Analysis

  • max time kernel
    152s
  • max time network
    158s
  • 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, 15:17

General

  • Target
    SecuriteInfo.com.Win32.BotX-gen.31335.exe
  • Size 203KB
  • Sample240114-spe37acfb9
  • 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.exe
    "C:\Users\Admin\AppData\Local\Temp\SecuriteInfo.com.Win32.BotX-gen.31335.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4148
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\moxlxjak\
      2⤵
        PID:2652
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\pffcoaqo.exe" C:\Windows\SysWOW64\moxlxjak\
        2⤵
          PID:2144
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create moxlxjak binPath= "C:\Windows\SysWOW64\moxlxjak\pffcoaqo.exe /d\"C:\Users\Admin\AppData\Local\Temp\SecuriteInfo.com.Win32.BotX-gen.31335.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3796
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description moxlxjak "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4792
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start moxlxjak
          2⤵
          • Launches sc.exe
          PID:1084
        • 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:3992
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4148 -s 676
          2⤵
          • Program crash
          PID:2468
      • C:\Windows\SysWOW64\moxlxjak\pffcoaqo.exe
        C:\Windows\SysWOW64\moxlxjak\pffcoaqo.exe /d"C:\Users\Admin\AppData\Local\Temp\SecuriteInfo.com.Win32.BotX-gen.31335.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3532
        • 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:2460
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3532 -s 528
          2⤵
          • Program crash
          PID:4548
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 3532 -ip 3532
        1⤵
          PID:484
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 4148 -ip 4148
          1⤵
            PID:1724

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

                pffcoaqo.exe

                • Path C:\Users\Admin\AppData\Local\Temp\pffcoaqo.exe
                • Size 14.1MB
                • SHA256 3380502e940914c13ccdef2156b615e5a28d41c3087ac61d91b9f034a4daec5a
                • MD5 SHA1 SHA512 SSDEEP

                pffcoaqo.exe

                • Path C:\Windows\SysWOW64\moxlxjak\pffcoaqo.exe
                • Size 2.9MB
                • SHA256 ef542e6fbe0e9884517633c3bdf19570170ae1732161907e7be25cca79eeebe7
                • MD5 SHA1 SHA512 SSDEEP

                memory/2460-42-0x00000000025F0000-0x0000000002600000-memory.dmp

                memory/2460-30-0x00000000025F0000-0x0000000002600000-memory.dmp

                memory/2460-59-0x0000000001270000-0x0000000001285000-memory.dmp

                memory/2460-55-0x00000000033E0000-0x00000000033E7000-memory.dmp

                memory/2460-54-0x0000000007E40000-0x000000000824B000-memory.dmp

                memory/2460-10-0x0000000001270000-0x0000000001285000-memory.dmp

                memory/2460-13-0x0000000001270000-0x0000000001285000-memory.dmp

                memory/2460-51-0x0000000007E40000-0x000000000824B000-memory.dmp

                memory/2460-50-0x00000000033D0000-0x00000000033D5000-memory.dmp

                memory/2460-45-0x00000000025F0000-0x0000000002600000-memory.dmp

                memory/2460-17-0x0000000001270000-0x0000000001285000-memory.dmp

                memory/2460-18-0x0000000001270000-0x0000000001285000-memory.dmp

                memory/2460-20-0x0000000002E00000-0x000000000300F000-memory.dmp

                memory/2460-23-0x0000000002E00000-0x000000000300F000-memory.dmp

                memory/2460-24-0x00000000025E0000-0x00000000025E6000-memory.dmp

                memory/2460-27-0x00000000025F0000-0x0000000002600000-memory.dmp

                memory/2460-31-0x00000000025F0000-0x0000000002600000-memory.dmp

                memory/2460-32-0x00000000025F0000-0x0000000002600000-memory.dmp

                memory/2460-47-0x00000000033D0000-0x00000000033D5000-memory.dmp

                memory/2460-33-0x00000000025F0000-0x0000000002600000-memory.dmp

                memory/2460-37-0x00000000025F0000-0x0000000002600000-memory.dmp

                memory/2460-35-0x00000000025F0000-0x0000000002600000-memory.dmp

                memory/2460-36-0x00000000025F0000-0x0000000002600000-memory.dmp

                memory/2460-34-0x00000000025F0000-0x0000000002600000-memory.dmp

                memory/2460-39-0x00000000025F0000-0x0000000002600000-memory.dmp

                memory/2460-38-0x00000000025F0000-0x0000000002600000-memory.dmp

                memory/2460-40-0x00000000025F0000-0x0000000002600000-memory.dmp

                memory/2460-41-0x00000000025F0000-0x0000000002600000-memory.dmp

                memory/2460-46-0x00000000025F0000-0x0000000002600000-memory.dmp

                memory/2460-43-0x00000000025F0000-0x0000000002600000-memory.dmp

                memory/2460-44-0x00000000025F0000-0x0000000002600000-memory.dmp

                memory/3532-15-0x0000000000C00000-0x0000000000C13000-memory.dmp

                memory/3532-14-0x0000000000400000-0x0000000000438000-memory.dmp

                memory/3532-9-0x0000000000400000-0x0000000000438000-memory.dmp

                memory/3532-8-0x00000000007D0000-0x00000000008D0000-memory.dmp

                memory/4148-1-0x00000000004F0000-0x00000000005F0000-memory.dmp

                memory/4148-3-0x0000000000400000-0x0000000000438000-memory.dmp

                memory/4148-16-0x0000000000400000-0x0000000000438000-memory.dmp

                memory/4148-2-0x0000000002190000-0x00000000021A3000-memory.dmp