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
    04/09/2024, 13:48

General

  • Target

    5df0c9e0e30e449d746c096a467d5217396a79a877be2081b7876af2a072fece.exe

  • Size

    191KB

  • MD5

    a8343b36fd866f4ec73184a55aebf791

  • SHA1

    9420445ca0f80f0714978bb158c10772a9eb8ec6

  • SHA256

    5df0c9e0e30e449d746c096a467d5217396a79a877be2081b7876af2a072fece

  • SHA512

    9081eb71127efc7dcaf1ba09d0390f71d344533c31c9c259cf495bc7c49c8609c25e4d54612a5becf5267494d035fee5d1e6f7e7a2552bee572f30ac6b4dc515

  • SSDEEP

    3072:7H+lBBpz9/vh9yxrVjljF5xFqeReI7pCpKeJNUWyqpvD3hyNQFFyb1:6Bpz9/vh9yxpBjFzzoK4WWJ9D3IGO

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 1 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 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\5df0c9e0e30e449d746c096a467d5217396a79a877be2081b7876af2a072fece.exe
    "C:\Users\Admin\AppData\Local\Temp\5df0c9e0e30e449d746c096a467d5217396a79a877be2081b7876af2a072fece.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2276
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hijpufqb\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2960
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\hbbtwgkw.exe" C:\Windows\SysWOW64\hijpufqb\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:968
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create hijpufqb binPath= "C:\Windows\SysWOW64\hijpufqb\hbbtwgkw.exe /d\"C:\Users\Admin\AppData\Local\Temp\5df0c9e0e30e449d746c096a467d5217396a79a877be2081b7876af2a072fece.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3808
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description hijpufqb "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4612
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start hijpufqb
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:5096
    • 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:4124
  • C:\Windows\SysWOW64\hijpufqb\hbbtwgkw.exe
    C:\Windows\SysWOW64\hijpufqb\hbbtwgkw.exe /d"C:\Users\Admin\AppData\Local\Temp\5df0c9e0e30e449d746c096a467d5217396a79a877be2081b7876af2a072fece.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1748
    • 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:2812

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    13.6MB

    MD5

    c44254e11169b20a549c79fa08d9bb51

    SHA1

    d695323279c5e1ad507d24b1f9a40fe4d01b0a4a

    SHA256

    9c44306cc6f25dfe7795786948a69ec65d7012c9ff4676d4f1958cb0acde2125

    SHA512

    a785b1df8b5cb73bb0b2d5c09f7ed1a94e1a99198a8f8c3b6af3a9065a041976214c00c488413e686c6260805d8826bbf3420956d8be6e550df99cdcdbcac2e2

  • memory/1748-17-0x0000000000400000-0x0000000000437000-memory.dmp

    Filesize

    220KB

  • memory/1748-12-0x0000000000400000-0x0000000000437000-memory.dmp

    Filesize

    220KB

  • memory/1748-11-0x0000000000400000-0x0000000000437000-memory.dmp

    Filesize

    220KB

  • memory/1748-13-0x0000000000400000-0x0000000000437000-memory.dmp

    Filesize

    220KB

  • memory/2276-2-0x0000000002180000-0x0000000002193000-memory.dmp

    Filesize

    76KB

  • memory/2276-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/2276-8-0x0000000002180000-0x0000000002193000-memory.dmp

    Filesize

    76KB

  • memory/2276-9-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/2276-7-0x0000000000400000-0x0000000000437000-memory.dmp

    Filesize

    220KB

  • memory/2276-1-0x00000000006E0000-0x00000000007E0000-memory.dmp

    Filesize

    1024KB

  • memory/2812-55-0x0000000007C00000-0x000000000800B000-memory.dmp

    Filesize

    4.0MB

  • memory/2812-44-0x0000000002F10000-0x0000000002F20000-memory.dmp

    Filesize

    64KB

  • memory/2812-19-0x0000000001040000-0x0000000001055000-memory.dmp

    Filesize

    84KB

  • memory/2812-21-0x0000000002C00000-0x0000000002E0F000-memory.dmp

    Filesize

    2.1MB

  • memory/2812-28-0x0000000002F10000-0x0000000002F20000-memory.dmp

    Filesize

    64KB

  • memory/2812-25-0x00000000011F0000-0x00000000011F6000-memory.dmp

    Filesize

    24KB

  • memory/2812-36-0x0000000002F10000-0x0000000002F20000-memory.dmp

    Filesize

    64KB

  • memory/2812-51-0x00000000031E0000-0x00000000031E5000-memory.dmp

    Filesize

    20KB

  • memory/2812-56-0x00000000031F0000-0x00000000031F7000-memory.dmp

    Filesize

    28KB

  • memory/2812-14-0x0000000001040000-0x0000000001055000-memory.dmp

    Filesize

    84KB

  • memory/2812-52-0x0000000007C00000-0x000000000800B000-memory.dmp

    Filesize

    4.0MB

  • memory/2812-48-0x00000000031E0000-0x00000000031E5000-memory.dmp

    Filesize

    20KB

  • memory/2812-47-0x0000000002F10000-0x0000000002F20000-memory.dmp

    Filesize

    64KB

  • memory/2812-46-0x0000000002F10000-0x0000000002F20000-memory.dmp

    Filesize

    64KB

  • memory/2812-45-0x0000000002F10000-0x0000000002F20000-memory.dmp

    Filesize

    64KB

  • memory/2812-18-0x0000000001040000-0x0000000001055000-memory.dmp

    Filesize

    84KB

  • memory/2812-43-0x0000000002F10000-0x0000000002F20000-memory.dmp

    Filesize

    64KB

  • memory/2812-42-0x0000000002F10000-0x0000000002F20000-memory.dmp

    Filesize

    64KB

  • memory/2812-41-0x0000000002F10000-0x0000000002F20000-memory.dmp

    Filesize

    64KB

  • memory/2812-40-0x0000000002F10000-0x0000000002F20000-memory.dmp

    Filesize

    64KB

  • memory/2812-39-0x0000000002F10000-0x0000000002F20000-memory.dmp

    Filesize

    64KB

  • memory/2812-38-0x0000000002F10000-0x0000000002F20000-memory.dmp

    Filesize

    64KB

  • memory/2812-37-0x0000000002F10000-0x0000000002F20000-memory.dmp

    Filesize

    64KB

  • memory/2812-35-0x0000000002F10000-0x0000000002F20000-memory.dmp

    Filesize

    64KB

  • memory/2812-34-0x0000000002F10000-0x0000000002F20000-memory.dmp

    Filesize

    64KB

  • memory/2812-33-0x0000000002F10000-0x0000000002F20000-memory.dmp

    Filesize

    64KB

  • memory/2812-32-0x0000000002F10000-0x0000000002F20000-memory.dmp

    Filesize

    64KB

  • memory/2812-31-0x0000000002F10000-0x0000000002F20000-memory.dmp

    Filesize

    64KB

  • memory/2812-24-0x0000000002C00000-0x0000000002E0F000-memory.dmp

    Filesize

    2.1MB