000003A0000-0x0000000000420000-memory.dmp