Analysis

  • max time kernel
    142s
  • max time network
    147s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    17-04-2024 13:33

General

  • Target

    bf1da149d7e5da9a8a4908039856414e838db0a32129dcad45b6c737ec92d408.exe

  • Size

    290KB

  • MD5

    d2bf0c77c70900657d7c919282b90136

  • SHA1

    dc50e45c6aabad5b672af625f5449a0f50a36116

  • SHA256

    bf1da149d7e5da9a8a4908039856414e838db0a32129dcad45b6c737ec92d408

  • SHA512

    aee9a3d7862c25205432c39e61517d2d191a067dc2da79a627c6d228875cf32960d8cbe041d51ed0cf585ffe8b030f30b0e6df49653babb2967c5f4c49febab1

  • SSDEEP

    6144:j7ol2UY55+0U4C/yHwyHkXdfLhBbjLp6:j80+0U4C6GXLBbI

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.

  • Windows security bypass 2 TTPs 1 IoCs
  • Creates new service(s) 1 TTPs
  • Modifies Windows Firewall 2 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 3 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\bf1da149d7e5da9a8a4908039856414e838db0a32129dcad45b6c737ec92d408.exe
    "C:\Users\Admin\AppData\Local\Temp\bf1da149d7e5da9a8a4908039856414e838db0a32129dcad45b6c737ec92d408.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1752
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\kscnzkbi\
      2⤵
        PID:2928
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\uxqbbkll.exe" C:\Windows\SysWOW64\kscnzkbi\
        2⤵
          PID:3040
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create kscnzkbi binPath= "C:\Windows\SysWOW64\kscnzkbi\uxqbbkll.exe /d\"C:\Users\Admin\AppData\Local\Temp\bf1da149d7e5da9a8a4908039856414e838db0a32129dcad45b6c737ec92d408.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2644
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description kscnzkbi "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2260
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start kscnzkbi
          2⤵
          • Launches sc.exe
          PID:2840
        • 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:2660
      • C:\Windows\SysWOW64\kscnzkbi\uxqbbkll.exe
        C:\Windows\SysWOW64\kscnzkbi\uxqbbkll.exe /d"C:\Users\Admin\AppData\Local\Temp\bf1da149d7e5da9a8a4908039856414e838db0a32129dcad45b6c737ec92d408.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2460
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Windows security bypass
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:2468

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        14.2MB

        MD5

        d4fdd6991618b114381f5a55e2c1d992

        SHA1

        e7ec4c6046f45fb6b776db2198b5f96247cfde32

        SHA256

        503ca386be5c7abb64b852c242f955158486a332b7c8d955e80cc856121c03b3

        SHA512

        76859358481f38f8070d2c438fcfad4cbb7369dd0f91f15a3025232d95c507dee412feaa0f3c8022de74ae77c209c68f45c8a6ad53f3848488f163d0f0ee993e

      • memory/1752-1-0x00000000008F0000-0x00000000009F0000-memory.dmp

        Filesize

        1024KB

      • memory/1752-2-0x0000000000220000-0x0000000000233000-memory.dmp

        Filesize

        76KB

      • memory/1752-4-0x0000000000400000-0x00000000007D1000-memory.dmp

        Filesize

        3.8MB

      • memory/1752-7-0x0000000000400000-0x00000000007D1000-memory.dmp

        Filesize

        3.8MB

      • memory/1752-8-0x0000000000220000-0x0000000000233000-memory.dmp

        Filesize

        76KB

      • memory/2460-16-0x0000000000400000-0x00000000007D1000-memory.dmp

        Filesize

        3.8MB

      • memory/2460-11-0x0000000000400000-0x00000000007D1000-memory.dmp

        Filesize

        3.8MB

      • memory/2460-10-0x00000000002F0000-0x00000000003F0000-memory.dmp

        Filesize

        1024KB

      • memory/2468-15-0x00000000000C0000-0x00000000000D5000-memory.dmp

        Filesize

        84KB

      • memory/2468-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

        Filesize

        4KB

      • memory/2468-19-0x00000000000C0000-0x00000000000D5000-memory.dmp

        Filesize

        84KB

      • memory/2468-12-0x00000000000C0000-0x00000000000D5000-memory.dmp

        Filesize

        84KB

      • memory/2468-20-0x00000000000C0000-0x00000000000D5000-memory.dmp

        Filesize

        84KB

      • memory/2468-21-0x00000000000C0000-0x00000000000D5000-memory.dmp

        Filesize

        84KB

      • memory/2468-23-0x00000000000C0000-0x00000000000D5000-memory.dmp

        Filesize

        84KB