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
    03-09-2024 15:42

General

  • Target

    8a0875e84aba045a27b735aaf816acb898359820ac0382aa76e32606192b01e8.exe

  • Size

    423KB

  • MD5

    5e8fb462e0765bfb0df856d1f935eb2d

  • SHA1

    51eb283017b44ab8f0c3f8c5ce7e0d9662ebcafd

  • SHA256

    8a0875e84aba045a27b735aaf816acb898359820ac0382aa76e32606192b01e8

  • SHA512

    2a6696b5305ef2d3e8e2adf8f6a9f0d3d88e839e36e3cd38ad5254f3dcc157ce5618590bb1e5e5fa8f91460f18b6ed4c958a6aa8d4486a298e68cfc2be284e2d

  • SSDEEP

    6144:2atMBDDhWsqnwG4fA5BEivtQ9rqh+eUOrPotfV:2AMBDDhvqwG95BEi1iqh+UwD

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\8a0875e84aba045a27b735aaf816acb898359820ac0382aa76e32606192b01e8.exe
    "C:\Users\Admin\AppData\Local\Temp\8a0875e84aba045a27b735aaf816acb898359820ac0382aa76e32606192b01e8.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4784
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\afkrkznw\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2948
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\jmjctvpf.exe" C:\Windows\SysWOW64\afkrkznw\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2728
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create afkrkznw binPath= "C:\Windows\SysWOW64\afkrkznw\jmjctvpf.exe /d\"C:\Users\Admin\AppData\Local\Temp\8a0875e84aba045a27b735aaf816acb898359820ac0382aa76e32606192b01e8.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4968
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description afkrkznw "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4412
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start afkrkznw
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1300
    • 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:3044
  • C:\Windows\SysWOW64\afkrkznw\jmjctvpf.exe
    C:\Windows\SysWOW64\afkrkznw\jmjctvpf.exe /d"C:\Users\Admin\AppData\Local\Temp\8a0875e84aba045a27b735aaf816acb898359820ac0382aa76e32606192b01e8.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4176
    • 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:2852

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    14.8MB

    MD5

    0dd80ab0906b60be7bc020980651c44d

    SHA1

    e949bed4ffb1b3f99a17eed22c46b26e225703d4

    SHA256

    577c604c6f07b62c3734f104e8fad3e6f3c2483c221e9bfa4a72aa91ddeef3d0

    SHA512

    36938a4197d5bdfb4d340c457f3c35b22e8c44f102c4fd0ea90e55aad6fea84ad62e0bbc790ac001d124117eb20e74bde8c0ab838f2cadfa659664c42f5f315a

  • memory/2852-54-0x0000000007000000-0x000000000740B000-memory.dmp

    Filesize

    4.0MB

  • memory/2852-38-0x0000000000AB0000-0x0000000000AC0000-memory.dmp

    Filesize

    64KB

  • memory/2852-55-0x00000000025D0000-0x00000000025D7000-memory.dmp

    Filesize

    28KB

  • memory/2852-47-0x00000000017F0000-0x00000000017F5000-memory.dmp

    Filesize

    20KB

  • memory/2852-27-0x0000000000AB0000-0x0000000000AC0000-memory.dmp

    Filesize

    64KB

  • memory/2852-30-0x0000000000AB0000-0x0000000000AC0000-memory.dmp

    Filesize

    64KB

  • memory/2852-31-0x0000000000AB0000-0x0000000000AC0000-memory.dmp

    Filesize

    64KB

  • memory/2852-12-0x00000000001D0000-0x00000000001E5000-memory.dmp

    Filesize

    84KB

  • memory/2852-50-0x00000000017F0000-0x00000000017F5000-memory.dmp

    Filesize

    20KB

  • memory/2852-32-0x0000000000AB0000-0x0000000000AC0000-memory.dmp

    Filesize

    64KB

  • memory/2852-34-0x0000000000AB0000-0x0000000000AC0000-memory.dmp

    Filesize

    64KB

  • memory/2852-18-0x00000000001D0000-0x00000000001E5000-memory.dmp

    Filesize

    84KB

  • memory/2852-37-0x0000000000AB0000-0x0000000000AC0000-memory.dmp

    Filesize

    64KB

  • memory/2852-33-0x0000000000AB0000-0x0000000000AC0000-memory.dmp

    Filesize

    64KB

  • memory/2852-20-0x0000000002000000-0x000000000220F000-memory.dmp

    Filesize

    2.1MB

  • memory/2852-24-0x0000000000AA0000-0x0000000000AA6000-memory.dmp

    Filesize

    24KB

  • memory/2852-51-0x0000000007000000-0x000000000740B000-memory.dmp

    Filesize

    4.0MB

  • memory/2852-35-0x0000000000AB0000-0x0000000000AC0000-memory.dmp

    Filesize

    64KB

  • memory/2852-17-0x00000000001D0000-0x00000000001E5000-memory.dmp

    Filesize

    84KB

  • memory/2852-23-0x0000000002000000-0x000000000220F000-memory.dmp

    Filesize

    2.1MB

  • memory/2852-41-0x0000000000AB0000-0x0000000000AC0000-memory.dmp

    Filesize

    64KB

  • memory/2852-45-0x0000000000AB0000-0x0000000000AC0000-memory.dmp

    Filesize

    64KB

  • memory/2852-44-0x0000000000AB0000-0x0000000000AC0000-memory.dmp

    Filesize

    64KB

  • memory/2852-43-0x0000000000AB0000-0x0000000000AC0000-memory.dmp

    Filesize

    64KB

  • memory/2852-42-0x0000000000AB0000-0x0000000000AC0000-memory.dmp

    Filesize

    64KB

  • memory/2852-46-0x0000000000AB0000-0x0000000000AC0000-memory.dmp

    Filesize

    64KB

  • memory/2852-40-0x0000000000AB0000-0x0000000000AC0000-memory.dmp

    Filesize

    64KB

  • memory/2852-39-0x0000000000AB0000-0x0000000000AC0000-memory.dmp

    Filesize

    64KB

  • memory/2852-36-0x0000000000AB0000-0x0000000000AC0000-memory.dmp

    Filesize

    64KB

  • memory/4176-14-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/4176-15-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/4176-11-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/4784-4-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/4784-1-0x0000000000700000-0x0000000000800000-memory.dmp

    Filesize

    1024KB

  • memory/4784-8-0x00000000006D0000-0x00000000006E3000-memory.dmp

    Filesize

    76KB

  • memory/4784-9-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/4784-7-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/4784-2-0x00000000006D0000-0x00000000006E3000-memory.dmp

    Filesize

    76KB