Analysis

  • max time kernel
    149s
  • max time network
    150s
  • 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, 14:18

General

  • Target

    57f6dbc4d6b680cfc1efb711e71be666540572c77e93555a246239227d463367.exe

  • Size

    414KB

  • MD5

    2b67e390e0b1d03d9b6e99d0271b8883

  • SHA1

    3c5dbe4222c43bbb6c8065142eb660a9c07af33e

  • SHA256

    57f6dbc4d6b680cfc1efb711e71be666540572c77e93555a246239227d463367

  • SHA512

    c040572536f174f22dd20308c754ee81fdb5fafe99f555575227113e7fdb67462eba5ecadbf645c2f6f6798b15d64b7950774d3d2340db76c06764210c26576b

  • SSDEEP

    3072:DaX5P74gWHs72AQo6ssNJb1SyLhzmqSWCXwwQS7tbdi2lA7MJZ4899kbKn4yixxb:W5jpWHs720fO0ysHR02lAMp9iK4dMt

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.

  • Program crash 2 IoCs
  • 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\57f6dbc4d6b680cfc1efb711e71be666540572c77e93555a246239227d463367.exe
    "C:\Users\Admin\AppData\Local\Temp\57f6dbc4d6b680cfc1efb711e71be666540572c77e93555a246239227d463367.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3468
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\kkayyuse\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:5012
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\eqyvbous.exe" C:\Windows\SysWOW64\kkayyuse\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3000
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create kkayyuse binPath= "C:\Windows\SysWOW64\kkayyuse\eqyvbous.exe /d\"C:\Users\Admin\AppData\Local\Temp\57f6dbc4d6b680cfc1efb711e71be666540572c77e93555a246239227d463367.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2904
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description kkayyuse "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:5112
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start kkayyuse
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2460
    • 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:5016
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3468 -s 1220
      2⤵
      • Program crash
      PID:4380
  • C:\Windows\SysWOW64\kkayyuse\eqyvbous.exe
    C:\Windows\SysWOW64\kkayyuse\eqyvbous.exe /d"C:\Users\Admin\AppData\Local\Temp\57f6dbc4d6b680cfc1efb711e71be666540572c77e93555a246239227d463367.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4820
    • 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:2484
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4820 -s 512
      2⤵
      • Program crash
      PID:3412
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 3468 -ip 3468
    1⤵
      PID:4020
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 4820 -ip 4820
      1⤵
        PID:1624

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        10.7MB

        MD5

        6e23f7b7a21dfbe1bf8c96fc7cec16f0

        SHA1

        ef52f073e05e71a0bc50a05b711ee57b74e00019

        SHA256

        6b1890e64192403352dcf3b8cc565dc7f5c031d0798c349efa2ee2daa49394a8

        SHA512

        1877586cf34ca72eecb17978222259bdbbab082d3f27394459605f6f1357fd6994eb7c234d91acf37f074880572cf7b5579f06fe34c47d7adc671ad8d6244d90

      • memory/2484-34-0x0000000001F70000-0x0000000001F80000-memory.dmp

        Filesize

        64KB

      • memory/2484-50-0x0000000002DD0000-0x0000000002DD5000-memory.dmp

        Filesize

        20KB

      • memory/2484-54-0x0000000007780000-0x0000000007B8B000-memory.dmp

        Filesize

        4.0MB

      • memory/2484-24-0x0000000001F60000-0x0000000001F66000-memory.dmp

        Filesize

        24KB

      • memory/2484-38-0x0000000001F70000-0x0000000001F80000-memory.dmp

        Filesize

        64KB

      • memory/2484-23-0x0000000002800000-0x0000000002A0F000-memory.dmp

        Filesize

        2.1MB

      • memory/2484-27-0x0000000001F70000-0x0000000001F80000-memory.dmp

        Filesize

        64KB

      • memory/2484-30-0x0000000001F70000-0x0000000001F80000-memory.dmp

        Filesize

        64KB

      • memory/2484-14-0x00000000009A0000-0x00000000009B5000-memory.dmp

        Filesize

        84KB

      • memory/2484-31-0x0000000001F70000-0x0000000001F80000-memory.dmp

        Filesize

        64KB

      • memory/2484-16-0x00000000009A0000-0x00000000009B5000-memory.dmp

        Filesize

        84KB

      • memory/2484-17-0x00000000009A0000-0x00000000009B5000-memory.dmp

        Filesize

        84KB

      • memory/2484-32-0x0000000001F70000-0x0000000001F80000-memory.dmp

        Filesize

        64KB

      • memory/2484-21-0x0000000002800000-0x0000000002A0F000-memory.dmp

        Filesize

        2.1MB

      • memory/2484-55-0x0000000002DE0000-0x0000000002DE7000-memory.dmp

        Filesize

        28KB

      • memory/2484-51-0x0000000007780000-0x0000000007B8B000-memory.dmp

        Filesize

        4.0MB

      • memory/2484-45-0x0000000001F70000-0x0000000001F80000-memory.dmp

        Filesize

        64KB

      • memory/2484-47-0x0000000002DD0000-0x0000000002DD5000-memory.dmp

        Filesize

        20KB

      • memory/2484-33-0x0000000001F70000-0x0000000001F80000-memory.dmp

        Filesize

        64KB

      • memory/2484-46-0x0000000001F70000-0x0000000001F80000-memory.dmp

        Filesize

        64KB

      • memory/2484-41-0x0000000001F70000-0x0000000001F80000-memory.dmp

        Filesize

        64KB

      • memory/2484-43-0x0000000001F70000-0x0000000001F80000-memory.dmp

        Filesize

        64KB

      • memory/2484-42-0x0000000001F70000-0x0000000001F80000-memory.dmp

        Filesize

        64KB

      • memory/2484-44-0x0000000001F70000-0x0000000001F80000-memory.dmp

        Filesize

        64KB

      • memory/2484-40-0x0000000001F70000-0x0000000001F80000-memory.dmp

        Filesize

        64KB

      • memory/2484-39-0x0000000001F70000-0x0000000001F80000-memory.dmp

        Filesize

        64KB

      • memory/2484-37-0x0000000001F70000-0x0000000001F80000-memory.dmp

        Filesize

        64KB

      • memory/2484-36-0x0000000001F70000-0x0000000001F80000-memory.dmp

        Filesize

        64KB

      • memory/2484-35-0x0000000001F70000-0x0000000001F80000-memory.dmp

        Filesize

        64KB

      • memory/3468-2-0x0000000002350000-0x0000000002363000-memory.dmp

        Filesize

        76KB

      • memory/3468-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3468-8-0x0000000002350000-0x0000000002363000-memory.dmp

        Filesize

        76KB

      • memory/3468-7-0x0000000000400000-0x00000000005FB000-memory.dmp

        Filesize

        2.0MB

      • memory/3468-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/3468-1-0x00000000007B0000-0x00000000008B0000-memory.dmp

        Filesize

        1024KB

      • memory/4820-18-0x0000000000400000-0x00000000005FB000-memory.dmp

        Filesize

        2.0MB

      • memory/4820-12-0x0000000000400000-0x00000000005FB000-memory.dmp

        Filesize

        2.0MB

      • memory/4820-13-0x0000000000400000-0x00000000005FB000-memory.dmp

        Filesize

        2.0MB

      • memory/4820-11-0x0000000000400000-0x00000000005FB000-memory.dmp

        Filesize

        2.0MB