Analysis

  • max time kernel
    102s
  • max time network
    134s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20250314-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20250314-enlocale:en-usos:windows10-2004-x64system
  • submitted
    22/03/2025, 18:02

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) 34 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 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 55 IoCs
  • Suspicious use of AdjustPrivilegeToken 50 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:5760
    • 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:4636
      • 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:4840
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          4⤵
          • Interacts with shadow copies
          PID:4992
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:4784
      • 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:3216
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:5496
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:3992
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:5508
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:3552
      • 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:3136
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:4780
  • C:\Windows\system32\wbengine.exe
    "C:\Windows\system32\wbengine.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:5824
  • C:\Windows\System32\vdsldr.exe
    C:\Windows\System32\vdsldr.exe -Embedding
    1⤵
      PID:2672
    • C:\Windows\System32\vds.exe
      C:\Windows\System32\vds.exe
      1⤵
      • Checks SCSI registry key(s)
      PID:920

    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

      28d7fcc2b910da5e67ebb99451a5f598

      SHA1

      a5bf77a53eda1208f4f37d09d82da0b9915a6747

      SHA256

      2391511d0a66ed9f84ae54254f51c09e43be01ad685db80da3201ec880abd49c

      SHA512

      2d8eb65cbf04ca506f4ef3b9ae13ccf05ebefab702269ba70ffd1ce9e6c615db0a3ee3ac0e81a06f546fc3250b7b76155dd51241c41b507a441b658c8e761df6

    • 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/4636-15-0x00007FF9C1BD0000-0x00007FF9C2691000-memory.dmp

      Filesize

      10.8MB

    • memory/4636-71-0x00007FF9C1BD0000-0x00007FF9C2691000-memory.dmp

      Filesize

      10.8MB

    • memory/4636-73-0x00007FF9C1BD0000-0x00007FF9C2691000-memory.dmp

      Filesize

      10.8MB

    • memory/5760-0-0x00007FF9C1BD3000-0x00007FF9C1BD5000-memory.dmp

      Filesize

      8KB

    • memory/5760-1-0x0000000000EC0000-0x0000000000ECC000-memory.dmp

      Filesize

      48KB