Analysis

  • max time kernel
    150s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03/09/2024, 17:05

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.

  • 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\vekvtia.exe
    "C:\Users\Admin\AppData\Local\Temp\vekvtia.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:776
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hxaiihhw\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3248
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\frdiflky.exe" C:\Windows\SysWOW64\hxaiihhw\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3328
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create hxaiihhw binPath= "C:\Windows\SysWOW64\hxaiihhw\frdiflky.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:768
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description hxaiihhw "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4044
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start hxaiihhw
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1228
    • 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:1440
  • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
    "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --field-trial-handle=4448,i,1330210614411927383,9239043499051775691,262144 --variations-seed-version --mojo-platform-channel-handle=4360 /prefetch:8
    1⤵
      PID:452
    • C:\Windows\SysWOW64\hxaiihhw\frdiflky.exe
      C:\Windows\SysWOW64\hxaiihhw\frdiflky.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:1628
      • 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:652

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

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

      Filesize

      12.8MB

      MD5

      56c2629176cc0e92cc9ea1f4eb5397cb

      SHA1

      160447848c3f68bb786ea3147853388ebe5a62c7

      SHA256

      b2210ba08fb0733a8a35478489712c936d628e79d5e69b1b5f6123dd4204f211

      SHA512

      02e43626eba06d60cab9118f6a2d2b9e4b9867364d98271371b15ff424c7ee6707ab59cb496581ae9f64b655705b47cd462076fd53c23e0f744f4bcbed44c8d8

    • memory/652-45-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

      Filesize

      64KB

    • memory/652-43-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

      Filesize

      64KB

    • memory/652-24-0x0000000001FA0000-0x0000000001FA6000-memory.dmp

      Filesize

      24KB

    • memory/652-27-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

      Filesize

      64KB

    • memory/652-21-0x0000000002800000-0x0000000002A0F000-memory.dmp

      Filesize

      2.1MB

    • memory/652-31-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

      Filesize

      64KB

    • memory/652-54-0x0000000007700000-0x0000000007B0B000-memory.dmp

      Filesize

      4.0MB

    • memory/652-23-0x0000000002800000-0x0000000002A0F000-memory.dmp

      Filesize

      2.1MB

    • memory/652-13-0x0000000000AF0000-0x0000000000B05000-memory.dmp

      Filesize

      84KB

    • memory/652-42-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

      Filesize

      64KB

    • memory/652-16-0x0000000000AF0000-0x0000000000B05000-memory.dmp

      Filesize

      84KB

    • memory/652-18-0x0000000000AF0000-0x0000000000B05000-memory.dmp

      Filesize

      84KB

    • memory/652-50-0x0000000002BD0000-0x0000000002BD5000-memory.dmp

      Filesize

      20KB

    • memory/652-55-0x0000000002BE0000-0x0000000002BE7000-memory.dmp

      Filesize

      28KB

    • memory/652-51-0x0000000007700000-0x0000000007B0B000-memory.dmp

      Filesize

      4.0MB

    • memory/652-47-0x0000000002BD0000-0x0000000002BD5000-memory.dmp

      Filesize

      20KB

    • memory/652-46-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

      Filesize

      64KB

    • memory/652-30-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

      Filesize

      64KB

    • memory/652-32-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

      Filesize

      64KB

    • memory/652-44-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

      Filesize

      64KB

    • memory/652-33-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

      Filesize

      64KB

    • memory/652-41-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

      Filesize

      64KB

    • memory/652-40-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

      Filesize

      64KB

    • memory/652-39-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

      Filesize

      64KB

    • memory/652-38-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

      Filesize

      64KB

    • memory/652-37-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

      Filesize

      64KB

    • memory/652-36-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

      Filesize

      64KB

    • memory/652-35-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

      Filesize

      64KB

    • memory/652-34-0x0000000001FB0000-0x0000000001FC0000-memory.dmp

      Filesize

      64KB

    • memory/776-3-0x0000000000400000-0x0000000000415000-memory.dmp

      Filesize

      84KB

    • memory/776-1-0x00000000008F0000-0x00000000009F0000-memory.dmp

      Filesize

      1024KB

    • memory/776-7-0x0000000000400000-0x00000000005FE000-memory.dmp

      Filesize

      2.0MB

    • memory/776-8-0x0000000000860000-0x0000000000873000-memory.dmp

      Filesize

      76KB

    • memory/776-9-0x0000000000400000-0x0000000000415000-memory.dmp

      Filesize

      84KB

    • memory/776-2-0x0000000000860000-0x0000000000873000-memory.dmp

      Filesize

      76KB

    • memory/1628-17-0x0000000000400000-0x00000000005FE000-memory.dmp

      Filesize

      2.0MB

    • memory/1628-12-0x0000000000400000-0x00000000005FE000-memory.dmp

      Filesize

      2.0MB

    • memory/1628-11-0x0000000000400000-0x00000000005FE000-memory.dmp

      Filesize

      2.0MB