Analysis

  • max time kernel
    149s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03-10-2024 02:10

General

  • Target

    8f068c21f73b64644779c6d31a47f4014ad4dbf0d958cd3fb673b6617ca6e2ecN.exe

  • Size

    71KB

  • MD5

    ea08cac77aa15c1742504a58c8f00180

  • SHA1

    f7b023d2a29ca6c19ed669e0f73c8f5f84dc4379

  • SHA256

    8f068c21f73b64644779c6d31a47f4014ad4dbf0d958cd3fb673b6617ca6e2ec

  • SHA512

    303bc40c4e06c4479260b42c9ea9b8f38502a0dd3f98de06767762690978d49bdefa12c370151a9338996109f7dea8a2140ae28837b884ed65287f42b0ebefa3

  • SSDEEP

    1536:Dkes21VCy1nTxSYg3CXTjFWL9o5dpIHUc:DDVCyFxSYACXFppI0

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
  • Looks up external IP address via web service 3 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • 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\8f068c21f73b64644779c6d31a47f4014ad4dbf0d958cd3fb673b6617ca6e2ecN.exe
    "C:\Users\Admin\AppData\Local\Temp\8f068c21f73b64644779c6d31a47f4014ad4dbf0d958cd3fb673b6617ca6e2ecN.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:948
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\goypfgl\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3816
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\bzjkmilr.exe" C:\Windows\SysWOW64\goypfgl\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4032
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create goypfgl binPath= "C:\Windows\SysWOW64\goypfgl\bzjkmilr.exe /d\"C:\Users\Admin\AppData\Local\Temp\8f068c21f73b64644779c6d31a47f4014ad4dbf0d958cd3fb673b6617ca6e2ecN.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4072
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description goypfgl "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:736
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start goypfgl
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3632
    • 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:1624
  • C:\Windows\SysWOW64\goypfgl\bzjkmilr.exe
    C:\Windows\SysWOW64\goypfgl\bzjkmilr.exe /d"C:\Users\Admin\AppData\Local\Temp\8f068c21f73b64644779c6d31a47f4014ad4dbf0d958cd3fb673b6617ca6e2ecN.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4956
    • 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:4308

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

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

    Filesize

    11.5MB

    MD5

    f4ef508a6084d8367f14a67ed55741ef

    SHA1

    ec9a44b19bfecec64ff20fcf0481b294095c8dd3

    SHA256

    13b581fe920c0f3af9910bee4ff46b25b42f7458523d2b777d4e92bad346443e

    SHA512

    9ba7278bf062bdac04c1b17d15ba362c444af52f3e3eb1989708ae73f49d1152eee254fddac45093110828e50ef38df9b280c061d1b3de9c512eb210206443c9

  • memory/4308-3-0x0000000000CE0000-0x0000000000CF5000-memory.dmp

    Filesize

    84KB

  • memory/4308-6-0x0000000000CE0000-0x0000000000CF5000-memory.dmp

    Filesize

    84KB

  • memory/4308-7-0x0000000000CE0000-0x0000000000CF5000-memory.dmp

    Filesize

    84KB

  • memory/4308-8-0x0000000000CE0000-0x0000000000CF5000-memory.dmp

    Filesize

    84KB

  • memory/4308-10-0x0000000000CE0000-0x0000000000CF5000-memory.dmp

    Filesize

    84KB

  • memory/4308-23-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/4308-12-0x0000000002A00000-0x0000000002C0F000-memory.dmp

    Filesize

    2.1MB

  • memory/4308-15-0x0000000002190000-0x0000000002196000-memory.dmp

    Filesize

    24KB

  • memory/4308-42-0x0000000007900000-0x0000000007D0B000-memory.dmp

    Filesize

    4.0MB

  • memory/4308-45-0x0000000007900000-0x0000000007D0B000-memory.dmp

    Filesize

    4.0MB

  • memory/4308-41-0x00000000021F0000-0x00000000021F5000-memory.dmp

    Filesize

    20KB

  • memory/4308-38-0x00000000021F0000-0x00000000021F5000-memory.dmp

    Filesize

    20KB

  • memory/4308-37-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/4308-35-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/4308-36-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/4308-34-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/4308-33-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/4308-32-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/4308-31-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/4308-30-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/4308-29-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/4308-28-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/4308-27-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/4308-26-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/4308-25-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/4308-24-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/4308-22-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/4308-21-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/4308-18-0x00000000021A0000-0x00000000021B0000-memory.dmp

    Filesize

    64KB

  • memory/4308-14-0x0000000002A00000-0x0000000002C0F000-memory.dmp

    Filesize

    2.1MB

  • memory/4308-46-0x0000000002DD0000-0x0000000002DD7000-memory.dmp

    Filesize

    28KB