Analysis

  • max time kernel
    150s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    05-09-2024 10:39

General

  • Target

    743e88ce351815e356e3605246222b8076c5ea5e79bc0a9c5304504a67818ac8.exe

  • Size

    424KB

  • MD5

    f50413dcad54999b078491cda8cc97eb

  • SHA1

    b9757f71c4c63cdfdcd4b4e7e81343d2140fb97b

  • SHA256

    743e88ce351815e356e3605246222b8076c5ea5e79bc0a9c5304504a67818ac8

  • SHA512

    2ea5bd66f9365d7dfd14fe1a03234e02c17353e0f8d94316d7c15bb533444e68132f3de3b48ca366d147f0a21d4665730f00c9ae5d6981330680f9d31b03e74a

  • SSDEEP

    6144:xb7/BJsZfVjljXIJLprKi7Skl1QoRXZYsoS7ZD17T4kXwA:xXBJsZfVjlrgLND7SG1QyvH7T4k

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\743e88ce351815e356e3605246222b8076c5ea5e79bc0a9c5304504a67818ac8.exe
    "C:\Users\Admin\AppData\Local\Temp\743e88ce351815e356e3605246222b8076c5ea5e79bc0a9c5304504a67818ac8.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4916
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\jamoilea\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:116
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\gnuxmatd.exe" C:\Windows\SysWOW64\jamoilea\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1916
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create jamoilea binPath= "C:\Windows\SysWOW64\jamoilea\gnuxmatd.exe /d\"C:\Users\Admin\AppData\Local\Temp\743e88ce351815e356e3605246222b8076c5ea5e79bc0a9c5304504a67818ac8.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4952
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description jamoilea "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4400
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start jamoilea
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3620
    • 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:3108
  • C:\Windows\SysWOW64\jamoilea\gnuxmatd.exe
    C:\Windows\SysWOW64\jamoilea\gnuxmatd.exe /d"C:\Users\Admin\AppData\Local\Temp\743e88ce351815e356e3605246222b8076c5ea5e79bc0a9c5304504a67818ac8.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3676
    • 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:640

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    13.7MB

    MD5

    a6d2ef4fbf331fa4b1f3d737be926ed3

    SHA1

    eb6778f676978f960f02836ba01ae4191601b6a8

    SHA256

    9d6bebf1c14bdb517f8c62d34649c1d49c34d0e9936eee4566aeabb04d3d5857

    SHA512

    e4231bf5b515618522358437ab28828600c147a78b8c27f7ccc6cd4113ee809596e775c83c7670e3857b6206bdcbf236007de8b8f5ac93c20253d0f733ade943

  • memory/640-34-0x0000000000CA0000-0x0000000000CB0000-memory.dmp

    Filesize

    64KB

  • memory/640-32-0x0000000000CA0000-0x0000000000CB0000-memory.dmp

    Filesize

    64KB

  • memory/640-55-0x00000000027E0000-0x00000000027E7000-memory.dmp

    Filesize

    28KB

  • memory/640-42-0x0000000000CA0000-0x0000000000CB0000-memory.dmp

    Filesize

    64KB

  • memory/640-24-0x00000000007F0000-0x00000000007F6000-memory.dmp

    Filesize

    24KB

  • memory/640-27-0x0000000000CA0000-0x0000000000CB0000-memory.dmp

    Filesize

    64KB

  • memory/640-21-0x0000000002200000-0x000000000240F000-memory.dmp

    Filesize

    2.1MB

  • memory/640-13-0x0000000000670000-0x0000000000685000-memory.dmp

    Filesize

    84KB

  • memory/640-43-0x0000000000CA0000-0x0000000000CB0000-memory.dmp

    Filesize

    64KB

  • memory/640-15-0x0000000000670000-0x0000000000685000-memory.dmp

    Filesize

    84KB

  • memory/640-31-0x0000000000CA0000-0x0000000000CB0000-memory.dmp

    Filesize

    64KB

  • memory/640-18-0x0000000000670000-0x0000000000685000-memory.dmp

    Filesize

    84KB

  • memory/640-52-0x0000000007240000-0x000000000764B000-memory.dmp

    Filesize

    4.0MB

  • memory/640-50-0x00000000027D0000-0x00000000027D5000-memory.dmp

    Filesize

    20KB

  • memory/640-47-0x00000000027D0000-0x00000000027D5000-memory.dmp

    Filesize

    20KB

  • memory/640-46-0x0000000000CA0000-0x0000000000CB0000-memory.dmp

    Filesize

    64KB

  • memory/640-45-0x0000000000CA0000-0x0000000000CB0000-memory.dmp

    Filesize

    64KB

  • memory/640-44-0x0000000000CA0000-0x0000000000CB0000-memory.dmp

    Filesize

    64KB

  • memory/640-39-0x0000000000CA0000-0x0000000000CB0000-memory.dmp

    Filesize

    64KB

  • memory/640-54-0x0000000007240000-0x000000000764B000-memory.dmp

    Filesize

    4.0MB

  • memory/640-35-0x0000000000CA0000-0x0000000000CB0000-memory.dmp

    Filesize

    64KB

  • memory/640-40-0x0000000000CA0000-0x0000000000CB0000-memory.dmp

    Filesize

    64KB

  • memory/640-38-0x0000000000CA0000-0x0000000000CB0000-memory.dmp

    Filesize

    64KB

  • memory/640-37-0x0000000000CA0000-0x0000000000CB0000-memory.dmp

    Filesize

    64KB

  • memory/640-36-0x0000000000CA0000-0x0000000000CB0000-memory.dmp

    Filesize

    64KB

  • memory/640-41-0x0000000000CA0000-0x0000000000CB0000-memory.dmp

    Filesize

    64KB

  • memory/640-23-0x0000000002200000-0x000000000240F000-memory.dmp

    Filesize

    2.1MB

  • memory/640-33-0x0000000000CA0000-0x0000000000CB0000-memory.dmp

    Filesize

    64KB

  • memory/640-30-0x0000000000CA0000-0x0000000000CB0000-memory.dmp

    Filesize

    64KB

  • memory/3676-16-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/3676-12-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/3676-11-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/4916-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/4916-2-0x00000000021F0000-0x0000000002203000-memory.dmp

    Filesize

    76KB

  • memory/4916-8-0x00000000021F0000-0x0000000002203000-memory.dmp

    Filesize

    76KB

  • memory/4916-9-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/4916-7-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/4916-1-0x0000000000730000-0x0000000000830000-memory.dmp

    Filesize

    1024KB