Overview

overview

10

Static

static

7221538ebd...f4.exe

windows7_x64

10

7221538ebd...f4.exe

windows10_x64

10

Resubmissions

28/09/2020, 15:26

200928-jap5mhwsdn10

28/09/2020, 14:57

200928-g58jcc469e10

Analysis

  • max time kernel
    128s
  • max time network
    122s
  • platform
    windows10_x64
  • resource
    win10
  • submitted
    28/09/2020, 15:26

Sharing

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General

  • Target
    7221538ebdbae6a0681211bb3b3a36db9c4f306837b6559ae3d1abd1c08023f4.exe
  • Size 170KB
  • Sample200928-jap5mhwsdn
  • SHA256 7221538ebdbae6a0681211bb3b3a36db9c4f306837b6559ae3d1abd1c08023f4
  • 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: 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
  • Modifies extensions of user files 1 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
  • 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.

  • 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 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of UnmapMainImage 1 IoCs
  • Suspicious use of WriteProcessMemory 41 IoCs

Processes

  • 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:2768
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C "C:\users\Public\window.bat"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:80872
      • C:\Windows\system32\vssadmin.exe
        vssadmin Delete Shadows /all /quiet
        3⤵
        • Interacts with shadow copies
        PID:2540
      • C:\Windows\system32\vssadmin.exe
        vssadmin resize shadowstorage /for=c: /on=c: /maxsize=401MB
        3⤵
        • Interacts with shadow copies
        PID:48216
      • C:\Windows\system32\vssadmin.exe
        vssadmin resize shadowstorage /for=c: /on=c: /maxsize=unbounded
        3⤵
        • Interacts with shadow copies
        PID:2732
      • C:\Windows\system32\vssadmin.exe
        vssadmin resize shadowstorage /for=d: /on=d: /maxsize=401MB
        3⤵
        • Enumerates connected drives
        • Interacts with shadow copies
        PID:2108
      • C:\Windows\system32\vssadmin.exe
        vssadmin resize shadowstorage /for=d: /on=d: /maxsize=unbounded
        3⤵
        • Enumerates connected drives
        • Interacts with shadow copies
        PID:3920
      • C:\Windows\system32\vssadmin.exe
        vssadmin resize shadowstorage /for=e: /on=e: /maxsize=401MB
        3⤵
        • Enumerates connected drives
        • Interacts with shadow copies
        PID:736
      • C:\Windows\system32\vssadmin.exe
        vssadmin resize shadowstorage /for=e: /on=e: /maxsize=unbounded
        3⤵
        • Enumerates connected drives
        • Interacts with shadow copies
        PID:1616
      • C:\Windows\system32\vssadmin.exe
        vssadmin resize shadowstorage /for=f: /on=f: /maxsize=401MB
        3⤵
        • Enumerates connected drives
        • Interacts with shadow copies
        PID:1328
      • C:\Windows\system32\vssadmin.exe
        vssadmin resize shadowstorage /for=f: /on=f: /maxsize=unbounded
        3⤵
        • Enumerates connected drives
        • Interacts with shadow copies
        PID:2668
      • C:\Windows\system32\vssadmin.exe
        vssadmin resize shadowstorage /for=g: /on=g: /maxsize=401MB
        3⤵
        • Enumerates connected drives
        • Interacts with shadow copies
        PID:2924
      • C:\Windows\system32\vssadmin.exe
        vssadmin resize shadowstorage /for=g: /on=g: /maxsize=unbounded
        3⤵
        • Enumerates connected drives
        • Interacts with shadow copies
        PID:2148
      • C:\Windows\system32\vssadmin.exe
        vssadmin resize shadowstorage /for=h: /on=h: /maxsize=401MB
        3⤵
        • Enumerates connected drives
        • Interacts with shadow copies
        PID:1568
      • C:\Windows\system32\vssadmin.exe
        vssadmin resize shadowstorage /for=h: /on=h: /maxsize=unbounded
        3⤵
        • Enumerates connected drives
        • Interacts with shadow copies
        PID:1848
      • C:\Windows\system32\vssadmin.exe
        vssadmin Delete Shadows /all /quiet
        3⤵
        • Interacts with shadow copies
        PID:2092
  • c:\windows\system32\svchost.exe
    c:\windows\system32\svchost.exe -k unistacksvcgroup -s CDPUserSvc
    1⤵
      PID:2780
    • c:\windows\system32\taskhostw.exe
      taskhostw.exe {222A245B-E637-4AE9-A93F-A59CA119A75E}
      1⤵
        PID:2844
      • C:\Windows\SystemApps\ShellExperienceHost_cw5n1h2txyewy\ShellExperienceHost.exe
        "C:\Windows\SystemApps\ShellExperienceHost_cw5n1h2txyewy\ShellExperienceHost.exe" -ServerName:App.AppXtk181tbxbce2qsex02s8tw7hfxa9xb3t.mca
        1⤵
          PID:3112
        • C:\Windows\SystemApps\Microsoft.Windows.Cortana_cw5n1h2txyewy\SearchUI.exe
          "C:\Windows\SystemApps\Microsoft.Windows.Cortana_cw5n1h2txyewy\SearchUI.exe" -ServerName:CortanaUI.AppXa50dqqa5gqv4a428c9y1jjw7m3btvepj.mca
          1⤵
            PID:3128
          • C:\Windows\System32\RuntimeBroker.exe
            C:\Windows\System32\RuntimeBroker.exe -Embedding
            1⤵
              PID:3360
            • C:\Windows\system32\DllHost.exe
              C:\Windows\system32\DllHost.exe /Processid:{3EB3C877-1F16-487C-9050-104DBCD66683}
              1⤵
                PID:3668
              • C:\Users\Admin\AppData\Local\Temp\7221538ebdbae6a0681211bb3b3a36db9c4f306837b6559ae3d1abd1c08023f4.exe
                "C:\Users\Admin\AppData\Local\Temp\7221538ebdbae6a0681211bb3b3a36db9c4f306837b6559ae3d1abd1c08023f4.exe"
                1⤵
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                • Suspicious use of WriteProcessMemory
                PID:2896
                • 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\7221538ebdbae6a0681211bb3b3a36db9c4f306837b6559ae3d1abd1c08023f4.exe" /f
                  2⤵
                  • Suspicious use of WriteProcessMemory
                  PID:636
                  • 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\7221538ebdbae6a0681211bb3b3a36db9c4f306837b6559ae3d1abd1c08023f4.exe" /f
                    3⤵
                    • Adds Run key to start application
                    PID:368
              • C:\Windows\system32\vssvc.exe
                C:\Windows\system32\vssvc.exe
                1⤵
                • Suspicious use of AdjustPrivilegeToken
                PID:80808
              • \??\c:\windows\system32\sihost.exe
                sihost.exe
                1⤵
                • Suspicious use of FindShellTrayWindow
                PID:48244

              Network

                    MITRE ATT&CK Enterprise v6

                    Replay Monitor

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                    Downloads

                    memory/2768-1-0x00007FF7D1EC0000-0x00007FF7D224E000-memory.dmp
                    Download