Analysis

  • max time kernel
    185s
  • max time network
    202s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-en-20220113
  • submitted
    20-02-2022 01:21

General

  • Target

    ddd788ff3ce2b36c84941bee081ec22aa3ad1f43c49f417d57b975f0dd3683a0.exe

  • Size

    118KB

  • MD5

    347eeae717c9af712bef4146374ea162

  • SHA1

    0b90db0136415072ade13f090dd99f8f3cb96404

  • SHA256

    ddd788ff3ce2b36c84941bee081ec22aa3ad1f43c49f417d57b975f0dd3683a0

  • SHA512

    cc66b1bccc65cf5a86d698d523a1217ec2e40d8fd005ab81891fef9d5008a044987fb9ec90e140c3dec650747c87a00aee3c7db8f332918e251eff95bc60c949

Malware Config

Extracted

Path

C:\users\Public\RyukReadMe.html

Family

ryuk

Ransom Note
contact balance of shadow universe Ryuk $password = 'AahZSQ5kzw'; $torlink = 'http://shemngcwq3kbpigejjxj5toggdqrfqq6qagp556yxglfxe4qq4xuc4yd.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://shemngcwq3kbpigejjxj5toggdqrfqq6qagp556yxglfxe4qq4xuc4yd.onion

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

  • Executes dropped EXE 3 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Modifies file permissions 1 TTPs 2 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\ddd788ff3ce2b36c84941bee081ec22aa3ad1f43c49f417d57b975f0dd3683a0.exe
    "C:\Users\Admin\AppData\Local\Temp\ddd788ff3ce2b36c84941bee081ec22aa3ad1f43c49f417d57b975f0dd3683a0.exe"
    1⤵
    • Checks computer location settings
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:1308
    • C:\Users\Admin\AppData\Local\Temp\IjueMhpBmrep.exe
      "C:\Users\Admin\AppData\Local\Temp\IjueMhpBmrep.exe" 9 REP
      2⤵
      • Executes dropped EXE
      PID:4712
    • C:\Users\Admin\AppData\Local\Temp\MAMiKRsaMlan.exe
      "C:\Users\Admin\AppData\Local\Temp\MAMiKRsaMlan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:3788
    • C:\Users\Admin\AppData\Local\Temp\wfslFdKiMlan.exe
      "C:\Users\Admin\AppData\Local\Temp\wfslFdKiMlan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:4844
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:2256
    • C:\Windows\SysWOW64\icacls.exe
      icacls "D:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:5020
    • C:\Windows\SysWOW64\net.exe
      "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:14936
      • C:\Windows\SysWOW64\net1.exe
        C:\Windows\system32\net1 stop "audioendpointbuilder" /y
        3⤵
          PID:19344
      • C:\Windows\SysWOW64\net.exe
        "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:14928
        • C:\Windows\SysWOW64\net1.exe
          C:\Windows\system32\net1 stop "audioendpointbuilder" /y
          3⤵
            PID:19360
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "samss" /y
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:14992
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 stop "samss" /y
            3⤵
              PID:19368
          • C:\Windows\SysWOW64\net.exe
            "C:\Windows\System32\net.exe" stop "samss" /y
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:15000
            • C:\Windows\SysWOW64\net1.exe
              C:\Windows\system32\net1 stop "samss" /y
              3⤵
                PID:19352

          Network

          MITRE ATT&CK Enterprise v6

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          Downloads