Analysis

  • max time kernel
    146s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    06/09/2024, 14:29

General

  • Target
    RSno9EH0K9.exe
  • Size 213KB
  • Sample240906-rtknsssblg
  • 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
  • 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).

  • 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 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\RSno9EH0K9.exe
    "C:\Users\Admin\AppData\Local\Temp\RSno9EH0K9.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4888
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yjeldppu\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3624
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\wiuzwcbp.exe" C:\Windows\SysWOW64\yjeldppu\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4292
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create yjeldppu binPath= "C:\Windows\SysWOW64\yjeldppu\wiuzwcbp.exe /d\"C:\Users\Admin\AppData\Local\Temp\RSno9EH0K9.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1268
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description yjeldppu "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4128
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start yjeldppu
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3720
    • 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:5032
  • C:\Windows\SysWOW64\yjeldppu\wiuzwcbp.exe
    C:\Windows\SysWOW64\yjeldppu\wiuzwcbp.exe /d"C:\Users\Admin\AppData\Local\Temp\RSno9EH0K9.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2204
    • 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:1984

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        wiuzwcbp.exe

        • Path C:\Users\Admin\AppData\Local\Temp\wiuzwcbp.exe
        • Size 10.9MB
        • SHA256 edd397da4cc65ce524ba17141a62d311d00fac3e9dcbd5f1bc0a68e0c78024d6
        • MD5 SHA1 SHA512 SSDEEP

        memory/1984-40-0x0000000000BF0000-0x0000000000C00000-memory.dmp

        memory/1984-47-0x0000000000BF0000-0x0000000000C00000-memory.dmp

        memory/1984-22-0x0000000002800000-0x0000000002A0F000-memory.dmp

        memory/1984-26-0x0000000000B90000-0x0000000000B96000-memory.dmp

        memory/1984-29-0x0000000000BF0000-0x0000000000C00000-memory.dmp

        memory/1984-32-0x0000000000BF0000-0x0000000000C00000-memory.dmp

        memory/1984-12-0x0000000000AB0000-0x0000000000AC5000-memory.dmp

        memory/1984-33-0x0000000000BF0000-0x0000000000C00000-memory.dmp

        memory/1984-34-0x0000000000BF0000-0x0000000000C00000-memory.dmp

        memory/1984-46-0x0000000000BF0000-0x0000000000C00000-memory.dmp

        memory/1984-17-0x0000000000AB0000-0x0000000000AC5000-memory.dmp

        memory/1984-18-0x0000000000AB0000-0x0000000000AC5000-memory.dmp

        memory/1984-25-0x0000000002800000-0x0000000002A0F000-memory.dmp

        memory/1984-57-0x0000000001FE0000-0x0000000001FE7000-memory.dmp

        memory/1984-56-0x0000000007700000-0x0000000007B0B000-memory.dmp

        memory/1984-53-0x0000000007700000-0x0000000007B0B000-memory.dmp

        memory/1984-52-0x0000000001FD0000-0x0000000001FD5000-memory.dmp

        memory/1984-49-0x0000000001FD0000-0x0000000001FD5000-memory.dmp

        memory/1984-35-0x0000000000BF0000-0x0000000000C00000-memory.dmp

        memory/1984-48-0x0000000000BF0000-0x0000000000C00000-memory.dmp

        memory/1984-36-0x0000000000BF0000-0x0000000000C00000-memory.dmp

        memory/1984-45-0x0000000000BF0000-0x0000000000C00000-memory.dmp

        memory/1984-44-0x0000000000BF0000-0x0000000000C00000-memory.dmp

        memory/1984-43-0x0000000000BF0000-0x0000000000C00000-memory.dmp

        memory/1984-42-0x0000000000BF0000-0x0000000000C00000-memory.dmp

        memory/1984-41-0x0000000000BF0000-0x0000000000C00000-memory.dmp

        memory/1984-37-0x0000000000BF0000-0x0000000000C00000-memory.dmp

        memory/1984-39-0x0000000000BF0000-0x0000000000C00000-memory.dmp

        memory/1984-38-0x0000000000BF0000-0x0000000000C00000-memory.dmp

        memory/2204-15-0x0000000000400000-0x000000000043C000-memory.dmp

        memory/2204-10-0x0000000000400000-0x000000000043C000-memory.dmp

        memory/4888-1-0x0000000000440000-0x0000000000540000-memory.dmp

        memory/4888-3-0x0000000000400000-0x0000000000415000-memory.dmp

        memory/4888-14-0x0000000000400000-0x0000000000415000-memory.dmp

        memory/4888-11-0x0000000002050000-0x0000000002063000-memory.dmp

        memory/4888-7-0x0000000000400000-0x000000000043C000-memory.dmp

        memory/4888-8-0x0000000000440000-0x0000000000540000-memory.dmp

        memory/4888-2-0x0000000002050000-0x0000000002063000-memory.dmp