Analysis

  • max time kernel
    119s
  • max time network
    42s
  • platform
    windows7_x64
  • resource
    win7v20201028
  • submitted
    09-11-2020 20:17

General

  • Target

    c21ecd18f0bbb28112240013ad42dad5c01d20927791239ada5b61e1c6f5f010.bin.exe

  • Size

    69KB

  • MD5

    608ac26ea80c189ed8e0f62dd4fd8ada

  • SHA1

    c5b3fa421db00fe931f439af5df4f65f7f3d9a1a

  • SHA256

    c21ecd18f0bbb28112240013ad42dad5c01d20927791239ada5b61e1c6f5f010

  • SHA512

    57951e09485961814bf018b3a10b6ad2e68f76409bcfce509afb979eee3dc0010af891d0efa094c0510ff26b21812b2d9528cce2bbc362c9830ae00b1610c4ad

Malware Config

Extracted

Path

C:\9BD76B-Readme.txt

Ransom Note
Hello, O2MICRO. Your files are encrypted by Netwalker. All encrypted files for this computer has extension: .9bd76b -- 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. -- *** We have downloaded your documents, databases, documents of your customers, correspondence. We are ready to put everything in public access. Contact us in chat. *** -- Steps to get access on our website: 1.Download and install tor-browser: https://torproject.org/ 2.Open our website: pb36hu4spl6cyjdfhing7h3pw6dhpk32ifemawkujj4gp33ejzdq3did.onion If the website is not available, open another one: rnfdsgm6wb6j6su5txkekw4u4y47kp2eatvu7d6xhyn5cs4lt4pdrqqd.onion 3.Put your personal code in the input form: {code_9bd76b: xftJrjvCOLN0Oq8/d6OzUNtSOe3CPKzqH0vPNJd8UCfxBCPAr9 4Vz4VuIMlucqNORFnlBgYj4Sus1l7TWBhgDbh66rJeyoNmEXt0 VKtdbdblXiH6pgQFlbPayZ0s/7ygAPG61nRKYSpLLTrJ0kzunJ NkurF8yttN7SGK2S2NTBp93Z4oAcMOOnlFE6UhmQ7XtdbyA4GM JdxblWtoXpPMItalz7MID0PWnh4Hn1V0CCjqVTc2vO/AetHXws 0+GZS6RyNhzlY0dw0Zy9y2PBW/A1FHg2096h/1pA==}
URLs

http://pb36hu4spl6cyjdfhing7h3pw6dhpk32ifemawkujj4gp33ejzdq3did.onion

http://rnfdsgm6wb6j6su5txkekw4u4y47kp2eatvu7d6xhyn5cs4lt4pdrqqd.onion

Extracted

Path

C:\Program Files\9BD76B-Readme.txt

Ransom Note
Hello, O2MICRO. Your files are encrypted by Netwalker. All encrypted files for this computer has extension: .9bd76b -- 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. -- *** We have downloaded your documents, databases, documents of your customers, correspondence. We are ready to put everything in public access. Contact us in chat. *** -- Steps to get access on our website: 1.Download and install tor-browser: https://torproject.org/ 2.Open our website: pb36hu4spl6cyjdfhing7h3pw6dhpk32ifemawkujj4gp33ejzdq3did.onion If the website is not available, open another one: rnfdsgm6wb6j6su5txkekw4u4y47kp2eatvu7d6xhyn5cs4lt4pdrqqd.onion 3.Put your personal code in the input form: {code_9bd76b: xftJrjvCOLN0Oq8/d6OzUNtSOe3CPKzqH0vPNJd8UCfxBCPAr9 4Vz4VuIMlucqNORFnlBgYj4Sus1l7TWBhgDbh66rJeyoNmEXt0 VKtdbdblXiH6pgQFlbPayZ0s/7ygAPG61nRKYSpLLTrJ0kzunJ NkurF8yttN7SGK2S2NTBp93Z4oAcMOOnlFE6UhmQ7XtdbyA4GM JdxblWtoXpPMItalz7MID0PWnh4Hn1V0CCjqVTc2vO/AetHXws 0+GZS6RyNhzlY0dw0Zy9y2PBW/A1FHg2096h/1pA==}Hello, O2MICRO. Your files are encrypted by Netwalker. All encrypted files for this computer has extension: .9bd76b -- 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. -- *** We have downloaded your documents, databases, documents of your customers, correspondence. We are ready to put everything in public access. Contact us in chat. *** -- Steps to get access on our website: 1.Download and install tor-browser: https://torproject.org/ 2.Open our website: pb36hu4spl6cyjdfhing7h3pw6dhpk32ifemawkujj4gp33ejzdq3did.onion If the website is not available, open another one: rnfdsgm6wb6j6su5txkekw4u4y47kp2eatvu7d6xhyn5cs4lt4pdrqqd.onion 3.Put your personal code in the input form: {code_9bd76b: xftJrjvCOLN0Oq8/d6OzUNtSOe3CPKzqH0vPNJd8UCfxBCPAr9 4Vz4VuIMlucqNORFnlBgYj4Sus1l7TWBhgDbh66rJeyoNmEXt0 VKtdbdblXiH6pgQFlbPayZ0s/7ygAPG61nRKYSpLLTrJ0kzunJ NkurF8yttN7SGK2S2NTBp93Z4oAcMOOnlFE6UhmQ7XtdbyA4GM JdxblWtoXpPMItalz7MID0PWnh4Hn1V0CCjqVTc2vO/AetHXws 0+GZS6RyNhzlY0dw0Zy9y2PBW/A1FHg2096h/1pA==}
URLs

http://pb36hu4spl6cyjdfhing7h3pw6dhpk32ifemawkujj4gp33ejzdq3did.onion

http://rnfdsgm6wb6j6su5txkekw4u4y47kp2eatvu7d6xhyn5cs4lt4pdrqqd.onion

Signatures

  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Modifies extensions of user files 10 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.

  • Modifies service 2 TTPs 5 IoCs
  • Drops file in Program Files directory 7470 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 16721 IoCs
  • Suspicious use of AdjustPrivilegeToken 6 IoCs
  • Suspicious use of WriteProcessMemory 16 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\c21ecd18f0bbb28112240013ad42dad5c01d20927791239ada5b61e1c6f5f010.bin.exe
    "C:\Users\Admin\AppData\Local\Temp\c21ecd18f0bbb28112240013ad42dad5c01d20927791239ada5b61e1c6f5f010.bin.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:844
    • C:\Windows\system32\vssadmin.exe
      C:\Windows\system32\vssadmin.exe delete shadows /all /quiet
      2⤵
      • Interacts with shadow copies
      PID:2024
    • C:\Windows\SysWOW64\notepad.exe
      C:\Windows\system32\notepad.exe "C:\Users\Admin\Desktop\9BD76B-Readme.txt"
      2⤵
        PID:6868
      • C:\Windows\SysWOW64\cmd.exe
        cmd /c "C:\Users\Admin\AppData\Local\Temp\F038.tmp.bat"
        2⤵
        • Deletes itself
        • Suspicious use of WriteProcessMemory
        PID:6952
        • C:\Windows\SysWOW64\taskkill.exe
          taskkill /F /PID 844
          3⤵
          • Kills process with taskkill
          • Suspicious use of AdjustPrivilegeToken
          PID:568
    • C:\Windows\system32\vssvc.exe
      C:\Windows\system32\vssvc.exe
      1⤵
      • Modifies service
      • Suspicious use of AdjustPrivilegeToken
      PID:2612

    Network

    MITRE ATT&CK Matrix ATT&CK v6

    Persistence

    Modify Existing Service

    1
    T1031

    Defense Evasion

    File Deletion

    2
    T1107

    Modify Registry

    1
    T1112

    Credential Access

    Credentials in Files

    1
    T1081

    Collection

    Data from Local System

    1
    T1005

    Impact

    Inhibit System Recovery

    2
    T1490

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Temp\F038.tmp.bat
      MD5

      7844035257d26b11f6237fbc0f6b8956

      SHA1

      23b80b9b57a174a416be79dc939aa34e28787439

      SHA256

      51777bf3e6d4742c4159020e8388174a7b39b7771fcc14761cf2a5a34d826ce6

      SHA512

      b457fe73d99968a5a62f23b24c0ab8986cb7572927e307b31482f7d4d2bfa96ab61782056badb357f2850c32401826f04777f5a827b3ac433fdbcbcbd271900c

    • C:\Users\Admin\Desktop\9BD76B-Readme.txt
      MD5

      a604144bcace154f21bdf6d0e470f88f

      SHA1

      96482cd8c2328d30593159d9cc106eddf57e0fd2

      SHA256

      b95537b48da34575b2549ccd9c546e5757c1f05861e60f8dd508f3984490ec7c

      SHA512

      9f59cc77bc94e249fb9fab94b48343ff96270bbce54154465c6dd30a5ab4cea673da471645d0161348033146834219c001e26a77e2ee6fd3eaba8b64b5a51f55

    • memory/568-11-0x0000000000000000-mapping.dmp
    • memory/2024-0-0x0000000000000000-mapping.dmp
    • memory/6868-3-0x0000000000000000-mapping.dmp
    • memory/6952-6-0x0000000000000000-mapping.dmp