Analysis

  • max time kernel
    170s
  • max time network
    207s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-en-20220112
  • submitted
    20-02-2022 03:29

General

  • Target

    aa76633d91e96a6e583883381639329afc97f8bbda699c74577f32f35610df35.exe

  • Size

    168KB

  • MD5

    226a208a5421b06f3e2189f1ce516ae3

  • SHA1

    5b375d13a7a92962a4bbd7dac44e0c340e1de8b9

  • SHA256

    aa76633d91e96a6e583883381639329afc97f8bbda699c74577f32f35610df35

  • SHA512

    537351deba56379b58e98ecb1d885cab6ced7c406071477d69b33ea8b98fd5aa82b684a2c8503b188dba71c9c88cdacd94c67358ce9166b64afff3ef719fa1c4

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.

  • 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
  • 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 4 IoCs
  • Checks processor information in registry 2 TTPs 3 IoCs

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

  • Enumerates system info in registry 2 TTPs 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 8 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 25 IoCs

Processes

  • C:\Windows\System32\RuntimeBroker.exe
    C:\Windows\System32\RuntimeBroker.exe -Embedding
    1⤵
      PID:3008
    • C:\Windows\System32\RuntimeBroker.exe
      C:\Windows\System32\RuntimeBroker.exe -Embedding
      1⤵
        PID:228
      • C:\Windows\system32\backgroundTaskHost.exe
        "C:\Windows\system32\backgroundTaskHost.exe" -ServerName:App.AppXmtcan0h2tfbfy7k9kn8hbxb6dmzz1zh0.mca
        1⤵
          PID:3936
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 3936 -s 1804
            2⤵
            • Program crash
            • Checks processor information in registry
            • Enumerates system info in registry
            • Suspicious behavior: EnumeratesProcesses
            PID:4136
        • C:\Windows\system32\backgroundTaskHost.exe
          "C:\Windows\system32\backgroundTaskHost.exe" -ServerName:CortanaUI.AppX3bn25b6f886wmg6twh46972vprk9tnbf.mca
          1⤵
            PID:4060
          • C:\Windows\System32\RuntimeBroker.exe
            C:\Windows\System32\RuntimeBroker.exe -Embedding
            1⤵
              PID:3492
            • C:\Windows\System32\RuntimeBroker.exe
              C:\Windows\System32\RuntimeBroker.exe -Embedding
              1⤵
                PID:3132
              • C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\SearchApp.exe
                "C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\SearchApp.exe" -ServerName:CortanaUI.AppX8z9r6jm96hw4bsbneegw0kyxx296wr9t.mca
                1⤵
                  PID:976
                • C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe
                  "C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe" -ServerName:App.AppXywbrabmsek0gm3tkwpr5kwzbs55tkqay.mca
                  1⤵
                    PID:2936
                    • C:\Windows\system32\WerFault.exe
                      C:\Windows\system32\WerFault.exe -u -p 2936 -s 2124
                      2⤵
                      • Program crash
                      • Suspicious behavior: EnumeratesProcesses
                      PID:4144
                  • 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 356
                      2⤵
                      • Program crash
                      • Suspicious behavior: EnumeratesProcesses
                      PID:3800
                    • C:\Windows\system32\WerFault.exe
                      C:\Windows\system32\WerFault.exe -u -p 2760 -s 356
                      2⤵
                      • Program crash
                      PID:4152
                  • C:\Windows\system32\svchost.exe
                    C:\Windows\system32\svchost.exe -k ClipboardSvcGroup -p
                    1⤵
                      PID:2568
                    • C:\Windows\system32\taskhostw.exe
                      taskhostw.exe {222A245B-E637-4AE9-A93F-A59CA119A75E}
                      1⤵
                        PID:2308
                      • C:\Windows\system32\svchost.exe
                        C:\Windows\system32\svchost.exe -k UnistackSvcGroup
                        1⤵
                          PID:2256
                        • C:\Windows\system32\sihost.exe
                          sihost.exe
                          1⤵
                          • Drops file in Program Files directory
                          PID:2236
                        • C:\Users\Admin\AppData\Local\Temp\aa76633d91e96a6e583883381639329afc97f8bbda699c74577f32f35610df35.exe
                          "C:\Users\Admin\AppData\Local\Temp\aa76633d91e96a6e583883381639329afc97f8bbda699c74577f32f35610df35.exe"
                          1⤵
                          • Checks computer location settings
                          • Suspicious behavior: EnumeratesProcesses
                          • Suspicious use of AdjustPrivilegeToken
                          • Suspicious use of WriteProcessMemory
                          PID:3120
                          • 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\aa76633d91e96a6e583883381639329afc97f8bbda699c74577f32f35610df35.exe" /f
                            2⤵
                            • Suspicious use of WriteProcessMemory
                            PID:3168
                            • 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\aa76633d91e96a6e583883381639329afc97f8bbda699c74577f32f35610df35.exe" /f
                              3⤵
                              • Adds Run key to start application
                              PID:3688
                        • C:\Windows\system32\WerFault.exe
                          C:\Windows\system32\WerFault.exe -pss -s 408 -p 2760 -ip 2760
                          1⤵
                          • Suspicious use of NtCreateProcessExOtherParentProcess
                          • Suspicious use of WriteProcessMemory
                          PID:64
                        • C:\Windows\system32\WerFault.exe
                          C:\Windows\system32\WerFault.exe -pss -s 464 -p 2936 -ip 2936
                          1⤵
                          • Suspicious use of NtCreateProcessExOtherParentProcess
                          • Suspicious use of WriteProcessMemory
                          PID:4044
                        • C:\Windows\system32\WerFault.exe
                          C:\Windows\system32\WerFault.exe -pss -s 496 -p 3936 -ip 3936
                          1⤵
                          • Suspicious use of NtCreateProcessExOtherParentProcess
                          • Suspicious use of WriteProcessMemory
                          PID:3424

                        Network

                        MITRE ATT&CK Enterprise v6

                        Replay Monitor

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                        Downloads

                        • memory/2236-130-0x00007FF799600000-0x00007FF79998D000-memory.dmp

                          Filesize

                          3.6MB

                        • memory/3936-131-0x00007FF799600000-0x00007FF79998D000-memory.dmp

                          Filesize

                          3.6MB