Analysis

  • max time kernel
    149s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    02/04/2024, 10:12

General

  • Target
    466a5771af26f4655cb6cfcf5616aa2acc11c58226bf440a7d0bb29f3a88968c.exe
  • Size 317KB
  • Sample240402-l8kdpaed5y
  • SHA256 466a5771af26f4655cb6cfcf5616aa2acc11c58226bf440a7d0bb29f3a88968c
  • MD5 SHA1 SHA512 SSDEEP

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 2 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).

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\466a5771af26f4655cb6cfcf5616aa2acc11c58226bf440a7d0bb29f3a88968c.exe
    "C:\Users\Admin\AppData\Local\Temp\466a5771af26f4655cb6cfcf5616aa2acc11c58226bf440a7d0bb29f3a88968c.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1852
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\upbmcfhh\
      2⤵
        PID:4816
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\mggyblpb.exe" C:\Windows\SysWOW64\upbmcfhh\
        2⤵
          PID:4544
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create upbmcfhh binPath= "C:\Windows\SysWOW64\upbmcfhh\mggyblpb.exe /d\"C:\Users\Admin\AppData\Local\Temp\466a5771af26f4655cb6cfcf5616aa2acc11c58226bf440a7d0bb29f3a88968c.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1624
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description upbmcfhh "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3360
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start upbmcfhh
          2⤵
          • Launches sc.exe
          PID:3972
        • 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:1456
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1852 -s 1300
          2⤵
          • Program crash
          PID:4428
      • C:\Windows\SysWOW64\upbmcfhh\mggyblpb.exe
        C:\Windows\SysWOW64\upbmcfhh\mggyblpb.exe /d"C:\Users\Admin\AppData\Local\Temp\466a5771af26f4655cb6cfcf5616aa2acc11c58226bf440a7d0bb29f3a88968c.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:752
        • 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:1348
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 752 -s 516
          2⤵
          • Program crash
          PID:768
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 1852 -ip 1852
        1⤵
          PID:4000
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 752 -ip 752
          1⤵
            PID:2280

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

                mggyblpb.exe

                • Path C:\Users\Admin\AppData\Local\Temp\mggyblpb.exe
                • Size 12.2MB
                • SHA256 9611d98f8af05e5ad72444ab6af51879dce3a2cb78d161378fde83db3a14b1d2
                • MD5 SHA1 SHA512 SSDEEP

                memory/752-14-0x0000000000400000-0x00000000007D9000-memory.dmp

                memory/752-12-0x0000000000940000-0x0000000000A40000-memory.dmp

                memory/1348-44-0x0000000001F90000-0x0000000001FA0000-memory.dmp

                memory/1348-40-0x0000000001F90000-0x0000000001FA0000-memory.dmp

                memory/1348-59-0x0000000000AC0000-0x0000000000AD5000-memory.dmp

                memory/1348-30-0x0000000001F90000-0x0000000001FA0000-memory.dmp

                memory/1348-10-0x0000000000AC0000-0x0000000000AD5000-memory.dmp

                memory/1348-18-0x0000000000AC0000-0x0000000000AD5000-memory.dmp

                memory/1348-16-0x0000000000AC0000-0x0000000000AD5000-memory.dmp

                memory/1348-15-0x0000000000AC0000-0x0000000000AD5000-memory.dmp

                memory/1348-31-0x0000000001F90000-0x0000000001FA0000-memory.dmp

                memory/1348-20-0x0000000002800000-0x0000000002A0F000-memory.dmp

                memory/1348-23-0x0000000002800000-0x0000000002A0F000-memory.dmp

                memory/1348-24-0x0000000001F80000-0x0000000001F86000-memory.dmp

                memory/1348-27-0x0000000001F90000-0x0000000001FA0000-memory.dmp

                memory/1348-35-0x0000000001F90000-0x0000000001FA0000-memory.dmp

                memory/1348-43-0x0000000001F90000-0x0000000001FA0000-memory.dmp

                memory/1348-32-0x0000000001F90000-0x0000000001FA0000-memory.dmp

                memory/1348-50-0x0000000001FE0000-0x0000000001FE5000-memory.dmp

                memory/1348-33-0x0000000001F90000-0x0000000001FA0000-memory.dmp

                memory/1348-37-0x0000000001F90000-0x0000000001FA0000-memory.dmp

                memory/1348-55-0x0000000001FF0000-0x0000000001FF7000-memory.dmp

                memory/1348-54-0x0000000007700000-0x0000000007B0B000-memory.dmp

                memory/1348-46-0x0000000001F90000-0x0000000001FA0000-memory.dmp

                memory/1348-45-0x0000000001F90000-0x0000000001FA0000-memory.dmp

                memory/1348-42-0x0000000001F90000-0x0000000001FA0000-memory.dmp

                memory/1348-41-0x0000000001F90000-0x0000000001FA0000-memory.dmp

                memory/1348-51-0x0000000007700000-0x0000000007B0B000-memory.dmp

                memory/1348-39-0x0000000001F90000-0x0000000001FA0000-memory.dmp

                memory/1348-38-0x0000000001F90000-0x0000000001FA0000-memory.dmp

                memory/1348-47-0x0000000001FE0000-0x0000000001FE5000-memory.dmp

                memory/1348-36-0x0000000001F90000-0x0000000001FA0000-memory.dmp

                memory/1348-34-0x0000000001F90000-0x0000000001FA0000-memory.dmp

                memory/1852-7-0x0000000000400000-0x00000000007D9000-memory.dmp

                memory/1852-2-0x0000000002530000-0x0000000002543000-memory.dmp

                memory/1852-1-0x0000000000B90000-0x0000000000C90000-memory.dmp

                memory/1852-4-0x0000000000400000-0x00000000007D9000-memory.dmp

                memory/1852-8-0x0000000002530000-0x0000000002543000-memory.dmp