Analysis

  • max time kernel
    150s
  • max time network
    151s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-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.

  • Windows security bypass 2 TTPs 1 IoCs
  • Creates new service(s) 2 TTPs
  • Modifies Windows Firewall 2 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • 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 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\8f068c21f73b64644779c6d31a47f4014ad4dbf0d958cd3fb673b6617ca6e2ecN.exe
    "C:\Users\Admin\AppData\Local\Temp\8f068c21f73b64644779c6d31a47f4014ad4dbf0d958cd3fb673b6617ca6e2ecN.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2180
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\nkmxsdhk\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2936
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\bihuccko.exe" C:\Windows\SysWOW64\nkmxsdhk\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3024
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create nkmxsdhk binPath= "C:\Windows\SysWOW64\nkmxsdhk\bihuccko.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:2084
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description nkmxsdhk "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:468
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start nkmxsdhk
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2692
    • 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:2740
  • C:\Windows\SysWOW64\nkmxsdhk\bihuccko.exe
    C:\Windows\SysWOW64\nkmxsdhk\bihuccko.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:2756
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Windows security bypass
      • 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\bihuccko.exe

    Filesize

    13.0MB

    MD5

    4adf65b14750afdfb0f51e1b3881ec5d

    SHA1

    642dcfa9e583d1b22a0e96319db9cea7c7cfeb9e

    SHA256

    6549be3bc8af2dd644c9bc51047d6947db30ecf5c0eeee579ad734e8158b773f

    SHA512

    c230f8ed33ec3141af471560aa32c685414c2ecaa710190da357512c59137c2f21a15c4b91bd4a44a30e4dd3176044a49f6069a1e88ef0e32ef268962cac76bb

  • memory/2812-6-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2812-5-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

    Filesize

    4KB

  • memory/2812-3-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2812-8-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2812-9-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2812-14-0x0000000001950000-0x0000000001B5F000-memory.dmp

    Filesize

    2.1MB

  • memory/2812-15-0x0000000000150000-0x0000000000156000-memory.dmp

    Filesize

    24KB

  • memory/2812-18-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2812-11-0x0000000001950000-0x0000000001B5F000-memory.dmp

    Filesize

    2.1MB

  • memory/2812-41-0x0000000000180000-0x0000000000185000-memory.dmp

    Filesize

    20KB

  • memory/2812-38-0x0000000000180000-0x0000000000185000-memory.dmp

    Filesize

    20KB

  • memory/2812-37-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2812-36-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2812-35-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2812-34-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2812-33-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2812-32-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2812-31-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2812-30-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2812-29-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2812-28-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2812-27-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2812-26-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2812-25-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2812-24-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2812-23-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2812-22-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2812-21-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2812-45-0x0000000005500000-0x000000000590B000-memory.dmp

    Filesize

    4.0MB

  • memory/2812-46-0x00000000001F0000-0x00000000001F7000-memory.dmp

    Filesize

    28KB

  • memory/2812-42-0x0000000005500000-0x000000000590B000-memory.dmp

    Filesize

    4.0MB