Overview

overview

10

Static

static

46fb27f4cf...6e.exe

windows7_x64

10

46fb27f4cf...6e.exe

windows10-2004_x64

10

Analysis

  • max time kernel
    180s
  • max time network
    199s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-en-20220112
  • submitted
    20-02-2022 07:48

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General

  • Target

    46fb27f4cff2d33baae3b1c199797d1f0929bc03166cebd092081e4fe2f9ea6e.exe

  • Size

    152KB

  • MD5

    bc041eb3eeb75312288557c23e919caa

  • SHA1

    258c5fc6145aaeca748ae9fb85ca1d9dfba93fc6

  • SHA256

    46fb27f4cff2d33baae3b1c199797d1f0929bc03166cebd092081e4fe2f9ea6e

  • SHA512

    461a0c07559c66157c9f285fed06dfe4888438ce29eebfa4b7ed89fb53cd70e3a4e4fc05f3816344cd3bda3040762069724b1f51189955a5dbf1a714427842b6

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: 1L9fYHJJxeLMD2yyhh1cMFU2EWF5ihgAmJ Ryuk No system is safe
Wallets

1L9fYHJJxeLMD2yyhh1cMFU2EWF5ihgAmJ

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

    ransomwareryuk
  • Suspicious use of NtCreateProcessExOtherParentProcess 2 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

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

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

  • Program crash 3 IoCs
  • Checks processor information in registry 2 TTPs 2 IoCs

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

  • Modifies data under HKEY_USERS 47 IoCs
  • Modifies registry class 10 IoCs
  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Windows\system32\sihost.exe
    sihost.exe
    1⤵
    • Drops file in Program Files directory
    PID:2224
  • C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe
    "C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe" -ServerName:App.AppXywbrabmsek0gm3tkwpr5kwzbs55tkqay.mca
    1⤵
      PID:2864
      • C:\Windows\system32\WerFault.exe
        C:\Windows\system32\WerFault.exe -u -p 2864 -s 2188
        2⤵
        • Program crash
        • Suspicious behavior: EnumeratesProcesses
        PID:4412
    • C:\Windows\System32\RuntimeBroker.exe
      C:\Windows\System32\RuntimeBroker.exe -Embedding
      1⤵
        PID:3000
      • C:\Windows\system32\DllHost.exe
        C:\Windows\system32\DllHost.exe /Processid:{3EB3C877-1F16-487C-9050-104DBCD66683}
        1⤵
        • Suspicious use of WriteProcessMemory
        PID:2760
        • C:\Windows\system32\WerFault.exe
          C:\Windows\system32\WerFault.exe -u -p 2760 -s 404
          2⤵
          • Program crash
          • Suspicious behavior: EnumeratesProcesses
          PID:3252
        • C:\Windows\system32\WerFault.exe
          C:\Windows\system32\WerFault.exe -u -p 2760 -s 404
          2⤵
          • Program crash
          PID:4408
      • C:\Windows\System32\RuntimeBroker.exe
        C:\Windows\System32\RuntimeBroker.exe -Embedding
        1⤵
          PID:2624
        • C:\Windows\system32\backgroundTaskHost.exe
          "C:\Windows\system32\backgroundTaskHost.exe" -ServerName:App.AppXmtcan0h2tfbfy7k9kn8hbxb6dmzz1zh0.mca
          1⤵
            PID:916
          • C:\Windows\System32\RuntimeBroker.exe
            C:\Windows\System32\RuntimeBroker.exe -Embedding
            1⤵
            • Modifies registry class
            PID:2008
          • C:\Windows\System32\RuntimeBroker.exe
            C:\Windows\System32\RuntimeBroker.exe -Embedding
            1⤵
              PID:3372
            • C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\SearchApp.exe
              "C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\SearchApp.exe" -ServerName:CortanaUI.AppX8z9r6jm96hw4bsbneegw0kyxx296wr9t.mca
              1⤵
                PID:1276
              • C:\Windows\system32\svchost.exe
                C:\Windows\system32\svchost.exe -k ClipboardSvcGroup -p
                1⤵
                  PID:2544
                • C:\Windows\system32\taskhostw.exe
                  taskhostw.exe {222A245B-E637-4AE9-A93F-A59CA119A75E}
                  1⤵
                    PID:2296
                  • C:\Windows\system32\svchost.exe
                    C:\Windows\system32\svchost.exe -k UnistackSvcGroup
                    1⤵
                      PID:2240
                    • C:\Windows\system32\backgroundTaskHost.exe
                      "C:\Windows\system32\backgroundTaskHost.exe" -ServerName:CortanaUI.AppX3bn25b6f886wmg6twh46972vprk9tnbf.mca
                      1⤵
                        PID:860
                      • C:\Users\Admin\AppData\Local\Temp\46fb27f4cff2d33baae3b1c199797d1f0929bc03166cebd092081e4fe2f9ea6e.exe
                        "C:\Users\Admin\AppData\Local\Temp\46fb27f4cff2d33baae3b1c199797d1f0929bc03166cebd092081e4fe2f9ea6e.exe"
                        1⤵
                        • Checks computer location settings
                        • Suspicious behavior: EnumeratesProcesses
                        • Suspicious use of AdjustPrivilegeToken
                        • Suspicious use of WriteProcessMemory
                        PID:3228
                        • 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\46fb27f4cff2d33baae3b1c199797d1f0929bc03166cebd092081e4fe2f9ea6e.exe" /f
                          2⤵
                          • Suspicious use of WriteProcessMemory
                          PID:1916
                          • 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\46fb27f4cff2d33baae3b1c199797d1f0929bc03166cebd092081e4fe2f9ea6e.exe" /f
                            3⤵
                            • Adds Run key to start application
                            PID:1964
                      • C:\Windows\system32\MusNotifyIcon.exe
                        %systemroot%\system32\MusNotifyIcon.exe NotifyTrayIcon 13
                        1⤵
                        • Checks processor information in registry
                        PID:3276
                      • C:\Windows\system32\WerFault.exe
                        C:\Windows\system32\WerFault.exe -pss -s 480 -p 2760 -ip 2760
                        1⤵
                        • Suspicious use of NtCreateProcessExOtherParentProcess
                        • Suspicious use of WriteProcessMemory
                        PID:1564
                      • C:\Windows\system32\WerFault.exe
                        C:\Windows\system32\WerFault.exe -pss -s 476 -p 2864 -ip 2864
                        1⤵
                        • Suspicious use of NtCreateProcessExOtherParentProcess
                        • Suspicious use of WriteProcessMemory
                        PID:3120
                      • C:\Windows\System32\svchost.exe
                        C:\Windows\System32\svchost.exe -k NetworkService -p
                        1⤵
                        • Drops file in Windows directory
                        • Modifies data under HKEY_USERS
                        PID:4536

                      Network

                      MITRE ATT&CK Enterprise v6

                      Replay Monitor

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                      Downloads

                      • memory/2224-130-0x00007FF7DF0E0000-0x00007FF7DF469000-memory.dmp

                        Filesize

                        3.5MB

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