Analysis

  • max time kernel
    175s
  • max time network
    174s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-en-20220112
  • submitted
    20-02-2022 08:42

General

  • Target

    320c98a9fd479c43fde9d3773a9eccd58e6cc63d1ba93343222c0b565460d689.exe

  • Size

    190KB

  • MD5

    ffef678beca8ee60200bc88809d89630

  • SHA1

    b31070af1ac3e088dfc6f1599f8d12edb1b16783

  • SHA256

    320c98a9fd479c43fde9d3773a9eccd58e6cc63d1ba93343222c0b565460d689

  • SHA512

    54298098a866e24d99e3764154ae3ca4481e9163fd6e9e0d2c27d7978065a38da38accd58268c985b4ed0cfd4c11a27f4fa51e815c2d7a15e3ec18c453df89c3

Malware Config

Extracted

Path

C:\Users\Admin\AppData\Local\Temp\RyukReadMe.html

Family

ryuk

Ransom Note
<html><body><p style="font-weight:bold;font-size:125%;top:0;left:0;"> [email protected] <br> </p><p style="position:absolute;bottom:0;right:1%;font-weight:bold;font-size:170%">balance of shadow universe</p><div style="font-size: 550%;font-weight:bold;width:50%;height:50%;overflow:auto;margin:auto;position:absolute;top:35%;left:40%;">Ryuk</div></body></html�������������������������������������������������������������������������������������������������������������������������������������������������������

Extracted

Path

C:\RyukReadMe.html

Family

ryuk

Ransom Note
[email protected] balance of shadow universe Ryuk

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

  • Executes dropped EXE 1 IoCs
  • Checks computer location settings 2 TTPs 2 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Modifies file permissions 1 TTPs 4 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
  • Drops file in Windows directory 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies data under HKEY_USERS 49 IoCs
  • Runs net.exe
  • Suspicious behavior: EnumeratesProcesses 10 IoCs
  • Suspicious use of AdjustPrivilegeToken 45 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Windows\system32\sihost.exe
    sihost.exe
    1⤵
      PID:2228
    • C:\Windows\system32\taskhostw.exe
      taskhostw.exe {222A245B-E637-4AE9-A93F-A59CA119A75E}
      1⤵
        PID:2296
      • C:\Windows\system32\svchost.exe
        C:\Windows\system32\svchost.exe -k UnistackSvcGroup
        1⤵
          PID:2244
        • C:\Windows\system32\DllHost.exe
          C:\Windows\system32\DllHost.exe /Processid:{3EB3C877-1F16-487C-9050-104DBCD66683}
          1⤵
            PID:2744
          • C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe
            "C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe" -ServerName:App.AppXywbrabmsek0gm3tkwpr5kwzbs55tkqay.mca
            1⤵
              PID:2904
            • C:\Windows\system32\svchost.exe
              C:\Windows\system32\svchost.exe -k ClipboardSvcGroup -p
              1⤵
                PID:2528
              • C:\Windows\System32\RuntimeBroker.exe
                C:\Windows\System32\RuntimeBroker.exe -Embedding
                1⤵
                  PID:2984
                • C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\SearchApp.exe
                  "C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\SearchApp.exe" -ServerName:CortanaUI.AppX8z9r6jm96hw4bsbneegw0kyxx296wr9t.mca
                  1⤵
                    PID:3064
                  • C:\Windows\System32\RuntimeBroker.exe
                    C:\Windows\System32\RuntimeBroker.exe -Embedding
                    1⤵
                      PID:2628
                    • C:\Windows\System32\RuntimeBroker.exe
                      C:\Windows\System32\RuntimeBroker.exe -Embedding
                      1⤵
                        PID:2572
                      • C:\Windows\System32\RuntimeBroker.exe
                        C:\Windows\System32\RuntimeBroker.exe -Embedding
                        1⤵
                          PID:3324
                        • C:\Users\Admin\AppData\Local\Temp\320c98a9fd479c43fde9d3773a9eccd58e6cc63d1ba93343222c0b565460d689.exe
                          "C:\Users\Admin\AppData\Local\Temp\320c98a9fd479c43fde9d3773a9eccd58e6cc63d1ba93343222c0b565460d689.exe"
                          1⤵
                          • Checks computer location settings
                          • Suspicious behavior: EnumeratesProcesses
                          • Suspicious use of AdjustPrivilegeToken
                          • Suspicious use of WriteProcessMemory
                          PID:3808
                          • C:\Users\Admin\AppData\Local\Temp\xCQauhX.exe
                            "C:\Users\Admin\AppData\Local\Temp\xCQauhX.exe" 8 LAN
                            2⤵
                            • Executes dropped EXE
                            • Checks computer location settings
                            • Suspicious behavior: EnumeratesProcesses
                            • Suspicious use of AdjustPrivilegeToken
                            • Suspicious use of WriteProcessMemory
                            PID:1580
                            • C:\Windows\SysWOW64\icacls.exe
                              icacls "C:\*" /grant Everyone:F /T /C /Q
                              3⤵
                              • Modifies file permissions
                              PID:1872
                            • C:\Windows\SysWOW64\icacls.exe
                              icacls "D:\*" /grant Everyone:F /T /C /Q
                              3⤵
                              • Modifies file permissions
                              PID:1276
                            • C:\Windows\SysWOW64\cmd.exe
                              cmd /c "WMIC.exe shadowcopy delet"
                              3⤵
                              • Suspicious use of WriteProcessMemory
                              PID:3904
                              • C:\Windows\SysWOW64\Wbem\WMIC.exe
                                WMIC.exe shadowcopy delet
                                4⤵
                                • Suspicious use of AdjustPrivilegeToken
                                PID:1188
                            • C:\Windows\SysWOW64\net.exe
                              "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
                              3⤵
                              • Suspicious use of WriteProcessMemory
                              PID:2268
                              • C:\Windows\SysWOW64\net1.exe
                                C:\Windows\system32\net1 stop "audioendpointbuilder" /y
                                4⤵
                                  PID:3464
                              • C:\Windows\SysWOW64\net.exe
                                "C:\Windows\System32\net.exe" stop "samss" /y
                                3⤵
                                • Suspicious use of WriteProcessMemory
                                PID:1404
                                • C:\Windows\SysWOW64\net1.exe
                                  C:\Windows\system32\net1 stop "samss" /y
                                  4⤵
                                    PID:3120
                                • C:\Windows\SysWOW64\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\xCQauhX.exe" /f /reg:64
                                  3⤵
                                    PID:4440
                                • C:\Windows\SysWOW64\net.exe
                                  "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
                                  2⤵
                                  • Suspicious use of WriteProcessMemory
                                  PID:4068
                                  • C:\Windows\SysWOW64\net1.exe
                                    C:\Windows\system32\net1 stop "audioendpointbuilder" /y
                                    3⤵
                                      PID:1860
                                  • C:\Windows\SysWOW64\net.exe
                                    "C:\Windows\System32\net.exe" stop "samss" /y
                                    2⤵
                                    • Suspicious use of WriteProcessMemory
                                    PID:1780
                                    • C:\Windows\SysWOW64\net1.exe
                                      C:\Windows\system32\net1 stop "samss" /y
                                      3⤵
                                        PID:1052
                                    • C:\Windows\SysWOW64\icacls.exe
                                      icacls "C:\*" /grant Everyone:F /T /C /Q
                                      2⤵
                                      • Modifies file permissions
                                      PID:2304
                                    • C:\Windows\SysWOW64\cmd.exe
                                      cmd /c "WMIC.exe shadowcopy delet"
                                      2⤵
                                        PID:3308
                                        • C:\Windows\SysWOW64\Wbem\WMIC.exe
                                          WMIC.exe shadowcopy delet
                                          3⤵
                                          • Suspicious use of AdjustPrivilegeToken
                                          PID:4376
                                      • C:\Windows\SysWOW64\icacls.exe
                                        icacls "D:\*" /grant Everyone:F /T /C /Q
                                        2⤵
                                        • Modifies file permissions
                                        PID:3748
                                      • C:\Windows\SysWOW64\net.exe
                                        "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
                                        2⤵
                                          PID:3608
                                          • C:\Windows\SysWOW64\net1.exe
                                            C:\Windows\system32\net1 stop "audioendpointbuilder" /y
                                            3⤵
                                              PID:4320
                                          • C:\Windows\SysWOW64\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\320c98a9fd479c43fde9d3773a9eccd58e6cc63d1ba93343222c0b565460d689.exe" /f /reg:64
                                            2⤵
                                              PID:3232
                                              • C:\Windows\SysWOW64\reg.exe
                                                REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "C:\Users\Admin\AppData\Local\Temp\320c98a9fd479c43fde9d3773a9eccd58e6cc63d1ba93343222c0b565460d689.exe" /f /reg:64
                                                3⤵
                                                • Adds Run key to start application
                                                PID:4464
                                            • C:\Windows\SysWOW64\net.exe
                                              "C:\Windows\System32\net.exe" stop "samss" /y
                                              2⤵
                                                PID:4248
                                                • C:\Windows\SysWOW64\net1.exe
                                                  C:\Windows\system32\net1 stop "samss" /y
                                                  3⤵
                                                    PID:4352
                                              • C:\Windows\system32\backgroundTaskHost.exe
                                                "C:\Windows\system32\backgroundTaskHost.exe" -ServerName:App.AppXmtcan0h2tfbfy7k9kn8hbxb6dmzz1zh0.mca
                                                1⤵
                                                  PID:408
                                                • 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:1904

                                                Network

                                                MITRE ATT&CK Enterprise v6

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