Overview

overview

10

Static

static

aa76633d91...35.exe

windows7_x64

10

aa76633d91...35.exe

windows10-2004_x64

10

Analysis

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

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General

  • Target
    aa76633d91e96a6e583883381639329afc97f8bbda699c74577f32f35610df35.exe
  • Size 168KB
  • Sample220220-d18gjsgcc6
  • SHA256 aa76633d91e96a6e583883381639329afc97f8bbda699c74577f32f35610df35
  • 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
  • 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
  • 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

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                              Downloads

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

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