Resubmissions

22/03/2025, 17:59

250322-wk2ceaxzhs 10

22/03/2025, 17:55

250322-whwzxaxzes 10

Analysis

  • max time kernel
    61s
  • max time network
    64s
  • platform
    windows10-ltsc_2021_x64
  • resource
    win10ltsc2021-20250314-en
  • resource tags

    arch:x64arch:x86image:win10ltsc2021-20250314-enlocale:en-usos:windows10-ltsc_2021-x64system
  • submitted
    22/03/2025, 17:59

General

  • Target

    stub.exe

  • Size

    22KB

  • MD5

    8b75fae87885a0b1a0c3c2b601d6e399

  • SHA1

    120224bd569c681c4cbdf879f341145081bd9317

  • SHA256

    a00428527fb92182aa0fce541e09b4d7dcb19b00af756f5e15c2dc7c6747bf93

  • SHA512

    6719ae41b3918ba58a036e57720303f2b864797b77863834de14451bf8b524c6138e3ab74237258b2a32b8d04498debcda593adbcf418565e714f0506dd5f3c9

  • SSDEEP

    384:13MLWHn3kIkfMU9asv1zpd8R4+CTJJr91Cz7bSbeS:Fn3kInqLvFp64+6Jr9i7baeS

Malware Config

Signatures

  • Chaos

    Ransomware family first seen in June 2021.

  • Chaos Ransomware 2 IoCs
  • Chaos family
  • Deletes shadow copies 3 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Modifies boot configuration data using bcdedit 1 TTPs 2 IoCs
  • Deletes backup catalog 3 TTPs 1 IoCs

    Uses wbadmin.exe to inhibit system recovery.

  • Checks computer location settings 2 TTPs 2 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Drops startup file 3 IoCs
  • Executes dropped EXE 1 IoCs
  • Reads user/profile data of web browsers 3 TTPs

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

  • Drops desktop.ini file(s) 31 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Checks SCSI registry key(s) 3 TTPs 4 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Interacts with shadow copies 3 TTPs 1 IoCs

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

  • Modifies registry class 1 IoCs
  • Opens file in notepad (likely ransom note) 1 IoCs
  • Suspicious behavior: AddClipboardFormatListener 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 49 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 50 IoCs
  • Suspicious use of FindShellTrayWindow 9 IoCs
  • Suspicious use of SendNotifyMessage 8 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 20 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\stub.exe
    "C:\Users\Admin\AppData\Local\Temp\stub.exe"
    1⤵
    • Checks computer location settings
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3272
    • C:\Users\Admin\AppData\Roaming\stub.exe
      "C:\Users\Admin\AppData\Roaming\stub.exe"
      2⤵
      • Checks computer location settings
      • Drops startup file
      • Executes dropped EXE
      • Drops desktop.ini file(s)
      • Modifies registry class
      • Suspicious behavior: AddClipboardFormatListener
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:4416
      • 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:1732
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          4⤵
          • Interacts with shadow copies
          PID:5232
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:3252
      • 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:4656
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:4684
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:4704
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:4780
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:4944
      • C:\Windows\system32\NOTEPAD.EXE
        "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\read_it.txt
        3⤵
        • Opens file in notepad (likely ransom note)
        PID:1048
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:2816
  • C:\Windows\system32\wbengine.exe
    "C:\Windows\system32\wbengine.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:4868
  • C:\Windows\System32\vdsldr.exe
    C:\Windows\System32\vdsldr.exe -Embedding
    1⤵
      PID:552
    • C:\Windows\System32\vds.exe
      C:\Windows\System32\vds.exe
      1⤵
      • Checks SCSI registry key(s)
      PID:4896
    • C:\Windows\System32\rundll32.exe
      C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
      1⤵
        PID:5244
      • C:\Program Files\VideoLAN\VLC\vlc.exe
        "C:\Program Files\VideoLAN\VLC\vlc.exe" --started-from-file "C:\Users\Admin\Downloads\RegisterSearch.wvx"
        1⤵
        • Suspicious behavior: AddClipboardFormatListener
        • Suspicious behavior: GetForegroundWindowSpam
        • Suspicious use of FindShellTrayWindow
        • Suspicious use of SendNotifyMessage
        • Suspicious use of SetWindowsHookEx
        PID:3988

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

      • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\stub.exe.log

        Filesize

        226B

        MD5

        b92bd19c1a9416298a873dfa43b439b7

        SHA1

        7b96a8874aff3a502363f4168332613ebc53d64e

        SHA256

        1ac8854abd01c202cf82e4ccdf80bf50319c59bc7a02dce2b19cecfedf7dd4ba

        SHA512

        5910691ebdd78a2740117b14f146629874682d196f518f479b8bcb754ed2501a009fc465cb9e3685f7aed8ced7b435690de2b8b8439117abb5f61dc4996387a6

      • C:\Users\Admin\AppData\Roaming\stub.exe

        Filesize

        22KB

        MD5

        8b75fae87885a0b1a0c3c2b601d6e399

        SHA1

        120224bd569c681c4cbdf879f341145081bd9317

        SHA256

        a00428527fb92182aa0fce541e09b4d7dcb19b00af756f5e15c2dc7c6747bf93

        SHA512

        6719ae41b3918ba58a036e57720303f2b864797b77863834de14451bf8b524c6138e3ab74237258b2a32b8d04498debcda593adbcf418565e714f0506dd5f3c9

      • C:\Users\Admin\Desktop\read_it.txt

        Filesize

        961B

        MD5

        76cf4b4b048d3adad48300ddb890b166

        SHA1

        1099a3ea6d9b92ff9e9fb1fbcaa51b907c65f911

        SHA256

        55cd6766a0830a3e75eac538e955baa64a2aa5c7ca56661d080919cbe87ea472

        SHA512

        0ac5807d857cf75ed64bbcd5fcd70d98e08f6a625f774da1402c56228aa492603a578d9461e388f793d3b718d7a19a659e68bb0a043013fb3ce02d71f5b20b4b

      • memory/3272-0-0x0000000000550000-0x000000000055C000-memory.dmp

        Filesize

        48KB

      • memory/3272-1-0x00007FFB26F13000-0x00007FFB26F15000-memory.dmp

        Filesize

        8KB

      • memory/3988-80-0x00007FF79DE60000-0x00007FF79DF58000-memory.dmp

        Filesize

        992KB

      • memory/3988-81-0x00007FFB1FBB0000-0x00007FFB1FBE4000-memory.dmp

        Filesize

        208KB

      • memory/3988-82-0x00007FFB1F8F0000-0x00007FFB1FBA6000-memory.dmp

        Filesize

        2.7MB

      • memory/3988-83-0x00007FFB1D640000-0x00007FFB1E6F0000-memory.dmp

        Filesize

        16.7MB

      • memory/4416-5-0x00007FFB26F10000-0x00007FFB279D2000-memory.dmp

        Filesize

        10.8MB

      • memory/4416-64-0x00007FFB26F10000-0x00007FFB279D2000-memory.dmp

        Filesize

        10.8MB

      • memory/4416-66-0x00007FFB26F10000-0x00007FFB279D2000-memory.dmp

        Filesize

        10.8MB