Analysis

  • max time kernel
    150s
  • max time network
    49s
  • platform
    windows7_x64
  • resource
    win7-20220901-en
  • resource tags

    arch:x64arch:x86image:win7-20220901-enlocale:en-usos:windows7-x64system
  • submitted
    28/11/2022, 17:23

General

  • Target
    d6f34c4fb40c7f7cf66efbf0eb1bfd3a55089f65181d4d0c2de3c183f7527c79.exe
  • Size 954KB
  • Sample221128-vybs8sfh7t
  • SHA256 d6f34c4fb40c7f7cf66efbf0eb1bfd3a55089f65181d4d0c2de3c183f7527c79
  • MD5 SHA1 SHA512 SSDEEP
Score
10/10

Malware Config

Extracted

Path
  • C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\!Decrypt-All-Files-abrgzxi.txt

Ransom Note
  • Your documents, photos, databases and other important files have been encrypted with strongest encryption and unique key, generated for this computer. Private decryption key is stored on a secret Internet server and nobody can decrypt your files until you pay and obtain the private key. If you see the main locker window, follow the instructions on the locker. Overwise, it's seems that you or your antivirus deleted the locker program. Now you have the last chance to decrypt your files. Open http://pf5dahldauhrjxfd.onion.cab or http://pf5dahldauhrjxfd.tor2web.org in your browser. They are public gates to the secret server. If you have problems with gates, use direct connection: 1. Download Tor Browser from http://torproject.org 2. In the Tor Browser open the http://pf5dahldauhrjxfd.onion/ Note that this server is available via Tor Browser only. Retry in 1 hour if site is not reachable. Copy and paste the following public key in the input form on server. Avoid missprints. PNTWLNP-5NWGYBY-HS7X4XB-DY6SQPM-BXFCXEV-MUHL6HZ-WGQFIHD-ZRMFJ4A I2FW5N3-37XBAXS-G447I4Z-JPRW5WY-JQJMJLE-7I3GVVO-4LT2PL7-7HYKKMN HJUN2YH-RV2ITAE-XAF5UTN-IQJYHI2-GC26EHO-UISSXP6-HUSJ7YY-IIMVDCG Follow the instructions on the server.
URLs
  • http://pf5dahldauhrjxfd.onion.cab

  • http://pf5dahldauhrjxfd.tor2web.org

  • http://pf5dahldauhrjxfd.onion/

Extracted

Path
  • C:\Users\Admin\Documents\!Decrypt-All-Files-abrgzxi.txt

Ransom Note
  • Your documents, photos, databases and other important files have been encrypted with strongest encryption and unique key, generated for this computer. Private decryption key is stored on a secret Internet server and nobody can decrypt your files until you pay and obtain the private key. If you see the main locker window, follow the instructions on the locker. Overwise, it's seems that you or your antivirus deleted the locker program. Now you have the last chance to decrypt your files. Open http://pf5dahldauhrjxfd.onion.cab or http://pf5dahldauhrjxfd.tor2web.org in your browser. They are public gates to the secret server. If you have problems with gates, use direct connection: 1. Download Tor Browser from http://torproject.org 2. In the Tor Browser open the http://pf5dahldauhrjxfd.onion/ Note that this server is available via Tor Browser only. Retry in 1 hour if site is not reachable. Copy and paste the following public key in the input form on server. Avoid missprints. PNTWLNP-5NWGYBY-HS7X4XB-DY6SQPM-BXFCXEV-MUHL6HZ-WGQFIHD-ZRMFJ4A I2FW5N3-37XBAXS-G447I4Z-JPRW5WY-JQJMJLE-7I3GVVO-4LT2PL7-7HYKKMN HJUN2YH-RV2ITAE-XAF5UTN-IQJYHI2-GC26WVO-QRSSXP6-HUSJ7YY-IIMFPIT Follow the instructions on the server.
URLs
  • http://pf5dahldauhrjxfd.onion.cab

  • http://pf5dahldauhrjxfd.tor2web.org

  • http://pf5dahldauhrjxfd.onion/

Extracted

Path
  • C:\ProgramData\zlwdkgg.html

Ransom Note
  • Your documents, photos, databases and other important files have been encrypted with strongest encryption and unique key, generated for this computer. Private decryption key is stored on a secret Internet server and nobody can decrypt your files until you pay and obtain the private key. If you see the main locker window, follow the instructions on the locker. Overwise, it's seems that you or your antivirus deleted the locker program. Now you have the last chance to decrypt your files. Open http://pf5dahldauhrjxfd.onion.cab or http://pf5dahldauhrjxfd.tor2web.org in your browser. They are public gates to the secret server. If you have problems with gates, use direct connection: 1. Download Tor Browser from http://torproject.org. 2. In the Tor Browser open the http://pf5dahldauhrjxfd.onion Note that this server is available via Tor Browser only. Retry in 1 hour if site is not reachable. Copy and paste the following public key in the input form on server. Avoid missprints. Follow the instructions on the server. The list of your encrypted files: Path File
URLs
  • http://pf5dahldauhrjxfd.onion.cab

  • http://pf5dahldauhrjxfd.tor2web.org

  • http://pf5dahldauhrjxfd.onion

Signatures

  • CTB-Locker

    Ransomware family which uses Tor to hide its C2 communications.

  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Executes dropped EXE 4 IoCs
  • Modifies extensions of user files 3 IoCs

    Ransomware generally changes the extension on encrypted files.

  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Drops desktop.ini file(s) 1 IoCs
  • Drops file in System32 directory 1 IoCs
  • Sets desktop wallpaper using registry 2 TTPs 1 IoCs
  • Suspicious use of SetThreadContext 3 IoCs
  • Drops file in Program Files directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Interacts with shadow copies 2 TTPs 1 IoCs

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

  • Modifies Internet Explorer settings 1 TTPs 3 IoCs
  • Modifies data under HKEY_USERS 20 IoCs
  • Suspicious behavior: EnumeratesProcesses 16 IoCs
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SendNotifyMessage 1 IoCs
  • Suspicious use of SetWindowsHookEx 5 IoCs
  • Suspicious use of UnmapMainImage 1 IoCs
  • Suspicious use of WriteProcessMemory 41 IoCs

Processes

  • C:\Windows\Explorer.EXE
    C:\Windows\Explorer.EXE
    1⤵
    • Sets desktop wallpaper using registry
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of UnmapMainImage
    PID:1400
    • C:\Users\Admin\AppData\Local\Temp\d6f34c4fb40c7f7cf66efbf0eb1bfd3a55089f65181d4d0c2de3c183f7527c79.exe
      "C:\Users\Admin\AppData\Local\Temp\d6f34c4fb40c7f7cf66efbf0eb1bfd3a55089f65181d4d0c2de3c183f7527c79.exe"
      2⤵
      • Suspicious use of SetThreadContext
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:1048
      • C:\Users\Admin\AppData\Local\Temp\d6f34c4fb40c7f7cf66efbf0eb1bfd3a55089f65181d4d0c2de3c183f7527c79.EXe
        "C:\Users\Admin\AppData\Local\Temp/d6f34c4fb40c7f7cf66efbf0eb1bfd3a55089f65181d4d0c2de3c183f7527c79.EXe"
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        PID:948
  • C:\Windows\system32\svchost.exe
    C:\Windows\system32\svchost.exe -k DcomLaunch
    1⤵
    • Modifies extensions of user files
    • Drops desktop.ini file(s)
    • Drops file in Program Files directory
    • Modifies data under HKEY_USERS
    • Suspicious use of WriteProcessMemory
    PID:592
    • C:\Windows\system32\DllHost.exe
      C:\Windows\system32\DllHost.exe /Processid:{AB8902B4-09CA-4BB6-B78D-A8F59079A8D5}
      2⤵
        PID:744
      • C:\Windows\system32\DllHost.exe
        C:\Windows\system32\DllHost.exe /Processid:{3EB3C877-1F16-487C-9050-104DBCD66683}
        2⤵
          PID:1952
      • C:\Windows\system32\taskeng.exe
        taskeng.exe {6BA5B8A4-ED58-4357-8B16-308408FF3003} S-1-5-18:NT AUTHORITY\System:Service:
        1⤵
        • Suspicious use of WriteProcessMemory
        PID:768
        • C:\Users\Admin\AppData\Local\Temp\pdfisga.exe
          C:\Users\Admin\AppData\Local\Temp\pdfisga.exe
          2⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of SetWindowsHookEx
          • Suspicious use of WriteProcessMemory
          PID:2020
          • C:\Users\Admin\AppData\Local\Temp\pdfisga.EXe
            "C:\Users\Admin\AppData\Local\Temp/pdfisga.EXe"
            3⤵
            • Executes dropped EXE
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of WriteProcessMemory
            PID:1464
            • C:\Windows\SysWOW64\vssadmin.exe
              vssadmin delete shadows all
              4⤵
              • Interacts with shadow copies
              PID:1924
            • C:\Users\Admin\AppData\Local\Temp\pdfisga.EXe
              "C:\Users\Admin\AppData\Local\Temp\pdfisga.EXe" -u
              4⤵
              • Executes dropped EXE
              • Suspicious use of SetThreadContext
              • Suspicious use of SetWindowsHookEx
              • Suspicious use of WriteProcessMemory
              PID:1184
              • C:\Users\Admin\AppData\Local\Temp\pdfisga.EXe
                "C:\Users\Admin\AppData\Local\Temp/pdfisga.EXe"
                5⤵
                • Executes dropped EXE
                • Checks computer location settings
                • Drops file in System32 directory
                • Modifies Internet Explorer settings
                • Suspicious use of FindShellTrayWindow
                • Suspicious use of SendNotifyMessage
                • Suspicious use of SetWindowsHookEx
                PID:2032

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            xptppml

            • Path C:\ProgramData\Mozilla\xptppml
            • Size 654B
            • SHA256 96ffd334aa66366b7bc393fdb538261574c7c488b89d7a445a203f31dfb5870a
            • MD5 SHA1 SHA512

            xptppml

            • Path C:\ProgramData\Mozilla\xptppml
            • Size 654B
            • SHA256 239d453a7600d593bd484986887b817a983d4fdc7b08a6ad1b03fab6499bbad6
            • MD5 SHA1 SHA512

            xptppml

            • Path C:\ProgramData\Mozilla\xptppml
            • Size 654B
            • SHA256 7c5babb11343d46eff1b34c5de6ae3fc7b6576590dd60393cbeee377b8f85bfe
            • MD5 SHA1 SHA512

            xptppml

            • Path C:\ProgramData\Mozilla\xptppml
            • Size 654B
            • SHA256 f7921d126aceb0a271ea7bf74051edf3016d43264f03392ec993e37fb0007a66
            • MD5 SHA1 SHA512

            zlwdkgg.html

            • Path C:\ProgramData\zlwdkgg.html
            • Size 62KB
            • SHA256 10878f586a5d4779b3f5f0be95a88da81b0775532cf8be9cd3fa3e3f17fa1bb4
            • MD5 SHA1 SHA512 SSDEEP

            pdfisga.exe

            • Path C:\Users\Admin\AppData\Local\Temp\pdfisga.exe
            • Size 954KB
            • SHA256 d6f34c4fb40c7f7cf66efbf0eb1bfd3a55089f65181d4d0c2de3c183f7527c79
            • MD5 SHA1 SHA512 SSDEEP

            pdfisga.exe

            • Path C:\Users\Admin\AppData\Local\Temp\pdfisga.exe
            • Size 954KB
            • SHA256 d6f34c4fb40c7f7cf66efbf0eb1bfd3a55089f65181d4d0c2de3c183f7527c79
            • MD5 SHA1 SHA512 SSDEEP

            pdfisga.exe

            • Path C:\Users\Admin\AppData\Local\Temp\pdfisga.exe
            • Size 954KB
            • SHA256 d6f34c4fb40c7f7cf66efbf0eb1bfd3a55089f65181d4d0c2de3c183f7527c79
            • MD5 SHA1 SHA512 SSDEEP

            pdfisga.exe

            • Path C:\Users\Admin\AppData\Local\Temp\pdfisga.exe
            • Size 954KB
            • SHA256 d6f34c4fb40c7f7cf66efbf0eb1bfd3a55089f65181d4d0c2de3c183f7527c79
            • MD5 SHA1 SHA512 SSDEEP

            pdfisga.exe

            • Path C:\Users\Admin\AppData\Local\Temp\pdfisga.exe
            • Size 954KB
            • SHA256 d6f34c4fb40c7f7cf66efbf0eb1bfd3a55089f65181d4d0c2de3c183f7527c79
            • MD5 SHA1 SHA512 SSDEEP

            memory/592-91-0x000007FEFBEE1000-0x000007FEFBEE3000-memory.dmp

            memory/592-87-0x00000000003E0000-0x0000000000457000-memory.dmp

            memory/592-85-0x00000000003E0000-0x0000000000457000-memory.dmp

            memory/948-67-0x00000000008E0000-0x0000000000B2B000-memory.dmp

            memory/948-56-0x0000000000400000-0x00000000004A5000-memory.dmp

            memory/948-57-0x0000000000400000-0x00000000004A5000-memory.dmp

            memory/948-64-0x00000000006C0000-0x00000000008DA000-memory.dmp

            memory/948-66-0x00000000759F1000-0x00000000759F3000-memory.dmp

            memory/948-68-0x0000000000400000-0x00000000004A4600-memory.dmp

            memory/948-60-0x0000000000400000-0x00000000004A5000-memory.dmp

            memory/1048-59-0x0000000000400000-0x000000000044C000-memory.dmp

            memory/1048-62-0x00000000029F0000-0x0000000002A3C000-memory.dmp

            memory/1048-65-0x0000000000400000-0x000000000044C000-memory.dmp

            memory/1184-108-0x0000000000400000-0x000000000044C000-memory.dmp

            memory/1464-84-0x00000000006D0000-0x000000000091B000-memory.dmp

            memory/2020-79-0x0000000000400000-0x000000000044C000-memory.dmp