Analysis

  • max time kernel
    148s
  • max time network
    149s
  • platform
    windows7_x64
  • resource
    win7-20240705-en
  • resource tags

    arch:x64arch:x86image:win7-20240705-enlocale:en-usos:windows7-x64system
  • submitted
    19-07-2024 13:49

General

  • Target

    831ef42dfd54d0697baf05d276538eef4eef184569b4df67a076d15993288749.exe

  • Size

    234KB

  • MD5

    733a03ea40d8f226ebcec8fe9ae18fa6

  • SHA1

    00c635d4b74fdf6946b6b675f593d9d99dce22c2

  • SHA256

    831ef42dfd54d0697baf05d276538eef4eef184569b4df67a076d15993288749

  • SHA512

    55f25760f16fe47f4aec2ea6f6ebf148b4989e718f9830f77e3338c8bad3c18e81233caa8b9478fb9f596e8f700738f5b84cf413bc4814f07a5bbad192f9b0a0

  • SSDEEP

    6144:ArLRRRGOgjjnm3lgYrreMfpaVRQQKBWj:AnBGOQjnmuKrxfpcvKE

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) 2 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).

  • Event Triggered Execution: Netsh Helper DLL 1 TTPs 3 IoCs

    Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\831ef42dfd54d0697baf05d276538eef4eef184569b4df67a076d15993288749.exe
    "C:\Users\Admin\AppData\Local\Temp\831ef42dfd54d0697baf05d276538eef4eef184569b4df67a076d15993288749.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2264
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\lfizwrwy\
      2⤵
        PID:2940
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\oiiadnrd.exe" C:\Windows\SysWOW64\lfizwrwy\
        2⤵
          PID:1080
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create lfizwrwy binPath= "C:\Windows\SysWOW64\lfizwrwy\oiiadnrd.exe /d\"C:\Users\Admin\AppData\Local\Temp\831ef42dfd54d0697baf05d276538eef4eef184569b4df67a076d15993288749.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2524
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description lfizwrwy "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3032
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start lfizwrwy
          2⤵
          • Launches sc.exe
          PID:2148
        • 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
          • Event Triggered Execution: Netsh Helper DLL
          PID:2660
      • C:\Windows\SysWOW64\lfizwrwy\oiiadnrd.exe
        C:\Windows\SysWOW64\lfizwrwy\oiiadnrd.exe /d"C:\Users\Admin\AppData\Local\Temp\831ef42dfd54d0697baf05d276538eef4eef184569b4df67a076d15993288749.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2832
        • 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:2692

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        10.1MB

        MD5

        a0c027935c0139358c7238d7b10ecbc2

        SHA1

        012cf5fac66e806983865abc42f5072b23230afa

        SHA256

        24b18da191a3dfbc315e1e06b23f01a0f3efed268652fcd5f776332a5bbb0001

        SHA512

        4218951a203781dc62d4625418f9e4bcf0783530b6bc551ac00552bccd52c019d35fb3df08ca8614cc0025962b261f9f7bb3213a699088e8e34ab656426c6dc9

      • memory/2264-2-0x0000000000400000-0x0000000002082000-memory.dmp
        Filesize

        28.5MB

      • memory/2264-3-0x0000000000400000-0x0000000002082000-memory.dmp
        Filesize

        28.5MB

      • memory/2264-7-0x0000000000400000-0x0000000002082000-memory.dmp
        Filesize

        28.5MB

      • memory/2692-44-0x0000000000140000-0x0000000000150000-memory.dmp
        Filesize

        64KB

      • memory/2692-43-0x0000000000140000-0x0000000000150000-memory.dmp
        Filesize

        64KB

      • memory/2692-11-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB

      • memory/2692-9-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2692-28-0x0000000000140000-0x0000000000150000-memory.dmp
        Filesize

        64KB

      • memory/2692-16-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2692-18-0x0000000001900000-0x0000000001B0F000-memory.dmp
        Filesize

        2.1MB

      • memory/2692-25-0x0000000000140000-0x0000000000150000-memory.dmp
        Filesize

        64KB

      • memory/2692-22-0x0000000000130000-0x0000000000136000-memory.dmp
        Filesize

        24KB

      • memory/2692-21-0x0000000001900000-0x0000000001B0F000-memory.dmp
        Filesize

        2.1MB

      • memory/2692-48-0x0000000000150000-0x0000000000155000-memory.dmp
        Filesize

        20KB

      • memory/2692-49-0x0000000005750000-0x0000000005B5B000-memory.dmp
        Filesize

        4.0MB

      • memory/2692-53-0x0000000000160000-0x0000000000167000-memory.dmp
        Filesize

        28KB

      • memory/2692-45-0x0000000000150000-0x0000000000155000-memory.dmp
        Filesize

        20KB

      • memory/2692-14-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2692-12-0x0000000000080000-0x0000000000095000-memory.dmp
        Filesize

        84KB

      • memory/2692-42-0x0000000000140000-0x0000000000150000-memory.dmp
        Filesize

        64KB

      • memory/2692-52-0x0000000005750000-0x0000000005B5B000-memory.dmp
        Filesize

        4.0MB

      • memory/2692-41-0x0000000000140000-0x0000000000150000-memory.dmp
        Filesize

        64KB

      • memory/2692-40-0x0000000000140000-0x0000000000150000-memory.dmp
        Filesize

        64KB

      • memory/2692-39-0x0000000000140000-0x0000000000150000-memory.dmp
        Filesize

        64KB

      • memory/2692-38-0x0000000000140000-0x0000000000150000-memory.dmp
        Filesize

        64KB

      • memory/2692-36-0x0000000000140000-0x0000000000150000-memory.dmp
        Filesize

        64KB

      • memory/2692-35-0x0000000000140000-0x0000000000150000-memory.dmp
        Filesize

        64KB

      • memory/2692-34-0x0000000000140000-0x0000000000150000-memory.dmp
        Filesize

        64KB

      • memory/2692-33-0x0000000000140000-0x0000000000150000-memory.dmp
        Filesize

        64KB

      • memory/2692-32-0x0000000000140000-0x0000000000150000-memory.dmp
        Filesize

        64KB

      • memory/2692-31-0x0000000000140000-0x0000000000150000-memory.dmp
        Filesize

        64KB

      • memory/2692-30-0x0000000000140000-0x0000000000150000-memory.dmp
        Filesize

        64KB

      • memory/2692-37-0x0000000000140000-0x0000000000150000-memory.dmp
        Filesize

        64KB

      • memory/2692-29-0x0000000000140000-0x0000000000150000-memory.dmp
        Filesize

        64KB

      • memory/2832-15-0x0000000000400000-0x0000000002082000-memory.dmp
        Filesize

        28.5MB