Analysis

  • max time kernel
    148s
  • max time network
    157s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230915-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
  • submitted
    10/10/2023, 22:25

General

  • Target

    file.exe

  • Size

    244KB

  • MD5

    f023769573e084a1a0aa48dab8693129

  • SHA1

    3bd541268680ea336e5cb5a7b27c66486783eaaf

  • SHA256

    7db866599ec9d72e0c32c99a97e14f7780e17b85cdc51780b97d435a87b1940e

  • SHA512

    2dfa4ac2f9abbad29881dbcee5ac637f57b3be343746f7f0a0d8c5589a21b31f1302a5cf0d975f6c6c90e0106913ea3f8edf74047938429497c5ee34ba22c52a

  • SSDEEP

    3072:6Xr0Y35f0Mj9P6JB6YmbmW2MH/rzJHyg1bX/kJ6528CxbYT8p:a4Mf99P6JBTyhfrsg1uHbYT8

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).

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 5 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:872
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yqcthquq\
      2⤵
        PID:4544
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\amurxkqo.exe" C:\Windows\SysWOW64\yqcthquq\
        2⤵
          PID:1532
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create yqcthquq binPath= "C:\Windows\SysWOW64\yqcthquq\amurxkqo.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2264
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description yqcthquq "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4488
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start yqcthquq
          2⤵
          • Launches sc.exe
          PID:4252
        • 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:3156
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 872 -s 1052
          2⤵
          • Program crash
          PID:3888
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 872 -ip 872
        1⤵
          PID:1788
        • C:\Windows\SysWOW64\yqcthquq\amurxkqo.exe
          C:\Windows\SysWOW64\yqcthquq\amurxkqo.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:1880
          • 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:3856
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 1880 -s 536
            2⤵
            • Program crash
            PID:2272
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 508 -p 1880 -ip 1880
          1⤵
            PID:5076

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            10.3MB

            MD5

            937f7245453899a6953d876702e5717c

            SHA1

            64c0a5775188742f9d469ba5d2fbb1dd46b60108

            SHA256

            70c6fcebd7c4b89ed1e596a08096abb922e25a9ee5961e381d04228055cb40ae

            SHA512

            c996e31cf61fcff95a1b7bf3d203b1300ecf9ca2d3367f0b1b82f77118c71f506f95e047c0666bd6f3eaf0cf35692fbd5a36d5a509e3c0fc40b69e31457efffa

          • C:\Windows\SysWOW64\yqcthquq\amurxkqo.exe

            Filesize

            10.3MB

            MD5

            937f7245453899a6953d876702e5717c

            SHA1

            64c0a5775188742f9d469ba5d2fbb1dd46b60108

            SHA256

            70c6fcebd7c4b89ed1e596a08096abb922e25a9ee5961e381d04228055cb40ae

            SHA512

            c996e31cf61fcff95a1b7bf3d203b1300ecf9ca2d3367f0b1b82f77118c71f506f95e047c0666bd6f3eaf0cf35692fbd5a36d5a509e3c0fc40b69e31457efffa

          • memory/872-1-0x00000000021B0000-0x00000000021C3000-memory.dmp

            Filesize

            76KB

          • memory/872-2-0x0000000000400000-0x000000000044A000-memory.dmp

            Filesize

            296KB

          • memory/872-6-0x0000000000400000-0x000000000044A000-memory.dmp

            Filesize

            296KB

          • memory/872-8-0x00000000006F0000-0x0000000000705000-memory.dmp

            Filesize

            84KB

          • memory/872-9-0x00000000021B0000-0x00000000021C3000-memory.dmp

            Filesize

            76KB

          • memory/872-0-0x00000000006F0000-0x0000000000705000-memory.dmp

            Filesize

            84KB

          • memory/1880-17-0x0000000000400000-0x000000000044A000-memory.dmp

            Filesize

            296KB

          • memory/1880-10-0x0000000000400000-0x000000000044A000-memory.dmp

            Filesize

            296KB

          • memory/3856-32-0x00000000019C0000-0x00000000019D0000-memory.dmp

            Filesize

            64KB

          • memory/3856-37-0x00000000019C0000-0x00000000019D0000-memory.dmp

            Filesize

            64KB

          • memory/3856-15-0x00000000004F0000-0x0000000000505000-memory.dmp

            Filesize

            84KB

          • memory/3856-19-0x00000000004F0000-0x0000000000505000-memory.dmp

            Filesize

            84KB

          • memory/3856-20-0x0000000002200000-0x000000000240F000-memory.dmp

            Filesize

            2.1MB

          • memory/3856-23-0x0000000002200000-0x000000000240F000-memory.dmp

            Filesize

            2.1MB

          • memory/3856-24-0x00000000019B0000-0x00000000019B6000-memory.dmp

            Filesize

            24KB

          • memory/3856-27-0x00000000019C0000-0x00000000019D0000-memory.dmp

            Filesize

            64KB

          • memory/3856-30-0x00000000019C0000-0x00000000019D0000-memory.dmp

            Filesize

            64KB

          • memory/3856-31-0x00000000019C0000-0x00000000019D0000-memory.dmp

            Filesize

            64KB

          • memory/3856-11-0x00000000004F0000-0x0000000000505000-memory.dmp

            Filesize

            84KB

          • memory/3856-33-0x00000000019C0000-0x00000000019D0000-memory.dmp

            Filesize

            64KB

          • memory/3856-34-0x00000000019C0000-0x00000000019D0000-memory.dmp

            Filesize

            64KB

          • memory/3856-35-0x00000000019C0000-0x00000000019D0000-memory.dmp

            Filesize

            64KB

          • memory/3856-36-0x00000000019C0000-0x00000000019D0000-memory.dmp

            Filesize

            64KB

          • memory/3856-16-0x00000000004F0000-0x0000000000505000-memory.dmp

            Filesize

            84KB

          • memory/3856-40-0x00000000019C0000-0x00000000019D0000-memory.dmp

            Filesize

            64KB

          • memory/3856-38-0x00000000019C0000-0x00000000019D0000-memory.dmp

            Filesize

            64KB

          • memory/3856-39-0x00000000019C0000-0x00000000019D0000-memory.dmp

            Filesize

            64KB

          • memory/3856-42-0x00000000019C0000-0x00000000019D0000-memory.dmp

            Filesize

            64KB

          • memory/3856-41-0x00000000019C0000-0x00000000019D0000-memory.dmp

            Filesize

            64KB

          • memory/3856-43-0x00000000019C0000-0x00000000019D0000-memory.dmp

            Filesize

            64KB

          • memory/3856-44-0x00000000019C0000-0x00000000019D0000-memory.dmp

            Filesize

            64KB

          • memory/3856-46-0x00000000019C0000-0x00000000019D0000-memory.dmp

            Filesize

            64KB

          • memory/3856-47-0x00000000019D0000-0x00000000019D5000-memory.dmp

            Filesize

            20KB

          • memory/3856-45-0x00000000019C0000-0x00000000019D0000-memory.dmp

            Filesize

            64KB

          • memory/3856-50-0x00000000019D0000-0x00000000019D5000-memory.dmp

            Filesize

            20KB

          • memory/3856-51-0x0000000007100000-0x000000000750B000-memory.dmp

            Filesize

            4.0MB

          • memory/3856-54-0x0000000007100000-0x000000000750B000-memory.dmp

            Filesize

            4.0MB

          • memory/3856-55-0x00000000019E0000-0x00000000019E7000-memory.dmp

            Filesize

            28KB