Analysis

  • max time kernel
    150s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230915-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19/09/2023, 03:29

General

  • Target

    file.exe

  • Size

    221KB

  • MD5

    9af2dd9d72775a4bdfdda7877b47eef9

  • SHA1

    45da7ba126a46bc8922646a32e65e27486dabb73

  • SHA256

    d0f9030dbeed2cf285881eaa72226b8fb572ca7b70238cf79a0aa587d122cb39

  • SHA512

    4a49b1c06783b07616b74cc2434b72857c23fe4cc4f8d576915042f96e8daffb3c3837b9516fc878380b06f32f0c42c017d7b7eb7849548c4872ba56b665eb10

  • SSDEEP

    3072:8SL44qfLRy61pwVeeM/VHiJYPH6rGefwbGoFEbEmg5mgcp2Ts:t49fLY612VexHiJ2H6qefwb2Jngcp2T

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.

  • 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\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3200
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\omtlmmkh\
      2⤵
        PID:3572
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\sbhsqfx.exe" C:\Windows\SysWOW64\omtlmmkh\
        2⤵
          PID:4144
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create omtlmmkh binPath= "C:\Windows\SysWOW64\omtlmmkh\sbhsqfx.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4392
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description omtlmmkh "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2192
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start omtlmmkh
          2⤵
          • Launches sc.exe
          PID:1636
        • 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:4688
      • C:\Windows\SysWOW64\omtlmmkh\sbhsqfx.exe
        C:\Windows\SysWOW64\omtlmmkh\sbhsqfx.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1300
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:1816

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

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

              Filesize

              14.1MB

              MD5

              60c0a741778c3858a5da3c3e5b54efc0

              SHA1

              c5466a841dcb86b0ccf01796986b9ce4357d8dbb

              SHA256

              63cbb0f2795506039a43370de50875f0dad73ed36d574412a22a70b5511756d9

              SHA512

              8ccda599287b031cd9f6e37811512a6169d89fc57af2d32cbd86f5490e587fc022c7a78c45d44f5c5e9826f947c7615af1ae15c47b73148e985a470275546c73

            • C:\Windows\SysWOW64\omtlmmkh\sbhsqfx.exe

              Filesize

              14.1MB

              MD5

              60c0a741778c3858a5da3c3e5b54efc0

              SHA1

              c5466a841dcb86b0ccf01796986b9ce4357d8dbb

              SHA256

              63cbb0f2795506039a43370de50875f0dad73ed36d574412a22a70b5511756d9

              SHA512

              8ccda599287b031cd9f6e37811512a6169d89fc57af2d32cbd86f5490e587fc022c7a78c45d44f5c5e9826f947c7615af1ae15c47b73148e985a470275546c73

            • memory/1300-13-0x0000000000400000-0x00000000004E9000-memory.dmp

              Filesize

              932KB

            • memory/1300-11-0x0000000000400000-0x00000000004E9000-memory.dmp

              Filesize

              932KB

            • memory/1816-32-0x0000000001770000-0x0000000001780000-memory.dmp

              Filesize

              64KB

            • memory/1816-35-0x0000000001770000-0x0000000001780000-memory.dmp

              Filesize

              64KB

            • memory/1816-56-0x00000000025E0000-0x00000000025E7000-memory.dmp

              Filesize

              28KB

            • memory/1816-55-0x0000000006F80000-0x000000000738B000-memory.dmp

              Filesize

              4.0MB

            • memory/1816-52-0x0000000006F80000-0x000000000738B000-memory.dmp

              Filesize

              4.0MB

            • memory/1816-37-0x0000000001770000-0x0000000001780000-memory.dmp

              Filesize

              64KB

            • memory/1816-12-0x00000000001A0000-0x00000000001B5000-memory.dmp

              Filesize

              84KB

            • memory/1816-15-0x00000000001A0000-0x00000000001B5000-memory.dmp

              Filesize

              84KB

            • memory/1816-17-0x00000000001A0000-0x00000000001B5000-memory.dmp

              Filesize

              84KB

            • memory/1816-18-0x00000000001A0000-0x00000000001B5000-memory.dmp

              Filesize

              84KB

            • memory/1816-20-0x00000000001A0000-0x00000000001B5000-memory.dmp

              Filesize

              84KB

            • memory/1816-21-0x0000000002000000-0x000000000220F000-memory.dmp

              Filesize

              2.1MB

            • memory/1816-24-0x0000000002000000-0x000000000220F000-memory.dmp

              Filesize

              2.1MB

            • memory/1816-25-0x0000000001760000-0x0000000001766000-memory.dmp

              Filesize

              24KB

            • memory/1816-28-0x0000000001770000-0x0000000001780000-memory.dmp

              Filesize

              64KB

            • memory/1816-31-0x0000000001770000-0x0000000001780000-memory.dmp

              Filesize

              64KB

            • memory/1816-51-0x00000000025D0000-0x00000000025D5000-memory.dmp

              Filesize

              20KB

            • memory/1816-33-0x0000000001770000-0x0000000001780000-memory.dmp

              Filesize

              64KB

            • memory/1816-48-0x00000000025D0000-0x00000000025D5000-memory.dmp

              Filesize

              20KB

            • memory/1816-34-0x0000000001770000-0x0000000001780000-memory.dmp

              Filesize

              64KB

            • memory/1816-47-0x0000000001770000-0x0000000001780000-memory.dmp

              Filesize

              64KB

            • memory/1816-36-0x0000000001770000-0x0000000001780000-memory.dmp

              Filesize

              64KB

            • memory/1816-39-0x0000000001770000-0x0000000001780000-memory.dmp

              Filesize

              64KB

            • memory/1816-38-0x0000000001770000-0x0000000001780000-memory.dmp

              Filesize

              64KB

            • memory/1816-40-0x0000000001770000-0x0000000001780000-memory.dmp

              Filesize

              64KB

            • memory/1816-41-0x0000000001770000-0x0000000001780000-memory.dmp

              Filesize

              64KB

            • memory/1816-42-0x0000000001770000-0x0000000001780000-memory.dmp

              Filesize

              64KB

            • memory/1816-43-0x0000000001770000-0x0000000001780000-memory.dmp

              Filesize

              64KB

            • memory/1816-44-0x0000000001770000-0x0000000001780000-memory.dmp

              Filesize

              64KB

            • memory/1816-45-0x0000000001770000-0x0000000001780000-memory.dmp

              Filesize

              64KB

            • memory/1816-46-0x0000000001770000-0x0000000001780000-memory.dmp

              Filesize

              64KB

            • memory/3200-1-0x00000000006B0000-0x00000000006C3000-memory.dmp

              Filesize

              76KB

            • memory/3200-5-0x0000000000400000-0x00000000004E9000-memory.dmp

              Filesize

              932KB

            • memory/3200-0-0x0000000000690000-0x00000000006A5000-memory.dmp

              Filesize

              84KB

            • memory/3200-2-0x0000000000400000-0x00000000004E9000-memory.dmp

              Filesize

              932KB

            • memory/3200-7-0x00000000006B0000-0x00000000006C3000-memory.dmp

              Filesize

              76KB

            • memory/3200-6-0x0000000000690000-0x00000000006A5000-memory.dmp

              Filesize

              84KB