Analysis

  • max time kernel
    142s
  • max time network
    153s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    03-09-2024 16:53

General

  • Target

    vekvtia.exe

  • Size

    10.5MB

  • MD5

    274d0ab4368246be7f22990d9d5cb4cf

  • SHA1

    d34547e852863893aef034effc726bf2ee227d02

  • SHA256

    21a5e8cf356706a639eee50ea97cecef91685eb906921245c314ac50950b9825

  • SHA512

    dab676f30f08c6719e26cc376c89803a14d89adf50c6ee31d941f724b3dae03ca1cce950a3dd7651e3ed5f40323b021c875cdd1dfbbba9952cd417d7a3f90e81

  • SSDEEP

    6144:Sc6OZDisWsD0Td2HJxO+m8PuG1R4WnWjrsaz:S1OZDisvwdaxO0PuG1R4CWs

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\vekvtia.exe
    "C:\Users\Admin\AppData\Local\Temp\vekvtia.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2688
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\gmjdverw\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2948
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\foufdsk.exe" C:\Windows\SysWOW64\gmjdverw\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2752
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create gmjdverw binPath= "C:\Windows\SysWOW64\gmjdverw\foufdsk.exe /d\"C:\Users\Admin\AppData\Local\Temp\vekvtia.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2128
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description gmjdverw "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2572
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start gmjdverw
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1608
    • 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:1784
  • C:\Windows\SysWOW64\gmjdverw\foufdsk.exe
    C:\Windows\SysWOW64\gmjdverw\foufdsk.exe /d"C:\Users\Admin\AppData\Local\Temp\vekvtia.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2560
    • 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:2668

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    11.2MB

    MD5

    3482cbbb23d7548633dde35f128ea40a

    SHA1

    b8cba7389b8e195b30ceb2e1a2b1d1fd6129adbd

    SHA256

    8777baf9f5a68be1faf17fa6f7c5ab3de0113392784cc150b822b7db5426e380

    SHA512

    db334c6aae52045ff3ce7597f172cce21f5a3a61a85b8dd4c5517eac649b60e429df968e1538c99080449d0ebfb5d8e917cb43bfa105e27d0a790ca2463748c7

  • memory/2560-13-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/2668-40-0x0000000000230000-0x0000000000240000-memory.dmp

    Filesize

    64KB

  • memory/2668-55-0x00000000005A0000-0x00000000005A7000-memory.dmp

    Filesize

    28KB

  • memory/2668-11-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2668-47-0x0000000000450000-0x0000000000455000-memory.dmp

    Filesize

    20KB

  • memory/2668-8-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2668-54-0x0000000005710000-0x0000000005B1B000-memory.dmp

    Filesize

    4.0MB

  • memory/2668-46-0x0000000000230000-0x0000000000240000-memory.dmp

    Filesize

    64KB

  • memory/2668-51-0x0000000005710000-0x0000000005B1B000-memory.dmp

    Filesize

    4.0MB

  • memory/2668-30-0x0000000000230000-0x0000000000240000-memory.dmp

    Filesize

    64KB

  • memory/2668-17-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2668-18-0x0000000000080000-0x0000000000095000-memory.dmp

    Filesize

    84KB

  • memory/2668-24-0x0000000000190000-0x0000000000196000-memory.dmp

    Filesize

    24KB

  • memory/2668-27-0x0000000000230000-0x0000000000240000-memory.dmp

    Filesize

    64KB

  • memory/2668-23-0x0000000001AE0000-0x0000000001CEF000-memory.dmp

    Filesize

    2.1MB

  • memory/2668-20-0x0000000001AE0000-0x0000000001CEF000-memory.dmp

    Filesize

    2.1MB

  • memory/2668-38-0x0000000000230000-0x0000000000240000-memory.dmp

    Filesize

    64KB

  • memory/2668-37-0x0000000000230000-0x0000000000240000-memory.dmp

    Filesize

    64KB

  • memory/2668-50-0x0000000000450000-0x0000000000455000-memory.dmp

    Filesize

    20KB

  • memory/2668-10-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

    Filesize

    4KB

  • memory/2668-31-0x0000000000230000-0x0000000000240000-memory.dmp

    Filesize

    64KB

  • memory/2668-44-0x0000000000230000-0x0000000000240000-memory.dmp

    Filesize

    64KB

  • memory/2668-45-0x0000000000230000-0x0000000000240000-memory.dmp

    Filesize

    64KB

  • memory/2668-43-0x0000000000230000-0x0000000000240000-memory.dmp

    Filesize

    64KB

  • memory/2668-42-0x0000000000230000-0x0000000000240000-memory.dmp

    Filesize

    64KB

  • memory/2668-41-0x0000000000230000-0x0000000000240000-memory.dmp

    Filesize

    64KB

  • memory/2668-32-0x0000000000230000-0x0000000000240000-memory.dmp

    Filesize

    64KB

  • memory/2668-39-0x0000000000230000-0x0000000000240000-memory.dmp

    Filesize

    64KB

  • memory/2668-36-0x0000000000230000-0x0000000000240000-memory.dmp

    Filesize

    64KB

  • memory/2668-35-0x0000000000230000-0x0000000000240000-memory.dmp

    Filesize

    64KB

  • memory/2668-34-0x0000000000230000-0x0000000000240000-memory.dmp

    Filesize

    64KB

  • memory/2668-33-0x0000000000230000-0x0000000000240000-memory.dmp

    Filesize

    64KB

  • memory/2688-1-0x00000000007C0000-0x00000000008C0000-memory.dmp

    Filesize

    1024KB

  • memory/2688-3-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/2688-14-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/2688-15-0x0000000000230000-0x0000000000243000-memory.dmp

    Filesize

    76KB

  • memory/2688-16-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/2688-2-0x0000000000230000-0x0000000000243000-memory.dmp

    Filesize

    76KB