Analysis

  • max time kernel
    147s
  • max time network
    154s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240802-en
  • resource tags

    arch:x64arch:x86image:win11-20240802-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    06/09/2024, 14:17

General

  • Target
    c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe
  • Size 213KB
  • Sample240906-rl745a1arm
  • SHA256 c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5
  • 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) 2 TTPs
  • Modifies Windows Firewall 2 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 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.

  • 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\c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe
    "C:\Users\Admin\AppData\Local\Temp\c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:860
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\nuhubwum\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2248
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\jhwexnie.exe" C:\Windows\SysWOW64\nuhubwum\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4584
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create nuhubwum binPath= "C:\Windows\SysWOW64\nuhubwum\jhwexnie.exe /d\"C:\Users\Admin\AppData\Local\Temp\c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.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 nuhubwum "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3076
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start nuhubwum
      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\nuhubwum\jhwexnie.exe
    C:\Windows\SysWOW64\nuhubwum\jhwexnie.exe /d"C:\Users\Admin\AppData\Local\Temp\c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:104
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Drops file in System32 directory
      • System Location Discovery: System Language Discovery
      • Modifies data under HKEY_USERS
      PID:2080

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        jhwexnie.exe

        • Path C:\Users\Admin\AppData\Local\Temp\jhwexnie.exe
        • Size 11.6MB
        • SHA256 77db18fb5ea930565f5dd8b8aba162cb6dc7d7154f2463155342557ada4e77c1
        • MD5 SHA1 SHA512 SSDEEP

        memory/104-14-0x0000000000400000-0x000000000043C000-memory.dmp

        memory/860-2-0x0000000002290000-0x00000000022A3000-memory.dmp

        memory/860-3-0x0000000000400000-0x0000000000415000-memory.dmp

        memory/860-7-0x00000000006F0000-0x00000000007F0000-memory.dmp

        memory/860-1-0x00000000006F0000-0x00000000007F0000-memory.dmp

        memory/860-11-0x0000000000400000-0x000000000043C000-memory.dmp

        memory/860-12-0x0000000002290000-0x00000000022A3000-memory.dmp

        memory/860-13-0x0000000000400000-0x0000000000415000-memory.dmp

        memory/2080-48-0x0000000002DD0000-0x0000000002DD5000-memory.dmp

        memory/2080-42-0x00000000021F0000-0x0000000002200000-memory.dmp

        memory/2080-17-0x0000000000C70000-0x0000000000C85000-memory.dmp

        memory/2080-56-0x0000000002DE0000-0x0000000002DE7000-memory.dmp

        memory/2080-41-0x00000000021F0000-0x0000000002200000-memory.dmp

        memory/2080-21-0x0000000002A00000-0x0000000002C0F000-memory.dmp

        memory/2080-55-0x0000000007900000-0x0000000007D0B000-memory.dmp

        memory/2080-52-0x0000000007900000-0x0000000007D0B000-memory.dmp

        memory/2080-51-0x0000000002DD0000-0x0000000002DD5000-memory.dmp

        memory/2080-9-0x0000000000C70000-0x0000000000C85000-memory.dmp

        memory/2080-47-0x00000000021F0000-0x0000000002200000-memory.dmp

        memory/2080-46-0x00000000021F0000-0x0000000002200000-memory.dmp

        memory/2080-45-0x00000000021F0000-0x0000000002200000-memory.dmp

        memory/2080-44-0x00000000021F0000-0x0000000002200000-memory.dmp

        memory/2080-43-0x00000000021F0000-0x0000000002200000-memory.dmp

        memory/2080-16-0x0000000000C70000-0x0000000000C85000-memory.dmp

        memory/2080-40-0x00000000021F0000-0x0000000002200000-memory.dmp

        memory/2080-39-0x00000000021F0000-0x0000000002200000-memory.dmp

        memory/2080-38-0x00000000021F0000-0x0000000002200000-memory.dmp

        memory/2080-37-0x00000000021F0000-0x0000000002200000-memory.dmp

        memory/2080-36-0x00000000021F0000-0x0000000002200000-memory.dmp

        memory/2080-35-0x00000000021F0000-0x0000000002200000-memory.dmp

        memory/2080-34-0x00000000021F0000-0x0000000002200000-memory.dmp

        memory/2080-33-0x00000000021F0000-0x0000000002200000-memory.dmp

        memory/2080-32-0x00000000021F0000-0x0000000002200000-memory.dmp

        memory/2080-31-0x00000000021F0000-0x0000000002200000-memory.dmp

        memory/2080-28-0x00000000021F0000-0x0000000002200000-memory.dmp

        memory/2080-24-0x0000000002A00000-0x0000000002C0F000-memory.dmp

        memory/2080-25-0x0000000000DF0000-0x0000000000DF6000-memory.dmp