Analysis

  • max time kernel
    147s
  • max time network
    147s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    16-01-2025 16:46

General

  • Target

    tofsee.exe

  • Size

    12.3MB

  • MD5

    25d2b9e890383de8e4c54531aec432dd

  • SHA1

    ccaa3021da481652aa28104eeb8af59a2ebb7ac7

  • SHA256

    50c458863b680d4b1c852fe9b6367c9a1fd6008ba4bd149f08ea71c8b06c2cb6

  • SHA512

    452991b58c1ef0d52f1971771a4fe01ce85dee5ee23d59adfdec703df4f5ec76a691fd6b4d3cd88a93736c14a886bd1df8825360efad8e2c99595dc4a4d3feb4

  • SSDEEP

    6144:peeISXLAQ4G5g0RVOppo6xI4JbDva0uRjMgUgWWWWWWWWWWWWWWWWWWWWWWWWWWn:pzbXMG5goCfDva5RQg

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

jotunheim.name

Signatures

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • Tofsee family
  • 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.

  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 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.

  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\tofsee.exe
    "C:\Users\Admin\AppData\Local\Temp\tofsee.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2720
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\jlnlfwac\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3948
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\rhjwnfq.exe" C:\Windows\SysWOW64\jlnlfwac\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:456
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create jlnlfwac binPath= "C:\Windows\SysWOW64\jlnlfwac\rhjwnfq.exe /d\"C:\Users\Admin\AppData\Local\Temp\tofsee.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3932
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description jlnlfwac "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3584
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start jlnlfwac
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4848
    • 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:4072
  • C:\Windows\SysWOW64\jlnlfwac\rhjwnfq.exe
    C:\Windows\SysWOW64\jlnlfwac\rhjwnfq.exe /d"C:\Users\Admin\AppData\Local\Temp\tofsee.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3112
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Deletes itself
      • System Location Discovery: System Language Discovery
      PID:3452

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    11.6MB

    MD5

    3a6af36f62a06945ac9d6087c94d3e63

    SHA1

    192fb55575c0b616c0754c4986962fd62995a8ac

    SHA256

    bb754b303b82a865673ea654dd8aac944f190cbec9a946bc0c85612808e7c28a

    SHA512

    b0a8ade93f8cd2e96df174fc2fbb3f0fce8f413925fefa9a7fd37dc3f9d58245094006ec5b54e67a8b34f34c08777008199c4ca44c99dedf73eccfb468d9939b

  • memory/2720-8-0x0000000000400000-0x000000000045D000-memory.dmp

    Filesize

    372KB

  • memory/2720-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/2720-2-0x0000000000570000-0x0000000000583000-memory.dmp

    Filesize

    76KB

  • memory/2720-10-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/2720-9-0x0000000000570000-0x0000000000583000-memory.dmp

    Filesize

    76KB

  • memory/2720-1-0x0000000000720000-0x0000000000820000-memory.dmp

    Filesize

    1024KB

  • memory/3112-11-0x0000000000400000-0x000000000045D000-memory.dmp

    Filesize

    372KB

  • memory/3112-12-0x0000000000400000-0x000000000045D000-memory.dmp

    Filesize

    372KB

  • memory/3112-13-0x0000000000400000-0x000000000045D000-memory.dmp

    Filesize

    372KB

  • memory/3112-16-0x0000000000400000-0x000000000045D000-memory.dmp

    Filesize

    372KB

  • memory/3452-14-0x0000000000BE0000-0x0000000000BF5000-memory.dmp

    Filesize

    84KB

  • memory/3452-18-0x0000000000BE0000-0x0000000000BF5000-memory.dmp

    Filesize

    84KB

  • memory/3452-19-0x0000000000BE0000-0x0000000000BF5000-memory.dmp

    Filesize

    84KB