Analysis

  • max time kernel
    91s
  • max time network
    94s
  • platform
    windows7_x64
  • resource
    win7v20210410
  • submitted
    01-07-2021 04:38

General

  • Target

    9a9bf626d4a3e9afe613f7eaa347acac600de2aecc45a5706aa2ba386625eed6.exe

  • Size

    66KB

  • MD5

    5e7d419747ee589f724a80d9ac8b7186

  • SHA1

    b91e9178b054811312c83f3d81cc4153d2fa38ba

  • SHA256

    9a9bf626d4a3e9afe613f7eaa347acac600de2aecc45a5706aa2ba386625eed6

  • SHA512

    bdd91c5551df4a3adbe56ebcf2045cad1ed924627c16236ef7579ee73974c3d784a0fc2624ecb143912315231c9565854294d021d01549f61140efe1ec2b6c23

Malware Config

Extracted

Path

C:\F43E65-Readme.txt

Family

netwalker

Ransom Note Hi! Your files are encrypted by Netwalker. All encrypted files for this computer has extension: .f43e65 -- If for some reason you read this text before the encryption ended, this can be understood by the fact that the computer slows down, and your heart rate has increased due to the ability to turn it off, then we recommend that you move away from the computer and accept that you have been compromised. Rebooting/shutdown will cause you to lose files without the possibility of recovery. -- Our encryption algorithms are very strong and your files are very well protected, the only way to get your files back is to cooperate with us and get the decrypter program. Do not try to recover your files without a decrypter program, you may damage them and then they will be impossible to recover. For us this is just business and to prove to you our seriousness, we will decrypt you one file for free. Just open our website, upload the encrypted file and get the decrypted file for free. -- Steps to get access on our website: 1.Download and install tor-browser: https://torproject.org/ 2.Open our website: rnfdsgm6wb6j6su5txkekw4u4y47kp2eatvu7d6xhyn5cs4lt4pdrqqd.onion 3.Put your personal code in the input form: {code_f43e65: tFP0GSPudA3wtSInAhscvfzXvpX+8l2ijkOL436d3tzEe10FjP SVcGJfsY0ZiP4PzLUEDVdW1wZrykXNUE35iuIGga5wkVoW41Zj ArOjnCI4pLwFkRozDKvyJlBLfroH/ys0CblD0uaY5H3xze4CUd vRlHUDGSOodkUK0pbNjgHm0u2isc40hOk80O4cN0JorA+qzsgb Jgo+i8ncEYB4pVRVYf6vODuPONo2DANhMT9I3Vhuohs2d/TXA/ quUK7xZ8FT7TuCvYxC6E3toGAYAPfnBJuugw4rlA==}
URLs

http://rnfdsgm6wb6j6su5txkekw4u4y47kp2eatvu7d6xhyn5cs4lt4pdrqqd.onion

Extracted

Path

C:\Users\Admin\Favorites\Microsoft Websites\F43E65-Readme.txt

Family

netwalker

Ransom Note Hi! Your files are encrypted by Netwalker. All encrypted files for this computer has extension: .f43e65 -- If for some reason you read this text before the encryption ended, this can be understood by the fact that the computer slows down, and your heart rate has increased due to the ability to turn it off, then we recommend that you move away from the computer and accept that you have been compromised. Rebooting/shutdown will cause you to lose files without the possibility of recovery. -- Our encryption algorithms are very strong and your files are very well protected, the only way to get your files back is to cooperate with us and get the decrypter program. Do not try to recover your files without a decrypter program, you may damage them and then they will be impossible to recover. For us this is just business and to prove to you our seriousness, we will decrypt you one file for free. Just open our website, upload the encrypted file and get the decrypted file for free. -- Steps to get access on our website: 1.Download and install tor-browser: https://torproject.org/ 2.Open our website: rnfdsgm6wb6j6su5txkekw4u4y47kp2eatvu7d6xhyn5cs4lt4pdrqqd.onion 3.Put your personal code in the input form: {code_f43e65: tFP0GSPudA3wtSInAhscvfzXvpX+8l2ijkOL436d3tzEe10FjP SVcGJfsY0ZiP4PzLUEDVdW1wZrykXNUE35iuIGga5wkVoW41Zj ArOjnCI4pLwFkRozDKvyJlBLfroH/ys0CblD0uaY5H3xze4CUd vRlHUDGSOodkUK0pbNjgHm0u2isc40hOk80O4cN0JorA+qzsgb Jgo+i8ncEYB4pVRVYf6vODuPONo2DANhMT9I3Vhuohs2d/TXA/ quUK7xZ8FT7TuCvYxC6E3toGAYAPfnBJuugw4rlA==}Hi! Your files are encrypted by Netwalker. All encrypted files for this computer has extension: .f43e65 -- If for some reason you read this text before the encryption ended, this can be understood by the fact that the computer slows down, and your heart rate has increased due to the ability to turn it off, then we recommend that you move away from the computer and accept that you have been compromised. Rebooting/shutdown will cause you to lose files without the possibility of recovery. -- Our encryption algorithms are very strong and your files are very well protected, the only way to get your files back is to cooperate with us and get the decrypter program. Do not try to recover your files without a decrypter program, you may damage them and then they will be impossible to recover. For us this is just business and to prove to you our seriousness, we will decrypt you one file for free. Just open our website, upload the encrypted file and get the decrypted file for free. -- Steps to get access on our website: 1.Download and install tor-browser: https://torproject.org/ 2.Open our website: rnfdsgm6wb6j6su5txkekw4u4y47kp2eatvu7d6xhyn5cs4lt4pdrqqd.onion 3.Put your personal code in the input form: {code_f43e65: tFP0GSPudA3wtSInAhscvfzXvpX+8l2ijkOL436d3tzEe10FjP SVcGJfsY0ZiP4PzLUEDVdW1wZrykXNUE35iuIGga5wkVoW41Zj ArOjnCI4pLwFkRozDKvyJlBLfroH/ys0CblD0uaY5H3xze4CUd vRlHUDGSOodkUK0pbNjgHm0u2isc40hOk80O4cN0JorA+qzsgb Jgo+i8ncEYB4pVRVYf6vODuPONo2DANhMT9I3Vhuohs2d/TXA/ quUK7xZ8FT7TuCvYxC6E3toGAYAPfnBJuugw4rlA==}
URLs

http://rnfdsgm6wb6j6su5txkekw4u4y47kp2eatvu7d6xhyn5cs4lt4pdrqqd.onion

Extracted

Path

C:\Program Files (x86)\Microsoft Office\Office14\1033\PUBFTSCM\F43E65-Readme.txt

Family

netwalker

Ransom Note Hi! Your files are encrypted by Netwalker. All encrypted files for this computer has extension: .f43e65 -- If for some reason you read this text before the encryption ended, this can be understood by the fact that the computer slows down, and your heart rate has increased due to the ability to turn it off, then we recommend that you move away from the computer and accept that you have been compromised. Rebooting/shutdown will cause you to lose files without the possibility of recovery. -- Our encryption algorithms are very strong and your files are very well protected, the only way to get your files back is to cooperate with us and get the decrypter program. Do not try to recover your files without a decrypter program, you may damage them and then they will be impossible to recover. For us this is just business and to prove to you our seriousness, we will decrypt you one file for free. Just open our website, upload the encrypted file and get the decrypted file for free. -- Steps to get access on our website: 1.Download and install tor-browser: https://torproject.org/ 2.Open our website: rnfdsgm6wb6j6su5txkekw4u4y47kp2eatvu7d6xhyn5cs4lt4pdrqqd.onion 3.Put your personal code in the input form: {code_f43e65: tFP0GSPudA3wtSInAhscvfzXvpX+8l2ijkOL436d3tzEe10FjP SVcGJfsY0ZiP4PzLUEDVdW1wZrykXNUE35iuIGga5wkVoW41Zj ArOjnCI4pLwFkRozDKvyJlBLfroH/ys0CblD0uaY5H3xze4CUd vRlHUDGSOodkUK0pbNjgHm0u2isc40hOk80O4cN0JorA+qzsgb Jgo+i8ncEYB4pVRVYf6vODuPONo2DANhMT9I3Vhuohs2d/TXA/ quUK7xZ8FT7TuCvYxC6E3toGAYAPfnBJuugw4rlA==}Hi! Your files are encrypted by Netwalker. All encrypted files for this computer has extension: .f43e65 -- If for some reason you read this text before the encryption ended, this can be understood by the fact that the computer slows down, and your heart rate has increased due to the ability to turn it off, then we recommend that you move away from the computer and accept that you have been compromised. Rebooting/shutdown will cause you to lose files without the possibility of recovery. -- Our encryption algorithms are very strong and your files are very well protected, the only way to get your files back is to cooperate with us and get the decrypter program. Do not try to recover your files without a decrypter program, you may damage them and then they will be impossible to recover. For us this is just business and to prove to you our seriousness, we will decrypt you one file for free. Just open our website, upload the encrypted file and get the decrypted file for free. -- Steps to get access on our website: 1.Download and install tor-browser: https://torproject.org/ 2.Open our website: rnfdsgm6wb6j6su5txkekw4u4y47kp2eatvu7d6xhyn5cs4lt4pdrqqd.onion 3.Put your personal code in the input form: {code_f43e65: tFP0GSPudA3wtSInAhscvfzXvpX+8l2ijkOL436d3tzEe10FjP SVcGJfsY0ZiP4PzLUEDVdW1wZrykXNUE35iuIGga5wkVoW41Zj ArOjnCI4pLwFkRozDKvyJlBLfroH/ys0CblD0uaY5H3xze4CUd vRlHUDGSOodkUK0pbNjgHm0u2isc40hOk80O4cN0JorA+qzsgb Jgo+i8ncEYB4pVRVYf6vODuPONo2DANhMT9I3Vhuohs2d/TXA/ quUK7xZ8FT7TuCvYxC6E3toGAYAPfnBJuugw4rlA==}Hi! Your files are encrypted by Netwalker. All encrypted files for this computer has extension: .f43e65 -- If for some reason you read this text before the encryption ended, this can be understood by the fact that the computer slows down, and your heart rate has increased due to the ability to turn it off, then we recommend that you move away from the computer and accept that you have been compromised. Rebooting/shutdown will cause you to lose files without the possibility of recovery. -- Our encryption algorithms are very strong and your files are very well protected, the only way to get your files back is to cooperate with us and get the decrypter program. Do not try to recover your files without a decrypter program, you may damage them and then they will be impossible to recover. For us this is just business and to prove to you our seriousness, we will decrypt you one file for free. Just open our website, upload the encrypted file and get the decrypted file for free. -- Steps to get access on our website: 1.Download and install tor-browser: https://torproject.org/ 2.Open our website: rnfdsgm6wb6j6su5txkekw4u4y47kp2eatvu7d6xhyn5cs4lt4pdrqqd.onion 3.Put your personal code in the input form: {code_f43e65: tFP0GSPudA3wtSInAhscvfzXvpX+8l2ijkOL436d3tzEe10FjP SVcGJfsY0ZiP4PzLUEDVdW1wZrykXNUE35iuIGga5wkVoW41Zj ArOjnCI4pLwFkRozDKvyJlBLfroH/ys0CblD0uaY5H3xze4CUd vRlHUDGSOodkUK0pbNjgHm0u2isc40hOk80O4cN0JorA+qzsgb Jgo+i8ncEYB4pVRVYf6vODuPONo2DANhMT9I3Vhuohs2d/TXA/ quUK7xZ8FT7TuCvYxC6E3toGAYAPfnBJuugw4rlA==}
URLs

http://rnfdsgm6wb6j6su5txkekw4u4y47kp2eatvu7d6xhyn5cs4lt4pdrqqd.onion

Signatures

  • Netwalker Ransomware

    Ransomware family with multiple versions. Also known as MailTo.

  • Deletes shadow copies ⋅ 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Modifies extensions of user files ⋅ 4 IoCs

    Ransomware generally changes the extension on encrypted files.

  • Deletes itself ⋅ 1 IoCs
  • Reads user/profile data of web browsers ⋅ 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Drops file in Program Files directory ⋅ 64 IoCs
  • Interacts with shadow copies ⋅ 2 TTPs 1 IoCs

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

  • Kills process with taskkill ⋅ 1 IoCs
  • Suspicious behavior: EnumeratesProcesses ⋅ 64 IoCs
  • Suspicious use of AdjustPrivilegeToken ⋅ 6 IoCs
  • Suspicious use of WriteProcessMemory ⋅ 16 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\9a9bf626d4a3e9afe613f7eaa347acac600de2aecc45a5706aa2ba386625eed6.exe
    "C:\Users\Admin\AppData\Local\Temp\9a9bf626d4a3e9afe613f7eaa347acac600de2aecc45a5706aa2ba386625eed6.exe"
    Modifies extensions of user files
    Drops file in Program Files directory
    Suspicious behavior: EnumeratesProcesses
    Suspicious use of AdjustPrivilegeToken
    Suspicious use of WriteProcessMemory
    PID:1964
    • C:\Windows\system32\vssadmin.exe
      C:\Windows\system32\vssadmin.exe delete shadows /all /quiet
      Interacts with shadow copies
      PID:2008
    • C:\Windows\SysWOW64\notepad.exe
      C:\Windows\system32\notepad.exe "C:\Users\Admin\Desktop\F43E65-Readme.txt"
      PID:4708
    • C:\Windows\SysWOW64\cmd.exe
      cmd /c "C:\Users\Admin\AppData\Local\Temp\EABC.tmp.bat"
      Deletes itself
      Suspicious use of WriteProcessMemory
      PID:5856
      • C:\Windows\SysWOW64\taskkill.exe
        taskkill /F /PID 1964
        Kills process with taskkill
        Suspicious use of AdjustPrivilegeToken
        PID:5004
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    Suspicious use of AdjustPrivilegeToken
    PID:2608

Network

MITRE ATT&CK Matrix

Command and Control

    Credential Access

    Defense Evasion

    Discovery

      Execution

        Exfiltration

          Initial Access

            Lateral Movement

              Persistence

                Privilege Escalation

                  Replay Monitor

                  00:00 00:00

                  Downloads

                  • C:\Users\Admin\AppData\Local\Temp\EABC.tmp.bat
                    MD5

                    18230297dbba850a25b6dc479641097c

                    SHA1

                    b4787b6085c0ce58c2a7a80f7c92f60b840d738d

                    SHA256

                    4596e48e3659998eac5775ea2cac992168ee92e9fbfc141f249e1240a83f3447

                    SHA512

                    bd9564aa127259b4dd9e3668d4982065dbc86085a7d51e6d374193c6ca76222fa329d97d2f2808a324384b4b66e469600d602761e4987576a5bb410b3cbc94fd

                  • C:\Users\Admin\Desktop\F43E65-Readme.txt
                    MD5

                    555dd1aa2511e069d0ae620724a106ec

                    SHA1

                    5acc903c191b8cf63f5f960d154dc290da5e24d3

                    SHA256

                    5e4025cf29fdb7cc6104e51701e6894397619af51581ccdc3d722954615d6b44

                    SHA512

                    543743141b64cec0c4cca4cfd355c947cecf9d58655e98ee0fe5563ad45b442d932d13e026fe5877c926e6c29d5e1ce46ed07a79bbaae419ab52f77a0afcb01a

                  • memory/1964-59-0x0000000076A81000-0x0000000076A83000-memory.dmp
                  • memory/2008-60-0x0000000000000000-mapping.dmp
                  • memory/4708-61-0x0000000000000000-mapping.dmp
                  • memory/5004-65-0x0000000000000000-mapping.dmp
                  • memory/5856-63-0x0000000000000000-mapping.dmp