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Analysis

  • max time kernel
    197s
  • max time network
    225s
  • platform
    windows7_x64
  • resource
    win7-20231023-en
  • resource tags

    arch:x64arch:x86image:win7-20231023-enlocale:en-usos:windows7-x64system
  • submitted
    17/11/2023, 15:49

General

  • Target

    file.exe

  • Size

    272KB

  • MD5

    76c98648f11970e09c160ae0224cb9f2

  • SHA1

    a1c7aa09a9ea241d69b8d378b98b64a7132b8929

  • SHA256

    de3cdc934393a5e4065690686ff7042e51f89efbcd15ca4df1f08dfcca8622f1

  • SHA512

    5e967565241c8d18f79e145e73df6050b480de31f40188d2cd70bd6a9d178c4fa93fcc1696ed7342bcf90b34a4a11168bd8a3852c626e97d636e0b60d03615ab

  • SSDEEP

    3072:yks08uYWLa6HVkluiY+BGzF88GK5ydpRsIgtCT6RsVip39iVR:DvTYivSxYTWXKypVipM

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
  • 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).

  • Modifies data under HKEY_USERS 5 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2636
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\bwelvvkp\
      2⤵
        PID:2652
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\nlvwyuxd.exe" C:\Windows\SysWOW64\bwelvvkp\
        2⤵
          PID:2768
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create bwelvvkp binPath= "C:\Windows\SysWOW64\bwelvvkp\nlvwyuxd.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2764
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description bwelvvkp "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2548
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start bwelvvkp
          2⤵
          • Launches sc.exe
          PID:2496
        • 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:2992
      • C:\Windows\SysWOW64\bwelvvkp\nlvwyuxd.exe
        C:\Windows\SysWOW64\bwelvvkp\nlvwyuxd.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2868
        • 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:2848

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        10.9MB

        MD5

        2e09e0a3fe96c74d1544725fc0e2bdc5

        SHA1

        37783a50f67c9c0e5f6aed1f954b1617c7708f13

        SHA256

        e0d668646852716da7e793678ae6c99a9e277bc038040f2f42d8d9e9ce0162b2

        SHA512

        c4a385e4cc3d785723d03a253925180543b893dd5c76621f6460f736861a774d40a361921d6e7f10b568be724bdd2d69de94437f04eeebba74029285c249f4cd

      • C:\Windows\SysWOW64\bwelvvkp\nlvwyuxd.exe

        Filesize

        10.9MB

        MD5

        2e09e0a3fe96c74d1544725fc0e2bdc5

        SHA1

        37783a50f67c9c0e5f6aed1f954b1617c7708f13

        SHA256

        e0d668646852716da7e793678ae6c99a9e277bc038040f2f42d8d9e9ce0162b2

        SHA512

        c4a385e4cc3d785723d03a253925180543b893dd5c76621f6460f736861a774d40a361921d6e7f10b568be724bdd2d69de94437f04eeebba74029285c249f4cd

      • memory/2636-1-0x00000000005F0000-0x00000000006F0000-memory.dmp

        Filesize

        1024KB

      • memory/2636-2-0x0000000000220000-0x0000000000233000-memory.dmp

        Filesize

        76KB

      • memory/2636-3-0x0000000000400000-0x00000000004F7000-memory.dmp

        Filesize

        988KB

      • memory/2636-4-0x0000000000400000-0x00000000004F7000-memory.dmp

        Filesize

        988KB

      • memory/2636-7-0x0000000000400000-0x00000000004F7000-memory.dmp

        Filesize

        988KB

      • memory/2636-8-0x00000000005F0000-0x00000000006F0000-memory.dmp

        Filesize

        1024KB

      • memory/2636-9-0x0000000000220000-0x0000000000233000-memory.dmp

        Filesize

        76KB

      • memory/2636-11-0x0000000000400000-0x00000000004F7000-memory.dmp

        Filesize

        988KB

      • memory/2848-47-0x00000000000C0000-0x00000000000D0000-memory.dmp

        Filesize

        64KB

      • memory/2848-41-0x00000000000C0000-0x00000000000D0000-memory.dmp

        Filesize

        64KB

      • memory/2848-19-0x0000000000080000-0x0000000000095000-memory.dmp

        Filesize

        84KB

      • memory/2848-17-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

        Filesize

        4KB

      • memory/2848-16-0x0000000000080000-0x0000000000095000-memory.dmp

        Filesize

        84KB

      • memory/2848-66-0x0000000000080000-0x0000000000095000-memory.dmp

        Filesize

        84KB

      • memory/2848-23-0x0000000000080000-0x0000000000095000-memory.dmp

        Filesize

        84KB

      • memory/2848-24-0x0000000000080000-0x0000000000095000-memory.dmp

        Filesize

        84KB

      • memory/2848-25-0x0000000000080000-0x0000000000095000-memory.dmp

        Filesize

        84KB

      • memory/2848-27-0x0000000001880000-0x0000000001A8F000-memory.dmp

        Filesize

        2.1MB

      • memory/2848-30-0x0000000001880000-0x0000000001A8F000-memory.dmp

        Filesize

        2.1MB

      • memory/2848-31-0x00000000000B0000-0x00000000000B6000-memory.dmp

        Filesize

        24KB

      • memory/2848-34-0x00000000000C0000-0x00000000000D0000-memory.dmp

        Filesize

        64KB

      • memory/2848-37-0x00000000000C0000-0x00000000000D0000-memory.dmp

        Filesize

        64KB

      • memory/2848-38-0x00000000000C0000-0x00000000000D0000-memory.dmp

        Filesize

        64KB

      • memory/2848-39-0x00000000000C0000-0x00000000000D0000-memory.dmp

        Filesize

        64KB

      • memory/2848-40-0x00000000000C0000-0x00000000000D0000-memory.dmp

        Filesize

        64KB

      • memory/2848-62-0x0000000000AB0000-0x0000000000AB7000-memory.dmp

        Filesize

        28KB

      • memory/2848-42-0x00000000000C0000-0x00000000000D0000-memory.dmp

        Filesize

        64KB

      • memory/2848-43-0x00000000000C0000-0x00000000000D0000-memory.dmp

        Filesize

        64KB

      • memory/2848-44-0x00000000000C0000-0x00000000000D0000-memory.dmp

        Filesize

        64KB

      • memory/2848-45-0x00000000000C0000-0x00000000000D0000-memory.dmp

        Filesize

        64KB

      • memory/2848-46-0x00000000000C0000-0x00000000000D0000-memory.dmp

        Filesize

        64KB

      • memory/2848-61-0x0000000005440000-0x000000000584B000-memory.dmp

        Filesize

        4.0MB

      • memory/2848-48-0x00000000000C0000-0x00000000000D0000-memory.dmp

        Filesize

        64KB

      • memory/2848-49-0x00000000000C0000-0x00000000000D0000-memory.dmp

        Filesize

        64KB

      • memory/2848-50-0x00000000000C0000-0x00000000000D0000-memory.dmp

        Filesize

        64KB

      • memory/2848-51-0x00000000000C0000-0x00000000000D0000-memory.dmp

        Filesize

        64KB

      • memory/2848-52-0x00000000000C0000-0x00000000000D0000-memory.dmp

        Filesize

        64KB

      • memory/2848-53-0x00000000000C0000-0x00000000000D0000-memory.dmp

        Filesize

        64KB

      • memory/2848-54-0x00000000000D0000-0x00000000000D5000-memory.dmp

        Filesize

        20KB

      • memory/2848-57-0x00000000000D0000-0x00000000000D5000-memory.dmp

        Filesize

        20KB

      • memory/2848-58-0x0000000005440000-0x000000000584B000-memory.dmp

        Filesize

        4.0MB

      • memory/2868-14-0x00000000005A0000-0x00000000006A0000-memory.dmp

        Filesize

        1024KB

      • memory/2868-15-0x0000000000400000-0x00000000004F7000-memory.dmp

        Filesize

        988KB

      • memory/2868-20-0x0000000000400000-0x00000000004F7000-memory.dmp

        Filesize

        988KB