Analysis

  • max time kernel
    148s
  • max time network
    151s
  • platform
    windows7_x64
  • resource
    win7-20231129-en
  • resource tags

    arch:x64arch:x86image:win7-20231129-enlocale:en-usos:windows7-x64system
  • submitted
    17-04-2024 13:32

General

  • Target

    466a5771af26f4655cb6cfcf5616aa2acc11c58226bf440a7d0bb29f3a88968c.exe

  • Size

    317KB

  • MD5

    8cc6aec77fca66fc44286a1519bae1ee

  • SHA1

    35b395341b0b103bf511d653b05921dc89370a65

  • SHA256

    466a5771af26f4655cb6cfcf5616aa2acc11c58226bf440a7d0bb29f3a88968c

  • SHA512

    de7e960bd1204ef301828d970764e2161cef622d529db3f8f3b001656ed01dc9d890b6e9ef385ebf0f57187fb9c62c064b8804d800a685dec9fa715fcfe3bd51

  • SSDEEP

    6144:03BH8F8MzN7YBmGXZrNcyzpulx2x1dmv56:0xH8OMzWBLZ+yzQ3srW4

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 6 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\466a5771af26f4655cb6cfcf5616aa2acc11c58226bf440a7d0bb29f3a88968c.exe
    "C:\Users\Admin\AppData\Local\Temp\466a5771af26f4655cb6cfcf5616aa2acc11c58226bf440a7d0bb29f3a88968c.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2088
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\fygqxwcc\
      2⤵
        PID:1656
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\iuczfsyw.exe" C:\Windows\SysWOW64\fygqxwcc\
        2⤵
          PID:2948
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create fygqxwcc binPath= "C:\Windows\SysWOW64\fygqxwcc\iuczfsyw.exe /d\"C:\Users\Admin\AppData\Local\Temp\466a5771af26f4655cb6cfcf5616aa2acc11c58226bf440a7d0bb29f3a88968c.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:672
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description fygqxwcc "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2632
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start fygqxwcc
          2⤵
          • Launches sc.exe
          PID:2724
        • 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:2560
      • C:\Windows\SysWOW64\fygqxwcc\iuczfsyw.exe
        C:\Windows\SysWOW64\fygqxwcc\iuczfsyw.exe /d"C:\Users\Admin\AppData\Local\Temp\466a5771af26f4655cb6cfcf5616aa2acc11c58226bf440a7d0bb29f3a88968c.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2452
        • 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:2492

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

      • C:\Users\Admin\AppData\Local\Temp\iuczfsyw.exe
        Filesize

        13.9MB

        MD5

        b007b3bdd73ed204be1eff3fe7bdace0

        SHA1

        cea1c50b38e7789216852ffc10f39e0ad0342bc8

        SHA256

        fe7d8cae15456f608d706064be9365c1fbf50b0ce7c39d5079fc407f38dad973

        SHA512

        e31253e36d5072872f200f5f1bc59e18d14253f0a6488b6e1f79e684722e1741fc2b24b2ee732fe21cf1ee805a4026ded20d7960e555afcf3829ab35e64c118d

      • memory/2088-1-0x0000000000990000-0x0000000000A90000-memory.dmp
        Filesize

        1024KB

      • memory/2088-4-0x0000000000400000-0x00000000007D9000-memory.dmp
        Filesize

        3.8MB

      • memory/2088-7-0x0000000000400000-0x00000000007D9000-memory.dmp
        Filesize

        3.8MB

      • memory/2088-3-0x0000000000220000-0x0000000000233000-memory.dmp
        Filesize

        76KB

      • memory/2452-15-0x0000000000400000-0x00000000007D9000-memory.dmp
        Filesize

        3.8MB

      • memory/2452-9-0x00000000009A0000-0x0000000000AA0000-memory.dmp
        Filesize

        1024KB

      • memory/2452-11-0x0000000000400000-0x00000000007D9000-memory.dmp
        Filesize

        3.8MB

      • memory/2492-35-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2492-40-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2492-10-0x00000000000C0000-0x00000000000D5000-memory.dmp
        Filesize

        84KB

      • memory/2492-18-0x00000000000C0000-0x00000000000D5000-memory.dmp
        Filesize

        84KB

      • memory/2492-19-0x00000000000C0000-0x00000000000D5000-memory.dmp
        Filesize

        84KB

      • memory/2492-20-0x00000000000C0000-0x00000000000D5000-memory.dmp
        Filesize

        84KB

      • memory/2492-22-0x00000000000C0000-0x00000000000D5000-memory.dmp
        Filesize

        84KB

      • memory/2492-24-0x0000000001D80000-0x0000000001F8F000-memory.dmp
        Filesize

        2.1MB

      • memory/2492-27-0x0000000001D80000-0x0000000001F8F000-memory.dmp
        Filesize

        2.1MB

      • memory/2492-28-0x0000000000170000-0x0000000000176000-memory.dmp
        Filesize

        24KB

      • memory/2492-31-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2492-34-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2492-12-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB

      • memory/2492-36-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2492-37-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2492-38-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2492-39-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2492-14-0x00000000000C0000-0x00000000000D5000-memory.dmp
        Filesize

        84KB

      • memory/2492-41-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2492-43-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2492-42-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2492-44-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2492-46-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2492-45-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2492-47-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2492-49-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2492-48-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2492-50-0x00000000001A0000-0x00000000001B0000-memory.dmp
        Filesize

        64KB

      • memory/2492-51-0x00000000001C0000-0x00000000001C5000-memory.dmp
        Filesize

        20KB

      • memory/2492-54-0x00000000001C0000-0x00000000001C5000-memory.dmp
        Filesize

        20KB

      • memory/2492-55-0x0000000005B60000-0x0000000005F6B000-memory.dmp
        Filesize

        4.0MB

      • memory/2492-58-0x0000000005B60000-0x0000000005F6B000-memory.dmp
        Filesize

        4.0MB

      • memory/2492-59-0x00000000001D0000-0x00000000001D7000-memory.dmp
        Filesize

        28KB