Overview

overview

10

Static

static

781bc4dcbd...le.exe

windows10_x64

10

Analysis

  • max time kernel
    542s
  • max time network
    597s
  • platform
    windows10_x64
  • resource
    win10-en-20211014
  • submitted
    20-10-2021 08:31

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General

  • Target

    781bc4dcbd459893397a8b987bf697f5b95435dfaf7fe3f4d2224728e7a2202a.bin.sample.exe

  • Size

    139KB

  • MD5

    8555b213260ba5eda4bf37652cecb431

  • SHA1

    80bd92b996fce311b52aa791a8ace4b20f8fb7ab

  • SHA256

    781bc4dcbd459893397a8b987bf697f5b95435dfaf7fe3f4d2224728e7a2202a

  • SHA512

    0e4056303a68e4c3af5b639fdc0f434ab81452c4d06d92b97f4a8fa39383a7f963ac9dd09c4e89250678b9bc77b5f9bfd14efc294fd493ffa4c058215ba1b136

Score
10/10
ryukdiscoveryransomware

Malware Config

Extracted

Path

C:\$Recycle.Bin\RyukReadMe.html

Family

ryuk

Ransom Note
contact balance of shadow universe Ryuk $password = 'TLS7ST8vlU'; $torlink = 'http://htv4omqldafxwhum7ya3m37o3zcbo2d7kidcpgvp6lky62gi6czx6iqd.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://htv4omqldafxwhum7ya3m37o3zcbo2d7kidcpgvp6lky62gi6czx6iqd.onion

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

    ransomwareryuk
  • Executes dropped EXE 3 IoCs
  • Modifies extensions of user files 16 IoCs

    Ransomware generally changes the extension on encrypted files.

    ransomware
  • 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
  • Drops file in Windows directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Checks SCSI registry key(s) 3 TTPs 3 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • 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 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of FindShellTrayWindow 64 IoCs
  • Suspicious use of SendNotifyMessage 64 IoCs
  • Suspicious use of WriteProcessMemory 54 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\781bc4dcbd459893397a8b987bf697f5b95435dfaf7fe3f4d2224728e7a2202a.bin.sample.exe
    "C:\Users\Admin\AppData\Local\Temp\781bc4dcbd459893397a8b987bf697f5b95435dfaf7fe3f4d2224728e7a2202a.bin.sample.exe"
    1⤵
    • Modifies extensions of user files
    • Drops startup file
    • Drops desktop.ini file(s)
    • Drops file in Program Files directory
    • Suspicious use of WriteProcessMemory
    PID:1836
    • C:\Users\Admin\AppData\Local\Temp\beqHZOlOnrep.exe
      "C:\Users\Admin\AppData\Local\Temp\beqHZOlOnrep.exe" 9 REP
      2⤵
      • Executes dropped EXE
      PID:708
    • C:\Users\Admin\AppData\Local\Temp\hfLFTsssnlan.exe
      "C:\Users\Admin\AppData\Local\Temp\hfLFTsssnlan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:876
    • C:\Users\Admin\AppData\Local\Temp\izMsYIWmVlan.exe
      "C:\Users\Admin\AppData\Local\Temp\izMsYIWmVlan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:896
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:3184
    • C:\Windows\SysWOW64\icacls.exe
      icacls "D:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:3220
    • C:\Windows\SysWOW64\net.exe
      "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2156
      • C:\Windows\SysWOW64\net1.exe
        C:\Windows\system32\net1 stop "audioendpointbuilder" /y
        3⤵
          PID:1740
      • C:\Windows\SysWOW64\net.exe
        "C:\Windows\System32\net.exe" stop "samss" /y
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:3560
        • C:\Windows\SysWOW64\net1.exe
          C:\Windows\system32\net1 stop "samss" /y
          3⤵
            PID:704
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:3540
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 stop "audioendpointbuilder" /y
            3⤵
              PID:1324
          • C:\Windows\SysWOW64\net.exe
            "C:\Windows\System32\net.exe" stop "samss" /y
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:3748
            • C:\Windows\SysWOW64\net1.exe
              C:\Windows\system32\net1 stop "samss" /y
              3⤵
                PID:3012
            • C:\Windows\SysWOW64\SCHTASKS.exe
              SCHTASKS /CREATE /NP /SC DAILY /TN "PrintCf" /TR "C:\Windows\System32\cmd.exe /c for /l %x in (1,1,50) do start wordpad.exe /p C:\users\Public\fUZIi.dll" /ST 10:25 /SD 10/21/2021 /ED 10/28/2021
              2⤵
              • Creates scheduled task(s)
              PID:4892
            • C:\Windows\SysWOW64\net.exe
              "C:\Windows\System32\net.exe" stop "samss" /y
              2⤵
              • Suspicious use of WriteProcessMemory
              PID:233292
              • C:\Windows\SysWOW64\net1.exe
                C:\Windows\system32\net1 stop "samss" /y
                3⤵
                  PID:233348
              • C:\Windows\SysWOW64\net.exe
                "C:\Windows\System32\net.exe" stop "samss" /y
                2⤵
                • Suspicious use of WriteProcessMemory
                PID:235488
                • C:\Windows\SysWOW64\net1.exe
                  C:\Windows\system32\net1 stop "samss" /y
                  3⤵
                    PID:235396
              • C:\Windows\system32\taskmgr.exe
                "C:\Windows\system32\taskmgr.exe" /4
                1⤵
                • Drops file in Windows directory
                • Checks SCSI registry key(s)
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious behavior: GetForegroundWindowSpam
                • Suspicious use of AdjustPrivilegeToken
                • Suspicious use of FindShellTrayWindow
                • Suspicious use of SendNotifyMessage
                PID:3332

              Network

              MITRE ATT&CK Enterprise v6

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              Downloads