Analysis

  • max time kernel
    151s
  • max time network
    43s
  • platform
    windows7_x64
  • resource
    win7v20210408
  • submitted
    26-07-2021 12:57

General

  • Target

    88ae30e10e2db871b9f5f986837c184a386ed58805fb066effed90f4619ec46e.sample.exe

  • Size

    654KB

  • MD5

    2452df8493c85994e7fe0f42e664999e

  • SHA1

    0ed37c982134aa703837f38bea0549e70c29bccb

  • SHA256

    88ae30e10e2db871b9f5f986837c184a386ed58805fb066effed90f4619ec46e

  • SHA512

    132ff8871e8fac09512760766c8c4dd25ee9bfd695885354e64f02dd6d3615f621f34c3e410b5ac981181ca7635608367b72e60d5422f96d1d907ed926cb80bb

Score
10/10

Malware Config

Extracted

Path

C:\Program Files (x86)\Microsoft Office\CLIPART\PUB60COR\!Decrypt-All-Files-tixksrn.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://jssestaew3e7ao3q.onion.cab or http://jssestaew3e7ao3q.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://jssestaew3e7ao3q.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. WZIEFFP-UZSWJ46-MXEJKAE-V7KDE6A-QEYRAVG-ZEYDM57-LBJCJQY-6M4CLIU CPG6TD6-JDMQ4VD-A72HULJ-H6HAEXE-KVDKOGE-OB63HCX-T4G5CYZ-GM6VPOC 7KSAZSZ-JWVSBC3-GQ2DN4R-PVKUL2Y-LA7OKWF-WZEXW6A-4CIB4BY-QUAZBMY Follow the instructions on the server.
URLs

http://jssestaew3e7ao3q.onion.cab

http://jssestaew3e7ao3q.tor2web.org

http://jssestaew3e7ao3q.onion/

Extracted

Path

C:\Users\Admin\Documents\!Decrypt-All-Files-tixksrn.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://jssestaew3e7ao3q.onion.cab or http://jssestaew3e7ao3q.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://jssestaew3e7ao3q.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. WZIEFFP-UZSWJ46-MXEJKAE-V7KDE6A-QEYRAVG-ZEYDM57-LBJCJQY-6M4CLIU CPG6TD6-JDMQ4VD-A72HULJ-H6HAEXE-KVDKOGE-OB63HCX-T4G5CYZ-GM6VPOC 7KSAZSZ-JWVSBC3-GQ2DN4R-PVKUL2Y-LA7OREF-YCEXW6A-4CIB4BY-QUAZ6QV Follow the instructions on the server.
URLs

http://jssestaew3e7ao3q.onion.cab

http://jssestaew3e7ao3q.tor2web.org

http://jssestaew3e7ao3q.onion/

Extracted

Path

C:\ProgramData\sctpnha.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://jssestaew3e7ao3q.onion.cab or http://jssestaew3e7ao3q.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://jssestaew3e7ao3q.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://jssestaew3e7ao3q.onion.cab

http://jssestaew3e7ao3q.tor2web.org

http://jssestaew3e7ao3q.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 2 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
  • 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 14 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 7 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SendNotifyMessage 1 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 20 IoCs

Processes

  • 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:584
    • C:\Windows\system32\DllHost.exe
      C:\Windows\system32\DllHost.exe /Processid:{AB8902B4-09CA-4BB6-B78D-A8F59079A8D5}
      2⤵
        PID:928
      • C:\Windows\system32\DllHost.exe
        C:\Windows\system32\DllHost.exe /Processid:{3EB3C877-1F16-487C-9050-104DBCD66683}
        2⤵
          PID:1240
      • C:\Windows\Explorer.EXE
        C:\Windows\Explorer.EXE
        1⤵
        • Sets desktop wallpaper using registry
        • Suspicious behavior: GetForegroundWindowSpam
        • Suspicious use of AdjustPrivilegeToken
        PID:1352
        • C:\Users\Admin\AppData\Local\Temp\88ae30e10e2db871b9f5f986837c184a386ed58805fb066effed90f4619ec46e.sample.exe
          "C:\Users\Admin\AppData\Local\Temp\88ae30e10e2db871b9f5f986837c184a386ed58805fb066effed90f4619ec46e.sample.exe"
          2⤵
          • Suspicious behavior: EnumeratesProcesses
          PID:1972
      • C:\Windows\system32\taskeng.exe
        taskeng.exe {AE5E5EE5-E5B7-40A9-8F55-1D91AE8E4012} S-1-5-18:NT AUTHORITY\System:Service:
        1⤵
        • Suspicious use of WriteProcessMemory
        PID:832
        • C:\Users\Admin\AppData\Local\Temp\sdfkjhe.exe
          C:\Users\Admin\AppData\Local\Temp\sdfkjhe.exe
          2⤵
          • Executes dropped EXE
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:1664
          • C:\Windows\SysWOW64\vssadmin.exe
            vssadmin delete shadows all
            3⤵
            • Interacts with shadow copies
            PID:756
          • C:\Users\Admin\AppData\Local\Temp\sdfkjhe.exe
            "C:\Users\Admin\AppData\Local\Temp\sdfkjhe.exe" -u
            3⤵
            • 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:1536
      • C:\Windows\system32\AUDIODG.EXE
        C:\Windows\system32\AUDIODG.EXE 0x220
        1⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:1228

      Network

      MITRE ATT&CK Matrix ATT&CK v6

      Defense Evasion

      File Deletion

      2
      T1107

      Modify Registry

      2
      T1112

      Discovery

      Query Registry

      1
      T1012

      System Information Discovery

      2
      T1082

      Impact

      Inhibit System Recovery

      2
      T1490

      Defacement

      1
      T1491

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\ProgramData\Microsoft Help\retmfqf
        MD5

        131163676e8a6bcef5b3b3498c7571a8

        SHA1

        d7496acbfdb7dc0aab9dea2010474d47a32c4e53

        SHA256

        cdbcf04e52ed123c0a06208e6e475673697604e432690d68cb259c99f633c449

        SHA512

        38b7f97e387b45cf28cd238fad29f91d22fe6097e932ff7bd367a81015e26bed863b840ad1771213de6a63459d2caefa21165eec7c1b548907d53c65d44d1314

      • C:\ProgramData\Microsoft Help\retmfqf
        MD5

        131163676e8a6bcef5b3b3498c7571a8

        SHA1

        d7496acbfdb7dc0aab9dea2010474d47a32c4e53

        SHA256

        cdbcf04e52ed123c0a06208e6e475673697604e432690d68cb259c99f633c449

        SHA512

        38b7f97e387b45cf28cd238fad29f91d22fe6097e932ff7bd367a81015e26bed863b840ad1771213de6a63459d2caefa21165eec7c1b548907d53c65d44d1314

      • C:\ProgramData\Microsoft Help\retmfqf
        MD5

        8291f1544199cfa53fb2d9c0dc6e81a8

        SHA1

        2cf09f4488841419c97fdcb3cb6a567715fff2af

        SHA256

        c5cb2792960bef3c280afb22f489c0d7d5b0785f6c8329dc8e1dbae9cc701b26

        SHA512

        939191ebb60bdad7a75663a9a37c86e385cf609b898b29d59549323917ff95f307871033869defb917d2663ef97219674192e008ce987eb983fc49957c884482

      • C:\ProgramData\Microsoft Help\retmfqf
        MD5

        8291f1544199cfa53fb2d9c0dc6e81a8

        SHA1

        2cf09f4488841419c97fdcb3cb6a567715fff2af

        SHA256

        c5cb2792960bef3c280afb22f489c0d7d5b0785f6c8329dc8e1dbae9cc701b26

        SHA512

        939191ebb60bdad7a75663a9a37c86e385cf609b898b29d59549323917ff95f307871033869defb917d2663ef97219674192e008ce987eb983fc49957c884482

      • C:\ProgramData\sctpnha.html
        MD5

        35a84d47704ec85c8ca6374692b57c5a

        SHA1

        259f5d122055ef77ddbe072118c23af8e163d747

        SHA256

        14cfb801c0038568373722117706be032360bc9b9fd1c91bbca144f31af522be

        SHA512

        3e212ea34e45e96cd9242c18b7a86b140b128e2e0bc32bcc041f514ef97320ebff16fadcd58fe29da56724937abd2e439b54d206f3b245312655477269dee846

      • C:\Users\Admin\AppData\Local\Temp\sdfkjhe.exe
        MD5

        2452df8493c85994e7fe0f42e664999e

        SHA1

        0ed37c982134aa703837f38bea0549e70c29bccb

        SHA256

        88ae30e10e2db871b9f5f986837c184a386ed58805fb066effed90f4619ec46e

        SHA512

        132ff8871e8fac09512760766c8c4dd25ee9bfd695885354e64f02dd6d3615f621f34c3e410b5ac981181ca7635608367b72e60d5422f96d1d907ed926cb80bb

      • C:\Users\Admin\AppData\Local\Temp\sdfkjhe.exe
        MD5

        2452df8493c85994e7fe0f42e664999e

        SHA1

        0ed37c982134aa703837f38bea0549e70c29bccb

        SHA256

        88ae30e10e2db871b9f5f986837c184a386ed58805fb066effed90f4619ec46e

        SHA512

        132ff8871e8fac09512760766c8c4dd25ee9bfd695885354e64f02dd6d3615f621f34c3e410b5ac981181ca7635608367b72e60d5422f96d1d907ed926cb80bb

      • C:\Users\Admin\AppData\Local\Temp\sdfkjhe.exe
        MD5

        2452df8493c85994e7fe0f42e664999e

        SHA1

        0ed37c982134aa703837f38bea0549e70c29bccb

        SHA256

        88ae30e10e2db871b9f5f986837c184a386ed58805fb066effed90f4619ec46e

        SHA512

        132ff8871e8fac09512760766c8c4dd25ee9bfd695885354e64f02dd6d3615f621f34c3e410b5ac981181ca7635608367b72e60d5422f96d1d907ed926cb80bb

      • memory/584-69-0x00000000003D0000-0x0000000000447000-memory.dmp
        Filesize

        476KB

      • memory/584-73-0x000007FEFC1D1000-0x000007FEFC1D3000-memory.dmp
        Filesize

        8KB

      • memory/756-77-0x0000000000000000-mapping.dmp
      • memory/928-72-0x0000000000000000-mapping.dmp
      • memory/1240-85-0x0000000000000000-mapping.dmp
      • memory/1536-78-0x0000000000000000-mapping.dmp
      • memory/1536-82-0x00000000006A0000-0x00000000008EB000-memory.dmp
        Filesize

        2.3MB

      • memory/1536-83-0x00000000000A0000-0x00000000000A1000-memory.dmp
        Filesize

        4KB

      • memory/1664-68-0x0000000000AC0000-0x0000000000D0B000-memory.dmp
        Filesize

        2.3MB

      • memory/1664-64-0x0000000000000000-mapping.dmp
      • memory/1972-60-0x00000000005E0000-0x00000000007FA000-memory.dmp
        Filesize

        2.1MB

      • memory/1972-62-0x0000000000800000-0x0000000000A4B000-memory.dmp
        Filesize

        2.3MB

      • memory/1972-61-0x0000000075DA1000-0x0000000075DA3000-memory.dmp
        Filesize

        8KB