Analysis

  • max time kernel
    156s
  • max time network
    143s
  • platform
    windows7_x64
  • resource
    win7-en-20211208
  • submitted
    01-02-2022 01:36

General

  • Target

    15a4cd4a7baca3961fb0113164434c535af85cedd54744e14a4d4d7b106dd060.exe

  • Size

    66KB

  • MD5

    0ff5949ed496df2664684a8aa2d76f10

  • SHA1

    317943d31536d561bc517c24eb1736d63d6d569f

  • SHA256

    15a4cd4a7baca3961fb0113164434c535af85cedd54744e14a4d4d7b106dd060

  • SHA512

    0d4337506cdd4e4170839dfe527f4c43cfef4dcf6479e19e18747b84cf102837f90aa3bf3a5229a504c4d4429c885b2999191c6810bcadf60810ac423caad1d9

Malware Config

Extracted

Path

C:\Program Files\Java\jre7\bin\server\267A51-Readme.txt

Family

netwalker

Ransom Note
Hi! Your files are encrypted. All encrypted files for this computer has extension: .267a51 -- 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_267a51: qMvHL8Xt87O6De4HjemAMCi3Ute5rx6lNxq+tZesKHzZw8Aq2f YS5qY0QFtQrJ5/DSH3x2iNGVmK3zWS6JJo9CKq86rV6f0/0o4I +Lp9pk1YOfrAQaiPzg+ar6cWu+Di8GRS4jDjrCe4hf2Wzg0gLD wRbFG0WyDofk9i6OkBpbHnvY7EZcGQYM0HtGcEXnAxhN8Z88Tg Ci2dV2SSyV+peheahumBg8drgYpAZDn5fFxx5k16lk0Zvxw+vM M8xkjBfS64gOWmEpyfK4LkdKLLIM30tJkvnspQ+w==}
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.

  • 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.

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 5 IoCs
  • Suspicious use of WriteProcessMemory 4 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\15a4cd4a7baca3961fb0113164434c535af85cedd54744e14a4d4d7b106dd060.exe
    "C:\Users\Admin\AppData\Local\Temp\15a4cd4a7baca3961fb0113164434c535af85cedd54744e14a4d4d7b106dd060.exe"
    1⤵
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1892
    • C:\Windows\system32\vssadmin.exe
      C:\Windows\system32\vssadmin.exe delete shadows /all /quiet
      2⤵
      • Interacts with shadow copies
      PID:1768
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:1784

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • memory/1892-54-0x0000000076C61000-0x0000000076C63000-memory.dmp

    Filesize

    8KB