Analysis

  • max time kernel
    148s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
  • submitted
    14/01/2024, 15:18

General

  • Target
    SecuriteInfo.com.Win32.BotX-gen.31335.5127.exe
  • Size 203KB
  • Sample240114-splkzacfc2
  • SHA256 3555ecd8bb270312994e03bf64695a3f1c0213a2abf85b890ebe2bb40a9648a3
  • 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) 1 TTPs
  • Modifies Windows Firewall 1 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).

  • Program crash 2 IoCs
  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\SecuriteInfo.com.Win32.BotX-gen.31335.5127.exe
    "C:\Users\Admin\AppData\Local\Temp\SecuriteInfo.com.Win32.BotX-gen.31335.5127.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2504
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hbultyea\
      2⤵
        PID:4992
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\pewdigld.exe" C:\Windows\SysWOW64\hbultyea\
        2⤵
          PID:2536
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create hbultyea binPath= "C:\Windows\SysWOW64\hbultyea\pewdigld.exe /d\"C:\Users\Admin\AppData\Local\Temp\SecuriteInfo.com.Win32.BotX-gen.31335.5127.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1156
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description hbultyea "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1080
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start hbultyea
          2⤵
          • Launches sc.exe
          PID:3392
        • 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
          PID:3172
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2504 -s 1036
          2⤵
          • Program crash
          PID:708
      • C:\Windows\SysWOW64\hbultyea\pewdigld.exe
        C:\Windows\SysWOW64\hbultyea\pewdigld.exe /d"C:\Users\Admin\AppData\Local\Temp\SecuriteInfo.com.Win32.BotX-gen.31335.5127.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3852
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:3848
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3852 -s 528
          2⤵
          • Program crash
          PID:4168
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2504 -ip 2504
        1⤵
          PID:4288
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 3852 -ip 3852
          1⤵
            PID:1744

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

                pewdigld.exe

                • Path C:\Users\Admin\AppData\Local\Temp\pewdigld.exe
                • Size 13.3MB
                • SHA256 43612f37f40010b4dab441628f7c3d5e00b42e8224b175575b9e7777dd061df1
                • MD5 SHA1 SHA512 SSDEEP

                pewdigld.exe

                • Path C:\Windows\SysWOW64\hbultyea\pewdigld.exe
                • Size 512KB
                • SHA256 8c48a0427bf1166244e3ff131e8b259334fcfcaba6cff72e8649f50a0a236336
                • MD5 SHA1 SHA512 SSDEEP

                memory/2504-16-0x0000000000400000-0x0000000000438000-memory.dmp

                memory/2504-2-0x00000000021B0000-0x00000000021C3000-memory.dmp

                memory/2504-3-0x0000000000400000-0x0000000000438000-memory.dmp

                memory/2504-1-0x00000000004D0000-0x00000000005D0000-memory.dmp

                memory/3848-31-0x0000000002380000-0x0000000002390000-memory.dmp

                memory/3848-33-0x0000000002380000-0x0000000002390000-memory.dmp

                memory/3848-59-0x0000000000DC0000-0x0000000000DD5000-memory.dmp

                memory/3848-14-0x0000000000DC0000-0x0000000000DD5000-memory.dmp

                memory/3848-10-0x0000000000DC0000-0x0000000000DD5000-memory.dmp

                memory/3848-55-0x00000000023E0000-0x00000000023E7000-memory.dmp

                memory/3848-17-0x0000000000DC0000-0x0000000000DD5000-memory.dmp

                memory/3848-18-0x0000000000DC0000-0x0000000000DD5000-memory.dmp

                memory/3848-20-0x0000000002C00000-0x0000000002E0F000-memory.dmp

                memory/3848-23-0x0000000002C00000-0x0000000002E0F000-memory.dmp

                memory/3848-24-0x0000000002370000-0x0000000002376000-memory.dmp

                memory/3848-27-0x0000000002380000-0x0000000002390000-memory.dmp

                memory/3848-30-0x0000000002380000-0x0000000002390000-memory.dmp

                memory/3848-32-0x0000000002380000-0x0000000002390000-memory.dmp

                memory/3848-54-0x0000000007C00000-0x000000000800B000-memory.dmp

                memory/3848-35-0x0000000002380000-0x0000000002390000-memory.dmp

                memory/3848-34-0x0000000002380000-0x0000000002390000-memory.dmp

                memory/3848-39-0x0000000002380000-0x0000000002390000-memory.dmp

                memory/3848-36-0x0000000002380000-0x0000000002390000-memory.dmp

                memory/3848-37-0x0000000002380000-0x0000000002390000-memory.dmp

                memory/3848-41-0x0000000002380000-0x0000000002390000-memory.dmp

                memory/3848-42-0x0000000002380000-0x0000000002390000-memory.dmp

                memory/3848-44-0x0000000002380000-0x0000000002390000-memory.dmp

                memory/3848-40-0x0000000002380000-0x0000000002390000-memory.dmp

                memory/3848-45-0x0000000002380000-0x0000000002390000-memory.dmp

                memory/3848-47-0x00000000023D0000-0x00000000023D5000-memory.dmp

                memory/3848-46-0x0000000002380000-0x0000000002390000-memory.dmp

                memory/3848-50-0x00000000023D0000-0x00000000023D5000-memory.dmp

                memory/3848-51-0x0000000007C00000-0x000000000800B000-memory.dmp

                memory/3848-43-0x0000000002380000-0x0000000002390000-memory.dmp

                memory/3848-38-0x0000000002380000-0x0000000002390000-memory.dmp

                memory/3852-9-0x0000000000590000-0x00000000005A3000-memory.dmp

                memory/3852-8-0x00000000006F0000-0x00000000007F0000-memory.dmp

                memory/3852-15-0x0000000000400000-0x0000000000438000-memory.dmp

                memory/3852-12-0x0000000000400000-0x0000000000438000-memory.dmp