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
    03-09-2024 17:03

General

  • Target

    foufdsk.exe

  • Size

    11.2MB

  • MD5

    3482cbbb23d7548633dde35f128ea40a

  • SHA1

    b8cba7389b8e195b30ceb2e1a2b1d1fd6129adbd

  • SHA256

    8777baf9f5a68be1faf17fa6f7c5ab3de0113392784cc150b822b7db5426e380

  • SHA512

    db334c6aae52045ff3ce7597f172cce21f5a3a61a85b8dd4c5517eac649b60e429df968e1538c99080449d0ebfb5d8e917cb43bfa105e27d0a790ca2463748c7

  • SSDEEP

    6144:Oc6OZDisWsD0Td2HJxO+m8PuG1R4WnWjrsaz:O1OZDisvwdaxO0PuG1R4CWs

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.

  • 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\foufdsk.exe
    "C:\Users\Admin\AppData\Local\Temp\foufdsk.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4856
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\fyebfhbv\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4316
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ybuffopp.exe" C:\Windows\SysWOW64\fyebfhbv\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4192
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create fyebfhbv binPath= "C:\Windows\SysWOW64\fyebfhbv\ybuffopp.exe /d\"C:\Users\Admin\AppData\Local\Temp\foufdsk.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3184
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description fyebfhbv "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3632
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start fyebfhbv
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2680
    • 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:2932
  • C:\Windows\SysWOW64\fyebfhbv\ybuffopp.exe
    C:\Windows\SysWOW64\fyebfhbv\ybuffopp.exe /d"C:\Users\Admin\AppData\Local\Temp\foufdsk.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3996
    • 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:2456

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    14.4MB

    MD5

    f389534b64629833042ae2f9ae05ae4c

    SHA1

    467038d67960c766600d307f13c37be9ef4dac8b

    SHA256

    19e2c11869f04a7fffd78efd940e86965f4770104db71dbbb10317f11416eb78

    SHA512

    185f73c960b910d87f569531006820da219270cd6921ffd57a91c4cf7b684d41787cad563032141fa9a4f2886fb528ac78e70265459fd4664fc117798c1f3177

  • memory/2456-45-0x0000000002D20000-0x0000000002D30000-memory.dmp

    Filesize

    64KB

  • memory/2456-21-0x0000000002A00000-0x0000000002C0F000-memory.dmp

    Filesize

    2.1MB

  • memory/2456-24-0x0000000002D10000-0x0000000002D16000-memory.dmp

    Filesize

    24KB

  • memory/2456-42-0x0000000002D20000-0x0000000002D30000-memory.dmp

    Filesize

    64KB

  • memory/2456-32-0x0000000002D20000-0x0000000002D30000-memory.dmp

    Filesize

    64KB

  • memory/2456-44-0x0000000002D20000-0x0000000002D30000-memory.dmp

    Filesize

    64KB

  • memory/2456-54-0x0000000007A00000-0x0000000007E0B000-memory.dmp

    Filesize

    4.0MB

  • memory/2456-23-0x0000000002A00000-0x0000000002C0F000-memory.dmp

    Filesize

    2.1MB

  • memory/2456-43-0x0000000002D20000-0x0000000002D30000-memory.dmp

    Filesize

    64KB

  • memory/2456-27-0x0000000002D20000-0x0000000002D30000-memory.dmp

    Filesize

    64KB

  • memory/2456-17-0x0000000000E50000-0x0000000000E65000-memory.dmp

    Filesize

    84KB

  • memory/2456-18-0x0000000000E50000-0x0000000000E65000-memory.dmp

    Filesize

    84KB

  • memory/2456-47-0x0000000002FF0000-0x0000000002FF5000-memory.dmp

    Filesize

    20KB

  • memory/2456-55-0x0000000007F50000-0x0000000007F57000-memory.dmp

    Filesize

    28KB

  • memory/2456-51-0x0000000007A00000-0x0000000007E0B000-memory.dmp

    Filesize

    4.0MB

  • memory/2456-50-0x0000000002FF0000-0x0000000002FF5000-memory.dmp

    Filesize

    20KB

  • memory/2456-46-0x0000000002D20000-0x0000000002D30000-memory.dmp

    Filesize

    64KB

  • memory/2456-30-0x0000000002D20000-0x0000000002D30000-memory.dmp

    Filesize

    64KB

  • memory/2456-13-0x0000000000E50000-0x0000000000E65000-memory.dmp

    Filesize

    84KB

  • memory/2456-31-0x0000000002D20000-0x0000000002D30000-memory.dmp

    Filesize

    64KB

  • memory/2456-36-0x0000000002D20000-0x0000000002D30000-memory.dmp

    Filesize

    64KB

  • memory/2456-40-0x0000000002D20000-0x0000000002D30000-memory.dmp

    Filesize

    64KB

  • memory/2456-39-0x0000000002D20000-0x0000000002D30000-memory.dmp

    Filesize

    64KB

  • memory/2456-38-0x0000000002D20000-0x0000000002D30000-memory.dmp

    Filesize

    64KB

  • memory/2456-37-0x0000000002D20000-0x0000000002D30000-memory.dmp

    Filesize

    64KB

  • memory/2456-41-0x0000000002D20000-0x0000000002D30000-memory.dmp

    Filesize

    64KB

  • memory/2456-35-0x0000000002D20000-0x0000000002D30000-memory.dmp

    Filesize

    64KB

  • memory/2456-34-0x0000000002D20000-0x0000000002D30000-memory.dmp

    Filesize

    64KB

  • memory/2456-33-0x0000000002D20000-0x0000000002D30000-memory.dmp

    Filesize

    64KB

  • memory/3996-16-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/3996-11-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/3996-12-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/4856-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/4856-1-0x0000000000790000-0x0000000000890000-memory.dmp

    Filesize

    1024KB

  • memory/4856-8-0x0000000002340000-0x0000000002353000-memory.dmp

    Filesize

    76KB

  • memory/4856-9-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/4856-7-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/4856-2-0x0000000002340000-0x0000000002353000-memory.dmp

    Filesize

    76KB