Analysis

  • max time kernel
    145s
  • max time network
    148s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    24/09/2024, 04:33

General

  • Target
    ad47fc74baa9ccd6f9b004a990b27393eba378eff2dcc7e2de3ce2b95501c7f4.exe
  • Size 14.1MB
  • Sample240924-e6m88sxblb
  • SHA256 ad47fc74baa9ccd6f9b004a990b27393eba378eff2dcc7e2de3ce2b95501c7f4
  • MD5 SHA1 SHA512 SSDEEP

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\ad47fc74baa9ccd6f9b004a990b27393eba378eff2dcc7e2de3ce2b95501c7f4.exe
    "C:\Users\Admin\AppData\Local\Temp\ad47fc74baa9ccd6f9b004a990b27393eba378eff2dcc7e2de3ce2b95501c7f4.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3436
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ezlfidod\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2672
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\wqqilvzl.exe" C:\Windows\SysWOW64\ezlfidod\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:4376
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create ezlfidod binPath= "C:\Windows\SysWOW64\ezlfidod\wqqilvzl.exe /d\"C:\Users\Admin\AppData\Local\Temp\ad47fc74baa9ccd6f9b004a990b27393eba378eff2dcc7e2de3ce2b95501c7f4.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:2272
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description ezlfidod "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3340
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start ezlfidod
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:4888
    • 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:3696
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3436 -s 1308
      2⤵
      • Program crash
      PID:2316
  • C:\Windows\SysWOW64\ezlfidod\wqqilvzl.exe
    C:\Windows\SysWOW64\ezlfidod\wqqilvzl.exe /d"C:\Users\Admin\AppData\Local\Temp\ad47fc74baa9ccd6f9b004a990b27393eba378eff2dcc7e2de3ce2b95501c7f4.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3748
    • 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:3108
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3748 -s 520
      2⤵
      • Program crash
      PID:544
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 3748 -ip 3748
    1⤵
      PID:3920
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 504 -p 3436 -ip 3436
      1⤵
        PID:3120

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

            wqqilvzl.exe

            • Path C:\Users\Admin\AppData\Local\Temp\wqqilvzl.exe
            • Size 14.3MB
            • SHA256 e39816173300f285acfb3b8bcb7cdd190ed4637d8993d43fd5f9724837734afa
            • MD5 SHA1 SHA512 SSDEEP

            memory/3108-39-0x00000000025E0000-0x00000000025F0000-memory.dmp

            memory/3108-40-0x00000000025E0000-0x00000000025F0000-memory.dmp

            memory/3108-24-0x0000000002E00000-0x000000000300F000-memory.dmp

            memory/3108-10-0x0000000001260000-0x0000000001275000-memory.dmp

            memory/3108-26-0x0000000002E00000-0x000000000300F000-memory.dmp

            memory/3108-27-0x00000000013F0000-0x00000000013F6000-memory.dmp

            memory/3108-13-0x0000000001260000-0x0000000001275000-memory.dmp

            memory/3108-30-0x00000000025E0000-0x00000000025F0000-memory.dmp

            memory/3108-33-0x00000000025E0000-0x00000000025F0000-memory.dmp

            memory/3108-34-0x00000000025E0000-0x00000000025F0000-memory.dmp

            memory/3108-35-0x00000000025E0000-0x00000000025F0000-memory.dmp

            memory/3108-19-0x0000000001260000-0x0000000001275000-memory.dmp

            memory/3108-20-0x0000000001260000-0x0000000001275000-memory.dmp

            memory/3108-22-0x0000000001260000-0x0000000001275000-memory.dmp

            memory/3108-50-0x00000000025F0000-0x00000000025F5000-memory.dmp

            memory/3108-58-0x00000000033D0000-0x00000000033D7000-memory.dmp

            memory/3108-57-0x0000000007E40000-0x000000000824B000-memory.dmp

            memory/3108-54-0x0000000007E40000-0x000000000824B000-memory.dmp

            memory/3108-36-0x00000000025E0000-0x00000000025F0000-memory.dmp

            memory/3108-49-0x00000000025E0000-0x00000000025F0000-memory.dmp

            memory/3108-43-0x00000000025E0000-0x00000000025F0000-memory.dmp

            memory/3108-47-0x00000000025E0000-0x00000000025F0000-memory.dmp

            memory/3108-46-0x00000000025E0000-0x00000000025F0000-memory.dmp

            memory/3108-45-0x00000000025E0000-0x00000000025F0000-memory.dmp

            memory/3108-44-0x00000000025E0000-0x00000000025F0000-memory.dmp

            memory/3108-48-0x00000000025E0000-0x00000000025F0000-memory.dmp

            memory/3108-42-0x00000000025E0000-0x00000000025F0000-memory.dmp

            memory/3108-41-0x00000000025E0000-0x00000000025F0000-memory.dmp

            memory/3108-53-0x00000000025F0000-0x00000000025F5000-memory.dmp

            memory/3108-37-0x00000000025E0000-0x00000000025F0000-memory.dmp

            memory/3108-38-0x00000000025E0000-0x00000000025F0000-memory.dmp

            memory/3436-1-0x00000000008D0000-0x00000000009D0000-memory.dmp

            memory/3436-3-0x0000000000400000-0x0000000000415000-memory.dmp

            memory/3436-14-0x0000000000400000-0x0000000000683000-memory.dmp

            memory/3436-15-0x00000000007E0000-0x00000000007F3000-memory.dmp

            memory/3436-16-0x0000000000400000-0x0000000000415000-memory.dmp

            memory/3436-2-0x00000000007E0000-0x00000000007F3000-memory.dmp

            memory/3748-18-0x0000000000400000-0x0000000000683000-memory.dmp

            memory/3748-8-0x0000000000400000-0x0000000000683000-memory.dmp

            memory/3748-9-0x0000000000400000-0x0000000000683000-memory.dmp