Analysis

  • max time kernel
    146s
  • max time network
    149s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    23-09-2024 18:17

General

  • Target

    rXTqHar5Ud.exe

  • Size

    397KB

  • MD5

    f403202fb853377ceb67200005ef95b8

  • SHA1

    1840e1495486209e92e5230cf1406f31a02699e7

  • SHA256

    3eebf917efa82ea7b81f37e9f8c98a702254c5f0a487667a72e78d53a61ce363

  • SHA512

    13b130d6f2ac8be444e16d4b1116812179d5043912a7aa24bd0d566eeecf4447be09fd54266dc12ff1902569d048c93a2d0c827abc135b0159f8156c18f9bf7a

  • SSDEEP

    6144:7BYOcLH6/xNtFxaS3DpwmEIey0bGWEbje2bkln5eOy8:76Ocb6/r/xv2GWaeaklQT8

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
  • Looks up external IP address via web service 2 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • 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\rXTqHar5Ud.exe
    "C:\Users\Admin\AppData\Local\Temp\rXTqHar5Ud.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2988
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\rvxrzkii\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:1896
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\auumpzdp.exe" C:\Windows\SysWOW64\rvxrzkii\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3524
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create rvxrzkii binPath= "C:\Windows\SysWOW64\rvxrzkii\auumpzdp.exe /d\"C:\Users\Admin\AppData\Local\Temp\rXTqHar5Ud.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:1360
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description rvxrzkii "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4564
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start rvxrzkii
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2152
    • 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:1392
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2988 -s 1044
      2⤵
      • Program crash
      PID:4224
  • C:\Windows\SysWOW64\rvxrzkii\auumpzdp.exe
    C:\Windows\SysWOW64\rvxrzkii\auumpzdp.exe /d"C:\Users\Admin\AppData\Local\Temp\rXTqHar5Ud.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:1892
    • 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:4400
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 1892 -s 536
      2⤵
      • Program crash
      PID:2420
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 2988 -ip 2988
    1⤵
      PID:1712
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 412 -p 1892 -ip 1892
      1⤵
        PID:3460

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

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

        Filesize

        14.5MB

        MD5

        e30808d178c5406e7e08bae69ec89233

        SHA1

        72d01320b4873c10f7bdafc362cabb7a89a65fb5

        SHA256

        0dbf88cc067da8bb92dd12274f6c81c660197d3e754aef51319a2759f8127f4b

        SHA512

        f8bf96d71adc683d67cf7046b047cb9e75b57e1968f8f946fa3d851ecaacc4151fab6715fd7526bd1b5ac5a1fc9d38c4e971a90cb40ef8b98681b4fc8d10491e

      • memory/1892-15-0x0000000000400000-0x000000000247B000-memory.dmp

        Filesize

        32.5MB

      • memory/2988-2-0x0000000002540000-0x0000000002553000-memory.dmp

        Filesize

        76KB

      • memory/2988-3-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/2988-9-0x0000000000400000-0x0000000000415000-memory.dmp

        Filesize

        84KB

      • memory/2988-8-0x0000000002540000-0x0000000002553000-memory.dmp

        Filesize

        76KB

      • memory/2988-7-0x0000000000400000-0x000000000247B000-memory.dmp

        Filesize

        32.5MB

      • memory/2988-1-0x0000000002560000-0x0000000002660000-memory.dmp

        Filesize

        1024KB

      • memory/4400-40-0x0000000001F50000-0x0000000001F60000-memory.dmp

        Filesize

        64KB

      • memory/4400-35-0x0000000001F50000-0x0000000001F60000-memory.dmp

        Filesize

        64KB

      • memory/4400-13-0x0000000000A90000-0x0000000000AA5000-memory.dmp

        Filesize

        84KB

      • memory/4400-47-0x0000000001FE0000-0x0000000001FE5000-memory.dmp

        Filesize

        20KB

      • memory/4400-52-0x0000000001FF0000-0x0000000001FF7000-memory.dmp

        Filesize

        28KB

      • memory/4400-48-0x0000000007680000-0x0000000007A8B000-memory.dmp

        Filesize

        4.0MB

      • memory/4400-43-0x0000000001F50000-0x0000000001F60000-memory.dmp

        Filesize

        64KB

      • memory/4400-44-0x0000000001FE0000-0x0000000001FE5000-memory.dmp

        Filesize

        20KB

      • memory/4400-42-0x0000000001F50000-0x0000000001F60000-memory.dmp

        Filesize

        64KB

      • memory/4400-41-0x0000000001F50000-0x0000000001F60000-memory.dmp

        Filesize

        64KB

      • memory/4400-11-0x0000000000A90000-0x0000000000AA5000-memory.dmp

        Filesize

        84KB

      • memory/4400-39-0x0000000001F50000-0x0000000001F60000-memory.dmp

        Filesize

        64KB

      • memory/4400-38-0x0000000001F50000-0x0000000001F60000-memory.dmp

        Filesize

        64KB

      • memory/4400-37-0x0000000001F50000-0x0000000001F60000-memory.dmp

        Filesize

        64KB

      • memory/4400-36-0x0000000001F50000-0x0000000001F60000-memory.dmp

        Filesize

        64KB

      • memory/4400-14-0x0000000000A90000-0x0000000000AA5000-memory.dmp

        Filesize

        84KB

      • memory/4400-34-0x0000000001F50000-0x0000000001F60000-memory.dmp

        Filesize

        64KB

      • memory/4400-33-0x0000000001F50000-0x0000000001F60000-memory.dmp

        Filesize

        64KB

      • memory/4400-32-0x0000000001F50000-0x0000000001F60000-memory.dmp

        Filesize

        64KB

      • memory/4400-31-0x0000000001F50000-0x0000000001F60000-memory.dmp

        Filesize

        64KB

      • memory/4400-30-0x0000000001F50000-0x0000000001F60000-memory.dmp

        Filesize

        64KB

      • memory/4400-29-0x0000000001F50000-0x0000000001F60000-memory.dmp

        Filesize

        64KB

      • memory/4400-28-0x0000000001F50000-0x0000000001F60000-memory.dmp

        Filesize

        64KB

      • memory/4400-27-0x0000000001F50000-0x0000000001F60000-memory.dmp

        Filesize

        64KB

      • memory/4400-24-0x0000000001F50000-0x0000000001F60000-memory.dmp

        Filesize

        64KB

      • memory/4400-21-0x0000000000DF0000-0x0000000000DF6000-memory.dmp

        Filesize

        24KB

      • memory/4400-20-0x0000000002800000-0x0000000002A0F000-memory.dmp

        Filesize

        2.1MB

      • memory/4400-18-0x0000000002800000-0x0000000002A0F000-memory.dmp

        Filesize

        2.1MB

      • memory/4400-51-0x0000000007680000-0x0000000007A8B000-memory.dmp

        Filesize

        4.0MB