Analysis

  • max time kernel
    110s
  • max time network
    113s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    31-10-2024 02:31

General

  • Target

    c38d70a8dfe6c78114028dcbe7e24381a5298af60decb7cd47e3204b6757a69dN.exe

  • Size

    291KB

  • MD5

    2142c9af71f9457bde9b686bb5026b40

  • SHA1

    945388f0679942e5d7e09002c196e7f6221bc138

  • SHA256

    c38d70a8dfe6c78114028dcbe7e24381a5298af60decb7cd47e3204b6757a69d

  • SHA512

    5518e3a0c4ecc3be651daf6c2e90e7d00820a5eabc1ed5659cbd3ef6037df2a56c8c098d319f4ba5cc803f197731023b731a26758271f4a3f746083102b166ba

  • SSDEEP

    6144:TBkkWqRq2Xlt7GqD7hetXXPgPmU7J0jw:SV2XlEc7h+P8mU7J3

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.

  • Tofsee family
  • 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\c38d70a8dfe6c78114028dcbe7e24381a5298af60decb7cd47e3204b6757a69dN.exe
    "C:\Users\Admin\AppData\Local\Temp\c38d70a8dfe6c78114028dcbe7e24381a5298af60decb7cd47e3204b6757a69dN.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2728
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\encpvdwb\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2828
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\zognsqvn.exe" C:\Windows\SysWOW64\encpvdwb\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2860
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create encpvdwb binPath= "C:\Windows\SysWOW64\encpvdwb\zognsqvn.exe /d\"C:\Users\Admin\AppData\Local\Temp\c38d70a8dfe6c78114028dcbe7e24381a5298af60decb7cd47e3204b6757a69dN.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1948
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description encpvdwb "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2628
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start encpvdwb
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3020
    • 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:264
  • C:\Windows\SysWOW64\encpvdwb\zognsqvn.exe
    C:\Windows\SysWOW64\encpvdwb\zognsqvn.exe /d"C:\Users\Admin\AppData\Local\Temp\c38d70a8dfe6c78114028dcbe7e24381a5298af60decb7cd47e3204b6757a69dN.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2524
    • 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:2672

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    11.2MB

    MD5

    c744fca5985a158338a3e3bc8022c2c5

    SHA1

    f35abd523f3ed51fb2ea5cc3526d1a7432afe67e

    SHA256

    ccf048dcad0ccc0975d51cfc2547d001f2a00dd288deb19dc10f7924042e3324

    SHA512

    ea9468b5d8c42605d023cc12405c6ab902255fcb4a81578e3e3db622317be6574670f12bab11f4d7970fd572878864dfc4bbb4cd9e8df29ff58062d059b15ef0

  • memory/2524-17-0x0000000000400000-0x0000000002462000-memory.dmp

    Filesize

    32.4MB

  • memory/2672-50-0x00000000001F0000-0x00000000001F5000-memory.dmp

    Filesize

    20KB

  • memory/2672-36-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2672-23-0x0000000001A20000-0x0000000001C2F000-memory.dmp

    Filesize

    2.1MB

  • memory/2672-46-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2672-45-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2672-11-0x00000000000D0000-0x00000000000E5000-memory.dmp

    Filesize

    84KB

  • memory/2672-14-0x00000000000D0000-0x00000000000E5000-memory.dmp

    Filesize

    84KB

  • memory/2672-16-0x00000000000D0000-0x00000000000E5000-memory.dmp

    Filesize

    84KB

  • memory/2672-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

    Filesize

    4KB

  • memory/2672-18-0x00000000000D0000-0x00000000000E5000-memory.dmp

    Filesize

    84KB

  • memory/2672-30-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2672-24-0x0000000000150000-0x0000000000156000-memory.dmp

    Filesize

    24KB

  • memory/2672-20-0x0000000001A20000-0x0000000001C2F000-memory.dmp

    Filesize

    2.1MB

  • memory/2672-55-0x0000000000200000-0x0000000000207000-memory.dmp

    Filesize

    28KB

  • memory/2672-54-0x0000000005500000-0x000000000590B000-memory.dmp

    Filesize

    4.0MB

  • memory/2672-52-0x0000000005500000-0x000000000590B000-memory.dmp

    Filesize

    4.0MB

  • memory/2672-31-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2672-47-0x00000000001F0000-0x00000000001F5000-memory.dmp

    Filesize

    20KB

  • memory/2672-32-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2672-27-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2672-43-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2672-44-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2672-42-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2672-41-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2672-40-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2672-39-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2672-38-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2672-37-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2672-33-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2672-35-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2672-34-0x0000000000160000-0x0000000000170000-memory.dmp

    Filesize

    64KB

  • memory/2728-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/2728-8-0x0000000000400000-0x0000000002462000-memory.dmp

    Filesize

    32.4MB

  • memory/2728-1-0x0000000002500000-0x0000000002600000-memory.dmp

    Filesize

    1024KB

  • memory/2728-2-0x00000000002C0000-0x00000000002D3000-memory.dmp

    Filesize

    76KB

  • memory/2728-9-0x00000000002C0000-0x00000000002D3000-memory.dmp

    Filesize

    76KB

  • memory/2728-10-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB