Analysis

  • max time kernel
    361s
  • max time network
    364s
  • platform
    windows7_x64
  • resource
    win7-20230831-en
  • resource tags

    arch:x64arch:x86image:win7-20230831-enlocale:en-usos:windows7-x64system
  • submitted
    21/09/2023, 13:59

General

  • Target

    b4a6bb188816bca1edb65946c49c7439e53913165cb457ca0fafdcb91b7bf2ee.exe

  • Size

    519KB

  • MD5

    5526856582dad856c83aa26b7c060729

  • SHA1

    a067c86e442f7c5dddb1617b7999f416ee28346f

  • SHA256

    b4a6bb188816bca1edb65946c49c7439e53913165cb457ca0fafdcb91b7bf2ee

  • SHA512

    4fe75e50f5e9feb8070e5de83b20ab2355597ece4343f035fed600b6ca4fd7aadb8067c7e4d2683c5bf1610a7fd24ed8d21356171996e8c2003ec21fae0b21b4

  • SSDEEP

    12288:+Ul9c/i/C01H3dfy9pxtNWtpjVf+JCZ7oaI+2tXEEEG:JCE6ZawvE

Malware Config

Extracted

Path

C:\ProgramData\Adobe\Updater6\READ-THIS.txt

Ransom Note
The Eldritch Team Don't worry, you can return all your files! All your files like documents, photos, databases and other important are encrypted You have only 24 hours to contact us, or you will never see anything, ever, again. What guarantees do we give to you? - After payment, files will no longer be encrypted You must follow these steps To decrypt your files : 1) Contact us on our e-mail [email protected] ( In case of no answer in 24 hours check your spam folder ) 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 5 IoCs
  • Deletes shadow copies 2 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.

  • Disables Task Manager via registry modification
  • 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).

  • Interacts with shadow copies 2 TTPs 1 IoCs

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

  • Suspicious behavior: AddClipboardFormatListener 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of AdjustPrivilegeToken 48 IoCs
  • Suspicious use of WriteProcessMemory 30 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\b4a6bb188816bca1edb65946c49c7439e53913165cb457ca0fafdcb91b7bf2ee.exe
    "C:\Users\Admin\AppData\Local\Temp\b4a6bb188816bca1edb65946c49c7439e53913165cb457ca0fafdcb91b7bf2ee.exe"
    1⤵
    • Suspicious behavior: AddClipboardFormatListener
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2172
    • C:\Users\Admin\AppData\Roaming\svchost.exe
      "C:\Users\Admin\AppData\Roaming\svchost.exe"
      2⤵
      • Drops startup file
      • Executes dropped EXE
      • Adds Run key to start application
      • Drops desktop.ini file(s)
      • Sets desktop wallpaper using registry
      • Suspicious behavior: AddClipboardFormatListener
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:2412
      • 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:2668
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          4⤵
          • Interacts with shadow copies
          PID:2820
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:2532
      • 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:1072
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:2040
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:2428
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1756
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:2356
      • C:\Windows\system32\NOTEPAD.EXE
        "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\READ-THIS.txt
        3⤵
          PID:236
    • C:\Windows\system32\vssvc.exe
      C:\Windows\system32\vssvc.exe
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2396
    • C:\Windows\system32\wbengine.exe
      "C:\Windows\system32\wbengine.exe"
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2036
    • C:\Windows\System32\vdsldr.exe
      C:\Windows\System32\vdsldr.exe -Embedding
      1⤵
        PID:2364
      • C:\Windows\System32\vds.exe
        C:\Windows\System32\vds.exe
        1⤵
          PID:1732

        Network

              MITRE ATT&CK Enterprise v15

              Replay Monitor

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              Downloads

              • C:\ProgramData\Adobe\Updater6\READ-THIS.txt

                Filesize

                643B

                MD5

                da0c595fea489ba8d78fa6a6eb1068db

                SHA1

                7e3caa05af6c71716279b4d8be58eadba683949a

                SHA256

                bcba1b82b40287f24986f26956110cbb8ff0ed6c367ff5629a93248d0921edfa

                SHA512

                54ba69836d89984c918b66378e9449d752338d472498e16103ad26f05e92d9b62875aa1cfaca69e59d4178863d85727a8240616739ade16d1ceb53ac07cc44bc

              • C:\Users\Admin\AppData\Roaming\READ-THIS.txt

                Filesize

                643B

                MD5

                da0c595fea489ba8d78fa6a6eb1068db

                SHA1

                7e3caa05af6c71716279b4d8be58eadba683949a

                SHA256

                bcba1b82b40287f24986f26956110cbb8ff0ed6c367ff5629a93248d0921edfa

                SHA512

                54ba69836d89984c918b66378e9449d752338d472498e16103ad26f05e92d9b62875aa1cfaca69e59d4178863d85727a8240616739ade16d1ceb53ac07cc44bc

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

                Filesize

                519KB

                MD5

                5526856582dad856c83aa26b7c060729

                SHA1

                a067c86e442f7c5dddb1617b7999f416ee28346f

                SHA256

                b4a6bb188816bca1edb65946c49c7439e53913165cb457ca0fafdcb91b7bf2ee

                SHA512

                4fe75e50f5e9feb8070e5de83b20ab2355597ece4343f035fed600b6ca4fd7aadb8067c7e4d2683c5bf1610a7fd24ed8d21356171996e8c2003ec21fae0b21b4

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

                Filesize

                519KB

                MD5

                5526856582dad856c83aa26b7c060729

                SHA1

                a067c86e442f7c5dddb1617b7999f416ee28346f

                SHA256

                b4a6bb188816bca1edb65946c49c7439e53913165cb457ca0fafdcb91b7bf2ee

                SHA512

                4fe75e50f5e9feb8070e5de83b20ab2355597ece4343f035fed600b6ca4fd7aadb8067c7e4d2683c5bf1610a7fd24ed8d21356171996e8c2003ec21fae0b21b4

              • C:\Users\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Notepad.lnk

                Filesize

                1B

                MD5

                d1457b72c3fb323a2671125aef3eab5d

                SHA1

                5bab61eb53176449e25c2c82f172b82cb13ffb9d

                SHA256

                8a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1

                SHA512

                ca63c07ad35d8c9fb0c92d6146759b122d4ec5d3f67ebe2f30ddb69f9e6c9fd3bf31a5e408b08f1d4d9cd68120cced9e57f010bef3cde97653fed5470da7d1a0

              • memory/2172-2-0x000000001AFD0000-0x000000001B050000-memory.dmp

                Filesize

                512KB

              • memory/2172-0-0x0000000000EA0000-0x0000000000F28000-memory.dmp

                Filesize

                544KB

              • memory/2172-324-0x000007FEF5200000-0x000007FEF5BEC000-memory.dmp

                Filesize

                9.9MB

              • memory/2172-1-0x000007FEF5200000-0x000007FEF5BEC000-memory.dmp

                Filesize

                9.9MB

              • memory/2412-8-0x00000000013D0000-0x0000000001458000-memory.dmp

                Filesize

                544KB

              • memory/2412-9-0x000007FEF5200000-0x000007FEF5BEC000-memory.dmp

                Filesize

                9.9MB

              • memory/2412-10-0x0000000000C50000-0x0000000000CD0000-memory.dmp

                Filesize

                512KB

              • memory/2412-917-0x000007FEF5200000-0x000007FEF5BEC000-memory.dmp

                Filesize

                9.9MB