Analysis

  • max time kernel
    150s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240412-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-04-2024 13:19

General

  • Target

    04ec244112b44e9592f9c5e45ab50e67e402f0704d8121678afe46117de90482.exe

  • Size

    233KB

  • MD5

    f81a2c93c44bfec11cdd55eb53dde5df

  • SHA1

    45cb3d7066113e86fff081e309265a797af0ef51

  • SHA256

    04ec244112b44e9592f9c5e45ab50e67e402f0704d8121678afe46117de90482

  • SHA512

    c9fc2a6239235aa0bf24e700665666c8500000bcc76dc8e26922f8cfc0f961949bf7fa04bf9877ea3254b9a5879752d1b3f75d945318c246770b507bc0b0199e

  • SSDEEP

    3072:LefNGJ/ceeYkb2BNog9oADOF4t0wC0NnpXIpKjVEqLDOO7n+MnIitmjXO9ZJwVQk:Le1GM+NobFm0wC0NpYpuVEqSFOTF

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 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\04ec244112b44e9592f9c5e45ab50e67e402f0704d8121678afe46117de90482.exe
    "C:\Users\Admin\AppData\Local\Temp\04ec244112b44e9592f9c5e45ab50e67e402f0704d8121678afe46117de90482.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2936
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\utuvmymr\
      2⤵
        PID:3736
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\mgljeheg.exe" C:\Windows\SysWOW64\utuvmymr\
        2⤵
          PID:876
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create utuvmymr binPath= "C:\Windows\SysWOW64\utuvmymr\mgljeheg.exe /d\"C:\Users\Admin\AppData\Local\Temp\04ec244112b44e9592f9c5e45ab50e67e402f0704d8121678afe46117de90482.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4384
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description utuvmymr "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1680
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start utuvmymr
          2⤵
          • Launches sc.exe
          PID:4408
        • 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:1524
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2936 -s 1028
          2⤵
          • Program crash
          PID:2648
      • C:\Windows\SysWOW64\utuvmymr\mgljeheg.exe
        C:\Windows\SysWOW64\utuvmymr\mgljeheg.exe /d"C:\Users\Admin\AppData\Local\Temp\04ec244112b44e9592f9c5e45ab50e67e402f0704d8121678afe46117de90482.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3412
        • 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:3156
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3412 -s 560
          2⤵
          • Program crash
          PID:2148
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 3412 -ip 3412
        1⤵
          PID:1724
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 2936 -ip 2936
          1⤵
            PID:1612

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Local\Temp\mgljeheg.exe
            Filesize

            13.1MB

            MD5

            98cdf2307c6983de05c4530f0f6ca669

            SHA1

            870a68703abbb87fc403c2816102ad6a6282d24a

            SHA256

            bc43872308d962bc80b0b99cf5406c0d57321084c5e4515e0e18e94ee139aa14

            SHA512

            f7987ba124e0b5880dce77447d84c6aba9817dcd5b9196ab66ed48516b97e1799b014f0bb9ee2825e13ded3d4027632e5b39d4f5c641199c690cc63f907d4f74

          • memory/2936-16-0x0000000000400000-0x000000000043F000-memory.dmp
            Filesize

            252KB

          • memory/2936-2-0x00000000021A0000-0x00000000021B3000-memory.dmp
            Filesize

            76KB

          • memory/2936-3-0x0000000000400000-0x000000000043F000-memory.dmp
            Filesize

            252KB

          • memory/2936-1-0x0000000000700000-0x0000000000800000-memory.dmp
            Filesize

            1024KB

          • memory/3156-33-0x0000000001F80000-0x0000000001F90000-memory.dmp
            Filesize

            64KB

          • memory/3156-35-0x0000000001F80000-0x0000000001F90000-memory.dmp
            Filesize

            64KB

          • memory/3156-11-0x00000000009C0000-0x00000000009D5000-memory.dmp
            Filesize

            84KB

          • memory/3156-14-0x00000000009C0000-0x00000000009D5000-memory.dmp
            Filesize

            84KB

          • memory/3156-59-0x00000000009C0000-0x00000000009D5000-memory.dmp
            Filesize

            84KB

          • memory/3156-55-0x0000000001FE0000-0x0000000001FE7000-memory.dmp
            Filesize

            28KB

          • memory/3156-17-0x00000000009C0000-0x00000000009D5000-memory.dmp
            Filesize

            84KB

          • memory/3156-18-0x00000000009C0000-0x00000000009D5000-memory.dmp
            Filesize

            84KB

          • memory/3156-20-0x0000000002800000-0x0000000002A0F000-memory.dmp
            Filesize

            2.1MB

          • memory/3156-23-0x0000000002800000-0x0000000002A0F000-memory.dmp
            Filesize

            2.1MB

          • memory/3156-24-0x0000000001F70000-0x0000000001F76000-memory.dmp
            Filesize

            24KB

          • memory/3156-27-0x0000000001F80000-0x0000000001F90000-memory.dmp
            Filesize

            64KB

          • memory/3156-31-0x0000000001F80000-0x0000000001F90000-memory.dmp
            Filesize

            64KB

          • memory/3156-30-0x0000000001F80000-0x0000000001F90000-memory.dmp
            Filesize

            64KB

          • memory/3156-32-0x0000000001F80000-0x0000000001F90000-memory.dmp
            Filesize

            64KB

          • memory/3156-54-0x0000000007800000-0x0000000007C0B000-memory.dmp
            Filesize

            4.0MB

          • memory/3156-36-0x0000000001F80000-0x0000000001F90000-memory.dmp
            Filesize

            64KB

          • memory/3156-51-0x0000000007800000-0x0000000007C0B000-memory.dmp
            Filesize

            4.0MB

          • memory/3156-38-0x0000000001F80000-0x0000000001F90000-memory.dmp
            Filesize

            64KB

          • memory/3156-37-0x0000000001F80000-0x0000000001F90000-memory.dmp
            Filesize

            64KB

          • memory/3156-34-0x0000000001F80000-0x0000000001F90000-memory.dmp
            Filesize

            64KB

          • memory/3156-39-0x0000000001F80000-0x0000000001F90000-memory.dmp
            Filesize

            64KB

          • memory/3156-40-0x0000000001F80000-0x0000000001F90000-memory.dmp
            Filesize

            64KB

          • memory/3156-41-0x0000000001F80000-0x0000000001F90000-memory.dmp
            Filesize

            64KB

          • memory/3156-42-0x0000000001F80000-0x0000000001F90000-memory.dmp
            Filesize

            64KB

          • memory/3156-43-0x0000000001F80000-0x0000000001F90000-memory.dmp
            Filesize

            64KB

          • memory/3156-44-0x0000000001F80000-0x0000000001F90000-memory.dmp
            Filesize

            64KB

          • memory/3156-45-0x0000000001F80000-0x0000000001F90000-memory.dmp
            Filesize

            64KB

          • memory/3156-46-0x0000000001F80000-0x0000000001F90000-memory.dmp
            Filesize

            64KB

          • memory/3156-47-0x0000000001FD0000-0x0000000001FD5000-memory.dmp
            Filesize

            20KB

          • memory/3156-50-0x0000000001FD0000-0x0000000001FD5000-memory.dmp
            Filesize

            20KB

          • memory/3412-10-0x0000000000400000-0x000000000043F000-memory.dmp
            Filesize

            252KB

          • memory/3412-8-0x00000000007D0000-0x00000000008D0000-memory.dmp
            Filesize

            1024KB

          • memory/3412-9-0x00000000007A0000-0x00000000007B3000-memory.dmp
            Filesize

            76KB

          • memory/3412-15-0x0000000000400000-0x000000000043F000-memory.dmp
            Filesize

            252KB