Analysis

  • max time kernel
    147s
  • max time network
    150s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240802-en
  • resource tags

    arch:x64arch:x86image:win11-20240802-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    05-09-2024 04:46

General

  • Target

    743e88ce351815e356e3605246222b8076c5ea5e79bc0a9c5304504a67818ac8.exe

  • Size

    424KB

  • MD5

    f50413dcad54999b078491cda8cc97eb

  • SHA1

    b9757f71c4c63cdfdcd4b4e7e81343d2140fb97b

  • SHA256

    743e88ce351815e356e3605246222b8076c5ea5e79bc0a9c5304504a67818ac8

  • SHA512

    2ea5bd66f9365d7dfd14fe1a03234e02c17353e0f8d94316d7c15bb533444e68132f3de3b48ca366d147f0a21d4665730f00c9ae5d6981330680f9d31b03e74a

  • SSDEEP

    6144:xb7/BJsZfVjljXIJLprKi7Skl1QoRXZYsoS7ZD17T4kXwA:xXBJsZfVjlrgLND7SG1QyvH7T4k

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) 2 TTPs
  • Modifies Windows Firewall 2 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • 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).

  • Event Triggered Execution: Netsh Helper DLL 1 TTPs 3 IoCs

    Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

  • Program crash 2 IoCs
  • System Location Discovery: System Language Discovery 1 TTPs 9 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\743e88ce351815e356e3605246222b8076c5ea5e79bc0a9c5304504a67818ac8.exe
    "C:\Users\Admin\AppData\Local\Temp\743e88ce351815e356e3605246222b8076c5ea5e79bc0a9c5304504a67818ac8.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2868
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\smqswquj\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2356
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\lxnaonfj.exe" C:\Windows\SysWOW64\smqswquj\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2748
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create smqswquj binPath= "C:\Windows\SysWOW64\smqswquj\lxnaonfj.exe /d\"C:\Users\Admin\AppData\Local\Temp\743e88ce351815e356e3605246222b8076c5ea5e79bc0a9c5304504a67818ac8.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3028
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description smqswquj "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2040
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start smqswquj
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4136
    • 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
      • Event Triggered Execution: Netsh Helper DLL
      • System Location Discovery: System Language Discovery
      PID:756
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2868 -s 1096
      2⤵
      • Program crash
      PID:4532
  • C:\Windows\SysWOW64\smqswquj\lxnaonfj.exe
    C:\Windows\SysWOW64\smqswquj\lxnaonfj.exe /d"C:\Users\Admin\AppData\Local\Temp\743e88ce351815e356e3605246222b8076c5ea5e79bc0a9c5304504a67818ac8.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4560
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Deletes itself
      • Drops file in System32 directory
      • System Location Discovery: System Language Discovery
      • Modifies data under HKEY_USERS
      PID:2856
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4560 -s 548
      2⤵
      • Program crash
      PID:728
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 2868 -ip 2868
    1⤵
      PID:3412
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 528 -p 4560 -ip 4560
      1⤵
        PID:4168

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        10.3MB

        MD5

        0703fa1e7b00ff97a4b2a191ae2988fc

        SHA1

        bde24bb1e2288b6ba999f92d71436b53e62b8a61

        SHA256

        5f12dc9123c4ab6425606f972f217e93adac6c4c53ad66e467efab043d254eb1

        SHA512

        b443e1f1893285b6d5ad6994250040950280a71952527ad4bd94098ad4ed1b5d124a0f5aed3d9cc18e071dfe6f6755edf5dd52978917bc6b1636a56a51e8b9de

      • memory/2856-46-0x00000000021E0000-0x00000000021F0000-memory.dmp

        Filesize

        64KB

      • memory/2856-21-0x0000000002A00000-0x0000000002C0F000-memory.dmp

        Filesize

        2.1MB

      • memory/2856-54-0x0000000007A00000-0x0000000007E0B000-memory.dmp

        Filesize

        4.0MB

      • memory/2856-44-0x00000000021E0000-0x00000000021F0000-memory.dmp

        Filesize

        64KB

      • memory/2856-23-0x0000000002A00000-0x0000000002C0F000-memory.dmp

        Filesize

        2.1MB

      • memory/2856-24-0x00000000011F0000-0x00000000011F6000-memory.dmp

        Filesize

        24KB

      • memory/2856-13-0x0000000000B60000-0x0000000000B75000-memory.dmp

        Filesize

        84KB

      • memory/2856-27-0x00000000021E0000-0x00000000021F0000-memory.dmp

        Filesize

        64KB

      • memory/2856-45-0x00000000021E0000-0x00000000021F0000-memory.dmp

        Filesize

        64KB

      • memory/2856-30-0x00000000021E0000-0x00000000021F0000-memory.dmp

        Filesize

        64KB

      • memory/2856-16-0x0000000000B60000-0x0000000000B75000-memory.dmp

        Filesize

        84KB

      • memory/2856-31-0x00000000021E0000-0x00000000021F0000-memory.dmp

        Filesize

        64KB

      • memory/2856-40-0x00000000021E0000-0x00000000021F0000-memory.dmp

        Filesize

        64KB

      • memory/2856-55-0x0000000002FD0000-0x0000000002FD7000-memory.dmp

        Filesize

        28KB

      • memory/2856-51-0x0000000007A00000-0x0000000007E0B000-memory.dmp

        Filesize

        4.0MB

      • memory/2856-50-0x00000000021F0000-0x00000000021F5000-memory.dmp

        Filesize

        20KB

      • memory/2856-47-0x00000000021F0000-0x00000000021F5000-memory.dmp

        Filesize

        20KB

      • memory/2856-32-0x00000000021E0000-0x00000000021F0000-memory.dmp

        Filesize

        64KB

      • memory/2856-15-0x0000000000B60000-0x0000000000B75000-memory.dmp

        Filesize

        84KB

      • memory/2856-33-0x00000000021E0000-0x00000000021F0000-memory.dmp

        Filesize

        64KB

      • memory/2856-37-0x00000000021E0000-0x00000000021F0000-memory.dmp

        Filesize

        64KB

      • memory/2856-42-0x00000000021E0000-0x00000000021F0000-memory.dmp

        Filesize

        64KB

      • memory/2856-41-0x00000000021E0000-0x00000000021F0000-memory.dmp

        Filesize

        64KB

      • memory/2856-39-0x00000000021E0000-0x00000000021F0000-memory.dmp

        Filesize

        64KB

      • memory/2856-38-0x00000000021E0000-0x00000000021F0000-memory.dmp

        Filesize

        64KB

      • memory/2856-43-0x00000000021E0000-0x00000000021F0000-memory.dmp

        Filesize

        64KB

      • memory/2856-36-0x00000000021E0000-0x00000000021F0000-memory.dmp

        Filesize

        64KB

      • memory/2856-35-0x00000000021E0000-0x00000000021F0000-memory.dmp

        Filesize

        64KB

      • memory/2856-34-0x00000000021E0000-0x00000000021F0000-memory.dmp

        Filesize

        64KB

      • memory/2868-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/2868-1-0x00000000007C0000-0x00000000008C0000-memory.dmp

        Filesize

        1024KB

      • memory/2868-8-0x0000000000790000-0x00000000007A3000-memory.dmp

        Filesize

        76KB

      • memory/2868-7-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB

      • memory/2868-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/2868-2-0x0000000000790000-0x00000000007A3000-memory.dmp

        Filesize

        76KB

      • memory/4560-18-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB

      • memory/4560-11-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB

      • memory/4560-12-0x0000000000400000-0x00000000005FE000-memory.dmp

        Filesize

        2.0MB