Analysis

  • max time kernel
    140s
  • max time network
    149s
  • 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, 10:27

General

  • Target

    36b524a7a3b444ebe042a71bcd6fab2a615371e036a8c6a3514e78dc2c9445f1.exe

  • Size

    399KB

  • MD5

    05b66bfebe0f44b1eb15ede797adbecd

  • SHA1

    6a9227f4cdc2cd60f594ccf4a265a39bea7bdeab

  • SHA256

    36b524a7a3b444ebe042a71bcd6fab2a615371e036a8c6a3514e78dc2c9445f1

  • SHA512

    1cae3a1419d42c0b131e475549731d4e37cb64e9e945451308bca32f1667ef4621ab8aeaf794f66b6a9e510c1368aa6fafdd52c6dd618e2afddaff043c877517

  • SSDEEP

    6144:0Epz3ZfyHfWBmYALwRzU3EHHxdzJF0PwVFdgiR4i/OP3A:0Epz3ZfyHfWB7o3EHRdFFwEOc48

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\36b524a7a3b444ebe042a71bcd6fab2a615371e036a8c6a3514e78dc2c9445f1.exe
    "C:\Users\Admin\AppData\Local\Temp\36b524a7a3b444ebe042a71bcd6fab2a615371e036a8c6a3514e78dc2c9445f1.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3844
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\aghmpdtt\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3272
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\nhmkfifh.exe" C:\Windows\SysWOW64\aghmpdtt\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3732
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create aghmpdtt binPath= "C:\Windows\SysWOW64\aghmpdtt\nhmkfifh.exe /d\"C:\Users\Admin\AppData\Local\Temp\36b524a7a3b444ebe042a71bcd6fab2a615371e036a8c6a3514e78dc2c9445f1.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1160
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description aghmpdtt "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:716
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start aghmpdtt
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:6092
    • 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:3532
  • C:\Windows\SysWOW64\aghmpdtt\nhmkfifh.exe
    C:\Windows\SysWOW64\aghmpdtt\nhmkfifh.exe /d"C:\Users\Admin\AppData\Local\Temp\36b524a7a3b444ebe042a71bcd6fab2a615371e036a8c6a3514e78dc2c9445f1.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4640
    • 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:4604

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

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

    Filesize

    13.6MB

    MD5

    3960d6c62dd2047bf88eeece7d5809a6

    SHA1

    02a487b4407ce8b296da9ca9fdeafd0e0551f7d3

    SHA256

    6c32bcc9a1fac31d214590731bdfe703a5633aefbd01984e41a43d7d6e345ecb

    SHA512

    f38c43417941b152cbc626a7ce84b83d9a455da793fbc9feb6901fdef656a958cd2204f5db135f7b1ef74635674a9aed869c4cc5fa074430bdd0e735523e15dc

  • memory/3844-1-0x00000000008F0000-0x00000000009F0000-memory.dmp

    Filesize

    1024KB

  • memory/3844-2-0x0000000000860000-0x0000000000873000-memory.dmp

    Filesize

    76KB

  • memory/3844-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/3844-9-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/3844-8-0x0000000000860000-0x0000000000873000-memory.dmp

    Filesize

    76KB

  • memory/3844-7-0x0000000000400000-0x00000000005F8000-memory.dmp

    Filesize

    2.0MB

  • memory/4604-45-0x0000000001970000-0x0000000001980000-memory.dmp

    Filesize

    64KB

  • memory/4604-41-0x0000000001970000-0x0000000001980000-memory.dmp

    Filesize

    64KB

  • memory/4604-13-0x00000000004A0000-0x00000000004B5000-memory.dmp

    Filesize

    84KB

  • memory/4604-24-0x0000000000C60000-0x0000000000C66000-memory.dmp

    Filesize

    24KB

  • memory/4604-16-0x00000000004A0000-0x00000000004B5000-memory.dmp

    Filesize

    84KB

  • memory/4604-18-0x00000000004A0000-0x00000000004B5000-memory.dmp

    Filesize

    84KB

  • memory/4604-50-0x00000000025D0000-0x00000000025D5000-memory.dmp

    Filesize

    20KB

  • memory/4604-51-0x0000000007080000-0x000000000748B000-memory.dmp

    Filesize

    4.0MB

  • memory/4604-55-0x00000000025E0000-0x00000000025E7000-memory.dmp

    Filesize

    28KB

  • memory/4604-47-0x00000000025D0000-0x00000000025D5000-memory.dmp

    Filesize

    20KB

  • memory/4604-46-0x0000000001970000-0x0000000001980000-memory.dmp

    Filesize

    64KB

  • memory/4604-27-0x0000000001970000-0x0000000001980000-memory.dmp

    Filesize

    64KB

  • memory/4604-44-0x0000000001970000-0x0000000001980000-memory.dmp

    Filesize

    64KB

  • memory/4604-43-0x0000000001970000-0x0000000001980000-memory.dmp

    Filesize

    64KB

  • memory/4604-42-0x0000000001970000-0x0000000001980000-memory.dmp

    Filesize

    64KB

  • memory/4604-20-0x0000000002200000-0x000000000240F000-memory.dmp

    Filesize

    2.1MB

  • memory/4604-40-0x0000000001970000-0x0000000001980000-memory.dmp

    Filesize

    64KB

  • memory/4604-39-0x0000000001970000-0x0000000001980000-memory.dmp

    Filesize

    64KB

  • memory/4604-38-0x0000000001970000-0x0000000001980000-memory.dmp

    Filesize

    64KB

  • memory/4604-37-0x0000000001970000-0x0000000001980000-memory.dmp

    Filesize

    64KB

  • memory/4604-36-0x0000000001970000-0x0000000001980000-memory.dmp

    Filesize

    64KB

  • memory/4604-35-0x0000000001970000-0x0000000001980000-memory.dmp

    Filesize

    64KB

  • memory/4604-33-0x0000000001970000-0x0000000001980000-memory.dmp

    Filesize

    64KB

  • memory/4604-32-0x0000000001970000-0x0000000001980000-memory.dmp

    Filesize

    64KB

  • memory/4604-31-0x0000000001970000-0x0000000001980000-memory.dmp

    Filesize

    64KB

  • memory/4604-30-0x0000000001970000-0x0000000001980000-memory.dmp

    Filesize

    64KB

  • memory/4604-23-0x0000000002200000-0x000000000240F000-memory.dmp

    Filesize

    2.1MB

  • memory/4604-54-0x0000000007080000-0x000000000748B000-memory.dmp

    Filesize

    4.0MB

  • memory/4604-34-0x0000000001970000-0x0000000001980000-memory.dmp

    Filesize

    64KB

  • memory/4640-12-0x0000000000400000-0x00000000005F8000-memory.dmp

    Filesize

    2.0MB

  • memory/4640-11-0x0000000000400000-0x00000000005F8000-memory.dmp

    Filesize

    2.0MB

  • memory/4640-17-0x0000000000400000-0x00000000005F8000-memory.dmp

    Filesize

    2.0MB