Windows 7 deprecation

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Analysis

  • max time kernel
    150s
  • max time network
    148s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
  • submitted
    31/12/2023, 12:51

General

  • Target

    36c4f2289cbfeb319219743392141a67.exe

  • Size

    1.0MB

  • MD5

    36c4f2289cbfeb319219743392141a67

  • SHA1

    4b2b2f483e3e2663c0be603817bc038cce4941ed

  • SHA256

    2f7c4ee4fde198e54e5f29ef1eafe326bda0f24f21bb4bf36e6416d32e75d246

  • SHA512

    3f3c9472397055e44ecf6a14b34b07a0384e759cc4b618b33e994bd076271fdc2085078396b88ed33b5d4a07d6ddf61a75e90fc02e024d68539449a13ed6f52a

  • SSDEEP

    24576:+JeJfAKijp98zHpneTXdp9aepOBm1oc7KbvyFyK9:0eJfALGperduepOBm+c79

Score
10/10

Malware Config

Signatures

  • Modifies WinLogon for persistence 2 TTPs 1 IoCs
  • Disables RegEdit via registry modification 1 IoCs
  • Disables Task Manager via registry modification
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Enumerates connected drives 3 TTPs 23 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • Modifies WinLogon 2 TTPs 1 IoCs
  • AutoIT Executable 2 IoCs

    AutoIT scripts compiled to PE executables.

  • Drops file in System32 directory 5 IoCs
  • Drops file in Windows directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of WriteProcessMemory 12 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\36c4f2289cbfeb319219743392141a67.exe
    "C:\Users\Admin\AppData\Local\Temp\36c4f2289cbfeb319219743392141a67.exe"
    1⤵
    • Modifies WinLogon for persistence
    • Disables RegEdit via registry modification
    • Adds Run key to start application
    • Enumerates connected drives
    • Modifies WinLogon
    • Drops file in System32 directory
    • Drops file in Windows directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:4840
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /C AT /delete /yes
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3428
      • C:\Windows\SysWOW64\at.exe
        AT /delete /yes
        3⤵
          PID:4420
      • C:\Windows\SysWOW64\cmd.exe
        C:\Windows\system32\cmd.exe /C AT 09:00 /interactive /EVERY:m,t,w,th,f,s,su C:\Windows\system32\winhelp.exe
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:1904
    • C:\Windows\SysWOW64\at.exe
      AT 09:00 /interactive /EVERY:m,t,w,th,f,s,su C:\Windows\system32\winhelp.exe
      1⤵
        PID:3384

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

      • C:\Windows\SysWOW64\winhelp.exe

        Filesize

        1.0MB

        MD5

        36c4f2289cbfeb319219743392141a67

        SHA1

        4b2b2f483e3e2663c0be603817bc038cce4941ed

        SHA256

        2f7c4ee4fde198e54e5f29ef1eafe326bda0f24f21bb4bf36e6416d32e75d246

        SHA512

        3f3c9472397055e44ecf6a14b34b07a0384e759cc4b618b33e994bd076271fdc2085078396b88ed33b5d4a07d6ddf61a75e90fc02e024d68539449a13ed6f52a

      • memory/4840-0-0x0000000000400000-0x00000000004A1000-memory.dmp

        Filesize

        644KB