Overview

overview

10

Static

static

23bc676a01...3c.exe

windows7_x64

10

23bc676a01...3c.exe

windows10-2004_x64

10

Analysis

  • max time kernel
    181s
  • max time network
    182s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-en-20220112
  • submitted
    20/02/2022, 09:18

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General

  • Target
    23bc676a012c7fda532cbfc0d41ecd0bdda9b1cdd261e2923a03a7303bc1f33c.exe
  • Size 150KB
  • Sample220220-k92tpacaek
  • SHA256 23bc676a012c7fda532cbfc0d41ecd0bdda9b1cdd261e2923a03a7303bc1f33c
  • 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 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
  • 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 12 IoCs
  • Suspicious behavior: EnumeratesProcesses 10 IoCs
  • Suspicious use of AdjustPrivilegeToken 6 IoCs
  • Suspicious use of UnmapMainImage 1 IoCs
  • Suspicious use of WriteProcessMemory 25 IoCs

Processes

  • C:\Windows\system32\svchost.exe
    C:\Windows\system32\svchost.exe -k ClipboardSvcGroup -p
    1⤵
      PID:2456
    • C:\Windows\System32\RuntimeBroker.exe
      C:\Windows\System32\RuntimeBroker.exe -Embedding
      1⤵
        PID:3000
      • C:\Windows\System32\RuntimeBroker.exe
        C:\Windows\System32\RuntimeBroker.exe -Embedding
        1⤵
        • Modifies registry class
        • Suspicious use of UnmapMainImage
        PID:3676
      • C:\Windows\system32\backgroundTaskHost.exe
        "C:\Windows\system32\backgroundTaskHost.exe" -ServerName:App.AppXmtcan0h2tfbfy7k9kn8hbxb6dmzz1zh0.mca
        1⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:1588
        • C:\Windows\system32\WerFault.exe
          C:\Windows\system32\WerFault.exe -u -p 1588 -s 3436
          2⤵
          • Program crash
          • Checks processor information in registry
          • Enumerates system info in registry
          • Suspicious behavior: EnumeratesProcesses
          PID:4572
      • C:\Windows\System32\RuntimeBroker.exe
        C:\Windows\System32\RuntimeBroker.exe -Embedding
        1⤵
          PID:3616
        • C:\Windows\System32\RuntimeBroker.exe
          C:\Windows\System32\RuntimeBroker.exe -Embedding
          1⤵
            PID:3208
          • C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\SearchApp.exe
            "C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\SearchApp.exe" -ServerName:CortanaUI.AppX8z9r6jm96hw4bsbneegw0kyxx296wr9t.mca
            1⤵
              PID:2204
            • C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe
              "C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe" -ServerName:App.AppXywbrabmsek0gm3tkwpr5kwzbs55tkqay.mca
              1⤵
                PID:2828
                • C:\Windows\system32\WerFault.exe
                  C:\Windows\system32\WerFault.exe -u -p 2828 -s 3004
                  2⤵
                  • Program crash
                  • Suspicious behavior: EnumeratesProcesses
                  PID:4560
              • C:\Windows\system32\DllHost.exe
                C:\Windows\system32\DllHost.exe /Processid:{3EB3C877-1F16-487C-9050-104DBCD66683}
                1⤵
                • Suspicious use of WriteProcessMemory
                PID:2652
                • C:\Windows\system32\WerFault.exe
                  C:\Windows\system32\WerFault.exe -u -p 2652 -s 972
                  2⤵
                  • Program crash
                  • Suspicious behavior: EnumeratesProcesses
                  PID:3012
              • C:\Windows\system32\taskhostw.exe
                taskhostw.exe {222A245B-E637-4AE9-A93F-A59CA119A75E}
                1⤵
                  PID:2208
                • C:\Windows\system32\svchost.exe
                  C:\Windows\system32\svchost.exe -k UnistackSvcGroup
                  1⤵
                    PID:2160
                  • C:\Windows\system32\sihost.exe
                    sihost.exe
                    1⤵
                    • Drops file in Program Files directory
                    PID:2140
                  • C:\Users\Admin\AppData\Local\Temp\23bc676a012c7fda532cbfc0d41ecd0bdda9b1cdd261e2923a03a7303bc1f33c.exe
                    "C:\Users\Admin\AppData\Local\Temp\23bc676a012c7fda532cbfc0d41ecd0bdda9b1cdd261e2923a03a7303bc1f33c.exe"
                    1⤵
                    • Checks computer location settings
                    • Suspicious behavior: EnumeratesProcesses
                    • Suspicious use of AdjustPrivilegeToken
                    • Suspicious use of WriteProcessMemory
                    PID:3868
                    • 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\23bc676a012c7fda532cbfc0d41ecd0bdda9b1cdd261e2923a03a7303bc1f33c.exe" /f
                      2⤵
                      • Suspicious use of WriteProcessMemory
                      PID:3652
                      • 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\23bc676a012c7fda532cbfc0d41ecd0bdda9b1cdd261e2923a03a7303bc1f33c.exe" /f
                        3⤵
                        • Adds Run key to start application
                        PID:1900
                  • C:\Windows\system32\BackgroundTransferHost.exe
                    "BackgroundTransferHost.exe" -ServerName:BackgroundTransferHost.1
                    1⤵
                      PID:1168
                      • C:\Windows\system32\WerFault.exe
                        C:\Windows\system32\WerFault.exe -u -p 1168 -s 2768
                        2⤵
                        • Program crash
                        • Checks processor information in registry
                        • Enumerates system info in registry
                        • Suspicious behavior: EnumeratesProcesses
                        PID:4556
                    • C:\Windows\system32\WerFault.exe
                      C:\Windows\system32\WerFault.exe -pss -s 488 -p 2828 -ip 2828
                      1⤵
                      • Suspicious use of NtCreateProcessExOtherParentProcess
                      • Suspicious use of WriteProcessMemory
                      PID:4112
                    • C:\Windows\system32\WerFault.exe
                      C:\Windows\system32\WerFault.exe -pss -s 492 -p 1168 -ip 1168
                      1⤵
                      • Suspicious use of NtCreateProcessExOtherParentProcess
                      • Suspicious use of WriteProcessMemory
                      PID:4108
                    • C:\Windows\system32\WerFault.exe
                      C:\Windows\system32\WerFault.exe -pss -s 540 -p 1588 -ip 1588
                      1⤵
                      • Suspicious use of NtCreateProcessExOtherParentProcess
                      • Suspicious use of WriteProcessMemory
                      PID:4148
                    • 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:4484
                    • 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:3980

                    Network

                          MITRE ATT&CK Enterprise v6

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                          Downloads

                          memory/2140-130-0x00007FF61FC40000-0x00007FF61FFC9000-memory.dmp
                          Download

                          memory/2652-132-0x000001A8A9E40000-0x000001A8A9E48000-memory.dmp
                          Download

                          memory/2652-133-0x000001A8A9CE0000-0x000001A8A9CE1000-memory.dmp
                          Download