Analysis

  • max time kernel
    190s
  • max time network
    194s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-en-20220112
  • submitted
    20-02-2022 03:32

General

  • Target

    a93ebb14d2792370f7009b9accdc6901c90d4bdc5811c91002d19a6364825622.exe

  • Size

    208KB

  • MD5

    fb61f86d2ea604337ff2da9aaf4585c6

  • SHA1

    c5c63525bda35a317348adf7f2bd7eae9dee6de8

  • SHA256

    a93ebb14d2792370f7009b9accdc6901c90d4bdc5811c91002d19a6364825622

  • SHA512

    a8f03d7c63f974556b9c7a2ec12ddc14b7f6124f8ec74520afb0a00e124fc932f07050d1ae64d5be600d08bc5f518a7c458d5ae4813234c32e6ed6b3a982bc69

Score
10/10

Malware Config

Extracted

Path

C:\RyukReadMe.html

Family

ryuk

Ransom Note
<html><body><p style="font-weight:bold;font-size:125%;top:0;left:0;"> [email protected] <br> [email protected] </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:\Documents and Settings\Admin\3D Objects\RyukReadMe.html

Family

ryuk

Ransom Note
[email protected] [email protected] balance of shadow universe Ryuk

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

  • Suspicious use of NtCreateProcessExOtherParentProcess 2 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Drops desktop.ini file(s) 3 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Program crash 3 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
  • Modifies registry class 22 IoCs
  • Runs net.exe
  • Suspicious behavior: EnumeratesProcesses 20 IoCs
  • Suspicious use of AdjustPrivilegeToken 6 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Windows\System32\RuntimeBroker.exe
    C:\Windows\System32\RuntimeBroker.exe -Embedding
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:2980
  • C:\Windows\system32\BackgroundTransferHost.exe
    "BackgroundTransferHost.exe" -ServerName:BackgroundTransferHost.1
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:1720
    • C:\Windows\system32\WerFault.exe
      C:\Windows\system32\WerFault.exe -u -p 1720 -s 1264
      2⤵
      • Program crash
      • Checks processor information in registry
      • Enumerates system info in registry
      • Suspicious behavior: EnumeratesProcesses
      PID:5820
  • C:\Windows\System32\RuntimeBroker.exe
    C:\Windows\System32\RuntimeBroker.exe -Embedding
    1⤵
    • Modifies registry class
    PID:2924
  • C:\Windows\System32\RuntimeBroker.exe
    C:\Windows\System32\RuntimeBroker.exe -Embedding
    1⤵
      PID:3496
    • C:\Windows\System32\RuntimeBroker.exe
      C:\Windows\System32\RuntimeBroker.exe -Embedding
      1⤵
        PID:2772
      • C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\SearchApp.exe
        "C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\SearchApp.exe" -ServerName:CortanaUI.AppX8z9r6jm96hw4bsbneegw0kyxx296wr9t.mca
        1⤵
          PID:3068
        • C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe
          "C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe" -ServerName:App.AppXywbrabmsek0gm3tkwpr5kwzbs55tkqay.mca
          1⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:2916
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 2916 -s 2804
            2⤵
            • Program crash
            • Suspicious behavior: EnumeratesProcesses
            PID:5828
        • C:\Windows\system32\DllHost.exe
          C:\Windows\system32\DllHost.exe /Processid:{3EB3C877-1F16-487C-9050-104DBCD66683}
          1⤵
          • Suspicious use of WriteProcessMemory
          PID:2740
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 2740 -s 1004
            2⤵
            • Program crash
            • Suspicious behavior: EnumeratesProcesses
            PID:4808
        • C:\Windows\system32\svchost.exe
          C:\Windows\system32\svchost.exe -k ClipboardSvcGroup -p
          1⤵
            PID:2536
          • 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\sihost.exe
                sihost.exe
                1⤵
                • Drops desktop.ini file(s)
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                • Suspicious use of WriteProcessMemory
                PID:2224
                • C:\Windows\System32\net.exe
                  "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
                  2⤵
                  • Suspicious use of WriteProcessMemory
                  PID:2480
                  • C:\Windows\system32\net1.exe
                    C:\Windows\system32\net1 stop "audioendpointbuilder" /y
                    3⤵
                      PID:3516
                  • C:\Windows\System32\net.exe
                    "C:\Windows\System32\net.exe" stop "samss" /y
                    2⤵
                    • Suspicious use of WriteProcessMemory
                    PID:2496
                    • C:\Windows\system32\net1.exe
                      C:\Windows\system32\net1 stop "samss" /y
                      3⤵
                        PID:2220
                    • C:\Windows\System32\net.exe
                      "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
                      2⤵
                      • Suspicious use of WriteProcessMemory
                      PID:5648
                      • C:\Windows\system32\net1.exe
                        C:\Windows\system32\net1 stop "audioendpointbuilder" /y
                        3⤵
                          PID:5708
                      • C:\Windows\System32\net.exe
                        "C:\Windows\System32\net.exe" stop "samss" /y
                        2⤵
                        • Suspicious use of WriteProcessMemory
                        PID:5728
                        • C:\Windows\system32\net1.exe
                          C:\Windows\system32\net1 stop "samss" /y
                          3⤵
                            PID:5780
                      • C:\Users\Admin\AppData\Local\Temp\a93ebb14d2792370f7009b9accdc6901c90d4bdc5811c91002d19a6364825622.exe
                        "C:\Users\Admin\AppData\Local\Temp\a93ebb14d2792370f7009b9accdc6901c90d4bdc5811c91002d19a6364825622.exe"
                        1⤵
                        • Checks computer location settings
                        • Drops desktop.ini file(s)
                        • Suspicious behavior: EnumeratesProcesses
                        • Suspicious use of AdjustPrivilegeToken
                        • Suspicious use of WriteProcessMemory
                        PID:3472
                        • C:\Windows\System32\net.exe
                          "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
                          2⤵
                          • Suspicious use of WriteProcessMemory
                          PID:1424
                          • C:\Windows\system32\net1.exe
                            C:\Windows\system32\net1 stop "audioendpointbuilder" /y
                            3⤵
                              PID:3444
                          • C:\Windows\System32\net.exe
                            "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
                            2⤵
                            • Suspicious use of WriteProcessMemory
                            PID:3024
                            • C:\Windows\system32\net1.exe
                              C:\Windows\system32\net1 stop "audioendpointbuilder" /y
                              3⤵
                                PID:3892
                            • C:\Windows\System32\net.exe
                              "C:\Windows\System32\net.exe" stop "samss" /y
                              2⤵
                              • Suspicious use of WriteProcessMemory
                              PID:4980
                              • C:\Windows\system32\net1.exe
                                C:\Windows\system32\net1 stop "samss" /y
                                3⤵
                                  PID:5252
                              • C:\Windows\System32\net.exe
                                "C:\Windows\System32\net.exe" stop "samss" /y
                                2⤵
                                • Suspicious use of WriteProcessMemory
                                PID:5132
                                • C:\Windows\system32\net1.exe
                                  C:\Windows\system32\net1 stop "samss" /y
                                  3⤵
                                    PID:5260
                                • C:\Windows\System32\net.exe
                                  "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
                                  2⤵
                                  • Suspicious use of WriteProcessMemory
                                  PID:6028
                                  • C:\Windows\system32\net1.exe
                                    C:\Windows\system32\net1 stop "audioendpointbuilder" /y
                                    3⤵
                                      PID:6104
                                  • C:\Windows\System32\net.exe
                                    "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
                                    2⤵
                                    • Suspicious use of WriteProcessMemory
                                    PID:6020
                                    • C:\Windows\system32\net1.exe
                                      C:\Windows\system32\net1 stop "audioendpointbuilder" /y
                                      3⤵
                                        PID:6116
                                    • C:\Windows\System32\net.exe
                                      "C:\Windows\System32\net.exe" stop "samss" /y
                                      2⤵
                                      • Suspicious use of WriteProcessMemory
                                      PID:3784
                                      • C:\Windows\system32\net1.exe
                                        C:\Windows\system32\net1 stop "samss" /y
                                        3⤵
                                          PID:4552
                                      • C:\Windows\System32\net.exe
                                        "C:\Windows\System32\net.exe" stop "samss" /y
                                        2⤵
                                        • Suspicious use of WriteProcessMemory
                                        PID:5124
                                        • C:\Windows\system32\net1.exe
                                          C:\Windows\system32\net1 stop "samss" /y
                                          3⤵
                                            PID:3900
                                      • C:\Windows\system32\WerFault.exe
                                        C:\Windows\system32\WerFault.exe -pss -s 480 -p 2916 -ip 2916
                                        1⤵
                                        • Suspicious use of NtCreateProcessExOtherParentProcess
                                        • Suspicious use of WriteProcessMemory
                                        PID:5232
                                      • C:\Windows\system32\WerFault.exe
                                        C:\Windows\system32\WerFault.exe -pss -s 420 -p 1720 -ip 1720
                                        1⤵
                                        • Suspicious use of NtCreateProcessExOtherParentProcess
                                        • Suspicious use of WriteProcessMemory
                                        PID:5372

                                      Network

                                      MITRE ATT&CK Enterprise v6

                                      Replay Monitor

                                      Loading Replay Monitor...

                                      Downloads

                                      • memory/2224-130-0x00007FF7496B0000-0x00007FF74998C000-memory.dmp

                                        Filesize

                                        2.9MB

                                      • memory/2244-131-0x00007FF7496B0000-0x00007FF74998C000-memory.dmp

                                        Filesize

                                        2.9MB

                                      • memory/3496-132-0x00007FF7496B0000-0x00007FF74998C000-memory.dmp

                                        Filesize

                                        2.9MB