Analysis

  • max time kernel
    149s
  • 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 16:42

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 5 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:448
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\mnoyxfaa\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2144
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ubezyssm.exe" C:\Windows\SysWOW64\mnoyxfaa\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:5028
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create mnoyxfaa binPath= "C:\Windows\SysWOW64\mnoyxfaa\ubezyssm.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:1432
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description mnoyxfaa "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2196
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start mnoyxfaa
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1580
    • 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:4208
  • C:\Windows\SysWOW64\mnoyxfaa\ubezyssm.exe
    C:\Windows\SysWOW64\mnoyxfaa\ubezyssm.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:2276
    • 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:2812

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    12.0MB

    MD5

    d229c97c39ce02aca79b8da17abcb79a

    SHA1

    5acb0c7afe90ba33a585b821c84603b317646d5b

    SHA256

    7964cda58f46278d9b2961bf3cf4c565e5eb4d3a0aa845157b6cef9b592f17fc

    SHA512

    005834e267f8594eb09582772830102e63d04f44ec3857b250a641122f21ee638f192b5509cfeb884aa24140771db48b3bf0d12df86e3317a17a122fee0b348d

  • memory/448-2-0x0000000002190000-0x00000000021A3000-memory.dmp

    Filesize

    76KB

  • memory/448-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/448-8-0x00000000006F0000-0x00000000007F0000-memory.dmp

    Filesize

    1024KB

  • memory/448-1-0x00000000006F0000-0x00000000007F0000-memory.dmp

    Filesize

    1024KB

  • memory/448-13-0x0000000002190000-0x00000000021A3000-memory.dmp

    Filesize

    76KB

  • memory/448-12-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/448-14-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/2276-15-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/2276-9-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/2812-65-0x0000000001DD0000-0x0000000001DD7000-memory.dmp

    Filesize

    28KB

  • memory/2812-53-0x0000000001CB0000-0x0000000001CC0000-memory.dmp

    Filesize

    64KB

  • memory/2812-17-0x0000000000F90000-0x0000000000FA5000-memory.dmp

    Filesize

    84KB

  • memory/2812-30-0x0000000003000000-0x000000000320F000-memory.dmp

    Filesize

    2.1MB

  • memory/2812-34-0x0000000001CA0000-0x0000000001CA6000-memory.dmp

    Filesize

    24KB

  • memory/2812-33-0x0000000003000000-0x000000000320F000-memory.dmp

    Filesize

    2.1MB

  • memory/2812-64-0x0000000007F00000-0x000000000830B000-memory.dmp

    Filesize

    4.0MB

  • memory/2812-52-0x0000000001CB0000-0x0000000001CC0000-memory.dmp

    Filesize

    64KB

  • memory/2812-10-0x0000000000F90000-0x0000000000FA5000-memory.dmp

    Filesize

    84KB

  • memory/2812-61-0x0000000007F00000-0x000000000830B000-memory.dmp

    Filesize

    4.0MB

  • memory/2812-60-0x0000000001DC0000-0x0000000001DC5000-memory.dmp

    Filesize

    20KB

  • memory/2812-57-0x0000000001DC0000-0x0000000001DC5000-memory.dmp

    Filesize

    20KB

  • memory/2812-56-0x0000000001CB0000-0x0000000001CC0000-memory.dmp

    Filesize

    64KB

  • memory/2812-55-0x0000000001CB0000-0x0000000001CC0000-memory.dmp

    Filesize

    64KB

  • memory/2812-54-0x0000000001CB0000-0x0000000001CC0000-memory.dmp

    Filesize

    64KB

  • memory/2812-16-0x0000000000F90000-0x0000000000FA5000-memory.dmp

    Filesize

    84KB

  • memory/2812-51-0x0000000001CB0000-0x0000000001CC0000-memory.dmp

    Filesize

    64KB

  • memory/2812-50-0x0000000001CB0000-0x0000000001CC0000-memory.dmp

    Filesize

    64KB

  • memory/2812-49-0x0000000001CB0000-0x0000000001CC0000-memory.dmp

    Filesize

    64KB

  • memory/2812-48-0x0000000001CB0000-0x0000000001CC0000-memory.dmp

    Filesize

    64KB

  • memory/2812-47-0x0000000001CB0000-0x0000000001CC0000-memory.dmp

    Filesize

    64KB

  • memory/2812-46-0x0000000001CB0000-0x0000000001CC0000-memory.dmp

    Filesize

    64KB

  • memory/2812-45-0x0000000001CB0000-0x0000000001CC0000-memory.dmp

    Filesize

    64KB

  • memory/2812-44-0x0000000001CB0000-0x0000000001CC0000-memory.dmp

    Filesize

    64KB

  • memory/2812-43-0x0000000001CB0000-0x0000000001CC0000-memory.dmp

    Filesize

    64KB

  • memory/2812-42-0x0000000001CB0000-0x0000000001CC0000-memory.dmp

    Filesize

    64KB

  • memory/2812-41-0x0000000001CB0000-0x0000000001CC0000-memory.dmp

    Filesize

    64KB

  • memory/2812-40-0x0000000001CB0000-0x0000000001CC0000-memory.dmp

    Filesize

    64KB

  • memory/2812-37-0x0000000001CB0000-0x0000000001CC0000-memory.dmp

    Filesize

    64KB