Analysis

  • max time kernel
    144s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230831-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230831-enlocale:en-usos:windows10-2004-x64system
  • submitted
    06/09/2023, 17:37

General

  • Target

    WinRAR_JC.exe

  • Size

    270KB

  • MD5

    14ea366be5cb691078be2c302590f435

  • SHA1

    84e562bb99249a58849f6f82b29a7746dd144900

  • SHA256

    82e6b71b99a6ec602cfbdc00e0bbaf34c719d7b6879b6e384004886d491ad45a

  • SHA512

    9be5097295010fa04e04fcae578b19ab43935b09a70d8b31a038fd1ef7ed89dcd9143b82400e8d31913bf32a7a18628557dfaa1f4d37c1e7c8062d7a7368afb9

  • SSDEEP

    6144:r02q9t3hysg2+00aHYHjdCoD5oa+S/dIm:Aj3hBg/00aHYDd3DCO/dI

Malware Config

Extracted

Path

C:\Users\Admin\3D Objects\NOTE!.txt

Ransom Note
Don't worry, you can return all your files! All your files like documents, photos, databases and other important are encrypted What guarantees do we give to you? You can send 3 of your encrypted files and we decrypt it for free. You must follow these steps To decrypt your files : 1) Write on our e-mail :[email protected] ( In case of no answer in 24 hours check your spam folder or write us to this e-mail: [email protected]) 2) Obtain Bitcoin (You have to pay for decryption in Bitcoins. After payment we will send you the tool that will decrypt all your files.)

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.

  • Deletes backup catalog 3 TTPs 1 IoCs

    Uses wbadmin.exe to inhibit system recovery.

  • Disables Task Manager via registry modification
  • Checks computer location settings 2 TTPs 2 IoCs

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

  • 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).

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

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

  • Interacts with shadow copies 2 TTPs 1 IoCs

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

  • Modifies registry class 1 IoCs
  • Suspicious behavior: AddClipboardFormatListener 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 42 IoCs
  • Suspicious use of AdjustPrivilegeToken 50 IoCs
  • Suspicious use of WriteProcessMemory 14 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\WinRAR_JC.exe
    "C:\Users\Admin\AppData\Local\Temp\WinRAR_JC.exe"
    1⤵
    • Checks computer location settings
    • Suspicious behavior: AddClipboardFormatListener
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4924
    • C:\Users\Admin\AppData\Roaming\WinRAR.exe
      "C:\Users\Admin\AppData\Roaming\WinRAR.exe"
      2⤵
      • Checks computer location settings
      • Drops startup file
      • Executes dropped EXE
      • Adds Run key to start application
      • 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:1416
      • 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:2004
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          4⤵
          • Interacts with shadow copies
          PID:5092
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:1296
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1912
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:3572
      • C:\Windows\system32\NOTEPAD.EXE
        "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\NOTE!.txt
        3⤵
          PID:5760
    • C:\Windows\system32\vssvc.exe
      C:\Windows\system32\vssvc.exe
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:1924
    • C:\Windows\system32\wbengine.exe
      "C:\Windows\system32\wbengine.exe"
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:4564
    • C:\Windows\System32\vdsldr.exe
      C:\Windows\System32\vdsldr.exe -Embedding
      1⤵
        PID:1152
      • C:\Windows\System32\vds.exe
        C:\Windows\System32\vds.exe
        1⤵
        • Checks SCSI registry key(s)
        PID:5048

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

            • C:\Users\Admin\3D Objects\NOTE!.txt

              Filesize

              595B

              MD5

              7cff3b94ef1413349cdf9d4742f9cd77

              SHA1

              0569d834acc4a41e0b47bc1d03dcf27430106096

              SHA256

              bb6cdcdbb8d8b17243cce8bc7c9d7eee1872b63313640e5d63c63619712ddd8d

              SHA512

              1425864a3944742df1f4f849455c3224e2ee281b4c19dbc46af180efaaa1fb35dc14ef047faa02ba92e3d8b5a33ad60cc65c7b4ea9e1182a5b91d01e9edd2873

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

              Filesize

              1KB

              MD5

              baf55b95da4a601229647f25dad12878

              SHA1

              abc16954ebfd213733c4493fc1910164d825cac8

              SHA256

              ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924

              SHA512

              24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545

            • C:\Users\Admin\AppData\Roaming\NOTE!.txt

              Filesize

              595B

              MD5

              7cff3b94ef1413349cdf9d4742f9cd77

              SHA1

              0569d834acc4a41e0b47bc1d03dcf27430106096

              SHA256

              bb6cdcdbb8d8b17243cce8bc7c9d7eee1872b63313640e5d63c63619712ddd8d

              SHA512

              1425864a3944742df1f4f849455c3224e2ee281b4c19dbc46af180efaaa1fb35dc14ef047faa02ba92e3d8b5a33ad60cc65c7b4ea9e1182a5b91d01e9edd2873

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

              Filesize

              270KB

              MD5

              14ea366be5cb691078be2c302590f435

              SHA1

              84e562bb99249a58849f6f82b29a7746dd144900

              SHA256

              82e6b71b99a6ec602cfbdc00e0bbaf34c719d7b6879b6e384004886d491ad45a

              SHA512

              9be5097295010fa04e04fcae578b19ab43935b09a70d8b31a038fd1ef7ed89dcd9143b82400e8d31913bf32a7a18628557dfaa1f4d37c1e7c8062d7a7368afb9

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

              Filesize

              270KB

              MD5

              14ea366be5cb691078be2c302590f435

              SHA1

              84e562bb99249a58849f6f82b29a7746dd144900

              SHA256

              82e6b71b99a6ec602cfbdc00e0bbaf34c719d7b6879b6e384004886d491ad45a

              SHA512

              9be5097295010fa04e04fcae578b19ab43935b09a70d8b31a038fd1ef7ed89dcd9143b82400e8d31913bf32a7a18628557dfaa1f4d37c1e7c8062d7a7368afb9

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

              Filesize

              270KB

              MD5

              14ea366be5cb691078be2c302590f435

              SHA1

              84e562bb99249a58849f6f82b29a7746dd144900

              SHA256

              82e6b71b99a6ec602cfbdc00e0bbaf34c719d7b6879b6e384004886d491ad45a

              SHA512

              9be5097295010fa04e04fcae578b19ab43935b09a70d8b31a038fd1ef7ed89dcd9143b82400e8d31913bf32a7a18628557dfaa1f4d37c1e7c8062d7a7368afb9

            • C:\Users\Default\AppData\Roaming\Microsoft\Windows\SendTo\Fax Recipient.lnk

              Filesize

              1B

              MD5

              d1457b72c3fb323a2671125aef3eab5d

              SHA1

              5bab61eb53176449e25c2c82f172b82cb13ffb9d

              SHA256

              8a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1

              SHA512

              ca63c07ad35d8c9fb0c92d6146759b122d4ec5d3f67ebe2f30ddb69f9e6c9fd3bf31a5e408b08f1d4d9cd68120cced9e57f010bef3cde97653fed5470da7d1a0

            • memory/1416-16-0x00007FFBEFD20000-0x00007FFBF07E1000-memory.dmp

              Filesize

              10.8MB

            • memory/1416-17-0x000000001B3A0000-0x000000001B3B0000-memory.dmp

              Filesize

              64KB

            • memory/1416-1187-0x00007FFBEFD20000-0x00007FFBF07E1000-memory.dmp

              Filesize

              10.8MB

            • memory/1416-1188-0x000000001B3A0000-0x000000001B3B0000-memory.dmp

              Filesize

              64KB

            • memory/4924-15-0x00007FFBEFD20000-0x00007FFBF07E1000-memory.dmp

              Filesize

              10.8MB

            • memory/4924-0-0x0000000000B40000-0x0000000000B88000-memory.dmp

              Filesize

              288KB

            • memory/4924-2-0x000000001B810000-0x000000001B820000-memory.dmp

              Filesize

              64KB

            • memory/4924-1-0x00007FFBEFD20000-0x00007FFBF07E1000-memory.dmp

              Filesize

              10.8MB