Overview

overview

10

Static

static

f21f222d8f...38.exe

windows7_x64

10

f21f222d8f...38.exe

windows10-2004_x64

10

Analysis

  • max time kernel
    196s
  • max time network
    178s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-en-20220112
  • submitted
    20-02-2022 00:25

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General

  • Target

    f21f222d8f62f2223faec375e834efb76f96b73ef70e0ef09024586cf9eef638.exe

  • Size

    153KB

  • MD5

    61e6ce03440b0f92dbec5c1a519afa23

  • SHA1

    4579e18d96e6f00cce267cc64513e8689546da7a

  • SHA256

    f21f222d8f62f2223faec375e834efb76f96b73ef70e0ef09024586cf9eef638

  • SHA512

    e1aa4eb1b63d1cf8815c263c705407cffa90f024f8db8859b8a6969339f9a444c42cfe3f2c84f6474fb90cbfc8f571b177a941d86f184e4c322598bb9492176c

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: 1ChnbV4Rt7nsb5acw5YfYyvBFDj1RXcVQu Ryuk No system is safe
Wallets

1ChnbV4Rt7nsb5acw5YfYyvBFDj1RXcVQu

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

    ransomwareryuk
  • Suspicious use of NtCreateProcessExOtherParentProcess 3 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 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Program crash 4 IoCs
  • Checks processor information in registry 2 TTPs 6 IoCs

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

  • Enumerates system info in registry 2 TTPs 4 IoCs
  • Modifies data under HKEY_USERS 49 IoCs
  • Modifies registry class 18 IoCs
  • Suspicious behavior: EnumeratesProcesses 10 IoCs
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of WriteProcessMemory 25 IoCs

Processes

  • C:\Windows\System32\RuntimeBroker.exe
    C:\Windows\System32\RuntimeBroker.exe -Embedding
    1⤵
      PID:2936
    • C:\Windows\system32\BackgroundTransferHost.exe
      "BackgroundTransferHost.exe" -ServerName:BackgroundTransferHost.1
      1⤵
        PID:1776
        • C:\Windows\system32\WerFault.exe
          C:\Windows\system32\WerFault.exe -u -p 1776 -s 2728
          2⤵
          • Program crash
          • Checks processor information in registry
          • Enumerates system info in registry
          • Suspicious behavior: EnumeratesProcesses
          PID:4380
      • C:\Windows\System32\RuntimeBroker.exe
        C:\Windows\System32\RuntimeBroker.exe -Embedding
        1⤵
        • Modifies registry class
        PID:3544
      • C:\Windows\System32\RuntimeBroker.exe
        C:\Windows\System32\RuntimeBroker.exe -Embedding
        1⤵
          PID:3428
        • C:\Windows\System32\RuntimeBroker.exe
          C:\Windows\System32\RuntimeBroker.exe -Embedding
          1⤵
            PID:2904
          • C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\SearchApp.exe
            "C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\SearchApp.exe" -ServerName:CortanaUI.AppX8z9r6jm96hw4bsbneegw0kyxx296wr9t.mca
            1⤵
              PID:3024
            • C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe
              "C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe" -ServerName:App.AppXywbrabmsek0gm3tkwpr5kwzbs55tkqay.mca
              1⤵
                PID:2868
                • C:\Windows\system32\WerFault.exe
                  C:\Windows\system32\WerFault.exe -u -p 2868 -s 1316
                  2⤵
                  • Program crash
                  • Suspicious behavior: EnumeratesProcesses
                  PID:4372
              • 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 856
                  2⤵
                  • Program crash
                  • Suspicious behavior: EnumeratesProcesses
                  PID:832
              • C:\Windows\system32\svchost.exe
                C:\Windows\system32\svchost.exe -k ClipboardSvcGroup -p
                1⤵
                  PID:2564
                • C:\Windows\system32\taskhostw.exe
                  taskhostw.exe {222A245B-E637-4AE9-A93F-A59CA119A75E}
                  1⤵
                    PID:2320
                  • C:\Windows\system32\svchost.exe
                    C:\Windows\system32\svchost.exe -k UnistackSvcGroup
                    1⤵
                      PID:2284
                    • C:\Windows\system32\sihost.exe
                      sihost.exe
                      1⤵
                      • Drops file in Program Files directory
                      PID:2256
                    • C:\Users\Admin\AppData\Local\Temp\f21f222d8f62f2223faec375e834efb76f96b73ef70e0ef09024586cf9eef638.exe
                      "C:\Users\Admin\AppData\Local\Temp\f21f222d8f62f2223faec375e834efb76f96b73ef70e0ef09024586cf9eef638.exe"
                      1⤵
                      • Checks computer location settings
                      • Suspicious behavior: EnumeratesProcesses
                      • Suspicious use of AdjustPrivilegeToken
                      • Suspicious use of WriteProcessMemory
                      PID:3872
                      • 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\f21f222d8f62f2223faec375e834efb76f96b73ef70e0ef09024586cf9eef638.exe" /f
                        2⤵
                        • Suspicious use of WriteProcessMemory
                        PID:552
                        • 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\f21f222d8f62f2223faec375e834efb76f96b73ef70e0ef09024586cf9eef638.exe" /f
                          3⤵
                          • Adds Run key to start application
                          PID:832
                    • C:\Windows\system32\backgroundTaskHost.exe
                      "C:\Windows\system32\backgroundTaskHost.exe" -ServerName:App.AppXmtcan0h2tfbfy7k9kn8hbxb6dmzz1zh0.mca
                      1⤵
                        PID:1748
                        • C:\Windows\system32\WerFault.exe
                          C:\Windows\system32\WerFault.exe -u -p 1748 -s 1676
                          2⤵
                          • Program crash
                          • Checks processor information in registry
                          • Enumerates system info in registry
                          • Suspicious behavior: EnumeratesProcesses
                          PID:4388
                      • C:\Windows\system32\WerFault.exe
                        C:\Windows\system32\WerFault.exe -pss -s 488 -p 2868 -ip 2868
                        1⤵
                        • Suspicious use of NtCreateProcessExOtherParentProcess
                        • Suspicious use of WriteProcessMemory
                        PID:696
                      • C:\Windows\system32\WerFault.exe
                        C:\Windows\system32\WerFault.exe -pss -s 492 -p 1748 -ip 1748
                        1⤵
                        • Suspicious use of NtCreateProcessExOtherParentProcess
                        • Suspicious use of WriteProcessMemory
                        PID:3040
                      • C:\Windows\system32\WerFault.exe
                        C:\Windows\system32\WerFault.exe -pss -s 404 -p 1776 -ip 1776
                        1⤵
                        • Suspicious use of NtCreateProcessExOtherParentProcess
                        • Suspicious use of WriteProcessMemory
                        PID:2236
                      • 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:4168
                      • C:\Windows\winsxs\amd64_microsoft-windows-servicingstack_31bf3856ad364e35_10.0.19041.1220_none_7e21bc567c7ed16b\TiWorker.exe
                        C:\Windows\winsxs\amd64_microsoft-windows-servicingstack_31bf3856ad364e35_10.0.19041.1220_none_7e21bc567c7ed16b\TiWorker.exe -Embedding
                        1⤵
                        • Drops file in Windows directory
                        • Suspicious use of AdjustPrivilegeToken
                        PID:3712

                      Network

                      MITRE ATT&CK Enterprise v6

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                      Downloads

                      • memory/2256-130-0x00007FF608720000-0x00007FF608AA9000-memory.dmp

                        Filesize

                        3.5MB

                        Download

                      • memory/2284-131-0x00007FF608720000-0x00007FF608AA9000-memory.dmp

                        Filesize

                        3.5MB

                        Download