Overview

overview

10

Static

static

85d9b9e22f...e3.exe

windows7_x64

10

85d9b9e22f...e3.exe

windows10-2004_x64

10

Analysis

  • max time kernel
    185s
  • max time network
    191s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-en-20220112
  • submitted
    20-02-2022 05:02

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General

  • Target

    85d9b9e22f6b8e1f1d6a56d219d7c4d486b72657834050ce7652792536d0c8e3.exe

  • Size

    385KB

  • MD5

    3895a370b0c69c7e23ebb5ca1598525d

  • SHA1

    0eea1b978df04a50f44657bbdc520905fdcd11cc

  • SHA256

    85d9b9e22f6b8e1f1d6a56d219d7c4d486b72657834050ce7652792536d0c8e3

  • SHA512

    bc87ca0f0a4ba081e92eaab959988f29c8c0d2d338a7d679025a3d4c5921d20856b55febcc41b19c67f6a5a9f8e89bb60a11e641f54d2de62949e37ce6305f1c

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 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: 15FC73BdkpDMUWmxo7e7gtLRtM8gQgXyb4 Ryuk No system is safe
Wallets

15FC73BdkpDMUWmxo7e7gtLRtM8gQgXyb4

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

    ransomwareryuk
  • Suspicious use of NtCreateProcessExOtherParentProcess 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Checks computer location settings 2 TTPs 2 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 3 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Program crash 2 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 50 IoCs
  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 21 IoCs

Processes

  • C:\Windows\system32\svchost.exe
    C:\Windows\system32\svchost.exe -k UnistackSvcGroup
    1⤵
      PID:2128
    • C:\Windows\system32\DllHost.exe
      C:\Windows\system32\DllHost.exe /Processid:{3EB3C877-1F16-487C-9050-104DBCD66683}
      1⤵
        PID:2632
        • C:\Windows\system32\WerFault.exe
          C:\Windows\system32\WerFault.exe -u -p 2632 -s 996
          2⤵
          • Program crash
          • Suspicious behavior: EnumeratesProcesses
          PID:1860
      • C:\Windows\System32\RuntimeBroker.exe
        C:\Windows\System32\RuntimeBroker.exe -Embedding
        1⤵
          PID:2876
        • C:\Windows\System32\RuntimeBroker.exe
          C:\Windows\System32\RuntimeBroker.exe -Embedding
          1⤵
            PID:3344
          • C:\Windows\System32\RuntimeBroker.exe
            C:\Windows\System32\RuntimeBroker.exe -Embedding
            1⤵
              PID:1864
            • C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\SearchApp.exe
              "C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\SearchApp.exe" -ServerName:CortanaUI.AppX8z9r6jm96hw4bsbneegw0kyxx296wr9t.mca
              1⤵
                PID:2952
              • C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe
                "C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe" -ServerName:App.AppXywbrabmsek0gm3tkwpr5kwzbs55tkqay.mca
                1⤵
                  PID:2804
                  • C:\Windows\system32\WerFault.exe
                    C:\Windows\system32\WerFault.exe -u -p 2804 -s 2648
                    2⤵
                    • Program crash
                    • Suspicious behavior: EnumeratesProcesses
                    PID:400
                • C:\Windows\system32\svchost.exe
                  C:\Windows\system32\svchost.exe -k ClipboardSvcGroup -p
                  1⤵
                    PID:2436
                  • C:\Windows\system32\taskhostw.exe
                    taskhostw.exe {222A245B-E637-4AE9-A93F-A59CA119A75E}
                    1⤵
                      PID:2176
                    • C:\Windows\system32\sihost.exe
                      sihost.exe
                      1⤵
                      • Drops file in Program Files directory
                      PID:2108
                    • C:\Windows\System32\RuntimeBroker.exe
                      C:\Windows\System32\RuntimeBroker.exe -Embedding
                      1⤵
                        PID:1576
                      • C:\Users\Admin\AppData\Local\Temp\85d9b9e22f6b8e1f1d6a56d219d7c4d486b72657834050ce7652792536d0c8e3.exe
                        "C:\Users\Admin\AppData\Local\Temp\85d9b9e22f6b8e1f1d6a56d219d7c4d486b72657834050ce7652792536d0c8e3.exe"
                        1⤵
                        • Checks computer location settings
                        • Suspicious use of WriteProcessMemory
                        PID:3908
                        • C:\users\Public\uFeJb.exe
                          "C:\users\Public\uFeJb.exe" C:\Users\Admin\AppData\Local\Temp\85d9b9e22f6b8e1f1d6a56d219d7c4d486b72657834050ce7652792536d0c8e3.exe
                          2⤵
                          • Executes dropped EXE
                          • Checks computer location settings
                          • Suspicious behavior: EnumeratesProcesses
                          • Suspicious use of AdjustPrivilegeToken
                          • Suspicious use of WriteProcessMemory
                          PID:1476
                          • 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\Public\uFeJb.exe" /f
                            3⤵
                            • Suspicious use of WriteProcessMemory
                            PID:696
                            • C:\Windows\system32\reg.exe
                              REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "C:\users\Public\uFeJb.exe" /f
                              4⤵
                              • Adds Run key to start application
                              PID:2888
                      • C:\Windows\system32\MusNotifyIcon.exe
                        %systemroot%\system32\MusNotifyIcon.exe NotifyTrayIcon 13
                        1⤵
                        • Checks processor information in registry
                        PID:3436
                      • 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:3172
                      • 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:3028
                      • C:\Windows\system32\WerFault.exe
                        C:\Windows\system32\WerFault.exe -pss -s 408 -p 2632 -ip 2632
                        1⤵
                        • Suspicious use of NtCreateProcessExOtherParentProcess
                        • Suspicious use of WriteProcessMemory
                        PID:1032
                      • C:\Windows\system32\WerFault.exe
                        C:\Windows\system32\WerFault.exe -pss -s 540 -p 2804 -ip 2804
                        1⤵
                        • Suspicious use of NtCreateProcessExOtherParentProcess
                        • Suspicious use of WriteProcessMemory
                        PID:3448

                      Network

                      MITRE ATT&CK Enterprise v6

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                      Downloads

                      • memory/2108-132-0x00007FF653720000-0x00007FF653AAE000-memory.dmp

                        Filesize

                        3.6MB

                        Download

                      • memory/2436-133-0x00007FF653720000-0x00007FF653AAE000-memory.dmp

                        Filesize

                        3.6MB

                        Download