Analysis

  • max time kernel
    167s
  • max time network
    184s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231025-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231025-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19/11/2023, 23:33

General

  • Target

    35da7aab0d190d5aeb04eaaa179c1cbd2302004c7671d6c71bc078a3df97d652.exe

  • Size

    274KB

  • MD5

    59e1227450eb946f0eb83fad2f72b1f5

  • SHA1

    b78400bfe2fb0dbe892b1dff5220a7de2c43dfc6

  • SHA256

    35da7aab0d190d5aeb04eaaa179c1cbd2302004c7671d6c71bc078a3df97d652

  • SHA512

    19fd57f8a026cd2cc64f4d8ac99538b9d90f9a33a3d70c2061131ea5094a53fa0c4bf23a6adaf51d06bdd799236860311cb4f67e7503ac43259461aedfeda1c2

  • SSDEEP

    3072:QlnO9lcF4LS5ZUsBHS9R071uEcR647ovb3Trh6e:UnXKL+By9R0ooMMrT

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

jotunheim.name

Signatures

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • Creates new service(s) 1 TTPs
  • Modifies Windows Firewall 1 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 2 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Launches sc.exe 3 IoCs

    Sc.exe is a Windows utlilty to control services on the system.

  • Enumerates physical storage devices 1 TTPs

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

  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\35da7aab0d190d5aeb04eaaa179c1cbd2302004c7671d6c71bc078a3df97d652.exe
    "C:\Users\Admin\AppData\Local\Temp\35da7aab0d190d5aeb04eaaa179c1cbd2302004c7671d6c71bc078a3df97d652.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:912
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\nhinpoql\
      2⤵
        PID:3744
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\htjwkjbf.exe" C:\Windows\SysWOW64\nhinpoql\
        2⤵
          PID:2832
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create nhinpoql binPath= "C:\Windows\SysWOW64\nhinpoql\htjwkjbf.exe /d\"C:\Users\Admin\AppData\Local\Temp\35da7aab0d190d5aeb04eaaa179c1cbd2302004c7671d6c71bc078a3df97d652.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2144
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description nhinpoql "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4640
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start nhinpoql
          2⤵
          • Launches sc.exe
          PID:4956
        • C:\Windows\SysWOW64\netsh.exe
          "C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
          2⤵
          • Modifies Windows Firewall
          PID:1660
      • C:\Windows\SysWOW64\nhinpoql\htjwkjbf.exe
        C:\Windows\SysWOW64\nhinpoql\htjwkjbf.exe /d"C:\Users\Admin\AppData\Local\Temp\35da7aab0d190d5aeb04eaaa179c1cbd2302004c7671d6c71bc078a3df97d652.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2536
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:3376

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

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

              Filesize

              10.0MB

              MD5

              9ae6c5ad64e453c7395e6fa775251f9c

              SHA1

              670fb909bd410cc17bb60cbb4604d4f37fe50766

              SHA256

              ed8e9da02e52c5189f8c1d3267d415c10078c53195651ae9be0395a39c607eae

              SHA512

              9927b69bb9e0647e462dbd0975082c9c32ac7d73749b5bad4af6ec561834a5b4547b9f6a767c8e833e29151ae4c6fb128ccd7fda21a0828e6c4c1d233b5acfbc

            • C:\Windows\SysWOW64\nhinpoql\htjwkjbf.exe

              Filesize

              10.0MB

              MD5

              9ae6c5ad64e453c7395e6fa775251f9c

              SHA1

              670fb909bd410cc17bb60cbb4604d4f37fe50766

              SHA256

              ed8e9da02e52c5189f8c1d3267d415c10078c53195651ae9be0395a39c607eae

              SHA512

              9927b69bb9e0647e462dbd0975082c9c32ac7d73749b5bad4af6ec561834a5b4547b9f6a767c8e833e29151ae4c6fb128ccd7fda21a0828e6c4c1d233b5acfbc

            • memory/912-2-0x0000000002240000-0x0000000002253000-memory.dmp

              Filesize

              76KB

            • memory/912-3-0x0000000000400000-0x00000000004F9000-memory.dmp

              Filesize

              996KB

            • memory/912-5-0x0000000000400000-0x00000000004F9000-memory.dmp

              Filesize

              996KB

            • memory/912-7-0x00000000005D0000-0x00000000006D0000-memory.dmp

              Filesize

              1024KB

            • memory/912-9-0x0000000002240000-0x0000000002253000-memory.dmp

              Filesize

              76KB

            • memory/912-10-0x0000000000400000-0x00000000004F9000-memory.dmp

              Filesize

              996KB

            • memory/912-1-0x00000000005D0000-0x00000000006D0000-memory.dmp

              Filesize

              1024KB

            • memory/2536-16-0x0000000000400000-0x00000000004F9000-memory.dmp

              Filesize

              996KB

            • memory/2536-14-0x0000000000870000-0x0000000000970000-memory.dmp

              Filesize

              1024KB

            • memory/3376-35-0x0000000001B60000-0x0000000001B70000-memory.dmp

              Filesize

              64KB

            • memory/3376-42-0x0000000001B60000-0x0000000001B70000-memory.dmp

              Filesize

              64KB

            • memory/3376-21-0x0000000000590000-0x00000000005A5000-memory.dmp

              Filesize

              84KB

            • memory/3376-23-0x0000000002400000-0x000000000260F000-memory.dmp

              Filesize

              2.1MB

            • memory/3376-26-0x0000000002400000-0x000000000260F000-memory.dmp

              Filesize

              2.1MB

            • memory/3376-27-0x00000000009A0000-0x00000000009A6000-memory.dmp

              Filesize

              24KB

            • memory/3376-30-0x0000000001B60000-0x0000000001B70000-memory.dmp

              Filesize

              64KB

            • memory/3376-33-0x0000000001B60000-0x0000000001B70000-memory.dmp

              Filesize

              64KB

            • memory/3376-34-0x0000000001B60000-0x0000000001B70000-memory.dmp

              Filesize

              64KB

            • memory/3376-13-0x0000000000590000-0x00000000005A5000-memory.dmp

              Filesize

              84KB

            • memory/3376-36-0x0000000001B60000-0x0000000001B70000-memory.dmp

              Filesize

              64KB

            • memory/3376-37-0x0000000001B60000-0x0000000001B70000-memory.dmp

              Filesize

              64KB

            • memory/3376-38-0x0000000001B60000-0x0000000001B70000-memory.dmp

              Filesize

              64KB

            • memory/3376-39-0x0000000001B60000-0x0000000001B70000-memory.dmp

              Filesize

              64KB

            • memory/3376-43-0x0000000001B60000-0x0000000001B70000-memory.dmp

              Filesize

              64KB

            • memory/3376-20-0x0000000000590000-0x00000000005A5000-memory.dmp

              Filesize

              84KB

            • memory/3376-44-0x0000000001B60000-0x0000000001B70000-memory.dmp

              Filesize

              64KB

            • memory/3376-41-0x0000000001B60000-0x0000000001B70000-memory.dmp

              Filesize

              64KB

            • memory/3376-40-0x0000000001B60000-0x0000000001B70000-memory.dmp

              Filesize

              64KB

            • memory/3376-45-0x0000000001B60000-0x0000000001B70000-memory.dmp

              Filesize

              64KB

            • memory/3376-46-0x0000000001B60000-0x0000000001B70000-memory.dmp

              Filesize

              64KB

            • memory/3376-47-0x0000000001B60000-0x0000000001B70000-memory.dmp

              Filesize

              64KB

            • memory/3376-49-0x0000000001B60000-0x0000000001B70000-memory.dmp

              Filesize

              64KB

            • memory/3376-48-0x0000000001B60000-0x0000000001B70000-memory.dmp

              Filesize

              64KB

            • memory/3376-50-0x0000000001BF0000-0x0000000001BF5000-memory.dmp

              Filesize

              20KB

            • memory/3376-53-0x0000000001BF0000-0x0000000001BF5000-memory.dmp

              Filesize

              20KB

            • memory/3376-54-0x0000000007380000-0x000000000778B000-memory.dmp

              Filesize

              4.0MB

            • memory/3376-57-0x0000000007380000-0x000000000778B000-memory.dmp

              Filesize

              4.0MB

            • memory/3376-58-0x00000000029D0000-0x00000000029D7000-memory.dmp

              Filesize

              28KB

            • memory/3376-62-0x0000000000590000-0x00000000005A5000-memory.dmp

              Filesize

              84KB