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
    17-09-2024 10:45

General

  • Target

    369daa4e1bc4ec94f390bfaa316ebfa85ba5538c4e869030e63957c827fbcb94-dropped.exe

  • Size

    11.8MB

  • MD5

    af9f5adf151afef5a8c8378e1ea0799d

  • SHA1

    69ec980d31caf71bdc12cdc1f30bcb92c110a523

  • SHA256

    369daa4e1bc4ec94f390bfaa316ebfa85ba5538c4e869030e63957c827fbcb94

  • SHA512

    c80c35c561a64e82bd7388e1d64e95cf8bdc282869a5daa1d051dbdae613c982be341236114a6efd2769f0f3ef98aaeeba1b3bc489a2222fc72d3d282270d533

  • SSDEEP

    12288:ptfqkWH3ZIQqcggggggggggggggggggggggggggggggggggggggggggggggggggw:pY1HpLq

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.

  • 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
  • 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\369daa4e1bc4ec94f390bfaa316ebfa85ba5538c4e869030e63957c827fbcb94-dropped.exe
    "C:\Users\Admin\AppData\Local\Temp\369daa4e1bc4ec94f390bfaa316ebfa85ba5538c4e869030e63957c827fbcb94-dropped.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2144
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\qbzzdfuf\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4984
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\rlwylfnm.exe" C:\Windows\SysWOW64\qbzzdfuf\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3432
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create qbzzdfuf binPath= "C:\Windows\SysWOW64\qbzzdfuf\rlwylfnm.exe /d\"C:\Users\Admin\AppData\Local\Temp\369daa4e1bc4ec94f390bfaa316ebfa85ba5538c4e869030e63957c827fbcb94-dropped.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1968
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description qbzzdfuf "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3424
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start qbzzdfuf
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:60
    • 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:224
  • C:\Windows\SysWOW64\qbzzdfuf\rlwylfnm.exe
    C:\Windows\SysWOW64\qbzzdfuf\rlwylfnm.exe /d"C:\Users\Admin\AppData\Local\Temp\369daa4e1bc4ec94f390bfaa316ebfa85ba5538c4e869030e63957c827fbcb94-dropped.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:560
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Deletes itself
      • Drops file in System32 directory
      • System Location Discovery: System Language Discovery
      • Modifies data under HKEY_USERS
      PID:1180

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    12.9MB

    MD5

    967b3e286f8404a47aee5b2ba123b020

    SHA1

    b7628533325c77b5bd0274731b01e30f60a456fc

    SHA256

    1c10a70053b70066a1097d74d53bc24934e6138f1d8916c2588678520d8d4455

    SHA512

    213bc67a1dc140f070be9599280d48e7367486ec12d99bef23184307717f8c996a616c33975347957e70ee6f594e4751e474eb4e88f24809addaed88e306ef63

  • memory/560-12-0x0000000000400000-0x0000000002C6C000-memory.dmp

    Filesize

    40.4MB

  • memory/1180-41-0x0000000000E60000-0x0000000000E70000-memory.dmp

    Filesize

    64KB

  • memory/1180-32-0x0000000000E60000-0x0000000000E70000-memory.dmp

    Filesize

    64KB

  • memory/1180-21-0x00000000009F0000-0x00000000009F6000-memory.dmp

    Filesize

    24KB

  • memory/1180-40-0x0000000000E60000-0x0000000000E70000-memory.dmp

    Filesize

    64KB

  • memory/1180-18-0x0000000002A00000-0x0000000002C0F000-memory.dmp

    Filesize

    2.1MB

  • memory/1180-39-0x0000000000E60000-0x0000000000E70000-memory.dmp

    Filesize

    64KB

  • memory/1180-14-0x0000000000920000-0x0000000000935000-memory.dmp

    Filesize

    84KB

  • memory/1180-15-0x0000000000920000-0x0000000000935000-memory.dmp

    Filesize

    84KB

  • memory/1180-43-0x0000000000E60000-0x0000000000E70000-memory.dmp

    Filesize

    64KB

  • memory/1180-31-0x0000000000E60000-0x0000000000E70000-memory.dmp

    Filesize

    64KB

  • memory/1180-47-0x0000000000FD0000-0x0000000000FD5000-memory.dmp

    Filesize

    20KB

  • memory/1180-48-0x0000000007A00000-0x0000000007E0B000-memory.dmp

    Filesize

    4.0MB

  • memory/1180-52-0x0000000000FE0000-0x0000000000FE7000-memory.dmp

    Filesize

    28KB

  • memory/1180-51-0x0000000007A00000-0x0000000007E0B000-memory.dmp

    Filesize

    4.0MB

  • memory/1180-44-0x0000000000FD0000-0x0000000000FD5000-memory.dmp

    Filesize

    20KB

  • memory/1180-42-0x0000000000E60000-0x0000000000E70000-memory.dmp

    Filesize

    64KB

  • memory/1180-24-0x0000000000E60000-0x0000000000E70000-memory.dmp

    Filesize

    64KB

  • memory/1180-20-0x0000000002A00000-0x0000000002C0F000-memory.dmp

    Filesize

    2.1MB

  • memory/1180-11-0x0000000000920000-0x0000000000935000-memory.dmp

    Filesize

    84KB

  • memory/1180-38-0x0000000000E60000-0x0000000000E70000-memory.dmp

    Filesize

    64KB

  • memory/1180-37-0x0000000000E60000-0x0000000000E70000-memory.dmp

    Filesize

    64KB

  • memory/1180-36-0x0000000000E60000-0x0000000000E70000-memory.dmp

    Filesize

    64KB

  • memory/1180-35-0x0000000000E60000-0x0000000000E70000-memory.dmp

    Filesize

    64KB

  • memory/1180-34-0x0000000000E60000-0x0000000000E70000-memory.dmp

    Filesize

    64KB

  • memory/1180-33-0x0000000000E60000-0x0000000000E70000-memory.dmp

    Filesize

    64KB

  • memory/1180-27-0x0000000000E60000-0x0000000000E70000-memory.dmp

    Filesize

    64KB

  • memory/1180-30-0x0000000000E60000-0x0000000000E70000-memory.dmp

    Filesize

    64KB

  • memory/1180-29-0x0000000000E60000-0x0000000000E70000-memory.dmp

    Filesize

    64KB

  • memory/1180-28-0x0000000000E60000-0x0000000000E70000-memory.dmp

    Filesize

    64KB

  • memory/2144-4-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/2144-8-0x00000000049A0000-0x00000000049B3000-memory.dmp

    Filesize

    76KB

  • memory/2144-2-0x00000000049A0000-0x00000000049B3000-memory.dmp

    Filesize

    76KB

  • memory/2144-7-0x0000000000400000-0x0000000002C6C000-memory.dmp

    Filesize

    40.4MB

  • memory/2144-1-0x0000000002E00000-0x0000000002F00000-memory.dmp

    Filesize

    1024KB

  • memory/2144-9-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB