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Analysis

  • max time kernel
    149s
  • max time network
    171s
  • platform
    windows7_x64
  • resource
    win7v20210408
  • submitted
    09/06/2021, 06:50

General

  • Target

    703ee3222eccd0e355b9ef414be9153fa3a2ad8efb8176fee887d7744a9f632f.exe

  • Size

    117KB

  • MD5

    31db87c5d3b970b42cb577611f851c7a

  • SHA1

    8cc6a1f94514033ad8b15c3c4c720fb0eac249f1

  • SHA256

    703ee3222eccd0e355b9ef414be9153fa3a2ad8efb8176fee887d7744a9f632f

  • SHA512

    d00d566f7385accd173669c9f8f6868626287e0ed4a6a08b174af9f6d054b70aed3babfa91450caa085134a2e75db42802a9cc11790c923ece3a4042d161be4a

Malware Config

Extracted

Path

C:\users\Public\RyukReadMe.html

Family

ryuk

Ransom Note
contact balance of shadow universe Ryuk $password = 'PrWUilDMFi'; $torlink = 'http://rdmnobnbtxh5sm3iiczazaregkpyyub3gktwneeehx62tyot5bc4qhad.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://rdmnobnbtxh5sm3iiczazaregkpyyub3gktwneeehx62tyot5bc4qhad.onion

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

  • Executes dropped EXE 3 IoCs
  • Loads dropped DLL 6 IoCs
  • Modifies file permissions 1 TTPs 2 IoCs
  • Drops desktop.ini file(s) 1 IoCs
  • 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 52 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\703ee3222eccd0e355b9ef414be9153fa3a2ad8efb8176fee887d7744a9f632f.exe
    "C:\Users\Admin\AppData\Local\Temp\703ee3222eccd0e355b9ef414be9153fa3a2ad8efb8176fee887d7744a9f632f.exe"
    1⤵
    • Loads dropped DLL
    • Drops desktop.ini file(s)
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:320
    • C:\Users\Admin\AppData\Local\Temp\ODNRSOrDzrep.exe
      "C:\Users\Admin\AppData\Local\Temp\ODNRSOrDzrep.exe" 9 REP
      2⤵
      • Executes dropped EXE
      PID:1364
    • C:\Users\Admin\AppData\Local\Temp\viCNfXyPXlan.exe
      "C:\Users\Admin\AppData\Local\Temp\viCNfXyPXlan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:1640
    • C:\Users\Admin\AppData\Local\Temp\zvkjDaksolan.exe
      "C:\Users\Admin\AppData\Local\Temp\zvkjDaksolan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:2524
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:2572
    • C:\Windows\SysWOW64\icacls.exe
      icacls "D:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:2584
    • C:\Windows\SysWOW64\net.exe
      "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2692
      • C:\Windows\SysWOW64\net1.exe
        C:\Windows\system32\net1 stop "audioendpointbuilder" /y
        3⤵
          PID:2632
      • C:\Windows\SysWOW64\net.exe
        "C:\Windows\System32\net.exe" stop "samss" /y
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:2616
        • C:\Windows\SysWOW64\net1.exe
          C:\Windows\system32\net1 stop "samss" /y
          3⤵
            PID:1296
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:2940
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 stop "audioendpointbuilder" /y
            3⤵
              PID:2648
          • C:\Windows\SysWOW64\net.exe
            "C:\Windows\System32\net.exe" stop "samss" /y
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:2712
            • C:\Windows\SysWOW64\net1.exe
              C:\Windows\system32\net1 stop "samss" /y
              3⤵
                PID:760

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          • memory/320-59-0x0000000075051000-0x0000000075053000-memory.dmp

            Filesize

            8KB