Analysis

  • max time kernel
    50s
  • platform
    windows11-21h2_x64
  • resource
    win11-20250314-en
  • resource tags

    arch:x64arch:x86image:win11-20250314-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    24/03/2025, 18:17

General

  • Target

    Serverice.Host.local.exe

  • Size

    182KB

  • MD5

    d206dd07a32132a06af8fe1d0f3eec55

  • SHA1

    ac3c7dc216a9351905379f612bbe132906020384

  • SHA256

    1e10c6e0e448b51d612f5363b5b4edd2d52d3862287388e5172fdf0d3736dc0e

  • SHA512

    dbbfb14cdf7bc9fc02f210112be10bc9c410d2c8b9e48545313e39004fcab09c273cbe0d0e94a947483f760ca3e8c3824272973e14cec63a43a60f6336bf36ee

  • SSDEEP

    3072:2oLIVr9G3hCJxtY4sdP6VZn6ZCHGIQZT7TMPD6HCq4X:or9khCJLYiZnCCUZXTMbBq4

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.

  • 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
  • Sets desktop wallpaper using registry 2 TTPs 1 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 35 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\Serverice.Host.local.exe
    "C:\Users\Admin\AppData\Local\Temp\Serverice.Host.local.exe"
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:5808
    • C:\Users\Admin\AppData\Roaming\svchost.exe
      "C:\Users\Admin\AppData\Roaming\svchost.exe"
      2⤵
      • Drops startup file
      • Executes dropped EXE
      • Drops desktop.ini file(s)
      • Sets desktop wallpaper using registry
      • Modifies registry class
      • Suspicious behavior: AddClipboardFormatListener
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:5996
      • 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:348
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          4⤵
          • Interacts with shadow copies
          PID:2988
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:1820
      • 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:1412
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:2780
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:4744
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1508
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:1732
      • C:\Windows\system32\NOTEPAD.EXE
        "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\OPTIMUS_readme.txt
        3⤵
        • Opens file in notepad (likely ransom note)
        PID:1924
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:3112
  • C:\Windows\system32\wbengine.exe
    "C:\Windows\system32\wbengine.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:2832
  • C:\Windows\System32\vdsldr.exe
    C:\Windows\System32\vdsldr.exe -Embedding
    1⤵
      PID:1040
    • C:\Windows\System32\vds.exe
      C:\Windows\System32\vds.exe
      1⤵
      • Checks SCSI registry key(s)
      PID:5500

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

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

      Filesize

      182KB

      MD5

      d206dd07a32132a06af8fe1d0f3eec55

      SHA1

      ac3c7dc216a9351905379f612bbe132906020384

      SHA256

      1e10c6e0e448b51d612f5363b5b4edd2d52d3862287388e5172fdf0d3736dc0e

      SHA512

      dbbfb14cdf7bc9fc02f210112be10bc9c410d2c8b9e48545313e39004fcab09c273cbe0d0e94a947483f760ca3e8c3824272973e14cec63a43a60f6336bf36ee

    • C:\Users\Admin\Documents\OPTIMUS_readme.txt

      Filesize

      1KB

      MD5

      7741528464e9dabb2bf527618bb17b30

      SHA1

      d9cd59d1aeff9e5e94729a40ca12c01d635c5b8f

      SHA256

      adf04def25d25f7f21a87b76f55d27c3d28089c38290e3fabd153eebe26f92eb

      SHA512

      02ce6c4a0370511f893a02e7e37c7aeb0afaadb9d707e9be46bc28abdb4e1ed5eb8af8e2db1b55094b72bb8e906cd93960b35c0d0fe6c583157bd24080d18ee7

    • memory/5808-0-0x00007FF9D7C93000-0x00007FF9D7C95000-memory.dmp

      Filesize

      8KB

    • memory/5808-1-0x0000000000D90000-0x0000000000DC4000-memory.dmp

      Filesize

      208KB

    • memory/5996-14-0x00007FF9D7C90000-0x00007FF9D8752000-memory.dmp

      Filesize

      10.8MB

    • memory/5996-441-0x00007FF9D7C90000-0x00007FF9D8752000-memory.dmp

      Filesize

      10.8MB