Analysis

  • max time kernel
    52s
  • max time network
    53s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    02-10-2024 19:31

General

  • Target

    8255e2d4929a77203721d93e3945e5cbf1fcaf3c2fe052b7cd18a5e0846e0dfe.exe

  • Size

    21KB

  • MD5

    14d1c2327c5bdde7656b7535f7936d92

  • SHA1

    20c05343aff8bc0661aa928c26bee1146ee7f454

  • SHA256

    8255e2d4929a77203721d93e3945e5cbf1fcaf3c2fe052b7cd18a5e0846e0dfe

  • SHA512

    195a525d09c977fa05acf5ac6eb7fc5690e83879555137c20838facf74bf7248ef15af2a2298e7bb02dc98e6bc61b37a6f11d8f7a0d4d7182447ac400d8618d9

  • SSDEEP

    384:U3Mg/bqo2b52NspBRdwdQJer91Cyu6eF:qqo2AspOdYer9x3eF

Malware Config

Signatures

  • Chaos

    Ransomware family first seen in June 2021.

  • Chaos Ransomware 2 IoCs
  • Deletes shadow copies 3 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Modifies boot configuration data using bcdedit 1 TTPs 2 IoCs
  • Renames multiple (197) files with added filename extension

    This suggests ransomware activity of encrypting all the files on the system.

  • 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 47 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\8255e2d4929a77203721d93e3945e5cbf1fcaf3c2fe052b7cd18a5e0846e0dfe.exe
    "C:\Users\Admin\AppData\Local\Temp\8255e2d4929a77203721d93e3945e5cbf1fcaf3c2fe052b7cd18a5e0846e0dfe.exe"
    1⤵
    • Checks computer location settings
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1652
    • C:\Users\Admin\AppData\Roaming\svchost.exe
      "C:\Users\Admin\AppData\Roaming\svchost.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:4564
      • 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:4952
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          4⤵
          • Interacts with shadow copies
          PID:764
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:3956
      • 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:4000
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:2748
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:2076
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:3740
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:4740
      • 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:3092
  • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
    "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=4160,i,4356837537417149674,16553092232944545509,262144 --variations-seed-version --mojo-platform-channel-handle=1412 /prefetch:8
    1⤵
      PID:4384
    • C:\Windows\system32\vssvc.exe
      C:\Windows\system32\vssvc.exe
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2300
    • C:\Windows\system32\wbengine.exe
      "C:\Windows\system32\wbengine.exe"
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1456
    • C:\Windows\System32\vdsldr.exe
      C:\Windows\System32\vdsldr.exe -Embedding
      1⤵
        PID:2788
      • C:\Windows\System32\vds.exe
        C:\Windows\System32\vds.exe
        1⤵
        • Checks SCSI registry key(s)
        PID:2060

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        21KB

        MD5

        14d1c2327c5bdde7656b7535f7936d92

        SHA1

        20c05343aff8bc0661aa928c26bee1146ee7f454

        SHA256

        8255e2d4929a77203721d93e3945e5cbf1fcaf3c2fe052b7cd18a5e0846e0dfe

        SHA512

        195a525d09c977fa05acf5ac6eb7fc5690e83879555137c20838facf74bf7248ef15af2a2298e7bb02dc98e6bc61b37a6f11d8f7a0d4d7182447ac400d8618d9

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

        Filesize

        15B

        MD5

        f80d41ba30a3302ce7695fb00847b7b1

        SHA1

        d49f02c98e7577e5c405437350c2b0e66ae11a54

        SHA256

        1132f98b986f4ce354f5f68e7d67f1d780e4d1ff414ec08d2896b06b1fee7d36

        SHA512

        53bd9dd8a457459d6936599260ddd0f88914b4e681324dad34cd8bc63e532d936e397e286bdf3f3f4b02dc7556cbacf559ecd5d739d29c9c1380321203fef8ae

      • memory/1652-0-0x00007FFAC73A3000-0x00007FFAC73A5000-memory.dmp

        Filesize

        8KB

      • memory/1652-1-0x0000000000380000-0x000000000038C000-memory.dmp

        Filesize

        48KB

      • memory/4564-14-0x00007FFAC73A0000-0x00007FFAC7E61000-memory.dmp

        Filesize

        10.8MB

      • memory/4564-460-0x00007FFAC73A0000-0x00007FFAC7E61000-memory.dmp

        Filesize

        10.8MB