Overview

overview

10

Static

static

35ff457Rk....in.exe

windows7_x64

10

35ff457Rk....in.exe

windows10_x64

10

Analysis

  • max time kernel
    300s
  • max time network
    291s
  • platform
    windows10_x64
  • resource
    win10v20210408
  • submitted
    04-07-2021 23:43

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General

  • Target

    35ff457Rk.bin.exe.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 7 IoCs

    Ransomware generally changes the extension on encrypted files.

    ransomware
  • Drops startup file 1 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 4 IoCs
  • Suspicious behavior: RenamesItself 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 42 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\35ff457Rk.bin.exe.bin.exe
    "C:\Users\Admin\AppData\Local\Temp\35ff457Rk.bin.exe.bin.exe"
    1⤵
    • Modifies extensions of user files
    • Drops startup file
    • Drops desktop.ini file(s)
    • Enumerates connected drives
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious behavior: RenamesItself
    • Suspicious use of WriteProcessMemory
    PID:3920
    • C:\Users\Admin\AppData\Local\Temp\1073r.exe
      "C:\Users\Admin\AppData\Local\Temp\1073r.exe" 9 REP
      2⤵
      • Executes dropped EXE
      PID:1200
    • C:\Users\Admin\AppData\Local\Temp\zbcRDXBUMlan.exe
      "C:\Users\Admin\AppData\Local\Temp\zbcRDXBUMlan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:1540
    • C:\Windows\SysWOW64\net.exe
      "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2352
      • C:\Windows\SysWOW64\net1.exe
        C:\Windows\system32\net1 stop "audioendpointbuilder" /y
        3⤵
          PID:1644
      • C:\Windows\SysWOW64\net.exe
        "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:2504
        • C:\Windows\SysWOW64\net1.exe
          C:\Windows\system32\net1 stop "audioendpointbuilder" /y
          3⤵
            PID:1260
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "samss" /y
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:2308
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 stop "samss" /y
            3⤵
              PID:1104
          • C:\Windows\SysWOW64\net.exe
            "C:\Windows\System32\net.exe" stop "samss" /y
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:3604
            • C:\Windows\SysWOW64\net1.exe
              C:\Windows\system32\net1 stop "samss" /y
              3⤵
                PID:2136
            • C:\Windows\SysWOW64\net.exe
              "C:\Windows\System32\net.exe" stop "coremessagingregistrar" /y
              2⤵
              • Suspicious use of WriteProcessMemory
              PID:2652
              • C:\Windows\SysWOW64\net1.exe
                C:\Windows\system32\net1 stop "coremessagingregistrar" /y
                3⤵
                  PID:3488
              • C:\Windows\SysWOW64\net.exe
                "C:\Windows\System32\net.exe" stop "coremessagingregistrar" /y
                2⤵
                • Suspicious use of WriteProcessMemory
                PID:2780
                • C:\Windows\SysWOW64\net1.exe
                  C:\Windows\system32\net1 stop "coremessagingregistrar" /y
                  3⤵
                    PID:2252
              • \??\c:\windows\system32\svchost.exe
                c:\windows\system32\svchost.exe -k netsvcs -s seclogon
                1⤵
                • Suspicious use of AdjustPrivilegeToken
                PID:3936

              Network

              MITRE ATT&CK Enterprise v6

              Replay Monitor

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              Downloads

              • memory/1200-122-0x00000000004E0000-0x000000000062A000-memory.dmp

                Filesize

                1.3MB

                Download

              • memory/1200-123-0x0000000035000000-0x0000000035054000-memory.dmp

                Filesize

                336KB

                Download

              • memory/1540-124-0x00000000004E0000-0x0000000000506000-memory.dmp

                Filesize

                152KB

                Download

              • memory/1540-125-0x0000000035000000-0x0000000035054000-memory.dmp

                Filesize

                336KB

                Download

              • memory/3920-115-0x0000000035000000-0x0000000035054000-memory.dmp

                Filesize

                336KB

                Download

              • memory/3920-114-0x00000000004C0000-0x000000000060A000-memory.dmp

                Filesize

                1.3MB

                Download