Analysis

  • max time kernel
    150s
  • 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 12:51

General

  • Target

    8f6bbc692073146dfc23b5743a53d2abc158831b64964de5ec6a15cf573bf8d3.exe

  • Size

    213KB

  • MD5

    9ad5cb5878facd1f519325f68cb408a1

  • SHA1

    64450bf9e67e5001835661493053e6ce67cc42b5

  • SHA256

    8f6bbc692073146dfc23b5743a53d2abc158831b64964de5ec6a15cf573bf8d3

  • SHA512

    5a45b850989000c24a25ac27a4ca3480bfed933912e7add4834f5c443486240d60d9a56a5418ca43ac0888898072de72cb029dfb29105560192937d10a93b0bd

  • SSDEEP

    6144:1DDXnqPnz5vSel6TKC1onDZ/MU0Vdh1HQ:1XXq/z5vSNKC1onDSVdz

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 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\8f6bbc692073146dfc23b5743a53d2abc158831b64964de5ec6a15cf573bf8d3.exe
    "C:\Users\Admin\AppData\Local\Temp\8f6bbc692073146dfc23b5743a53d2abc158831b64964de5ec6a15cf573bf8d3.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2960
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\tcwhzggl\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4380
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\lxnaonfj.exe" C:\Windows\SysWOW64\tcwhzggl\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4696
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create tcwhzggl binPath= "C:\Windows\SysWOW64\tcwhzggl\lxnaonfj.exe /d\"C:\Users\Admin\AppData\Local\Temp\8f6bbc692073146dfc23b5743a53d2abc158831b64964de5ec6a15cf573bf8d3.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:904
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description tcwhzggl "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3648
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start tcwhzggl
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3524
    • 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:1284
  • C:\Windows\SysWOW64\tcwhzggl\lxnaonfj.exe
    C:\Windows\SysWOW64\tcwhzggl\lxnaonfj.exe /d"C:\Users\Admin\AppData\Local\Temp\8f6bbc692073146dfc23b5743a53d2abc158831b64964de5ec6a15cf573bf8d3.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4284
    • 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:2692

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

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

    Filesize

    13.4MB

    MD5

    c3a772b6b2a74100e4bda93f0c303692

    SHA1

    d1ef15c91e78d4e9d843f0b45a076db2e9c56c90

    SHA256

    60cfc77767d3a24bc555fe7718133c02497c5e52b30cae0e5fa0782530026b8f

    SHA512

    ca76cb9ea5740fd7aaca6c8a3e295b7a308d66e874cc0870198e113257120b0972d3f560505d026dc5d8f7dd5df00009e53d1455647cd70e192850049d2b32a8

  • memory/2692-49-0x0000000002F20000-0x0000000002F30000-memory.dmp

    Filesize

    64KB

  • memory/2692-40-0x0000000002F20000-0x0000000002F30000-memory.dmp

    Filesize

    64KB

  • memory/2692-57-0x0000000007C00000-0x000000000800B000-memory.dmp

    Filesize

    4.0MB

  • memory/2692-50-0x00000000031F0000-0x00000000031F5000-memory.dmp

    Filesize

    20KB

  • memory/2692-30-0x0000000002F20000-0x0000000002F30000-memory.dmp

    Filesize

    64KB

  • memory/2692-33-0x0000000002F20000-0x0000000002F30000-memory.dmp

    Filesize

    64KB

  • memory/2692-34-0x0000000002F20000-0x0000000002F30000-memory.dmp

    Filesize

    64KB

  • memory/2692-36-0x0000000002F20000-0x0000000002F30000-memory.dmp

    Filesize

    64KB

  • memory/2692-37-0x0000000002F20000-0x0000000002F30000-memory.dmp

    Filesize

    64KB

  • memory/2692-14-0x0000000001050000-0x0000000001065000-memory.dmp

    Filesize

    84KB

  • memory/2692-38-0x0000000002F20000-0x0000000002F30000-memory.dmp

    Filesize

    64KB

  • memory/2692-18-0x0000000001050000-0x0000000001065000-memory.dmp

    Filesize

    84KB

  • memory/2692-19-0x0000000001050000-0x0000000001065000-memory.dmp

    Filesize

    84KB

  • memory/2692-48-0x0000000002F20000-0x0000000002F30000-memory.dmp

    Filesize

    64KB

  • memory/2692-23-0x0000000002C00000-0x0000000002E0F000-memory.dmp

    Filesize

    2.1MB

  • memory/2692-58-0x0000000008150000-0x0000000008157000-memory.dmp

    Filesize

    28KB

  • memory/2692-54-0x0000000007C00000-0x000000000800B000-memory.dmp

    Filesize

    4.0MB

  • memory/2692-53-0x00000000031F0000-0x00000000031F5000-memory.dmp

    Filesize

    20KB

  • memory/2692-27-0x0000000002F10000-0x0000000002F16000-memory.dmp

    Filesize

    24KB

  • memory/2692-35-0x0000000002F20000-0x0000000002F30000-memory.dmp

    Filesize

    64KB

  • memory/2692-26-0x0000000002C00000-0x0000000002E0F000-memory.dmp

    Filesize

    2.1MB

  • memory/2692-47-0x0000000002F20000-0x0000000002F30000-memory.dmp

    Filesize

    64KB

  • memory/2692-46-0x0000000002F20000-0x0000000002F30000-memory.dmp

    Filesize

    64KB

  • memory/2692-45-0x0000000002F20000-0x0000000002F30000-memory.dmp

    Filesize

    64KB

  • memory/2692-44-0x0000000002F20000-0x0000000002F30000-memory.dmp

    Filesize

    64KB

  • memory/2692-43-0x0000000002F20000-0x0000000002F30000-memory.dmp

    Filesize

    64KB

  • memory/2692-42-0x0000000002F20000-0x0000000002F30000-memory.dmp

    Filesize

    64KB

  • memory/2692-41-0x0000000002F20000-0x0000000002F30000-memory.dmp

    Filesize

    64KB

  • memory/2692-39-0x0000000002F20000-0x0000000002F30000-memory.dmp

    Filesize

    64KB

  • memory/2960-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/2960-13-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/2960-1-0x00000000004D0000-0x00000000005D0000-memory.dmp

    Filesize

    1024KB

  • memory/2960-10-0x00000000005D0000-0x00000000005E3000-memory.dmp

    Filesize

    76KB

  • memory/2960-8-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/2960-7-0x00000000004D0000-0x00000000005D0000-memory.dmp

    Filesize

    1024KB

  • memory/2960-2-0x00000000005D0000-0x00000000005E3000-memory.dmp

    Filesize

    76KB

  • memory/4284-16-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/4284-12-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/4284-11-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB