Analysis

  • max time kernel
    147s
  • max time network
    155s
  • 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

    aedba5939122af54e928bc355fbd3ffce10cc95f8d7efd007b8f9960d3c0cfe5.exe

  • Size

    256KB

  • MD5

    11d6fdab8ce0a4462699d12d8cc6e181

  • SHA1

    f79dd773636fb0c46346f08e9a36bea666e34350

  • SHA256

    aedba5939122af54e928bc355fbd3ffce10cc95f8d7efd007b8f9960d3c0cfe5

  • SHA512

    dd582a962bc9d3c50782a528a1c635d065530b96f7e1325d0c254f299b10b29218a8626b15f18b11aaf234b7393cea39d8025fa8d023fa9e79bdbdce2d6478a6

  • SSDEEP

    3072:DlrJL/wyRvNQG+FiOf5hqBNDo0Rpv01b8FbuW5hL4WeNH601:D3L/wUkFiOf5Ybon1gL4WeNa

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\aedba5939122af54e928bc355fbd3ffce10cc95f8d7efd007b8f9960d3c0cfe5.exe
    "C:\Users\Admin\AppData\Local\Temp\aedba5939122af54e928bc355fbd3ffce10cc95f8d7efd007b8f9960d3c0cfe5.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2592
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\myspyxua\
      2⤵
        PID:4728
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\odvchfkc.exe" C:\Windows\SysWOW64\myspyxua\
        2⤵
          PID:1960
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create myspyxua binPath= "C:\Windows\SysWOW64\myspyxua\odvchfkc.exe /d\"C:\Users\Admin\AppData\Local\Temp\aedba5939122af54e928bc355fbd3ffce10cc95f8d7efd007b8f9960d3c0cfe5.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 myspyxua "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1368
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start myspyxua
          2⤵
          • Launches sc.exe
          PID:3372
        • 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:1100
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2592 -s 1292
          2⤵
          • Program crash
          PID:2152
      • C:\Windows\SysWOW64\myspyxua\odvchfkc.exe
        C:\Windows\SysWOW64\myspyxua\odvchfkc.exe /d"C:\Users\Admin\AppData\Local\Temp\aedba5939122af54e928bc355fbd3ffce10cc95f8d7efd007b8f9960d3c0cfe5.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4140
        • 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:408
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4140 -s 512
          2⤵
          • Program crash
          PID:3452
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 2592 -ip 2592
        1⤵
          PID:4716
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 4140 -ip 4140
          1⤵
            PID:1280

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            12.0MB

            MD5

            42b0d4472f795c5510be2c941a78b6ac

            SHA1

            52e9978b56462f54fa22d84766250d6131d1b58a

            SHA256

            39f1627566abf167d55a7ef84d8012c736fa9cbf7e0d8e5b54bcbd25d16f21f7

            SHA512

            50f042e61c456ef48b8f4112ad119a02eef9452cb8da49e4828af8f8d37081fe176e500f1c64dc46477ced9745b63a26cfbbd4b817d170abcf25942abea9ca61

          • memory/408-32-0x0000000002D10000-0x0000000002D20000-memory.dmp

            Filesize

            64KB

          • memory/408-55-0x0000000002FF0000-0x0000000002FF7000-memory.dmp

            Filesize

            28KB

          • memory/408-59-0x0000000000E40000-0x0000000000E55000-memory.dmp

            Filesize

            84KB

          • memory/408-35-0x0000000002D10000-0x0000000002D20000-memory.dmp

            Filesize

            64KB

          • memory/408-54-0x0000000007A00000-0x0000000007E0B000-memory.dmp

            Filesize

            4.0MB

          • memory/408-11-0x0000000000E40000-0x0000000000E55000-memory.dmp

            Filesize

            84KB

          • memory/408-51-0x0000000007A00000-0x0000000007E0B000-memory.dmp

            Filesize

            4.0MB

          • memory/408-50-0x0000000002FE0000-0x0000000002FE5000-memory.dmp

            Filesize

            20KB

          • memory/408-33-0x0000000002D10000-0x0000000002D20000-memory.dmp

            Filesize

            64KB

          • memory/408-47-0x0000000002FE0000-0x0000000002FE5000-memory.dmp

            Filesize

            20KB

          • memory/408-18-0x0000000000E40000-0x0000000000E55000-memory.dmp

            Filesize

            84KB

          • memory/408-20-0x0000000002A00000-0x0000000002C0F000-memory.dmp

            Filesize

            2.1MB

          • memory/408-23-0x0000000002A00000-0x0000000002C0F000-memory.dmp

            Filesize

            2.1MB

          • memory/408-24-0x00000000021F0000-0x00000000021F6000-memory.dmp

            Filesize

            24KB

          • memory/408-27-0x0000000002D10000-0x0000000002D20000-memory.dmp

            Filesize

            64KB

          • memory/408-31-0x0000000002D10000-0x0000000002D20000-memory.dmp

            Filesize

            64KB

          • memory/408-30-0x0000000002D10000-0x0000000002D20000-memory.dmp

            Filesize

            64KB

          • memory/408-46-0x0000000002D10000-0x0000000002D20000-memory.dmp

            Filesize

            64KB

          • memory/408-16-0x0000000000E40000-0x0000000000E55000-memory.dmp

            Filesize

            84KB

          • memory/408-43-0x0000000002D10000-0x0000000002D20000-memory.dmp

            Filesize

            64KB

          • memory/408-41-0x0000000002D10000-0x0000000002D20000-memory.dmp

            Filesize

            64KB

          • memory/408-36-0x0000000002D10000-0x0000000002D20000-memory.dmp

            Filesize

            64KB

          • memory/408-37-0x0000000002D10000-0x0000000002D20000-memory.dmp

            Filesize

            64KB

          • memory/408-38-0x0000000002D10000-0x0000000002D20000-memory.dmp

            Filesize

            64KB

          • memory/408-39-0x0000000002D10000-0x0000000002D20000-memory.dmp

            Filesize

            64KB

          • memory/408-34-0x0000000002D10000-0x0000000002D20000-memory.dmp

            Filesize

            64KB

          • memory/408-40-0x0000000002D10000-0x0000000002D20000-memory.dmp

            Filesize

            64KB

          • memory/408-42-0x0000000002D10000-0x0000000002D20000-memory.dmp

            Filesize

            64KB

          • memory/408-44-0x0000000002D10000-0x0000000002D20000-memory.dmp

            Filesize

            64KB

          • memory/408-45-0x0000000002D10000-0x0000000002D20000-memory.dmp

            Filesize

            64KB

          • memory/2592-4-0x0000000000400000-0x0000000000862000-memory.dmp

            Filesize

            4.4MB

          • memory/2592-1-0x0000000000B10000-0x0000000000C10000-memory.dmp

            Filesize

            1024KB

          • memory/2592-9-0x0000000000AD0000-0x0000000000AE3000-memory.dmp

            Filesize

            76KB

          • memory/2592-8-0x0000000000400000-0x0000000000862000-memory.dmp

            Filesize

            4.4MB

          • memory/2592-2-0x0000000000AD0000-0x0000000000AE3000-memory.dmp

            Filesize

            76KB

          • memory/4140-17-0x0000000000400000-0x0000000000862000-memory.dmp

            Filesize

            4.4MB

          • memory/4140-10-0x0000000000A50000-0x0000000000B50000-memory.dmp

            Filesize

            1024KB

          • memory/4140-12-0x0000000000400000-0x0000000000862000-memory.dmp

            Filesize

            4.4MB