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Analysis

  • max time kernel
    126s
  • max time network
    153s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    29/03/2021, 12:47

General

  • Target

    0323b4326bd6674f7d78360bb6544c4b34067066dda31e45edee91dec021e702.exe

  • Size

    208KB

  • MD5

    aa5abadf25aa3f30c1c83c5d43a7ee8f

  • SHA1

    ff50650068de776d2c0a8962cbccd7ffc431327a

  • SHA256

    0323b4326bd6674f7d78360bb6544c4b34067066dda31e45edee91dec021e702

  • SHA512

    033139017097fc0b5f296f9a861ee0ebc2faacb0a9ce172898a5765906010cce4bb30d7436afaeafe131b25ff2c51362825e25c60b2ab9d858672a555b28d7fb

Malware Config

Extracted

Path

C:\users\Public\RyukReadMe.html

Family

ryuk

Ransom Note
contact balance of shadow universe Ryuk $password = 'JZwuk732'; $torlink = 'http://ylohxrulsdb4ex6hmartra3g63khdb4ku7qkh4qcal2n3nm33vokiiyd.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://ylohxrulsdb4ex6hmartra3g63khdb4ku7qkh4qcal2n3nm33vokiiyd.onion

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

  • Executes dropped EXE 3 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 4 IoCs
  • Suspicious use of WriteProcessMemory 39 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\0323b4326bd6674f7d78360bb6544c4b34067066dda31e45edee91dec021e702.exe
    "C:\Users\Admin\AppData\Local\Temp\0323b4326bd6674f7d78360bb6544c4b34067066dda31e45edee91dec021e702.exe"
    1⤵
    • Drops desktop.ini file(s)
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:648
    • C:\Users\Admin\AppData\Local\Temp\RegMmSkEKrep.exe
      "C:\Users\Admin\AppData\Local\Temp\RegMmSkEKrep.exe" 9 REP
      2⤵
      • Executes dropped EXE
      PID:3548
    • C:\Users\Admin\AppData\Local\Temp\rChahhASZlan.exe
      "C:\Users\Admin\AppData\Local\Temp\rChahhASZlan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:2556
    • C:\Users\Admin\AppData\Local\Temp\esnhJBQuelan.exe
      "C:\Users\Admin\AppData\Local\Temp\esnhJBQuelan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:3860
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:4484
    • C:\Windows\SysWOW64\icacls.exe
      icacls "D:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:4496
    • C:\Windows\SysWOW64\net.exe
      "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:5080
      • C:\Windows\SysWOW64\net1.exe
        C:\Windows\system32\net1 stop "audioendpointbuilder" /y
        3⤵
          PID:4456
      • C:\Windows\SysWOW64\net.exe
        "C:\Windows\System32\net.exe" stop "samss" /y
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:4788
        • C:\Windows\SysWOW64\net1.exe
          C:\Windows\system32\net1 stop "samss" /y
          3⤵
            PID:4588
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:2336
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 stop "audioendpointbuilder" /y
            3⤵
              PID:5096
          • C:\Windows\SysWOW64\net.exe
            "C:\Windows\System32\net.exe" stop "samss" /y
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:4944
            • C:\Windows\SysWOW64\net1.exe
              C:\Windows\system32\net1 stop "samss" /y
              3⤵
                PID:4864

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          • memory/648-4-0x0000000035000000-0x0000000035029000-memory.dmp

            Filesize

            164KB

          • memory/648-2-0x0000000002090000-0x0000000002091000-memory.dmp

            Filesize

            4KB

          • memory/648-26-0x0000000002E10000-0x0000000002E11000-memory.dmp

            Filesize

            4KB

          • memory/648-27-0x0000000003610000-0x0000000003611000-memory.dmp

            Filesize

            4KB

          • memory/648-3-0x0000000000550000-0x0000000000570000-memory.dmp

            Filesize

            128KB

          • memory/2556-15-0x00000000020F0000-0x00000000020F1000-memory.dmp

            Filesize

            4KB

          • memory/3548-9-0x00000000021E0000-0x00000000021E1000-memory.dmp

            Filesize

            4KB

          • memory/3860-21-0x0000000002080000-0x0000000002081000-memory.dmp

            Filesize

            4KB