Overview

overview

10

Static

static

Ryuk

windows7_x64

10

Analysis

  • max time kernel
    270s
  • max time network
    70s
  • platform
    windows7_x64
  • resource
    win7v20210408
  • submitted
    27-04-2021 14:41

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General

  • Target

    annoyed-boat.exe

  • Size

    152KB

  • MD5

    a36bf238e31af66bcc79ea8c774e0098

  • SHA1

    512d84fb8d7197a369f021e45adbaee88fcda158

  • SHA256

    52553630f01c9bedda6fb049aa37e9e1cd60c554fe81b04a1f22ec6b3c5747df

  • SHA512

    00b5b8f9823ab63b153780ad3cc7d0569e39aeb2d48bee15a7a6d68a3358ec345f9065a63106f5401c64aec8580e4801131b55258ade9dec2d826d1781a5d37a

Score
10/10
ryukpersistenceransomware

Malware Config

Extracted

Path

C:\RyukReadMe.txt

Family

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 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. More than a year ago, world experts recognized the impossibility of deciphering by any means except the original decoder. No decryption software is available in the public. Antiviruse companies, researchers, IT specialists, and no other persons cant help you encrypt the data. DO NOT RESET OR SHUTDOWN - files may be damaged. DO NOT DELETE readme files. To confirm our honest intentions.Send 2 different random files and you will get it decrypted. It can be from different computers on your network to be sure that one key decrypts everything. 2 files we unlock for free To get info (decrypt your files) contact us at [email protected] or [email protected] BTC wallet: 1FRNVupsCyTjUvF36GxHZrvLaPtY6hgkTm Ryuk No system is safe
Wallets

1FRNVupsCyTjUvF36GxHZrvLaPtY6hgkTm

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

    ransomwareryuk
  • Drops file in Drivers directory 64 IoCs
  • Modifies extensions of user files 3 IoCs

    Ransomware generally changes the extension on encrypted files.

    ransomware
  • Drops startup file 1 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
    persistence
  • Drops file in System32 directory 64 IoCs
  • Drops file in Program Files directory 64 IoCs
  • Drops file in Windows directory 64 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Program crash 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 5 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 8 IoCs

Processes

  • C:\Windows\system32\Dwm.exe
    "C:\Windows\system32\Dwm.exe"
    1⤵
      PID:1168
    • C:\Windows\system32\taskhost.exe
      "taskhost.exe"
      1⤵
      • Drops file in Drivers directory
      • Modifies extensions of user files
      • Drops startup file
      • Drops file in System32 directory
      • Drops file in Program Files directory
      • Drops file in Windows directory
      PID:1112
    • C:\Users\Admin\AppData\Local\Temp\annoyed-boat.exe
      "C:\Users\Admin\AppData\Local\Temp\annoyed-boat.exe"
      1⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1304
      • C:\Windows\System32\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\annoyed-boat.exe" /f
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:1348
        • C:\Windows\system32\reg.exe
          REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "C:\Users\Admin\AppData\Local\Temp\annoyed-boat.exe" /f
          3⤵
          • Adds Run key to start application
          PID:1520
    • C:\Windows\system32\WerFault.exe
      C:\Windows\system32\WerFault.exe -u -p 1196 -s 1460
      1⤵
      • Program crash
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:38296

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

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    Downloads

    • memory/1112-63-0x000000013FB30000-0x000000013FEB9000-memory.dmp

      Filesize

      3.5MB

      Download

    • memory/1304-60-0x000007FEFB761000-0x000007FEFB763000-memory.dmp

      Filesize

      8KB

      Download

    • memory/38296-66-0x0000000001C90000-0x0000000001C91000-memory.dmp

      Filesize

      4KB

      Download