Analysis

  • max time kernel
    149s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230915-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
  • submitted
    01/10/2023, 15:48

General

  • Target

    file.exe

  • Size

    199KB

  • MD5

    8c8b3b3e93edc084a60787d1670f6571

  • SHA1

    8d49792c08d05da4aad0943c953d4766e2c45d80

  • SHA256

    66bcc8dbc2c587eb355a5c51b2b344151ad657cf48c4bf22b23e20b4b5ff63a8

  • SHA512

    172af6fde03ec4ba45d8cd8ce20e4c675493546db78a91cc75c297d0610ad6a46b9ff9d6e8b5322eb8a709adbea02c57622684264e98c3aff50c5c2993dd255f

  • SSDEEP

    3072:pP+qB/Z2bdlViAD6DR4iq0S2AvHmZnTJmQ7rgAwrq0E0iXqJb5/HNl:p/8J+AD6m/9fmZnlmQ4AUEXa/Hf

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 AdjustPrivilegeToken 1 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:2372
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\dipnavqz\
      2⤵
        PID:4148
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\lxnaonfj.exe" C:\Windows\SysWOW64\dipnavqz\
        2⤵
          PID:2460
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create dipnavqz binPath= "C:\Windows\SysWOW64\dipnavqz\lxnaonfj.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1292
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description dipnavqz "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1896
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start dipnavqz
          2⤵
          • Launches sc.exe
          PID:3000
        • 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:992
      • C:\Windows\SysWOW64\dipnavqz\lxnaonfj.exe
        C:\Windows\SysWOW64\dipnavqz\lxnaonfj.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4788
        • 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:4480
      • C:\Windows\system32\rundll32.exe
        "C:\Windows\system32\rundll32.exe" "C:\Windows\SYSTEM32\EDGEHTML.dll",#141 Microsoft.VCLibs.140.00_8wekyb3d8bbwe
        1⤵
          PID:4820
        • C:\Windows\System32\svchost.exe
          C:\Windows\System32\svchost.exe -k UnistackSvcGroup
          1⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:1492

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

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

          Filesize

          11.4MB

          MD5

          6a2d81bed0b97cede6a22ffbfc26f1b0

          SHA1

          13057c97a008216da1f9d726ca548d0efc46fb85

          SHA256

          d109a5ea193196274d789a51d11db7cfb6f6dcb0db95c2ca95b97fbb2fe1e6ff

          SHA512

          13b3d2897cbd6e39e7d5c7677aba4adeaccdc0f79ea58a3f405932ecb36832bb80afae9e80a3cdf66a8e6a985057450318971e1307448e1f2697cb7ef61fa23f

        • C:\Windows\SysWOW64\dipnavqz\lxnaonfj.exe

          Filesize

          11.4MB

          MD5

          6a2d81bed0b97cede6a22ffbfc26f1b0

          SHA1

          13057c97a008216da1f9d726ca548d0efc46fb85

          SHA256

          d109a5ea193196274d789a51d11db7cfb6f6dcb0db95c2ca95b97fbb2fe1e6ff

          SHA512

          13b3d2897cbd6e39e7d5c7677aba4adeaccdc0f79ea58a3f405932ecb36832bb80afae9e80a3cdf66a8e6a985057450318971e1307448e1f2697cb7ef61fa23f

        • memory/1492-74-0x00000290E8F50000-0x00000290E8F60000-memory.dmp

          Filesize

          64KB

        • memory/1492-58-0x00000290E8E50000-0x00000290E8E60000-memory.dmp

          Filesize

          64KB

        • memory/2372-0-0x00000000005A0000-0x00000000005B5000-memory.dmp

          Filesize

          84KB

        • memory/2372-1-0x00000000021A0000-0x00000000021B3000-memory.dmp

          Filesize

          76KB

        • memory/2372-2-0x0000000000400000-0x000000000043F000-memory.dmp

          Filesize

          252KB

        • memory/2372-6-0x0000000000400000-0x000000000043F000-memory.dmp

          Filesize

          252KB

        • memory/2372-8-0x00000000021A0000-0x00000000021B3000-memory.dmp

          Filesize

          76KB

        • memory/2372-7-0x00000000005A0000-0x00000000005B5000-memory.dmp

          Filesize

          84KB

        • memory/4480-40-0x00000000021B0000-0x00000000021C0000-memory.dmp

          Filesize

          64KB

        • memory/4480-37-0x00000000021B0000-0x00000000021C0000-memory.dmp

          Filesize

          64KB

        • memory/4480-14-0x0000000000E00000-0x0000000000E15000-memory.dmp

          Filesize

          84KB

        • memory/4480-16-0x0000000000E00000-0x0000000000E15000-memory.dmp

          Filesize

          84KB

        • memory/4480-18-0x0000000000E00000-0x0000000000E15000-memory.dmp

          Filesize

          84KB

        • memory/4480-19-0x0000000002A00000-0x0000000002C0F000-memory.dmp

          Filesize

          2.1MB

        • memory/4480-22-0x0000000002A00000-0x0000000002C0F000-memory.dmp

          Filesize

          2.1MB

        • memory/4480-23-0x00000000021A0000-0x00000000021A6000-memory.dmp

          Filesize

          24KB

        • memory/4480-26-0x00000000021B0000-0x00000000021C0000-memory.dmp

          Filesize

          64KB

        • memory/4480-29-0x00000000021B0000-0x00000000021C0000-memory.dmp

          Filesize

          64KB

        • memory/4480-31-0x00000000021B0000-0x00000000021C0000-memory.dmp

          Filesize

          64KB

        • memory/4480-30-0x00000000021B0000-0x00000000021C0000-memory.dmp

          Filesize

          64KB

        • memory/4480-32-0x00000000021B0000-0x00000000021C0000-memory.dmp

          Filesize

          64KB

        • memory/4480-34-0x00000000021B0000-0x00000000021C0000-memory.dmp

          Filesize

          64KB

        • memory/4480-33-0x00000000021B0000-0x00000000021C0000-memory.dmp

          Filesize

          64KB

        • memory/4480-35-0x00000000021B0000-0x00000000021C0000-memory.dmp

          Filesize

          64KB

        • memory/4480-36-0x00000000021B0000-0x00000000021C0000-memory.dmp

          Filesize

          64KB

        • memory/4480-15-0x0000000000E00000-0x0000000000E15000-memory.dmp

          Filesize

          84KB

        • memory/4480-38-0x00000000021B0000-0x00000000021C0000-memory.dmp

          Filesize

          64KB

        • memory/4480-39-0x00000000021B0000-0x00000000021C0000-memory.dmp

          Filesize

          64KB

        • memory/4480-10-0x0000000000E00000-0x0000000000E15000-memory.dmp

          Filesize

          84KB

        • memory/4480-41-0x00000000021B0000-0x00000000021C0000-memory.dmp

          Filesize

          64KB

        • memory/4480-42-0x00000000021B0000-0x00000000021C0000-memory.dmp

          Filesize

          64KB

        • memory/4480-43-0x00000000021B0000-0x00000000021C0000-memory.dmp

          Filesize

          64KB

        • memory/4480-44-0x00000000021B0000-0x00000000021C0000-memory.dmp

          Filesize

          64KB

        • memory/4480-45-0x00000000021B0000-0x00000000021C0000-memory.dmp

          Filesize

          64KB

        • memory/4480-46-0x0000000002FD0000-0x0000000002FD5000-memory.dmp

          Filesize

          20KB

        • memory/4480-49-0x0000000002FD0000-0x0000000002FD5000-memory.dmp

          Filesize

          20KB

        • memory/4480-50-0x0000000007A00000-0x0000000007E0B000-memory.dmp

          Filesize

          4.0MB

        • memory/4480-53-0x0000000007A00000-0x0000000007E0B000-memory.dmp

          Filesize

          4.0MB

        • memory/4480-54-0x0000000002FE0000-0x0000000002FE7000-memory.dmp

          Filesize

          28KB

        • memory/4788-11-0x0000000000400000-0x000000000043F000-memory.dmp

          Filesize

          252KB

        • memory/4788-9-0x0000000000400000-0x000000000043F000-memory.dmp

          Filesize

          252KB