Overview

overview

10

Static

static

10

8639825230...le.exe

windows7_x64

10

8639825230...le.exe

windows10_x64

10

Analysis

  • max time kernel
    138s
  • max time network
    143s
  • platform
    windows7_x64
  • resource
    win7v20210408
  • submitted
    26-07-2021 12:59

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General

  • Target

    8639825230d5504fd8126ed55b2d7aeb72944ffe17e762801aab8d4f8f880160.sample.exe

  • Size

    296KB

  • MD5

    258ed03a6e4d9012f8102c635a5e3dcd

  • SHA1

    a3bc2a30318f9bd2b51cb57e2022996e7f15c69e

  • SHA256

    8639825230d5504fd8126ed55b2d7aeb72944ffe17e762801aab8d4f8f880160

  • SHA512

    967414274cb8d8fdf0e4dd446332b37060d54a726ab77f4ec704a5afe12162e098183add4342d1710db1e1c3b74035a001cf4c2d7790a27bf6d8381c34a96889

Score
10/10
netwalkerransomwarespywarestealer

Malware Config

Extracted

Path

C:\ProgramData\Package Cache\{ca67548a-5ebe-413a-b50c-4b9ceb6d66c6}\F8999B-Readme.txt

Family

netwalker

Ransom Note
Hi! Your files are encrypted by Netwalker. All encrypted files for this computer has extension: .f8999b -- 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_f8999b: yXiiz+Bg9mkAil/kZuFwIKgvfsUPuZUXG0gbLXIkPB43CWYhUk wrTY6R+FQFBNN7CutLRghn6kGV3DlPTppbFLaNiaup/vAc41Zj ArwiL8q+up/RE7Mv+DxQVI62uAOGc0vfNhGT5tStpt6eqNKFbd Av926ACkkMLoP2+mVhH227O5G2LNzhhfw5c1KIZlrNNrDIIGYY xZ4jlWU8Gmy/hcIQ3k2zCduRujhTUsBsWJN6eFU+UXN0G1HiIK iptlgRQapXeUQ2GHKd/yGzN112KUC3Wh3RceMKKg==}
URLs

http://rnfdsgm6wb6j6su5txkekw4u4y47kp2eatvu7d6xhyn5cs4lt4pdrqqd.onion

Extracted

Path

C:\Program Files (x86)\Microsoft Office\Office14\PUBWIZ\F8999B-Readme.txt

Family

netwalker

Ransom Note
Hi! Your files are encrypted by Netwalker. All encrypted files for this computer has extension: .f8999b -- 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_f8999b: yXiiz+Bg9mkAil/kZuFwIKgvfsUPuZUXG0gbLXIkPB43CWYhUk wrTY6R+FQFBNN7CutLRghn6kGV3DlPTppbFLaNiaup/vAc41Zj ArwiL8q+up/RE7Mv+DxQVI62uAOGc0vfNhGT5tStpt6eqNKFbd Av926ACkkMLoP2+mVhH227O5G2LNzhhfw5c1KIZlrNNrDIIGYY xZ4jlWU8Gmy/hcIQ3k2zCduRujhTUsBsWJN6eFU+UXN0G1HiIK iptlgRQapXeUQ2GHKd/yGzN112KUC3Wh3RceMKKg==}Hi! Your files are encrypted by Netwalker. All encrypted files for this computer has extension: .f8999b -- 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_f8999b: yXiiz+Bg9mkAil/kZuFwIKgvfsUPuZUXG0gbLXIkPB43CWYhUk wrTY6R+FQFBNN7CutLRghn6kGV3DlPTppbFLaNiaup/vAc41Zj ArwiL8q+up/RE7Mv+DxQVI62uAOGc0vfNhGT5tStpt6eqNKFbd Av926ACkkMLoP2+mVhH227O5G2LNzhhfw5c1KIZlrNNrDIIGYY xZ4jlWU8Gmy/hcIQ3k2zCduRujhTUsBsWJN6eFU+UXN0G1HiIK iptlgRQapXeUQ2GHKd/yGzN112KUC3Wh3RceMKKg==}
URLs

http://rnfdsgm6wb6j6su5txkekw4u4y47kp2eatvu7d6xhyn5cs4lt4pdrqqd.onion

Extracted

Path

C:\Users\Admin\Desktop\F8999B-Readme.txt

Family

netwalker

Ransom Note
Hi! Your files are encrypted by Netwalker. All encrypted files for this computer has extension: .f8999b -- 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_f8999b: yXiiz+Bg9mkAil/kZuFwIKgvfsUPuZUXG0gbLXIkPB43CWYhUk wrTY6R+FQFBNN7CutLRghn6kGV3DlPTppbFLaNiaup/vAc41Zj ArwiL8q+up/RE7Mv+DxQVI62uAOGc0vfNhGT5tStpt6eqNKFbd Av926ACkkMLoP2+mVhH227O5G2LNzhhfw5c1KIZlrNNrDIIGYY xZ4jlWU8Gmy/hcIQ3k2zCduRujhTUsBsWJN6eFU+UXN0G1HiIK iptlgRQapXeUQ2GHKd/yGzN112KUC3Wh3RceMKKg==}Hi! Your files are encrypted by Netwalker. All encrypted files for this computer has extension: .f8999b -- 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_f8999b: yXiiz+Bg9mkAil/kZuFwIKgvfsUPuZUXG0gbLXIkPB43CWYhUk wrTY6R+FQFBNN7CutLRghn6kGV3DlPTppbFLaNiaup/vAc41Zj ArwiL8q+up/RE7Mv+DxQVI62uAOGc0vfNhGT5tStpt6eqNKFbd Av926ACkkMLoP2+mVhH227O5G2LNzhhfw5c1KIZlrNNrDIIGYY xZ4jlWU8Gmy/hcIQ3k2zCduRujhTUsBsWJN6eFU+UXN0G1HiIK iptlgRQapXeUQ2GHKd/yGzN112KUC3Wh3RceMKKg==}Hi! Your files are encrypted by Netwalker. All encrypted files for this computer has extension: .f8999b -- 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_f8999b: yXiiz+Bg9mkAil/kZuFwIKgvfsUPuZUXG0gbLXIkPB43CWYhUk wrTY6R+FQFBNN7CutLRghn6kGV3DlPTppbFLaNiaup/vAc41Zj ArwiL8q+up/RE7Mv+DxQVI62uAOGc0vfNhGT5tStpt6eqNKFbd Av926ACkkMLoP2+mVhH227O5G2LNzhhfw5c1KIZlrNNrDIIGYY xZ4jlWU8Gmy/hcIQ3k2zCduRujhTUsBsWJN6eFU+UXN0G1HiIK iptlgRQapXeUQ2GHKd/yGzN112KUC3Wh3RceMKKg==}
URLs

http://rnfdsgm6wb6j6su5txkekw4u4y47kp2eatvu7d6xhyn5cs4lt4pdrqqd.onion

Signatures

  • Detected Netwalker Ransomware 1 IoCs

    Detected unpacked Netwalker executable.

  • Netwalker Ransomware

    Ransomware family with multiple versions. Also known as MailTo.

    ransomwarenetwalker
  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

    ransomware
  • Modifies extensions of user files 4 IoCs

    Ransomware generally changes the extension on encrypted files.

    ransomware
  • 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.

    spywarestealer
  • 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.

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\8639825230d5504fd8126ed55b2d7aeb72944ffe17e762801aab8d4f8f880160.sample.exe
    "C:\Users\Admin\AppData\Local\Temp\8639825230d5504fd8126ed55b2d7aeb72944ffe17e762801aab8d4f8f880160.sample.exe"
    1⤵
    • Modifies extensions of user files
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1288
    • C:\Windows\system32\vssadmin.exe
      C:\Windows\system32\vssadmin.exe delete shadows /all /quiet
      2⤵
      • Interacts with shadow copies
      PID:1988
    • C:\Windows\SysWOW64\notepad.exe
      C:\Windows\system32\notepad.exe "C:\Users\Admin\Desktop\F8999B-Readme.txt"
      2⤵
        PID:1100
      • C:\Windows\SysWOW64\cmd.exe
        cmd /c "C:\Users\Admin\AppData\Local\Temp\ABAA.tmp.bat"
        2⤵
        • Deletes itself
        • Suspicious use of WriteProcessMemory
        PID:4408
        • C:\Windows\SysWOW64\taskkill.exe
          taskkill /F /PID 1288
          3⤵
          • Kills process with taskkill
          • Suspicious use of AdjustPrivilegeToken
          PID:4324
    • C:\Windows\system32\vssvc.exe
      C:\Windows\system32\vssvc.exe
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:6044

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

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    Downloads

    • memory/1288-60-0x00000000750C1000-0x00000000750C3000-memory.dmp

      Filesize

      8KB

      Download

    • memory/1288-61-0x0000000000220000-0x0000000000246000-memory.dmp

      Filesize

      152KB

      Download

    • memory/1288-62-0x0000000000400000-0x000000000044B000-memory.dmp

      Filesize

      300KB

      Download