Analysis

  • max time kernel
    150s
  • max time network
    152s
  • 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 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.

  • 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:116
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\evaiepss\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3580
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\knkduwqg.exe" C:\Windows\SysWOW64\evaiepss\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4156
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create evaiepss binPath= "C:\Windows\SysWOW64\evaiepss\knkduwqg.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:1008
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description evaiepss "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:760
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start evaiepss
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2832
    • 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:964
  • C:\Windows\SysWOW64\evaiepss\knkduwqg.exe
    C:\Windows\SysWOW64\evaiepss\knkduwqg.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:3864
    • 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:3368

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    11.8MB

    MD5

    b32f61c5c47e9473cf4a0ac98e8143c1

    SHA1

    d6de6d48a87510f4ba641785e56311a4732dcf26

    SHA256

    2d49ab2f33264eb29d38ab91a7c6dc193a6a0fa65260b0295b1123c18612d7c5

    SHA512

    cc0cc0499616d0277920597b7beb8ee0b53d99c9e8d8c827c6e2244dc9a98785a848f17368f6991d362f9b6f76cd3a1f7ebcc31e99c34097c458872336ab5c21

  • memory/116-1-0x0000000000880000-0x0000000000980000-memory.dmp

    Filesize

    1024KB

  • memory/116-2-0x0000000002340000-0x0000000002353000-memory.dmp

    Filesize

    76KB

  • memory/116-4-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/116-7-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/116-9-0x0000000000400000-0x0000000000415000-memory.dmp

    Filesize

    84KB

  • memory/116-8-0x0000000002340000-0x0000000002353000-memory.dmp

    Filesize

    76KB

  • memory/3368-45-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

    Filesize

    64KB

  • memory/3368-40-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

    Filesize

    64KB

  • memory/3368-13-0x0000000000810000-0x0000000000825000-memory.dmp

    Filesize

    84KB

  • memory/3368-17-0x0000000000810000-0x0000000000825000-memory.dmp

    Filesize

    84KB

  • memory/3368-20-0x0000000002600000-0x000000000280F000-memory.dmp

    Filesize

    2.1MB

  • memory/3368-18-0x0000000000810000-0x0000000000825000-memory.dmp

    Filesize

    84KB

  • memory/3368-46-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

    Filesize

    64KB

  • memory/3368-55-0x0000000002BD0000-0x0000000002BD7000-memory.dmp

    Filesize

    28KB

  • memory/3368-51-0x0000000007600000-0x0000000007A0B000-memory.dmp

    Filesize

    4.0MB

  • memory/3368-50-0x0000000001DF0000-0x0000000001DF5000-memory.dmp

    Filesize

    20KB

  • memory/3368-47-0x0000000001DF0000-0x0000000001DF5000-memory.dmp

    Filesize

    20KB

  • memory/3368-31-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

    Filesize

    64KB

  • memory/3368-43-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

    Filesize

    64KB

  • memory/3368-42-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

    Filesize

    64KB

  • memory/3368-41-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

    Filesize

    64KB

  • memory/3368-44-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

    Filesize

    64KB

  • memory/3368-39-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

    Filesize

    64KB

  • memory/3368-38-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

    Filesize

    64KB

  • memory/3368-37-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

    Filesize

    64KB

  • memory/3368-36-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

    Filesize

    64KB

  • memory/3368-35-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

    Filesize

    64KB

  • memory/3368-34-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

    Filesize

    64KB

  • memory/3368-33-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

    Filesize

    64KB

  • memory/3368-32-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

    Filesize

    64KB

  • memory/3368-30-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

    Filesize

    64KB

  • memory/3368-54-0x0000000007600000-0x0000000007A0B000-memory.dmp

    Filesize

    4.0MB

  • memory/3368-27-0x0000000001DE0000-0x0000000001DF0000-memory.dmp

    Filesize

    64KB

  • memory/3368-24-0x00000000009F0000-0x00000000009F6000-memory.dmp

    Filesize

    24KB

  • memory/3368-23-0x0000000002600000-0x000000000280F000-memory.dmp

    Filesize

    2.1MB

  • memory/3864-11-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/3864-12-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB

  • memory/3864-16-0x0000000000400000-0x00000000005FE000-memory.dmp

    Filesize

    2.0MB