Overview

overview

10

Static

static

b8857e26d8...20.exe

windows7_x64

10

b8857e26d8...20.exe

windows10-2004_x64

10

Analysis

  • max time kernel
    166s
  • max time network
    141s
  • platform
    windows7_x64
  • resource
    win7-en-20211208
  • submitted
    20/02/2022, 02:49

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General

  • Target
    b8857e26d83b061ade0ade27558c4c6a83e80a6a85142d7c016e01a597852720.exe
  • Size 123KB
  • Sample220220-dbdkwaghgj
  • SHA256 b8857e26d83b061ade0ade27558c4c6a83e80a6a85142d7c016e01a597852720
  • MD5 SHA1 SHA512
Score
10/10
ryukpersistenceransomware

Malware Config

Extracted

Path

  • C:\RyukReadMe.txt

  • ryuk

Ransom Note
  • Your network has been penetrated. All files on each host in the network have been encrypted with a strong algorithm. Backups were either encrypted or deleted or backup disks were formatted. Shadow copies also removed, so F8 or any other methods may damage encrypted data but not recover. We exclusively have decryption software for your situation No decryption software is available in the public. DO NOT RESET OR SHUTDOWN - files may be damaged. DO NOT RENAME OR MOVE the encrypted and readme files. DO NOT DELETE readme files. This may lead to the impossibility of recovery of the certain files. To get info (decrypt your files) contact us at [email protected] or [email protected] BTC wallet: 1CN2iQbBikFK9jM34Nb3WLx5DCenQLnbXp Ryuk
Wallets

  • 1CN2iQbBikFK9jM34Nb3WLx5DCenQLnbXp

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

    ransomwareryuk
  • Adds Run key to start application 2 TTPs 2 IoCs
    persistence
  • 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.

  • Suspicious behavior: EnumeratesProcesses 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 11 IoCs

Processes

  • C:\Windows\system32\taskhost.exe
    "taskhost.exe"
    1⤵
      PID:1216
    • C:\Users\Admin\AppData\Local\Temp\b8857e26d83b061ade0ade27558c4c6a83e80a6a85142d7c016e01a597852720.exe
      "C:\Users\Admin\AppData\Local\Temp\b8857e26d83b061ade0ade27558c4c6a83e80a6a85142d7c016e01a597852720.exe"
      1⤵
      • Drops file in Program Files directory
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1360
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "C:\Users\Admin\AppData\Local\Temp\b8857e26d83b061ade0ade27558c4c6a83e80a6a85142d7c016e01a597852720.exe" /f /reg:64
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:864
        • C:\Windows\SysWOW64\reg.exe
          REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "C:\Users\Admin\AppData\Local\Temp\b8857e26d83b061ade0ade27558c4c6a83e80a6a85142d7c016e01a597852720.exe" /f /reg:64
          3⤵
          • Adds Run key to start application
          PID:648
    • C:\Windows\system32\Dwm.exe
      "C:\Windows\system32\Dwm.exe"
      1⤵
        PID:1316

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            memory/864-59-0x0000000030000000-0x000000003037E000-memory.dmp
            Download

            memory/1216-56-0x0000000030000000-0x000000003037E000-memory.dmp
            Download

            memory/1360-55-0x0000000074F11000-0x0000000074F13000-memory.dmp
            Download