Overview

overview

10

Static

static

35ff457Rk.bin.exe

windows7_x64

10

35ff457Rk.bin.exe

windows10_x64

10

Analysis

  • max time kernel
    289s
  • max time network
    216s
  • platform
    windows7_x64
  • resource
    win7v20210408
  • submitted
    10-06-2021 01:46

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General

  • Target

    35ff457Rk.bin.exe

  • Size

    304KB

  • MD5

    5ecae137bf33ecbb981f3b637b06efc5

  • SHA1

    371e01949b1c7316164021e38d624ffbcba3090a

  • SHA256

    4f6db0454c9afe37d358d1399fe8932bec799eb257df11eccc6ab87358c4efb3

  • SHA512

    753a63b1407b21cec5e50bd5ad7158917926c6502ac43ffb61e99a911371798bb05be2845598640ac018dd7d57ccddf3c1f7736d22d0b2c2edde2eb7188d0331

Score
10/10
ryukransomware

Malware Config

Extracted

Path

C:\users\Public\RyukReadMe.html

Family

ryuk

Ransom Note
contact balance of shadow universe Ryuk $password = 'yxFS7vMc'; $torlink = 'http://vqurn5zgys2zd5z5r5fxnfskpzr74i63ehk7ucmrlbvsuszapwoo62qd.onion'; function info(){alert("INSTRUCTION:\r\n1. Download tor browser.\r\n2. Open link through tor browser: " + $torlink + "\r\n3. Fill the form, your password: "+ $password +"\r\nWe will contact you shortly.\r\nAlways send files for test decryption.");};
URLs

http://vqurn5zgys2zd5z5r5fxnfskpzr74i63ehk7ucmrlbvsuszapwoo62qd.onion

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

    ransomwareryuk
  • Executes dropped EXE 2 IoCs
  • Modifies extensions of user files 26 IoCs

    Ransomware generally changes the extension on encrypted files.

    ransomware
  • Loads dropped DLL 4 IoCs
  • Drops desktop.ini file(s) 1 IoCs
  • Enumerates connected drives 3 TTPs 23 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • Drops file in Program Files directory 64 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Runs net.exe
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of WriteProcessMemory 40 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\35ff457Rk.bin.exe
    "C:\Users\Admin\AppData\Local\Temp\35ff457Rk.bin.exe"
    1⤵
    • Modifies extensions of user files
    • Loads dropped DLL
    • Drops desktop.ini file(s)
    • Enumerates connected drives
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:1892
    • C:\Users\Admin\AppData\Local\Temp\1073r.exe
      "C:\Users\Admin\AppData\Local\Temp\1073r.exe" 9 REP
      2⤵
      • Executes dropped EXE
      PID:752
    • C:\Users\Admin\AppData\Local\Temp\qAAiwCztslan.exe
      "C:\Users\Admin\AppData\Local\Temp\qAAiwCztslan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:476
    • C:\Windows\SysWOW64\net.exe
      "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1248
      • C:\Windows\SysWOW64\net1.exe
        C:\Windows\system32\net1 stop "audioendpointbuilder" /y
        3⤵
          PID:576
      • C:\Windows\SysWOW64\net.exe
        "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:912
        • C:\Windows\SysWOW64\net1.exe
          C:\Windows\system32\net1 stop "audioendpointbuilder" /y
          3⤵
            PID:1092
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "samss" /y
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:2036
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 stop "samss" /y
            3⤵
              PID:1452
          • C:\Windows\SysWOW64\net.exe
            "C:\Windows\System32\net.exe" stop "samss" /y
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:1076
            • C:\Windows\SysWOW64\net1.exe
              C:\Windows\system32\net1 stop "samss" /y
              3⤵
                PID:1012

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          • memory/476-73-0x0000000035000000-0x0000000035054000-memory.dmp

            Filesize

            336KB

            Download

          • memory/752-71-0x0000000035000000-0x0000000035054000-memory.dmp

            Filesize

            336KB

            Download

          • memory/1892-61-0x0000000075D51000-0x0000000075D53000-memory.dmp

            Filesize

            8KB

            Download

          • memory/1892-59-0x0000000000220000-0x0000000000246000-memory.dmp

            Filesize

            152KB

            Download

          • memory/1892-60-0x0000000035000000-0x0000000035054000-memory.dmp

            Filesize

            336KB

            Download