Analysis

  • max time kernel
    149s
  • max time network
    150s
  • platform
    windows7_x64
  • resource
    win7-20240708-en
  • resource tags

    arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-x64system
  • submitted
    06-09-2024 16:18

General

  • Target

    8f6bbc692073146dfc23b5743a53d2abc158831b64964de5ec6a15cf573bf8d3.exe

  • Size

    213KB

  • MD5

    9ad5cb5878facd1f519325f68cb408a1

  • SHA1

    64450bf9e67e5001835661493053e6ce67cc42b5

  • SHA256

    8f6bbc692073146dfc23b5743a53d2abc158831b64964de5ec6a15cf573bf8d3

  • SHA512

    5a45b850989000c24a25ac27a4ca3480bfed933912e7add4834f5c443486240d60d9a56a5418ca43ac0888898072de72cb029dfb29105560192937d10a93b0bd

  • SSDEEP

    6144:1DDXnqPnz5vSel6TKC1onDZ/MU0Vdh1HQ:1XXq/z5vSNKC1onDSVdz

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
  • Looks up external IP address via web service 2 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 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\8f6bbc692073146dfc23b5743a53d2abc158831b64964de5ec6a15cf573bf8d3.exe
    "C:\Users\Admin\AppData\Local\Temp\8f6bbc692073146dfc23b5743a53d2abc158831b64964de5ec6a15cf573bf8d3.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2856
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\sxkfclzq\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2840
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\rhheqcsq.exe" C:\Windows\SysWOW64\sxkfclzq\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2920
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create sxkfclzq binPath= "C:\Windows\SysWOW64\sxkfclzq\rhheqcsq.exe /d\"C:\Users\Admin\AppData\Local\Temp\8f6bbc692073146dfc23b5743a53d2abc158831b64964de5ec6a15cf573bf8d3.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2736
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description sxkfclzq "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2712
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start sxkfclzq
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2632
    • 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:768
  • C:\Windows\SysWOW64\sxkfclzq\rhheqcsq.exe
    C:\Windows\SysWOW64\sxkfclzq\rhheqcsq.exe /d"C:\Users\Admin\AppData\Local\Temp\8f6bbc692073146dfc23b5743a53d2abc158831b64964de5ec6a15cf573bf8d3.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2012
    • 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:2248

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    10.5MB

    MD5

    bf067d88fbae90c0696250d366d9ceda

    SHA1

    0ec52b9b413f859d995ab74247f64c76e141c0eb

    SHA256

    97873232206ed419d420ec58ccc977f290504e66904704754fc38fedc67297fd

    SHA512

    f8331c472430dab22b5a895dba0e75c14903ecf6bb54d8eb6315ef574f6f045def1bcc5db76c9f057d4134074d3e5006ca8f8cc6cc9069881f2a72592b570e2b

  • memory/2012-12-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/2248-38-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2248-23-0x0000000001D90000-0x0000000001F9F000-memory.dmp

    Filesize

    2.1MB

  • memory/2248-11-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2248-45-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2248-8-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2248-54-0x0000000005750000-0x0000000005B5B000-memory.dmp

    Filesize

    4.0MB

  • memory/2248-44-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2248-24-0x00000000000E0000-0x00000000000E6000-memory.dmp

    Filesize

    24KB

  • memory/2248-30-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2248-17-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2248-18-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2248-20-0x0000000001D90000-0x0000000001F9F000-memory.dmp

    Filesize

    2.1MB

  • memory/2248-27-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2248-51-0x0000000005750000-0x0000000005B5B000-memory.dmp

    Filesize

    4.0MB

  • memory/2248-55-0x0000000000300000-0x0000000000307000-memory.dmp

    Filesize

    28KB

  • memory/2248-50-0x00000000001B0000-0x00000000001B5000-memory.dmp

    Filesize

    20KB

  • memory/2248-47-0x00000000001B0000-0x00000000001B5000-memory.dmp

    Filesize

    20KB

  • memory/2248-46-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2248-10-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

    Filesize

    4KB

  • memory/2248-31-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2248-42-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2248-43-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2248-41-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2248-40-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2248-39-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2248-32-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2248-37-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2248-36-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2248-35-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2248-34-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2248-33-0x00000000001A0000-0x00000000001B0000-memory.dmp

    Filesize

    64KB

  • memory/2856-1-0x0000000000550000-0x0000000000650000-memory.dmp

    Filesize

    1024KB

  • memory/2856-4-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/2856-15-0x0000000000220000-0x0000000000233000-memory.dmp

    Filesize

    76KB

  • memory/2856-16-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/2856-14-0x0000000000400000-0x000000000043C000-memory.dmp

    Filesize

    240KB

  • memory/2856-2-0x0000000000220000-0x0000000000233000-memory.dmp

    Filesize

    76KB