Analysis

  • max time kernel
    149s
  • max time network
    149s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    17-04-2024 14:14

General

  • Target

    c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe

  • Size

    233KB

  • MD5

    9f72ad79bba9d398a150be4b676c624b

  • SHA1

    f06218c9fb624ba6a8040846c1a888e6dacc6fb6

  • SHA256

    c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981

  • SHA512

    bd7a919b1773115756c1b795fc3111132f7acd8290e2d82c25e6b6d03510bc61f7736c3b1fee2794bd3492e103121018d83565d2dea79287481b99f31bdbb393

  • SSDEEP

    3072:1oCTZcw8fGJiR21K9Np5Y4xL1JTp0C2bhUQiGkRo8DegwT:1ob/vFF2bhd8l

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 7 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe
    "C:\Users\Admin\AppData\Local\Temp\c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2400
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\pwzwvoqc\
      2⤵
        PID:2728
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\lxnaonfj.exe" C:\Windows\SysWOW64\pwzwvoqc\
        2⤵
          PID:2620
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create pwzwvoqc binPath= "C:\Windows\SysWOW64\pwzwvoqc\lxnaonfj.exe /d\"C:\Users\Admin\AppData\Local\Temp\c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2704
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description pwzwvoqc "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2884
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start pwzwvoqc
          2⤵
          • Launches sc.exe
          PID:2632
        • 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:2688
      • C:\Windows\SysWOW64\pwzwvoqc\lxnaonfj.exe
        C:\Windows\SysWOW64\pwzwvoqc\lxnaonfj.exe /d"C:\Users\Admin\AppData\Local\Temp\c5fe1e625c87aa811d76f20079f286f5b9f3b5c971d5ba86350c37327c509981.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2504
        • 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:2484

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        12.2MB

        MD5

        e75fa015aa949cb084aaa7719e6b6463

        SHA1

        4f23f977b635d19da83ec23eb4599c7f565cfc8f

        SHA256

        3aa7c1b8f5fd6821f7826888bde06358033b86fa94ad314ac84027f28b51c8b1

        SHA512

        e9b40c55bcc57e2261d43950f6159136ebea4c9c5cc26741bf53821657e382c9fec6776977ffbc262266fc7ed52afe20f5ad10cf35c0f2a6c0580034045c6b21

      • memory/2400-3-0x0000000000220000-0x0000000000233000-memory.dmp
        Filesize

        76KB

      • memory/2400-4-0x0000000000400000-0x000000000043F000-memory.dmp
        Filesize

        252KB

      • memory/2400-1-0x0000000000590000-0x0000000000690000-memory.dmp
        Filesize

        1024KB

      • memory/2400-7-0x0000000000400000-0x000000000043F000-memory.dmp
        Filesize

        252KB

      • memory/2484-43-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2484-42-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2484-11-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB

      • memory/2484-61-0x00000000000D0000-0x00000000000E5000-memory.dmp
        Filesize

        84KB

      • memory/2484-14-0x00000000000D0000-0x00000000000E5000-memory.dmp
        Filesize

        84KB

      • memory/2484-9-0x00000000000D0000-0x00000000000E5000-memory.dmp
        Filesize

        84KB

      • memory/2484-18-0x00000000000D0000-0x00000000000E5000-memory.dmp
        Filesize

        84KB

      • memory/2484-19-0x00000000000D0000-0x00000000000E5000-memory.dmp
        Filesize

        84KB

      • memory/2484-20-0x00000000000D0000-0x00000000000E5000-memory.dmp
        Filesize

        84KB

      • memory/2484-22-0x0000000001990000-0x0000000001B9F000-memory.dmp
        Filesize

        2.1MB

      • memory/2484-26-0x0000000000080000-0x0000000000086000-memory.dmp
        Filesize

        24KB

      • memory/2484-25-0x0000000001990000-0x0000000001B9F000-memory.dmp
        Filesize

        2.1MB

      • memory/2484-34-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2484-35-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2484-36-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2484-57-0x00000000001E0000-0x00000000001E7000-memory.dmp
        Filesize

        28KB

      • memory/2484-44-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2484-56-0x00000000059C0000-0x0000000005DCB000-memory.dmp
        Filesize

        4.0MB

      • memory/2484-45-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2484-52-0x00000000001D0000-0x00000000001D5000-memory.dmp
        Filesize

        20KB

      • memory/2484-53-0x00000000059C0000-0x0000000005DCB000-memory.dmp
        Filesize

        4.0MB

      • memory/2484-49-0x00000000001D0000-0x00000000001D5000-memory.dmp
        Filesize

        20KB

      • memory/2484-48-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2484-47-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2484-46-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2484-41-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2484-40-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2484-39-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2484-38-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2484-37-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2484-33-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2484-32-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2484-29-0x0000000000110000-0x0000000000120000-memory.dmp
        Filesize

        64KB

      • memory/2504-12-0x0000000000400000-0x000000000043F000-memory.dmp
        Filesize

        252KB

      • memory/2504-10-0x00000000008A0000-0x00000000009A0000-memory.dmp
        Filesize

        1024KB

      • memory/2504-15-0x0000000000400000-0x000000000043F000-memory.dmp
        Filesize

        252KB