Overview

overview

10

Static

static

ryuk.exe

windows7_x64

10

ryuk.exe

windows10_x64

10

Analysis

  • max time kernel
    142s
  • max time network
    136s
  • platform
    windows10_x64
  • resource
    win10v20210410
  • submitted
    22-04-2021 06:54

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General

  • Target

    ryuk.exe

  • Size

    384KB

  • MD5

    5ac0f050f93f86e69026faea1fbb4450

  • SHA1

    9709774fde9ec740ad6fed8ed79903296ca9d571

  • SHA256

    23f8aa94ffb3c08a62735fe7fee5799880a8f322ce1d55ec49a13a3f85312db2

  • SHA512

    b554487c4e26a85ec5179cdcc1d25b5bc494e8821a8899fbbf868c3cf41f70cc72db107613b3f6655d3ab70f4db94cce2589066bb354b1ed955098d3911b844d

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 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: 14hVKm7Ft2rxDBFTNkkRC3kGstMGp2A4hk Ryuk No system is safe
Wallets

14hVKm7Ft2rxDBFTNkkRC3kGstMGp2A4hk

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

    ransomwareryuk
  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

    ransomware
  • Executes dropped EXE 1 IoCs
  • Modifies extensions of user files 1 IoCs

    Ransomware generally changes the extension on encrypted files.

    ransomware
  • Deletes itself 1 IoCs
  • Drops startup file 1 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
    persistence
  • Enumerates connected drives 3 TTPs 18 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • 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.

  • Program crash 1 IoCs
  • Interacts with shadow copies 2 TTPs 14 IoCs

    Shadow copies are often targeted by ransomware to inhibit system recovery.

    ransomware
  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 17 IoCs
  • Suspicious use of AdjustPrivilegeToken 5 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of UnmapMainImage 1 IoCs
  • Suspicious use of WriteProcessMemory 43 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\ryuk.exe
    "C:\Users\Admin\AppData\Local\Temp\ryuk.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:3176
    • C:\users\Public\magVI.exe
      "C:\users\Public\magVI.exe" C:\Users\Admin\AppData\Local\Temp\ryuk.exe
      2⤵
      • Executes dropped EXE
      • Deletes itself
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1396
      • 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\Public\magVI.exe" /f
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:4012
        • C:\Windows\system32\reg.exe
          REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "C:\users\Public\magVI.exe" /f
          4⤵
          • Adds Run key to start application
          PID:196
  • C:\Windows\system32\DllHost.exe
    C:\Windows\system32\DllHost.exe /Processid:{3EB3C877-1F16-487C-9050-104DBCD66683}
    1⤵
      PID:3820
      • C:\Windows\system32\WerFault.exe
        C:\Windows\system32\WerFault.exe -u -p 3820 -s 848
        2⤵
        • Program crash
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:2140
    • C:\Windows\System32\RuntimeBroker.exe
      C:\Windows\System32\RuntimeBroker.exe -Embedding
      1⤵
      • Drops file in Program Files directory
      PID:3548
    • C:\Windows\SystemApps\Microsoft.Windows.Cortana_cw5n1h2txyewy\SearchUI.exe
      "C:\Windows\SystemApps\Microsoft.Windows.Cortana_cw5n1h2txyewy\SearchUI.exe" -ServerName:CortanaUI.AppXa50dqqa5gqv4a428c9y1jjw7m3btvepj.mca
      1⤵
        PID:3296
      • C:\Windows\SystemApps\ShellExperienceHost_cw5n1h2txyewy\ShellExperienceHost.exe
        "C:\Windows\SystemApps\ShellExperienceHost_cw5n1h2txyewy\ShellExperienceHost.exe" -ServerName:App.AppXtk181tbxbce2qsex02s8tw7hfxa9xb3t.mca
        1⤵
          PID:3268
        • c:\windows\system32\taskhostw.exe
          taskhostw.exe {222A245B-E637-4AE9-A93F-A59CA119A75E}
          1⤵
            PID:2760
          • c:\windows\system32\svchost.exe
            c:\windows\system32\svchost.exe -k unistacksvcgroup -s CDPUserSvc
            1⤵
              PID:2456
            • c:\windows\system32\sihost.exe
              sihost.exe
              1⤵
              • Modifies extensions of user files
              • Drops startup file
              • Drops file in Program Files directory
              • Modifies registry class
              • Suspicious use of UnmapMainImage
              • Suspicious use of WriteProcessMemory
              PID:2436
              • C:\Windows\System32\cmd.exe
                "C:\Windows\System32\cmd.exe" /C "C:\users\Public\window.bat"
                2⤵
                • Suspicious use of WriteProcessMemory
                PID:78968
                • C:\Windows\system32\vssadmin.exe
                  vssadmin Delete Shadows /all /quiet
                  3⤵
                  • Interacts with shadow copies
                  PID:79028
                • C:\Windows\system32\vssadmin.exe
                  vssadmin resize shadowstorage /for=c: /on=c: /maxsize=401MB
                  3⤵
                  • Interacts with shadow copies
                  PID:79144
                • C:\Windows\system32\vssadmin.exe
                  vssadmin resize shadowstorage /for=c: /on=c: /maxsize=unbounded
                  3⤵
                  • Interacts with shadow copies
                  PID:79200
                • C:\Windows\system32\vssadmin.exe
                  vssadmin resize shadowstorage /for=d: /on=d: /maxsize=401MB
                  3⤵
                  • Enumerates connected drives
                  • Interacts with shadow copies
                  PID:79232
                • C:\Windows\system32\vssadmin.exe
                  vssadmin resize shadowstorage /for=d: /on=d: /maxsize=unbounded
                  3⤵
                  • Enumerates connected drives
                  • Interacts with shadow copies
                  PID:79264
                • C:\Windows\system32\vssadmin.exe
                  vssadmin resize shadowstorage /for=e: /on=e: /maxsize=401MB
                  3⤵
                  • Enumerates connected drives
                  • Interacts with shadow copies
                  PID:79300
                • C:\Windows\system32\vssadmin.exe
                  vssadmin resize shadowstorage /for=e: /on=e: /maxsize=unbounded
                  3⤵
                  • Enumerates connected drives
                  • Interacts with shadow copies
                  PID:79332
                • C:\Windows\system32\vssadmin.exe
                  vssadmin resize shadowstorage /for=f: /on=f: /maxsize=401MB
                  3⤵
                  • Enumerates connected drives
                  • Interacts with shadow copies
                  PID:79364
                • C:\Windows\system32\vssadmin.exe
                  vssadmin resize shadowstorage /for=f: /on=f: /maxsize=unbounded
                  3⤵
                  • Enumerates connected drives
                  • Interacts with shadow copies
                  PID:79396
                • C:\Windows\system32\vssadmin.exe
                  vssadmin resize shadowstorage /for=g: /on=g: /maxsize=401MB
                  3⤵
                  • Enumerates connected drives
                  • Interacts with shadow copies
                  PID:79444
                • C:\Windows\system32\vssadmin.exe
                  vssadmin resize shadowstorage /for=g: /on=g: /maxsize=unbounded
                  3⤵
                  • Enumerates connected drives
                  • Interacts with shadow copies
                  PID:79480
                • C:\Windows\system32\vssadmin.exe
                  vssadmin resize shadowstorage /for=h: /on=h: /maxsize=401MB
                  3⤵
                  • Enumerates connected drives
                  • Interacts with shadow copies
                  PID:79512
                • C:\Windows\system32\vssadmin.exe
                  vssadmin resize shadowstorage /for=h: /on=h: /maxsize=unbounded
                  3⤵
                  • Enumerates connected drives
                  • Interacts with shadow copies
                  PID:79544
                • C:\Windows\system32\vssadmin.exe
                  vssadmin Delete Shadows /all /quiet
                  3⤵
                  • Interacts with shadow copies
                  PID:79576
            • C:\Windows\system32\vssvc.exe
              C:\Windows\system32\vssvc.exe
              1⤵
              • Suspicious use of AdjustPrivilegeToken
              PID:79060
            • \??\c:\windows\system32\sihost.exe
              sihost.exe
              1⤵
              • Suspicious use of FindShellTrayWindow
              PID:79156

            Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            • memory/2436-119-0x00007FF782DB0000-0x00007FF78313E000-memory.dmp

              Filesize

              3.6MB

              Download