Overview

overview

10

Static

static

Ryuk

windows7_x64

10

Analysis

  • max time kernel
    301s
  • max time network
    138s
  • platform
    windows7_x64
  • resource
    win7v20210408
  • submitted
    22-04-2021 10:19

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General

  • Target

    boundless-season.exe

  • Size

    115KB

  • MD5

    d353b1061b2e2c5113f13bf271661bb3

  • SHA1

    0b193cd3216633eaed2cd29d50db6b3d2304fd4b

  • SHA256

    a14dd1e91fd88bd3605d2cef629555ef0fdc9fe945c5ba516d965fa52979cbe6

  • SHA512

    17cfd472c8f49fc5f6ecb252458bb0318c0a50405b31815376f603a7d9152b54dbcbbe3b92bebd0fc542bcfd2e596b812db47345144d4c653bd8be4fbb0ef76f

Score
10/10
ryukdiscoveryransomware

Malware Config

Extracted

Path

C:\users\Public\RyukReadMe.html

Family

ryuk

Ransom Note
contact balance of shadow universe Ryuk $password = 'dS4m6hyc'; $torlink = 'http://hqcqsw6et744hz7tx7rudmerk6fjyifovm6upec4ceqjndbmu34vs6yd.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://hqcqsw6et744hz7tx7rudmerk6fjyifovm6upec4ceqjndbmu34vs6yd.onion

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

    ransomwareryuk
  • Executes dropped EXE 3 IoCs
  • Modifies extensions of user files 6 IoCs

    Ransomware generally changes the extension on encrypted files.

    ransomware
  • Loads dropped DLL 6 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 1 IoCs

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

    persistence
  • Runs net.exe
  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\boundless-season.exe
    "C:\Users\Admin\AppData\Local\Temp\boundless-season.exe"
    1⤵
    • Modifies extensions of user files
    • Loads dropped DLL
    • Drops desktop.ini file(s)
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:1652
    • C:\Users\Admin\AppData\Local\Temp\fkKrJJbbrrep.exe
      "C:\Users\Admin\AppData\Local\Temp\fkKrJJbbrrep.exe" 9 REP
      2⤵
      • Executes dropped EXE
      PID:292
    • C:\Users\Admin\AppData\Local\Temp\OGWfHtHcslan.exe
      "C:\Users\Admin\AppData\Local\Temp\OGWfHtHcslan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:676
    • C:\Users\Admin\AppData\Local\Temp\QlYIXXmsBlan.exe
      "C:\Users\Admin\AppData\Local\Temp\QlYIXXmsBlan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:2612
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:2680
    • C:\Windows\SysWOW64\icacls.exe
      icacls "D:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:2692
    • C:\Windows\SysWOW64\net.exe
      "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3324
      • C:\Windows\SysWOW64\net1.exe
        C:\Windows\system32\net1 stop "audioendpointbuilder" /y
        3⤵
          PID:3404
      • C:\Windows\SysWOW64\net.exe
        "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:3336
        • C:\Windows\SysWOW64\net1.exe
          C:\Windows\system32\net1 stop "audioendpointbuilder" /y
          3⤵
            PID:3412
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "samss" /y
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:3448
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 stop "samss" /y
            3⤵
              PID:3520
          • C:\Windows\SysWOW64\net.exe
            "C:\Windows\System32\net.exe" stop "samss" /y
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:3440
            • C:\Windows\SysWOW64\net1.exe
              C:\Windows\system32\net1 stop "samss" /y
              3⤵
                PID:3528
            • C:\Windows\SysWOW64\net.exe
              "C:\Windows\System32\net.exe" stop "samss" /y
              2⤵
                PID:7132
                • C:\Windows\SysWOW64\net1.exe
                  C:\Windows\system32\net1 stop "samss" /y
                  3⤵
                    PID:6004
                • C:\Windows\SysWOW64\net.exe
                  "C:\Windows\System32\net.exe" stop "samss" /y
                  2⤵
                  • Suspicious use of WriteProcessMemory
                  PID:5992
                  • C:\Windows\SysWOW64\net1.exe
                    C:\Windows\system32\net1 stop "samss" /y
                    3⤵
                      PID:6052
                  • C:\Windows\SysWOW64\SCHTASKS.exe
                    SCHTASKS /CREATE /NP /SC DAILY /TN "PrintAH" /TR "C:\Windows\System32\cmd.exe /c for /l %x in (1,1,50) do start wordpad.exe /p C:\users\Public\HF0O8.dll" /ST 10:25 /SD 04/23/2021 /ED 04/30/2021
                    2⤵
                    • Creates scheduled task(s)
                    PID:3364

                Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                • memory/1652-60-0x00000000754F1000-0x00000000754F3000-memory.dmp

                  Filesize

                  8KB

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