Analysis

  • max time kernel
    121s
  • max time network
    122s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231222-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231222-enlocale:en-usos:windows10-2004-x64system
  • submitted
    04/02/2024, 17:03

General

  • Target

    8fb0dc9809505c372d3a9145cad1f184.exe

  • Size

    97KB

  • MD5

    8fb0dc9809505c372d3a9145cad1f184

  • SHA1

    d4b1b0a39e16afdcc542f7c3269308867eb1275b

  • SHA256

    00e752aae95f201347308a869803bed8104e5167aa2f8a16ff0efd97d6b180f0

  • SHA512

    6bf44c51d4dd35cbeab22e8bc5b6d335ec5619f5f48e80b967211e9ad08b4e269ac305ed7bc0e7fa97d0095bbbdf9aa5974635f02dc08baf0a33b11915812454

  • SSDEEP

    3072:C7mW2cZ8UtE2UvMzSKMLTQ7ja8qULZsJ8r:CKWfo5yo3Q7ja8qe

Malware Config

Signatures

  • Executes dropped EXE 1 IoCs
  • Loads dropped DLL 2 IoCs
  • UPX packed file 2 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • Adds Run key to start application 2 TTPs 1 IoCs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Installs/modifies Browser Helper Object 2 TTPs 3 IoCs

    BHOs are DLL modules which act as plugins for Internet Explorer.

  • Drops file in Program Files directory 3 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies registry class 64 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of SetWindowsHookEx 4 IoCs
  • Suspicious use of WriteProcessMemory 12 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\8fb0dc9809505c372d3a9145cad1f184.exe
    "C:\Users\Admin\AppData\Local\Temp\8fb0dc9809505c372d3a9145cad1f184.exe"
    1⤵
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:396
    • C:\Windows\SysWOW64\regsvr32.exe
      regsvr32 /s "C:\Program Files (x86)\PostTip\PostTip.dll"
      2⤵
      • Loads dropped DLL
      • Installs/modifies Browser Helper Object
      • Modifies registry class
      PID:4464
    • C:\Program Files (x86)\PostTip\PostTip.exe
      "C:\Program Files (x86)\PostTip\PostTip.exe"
      2⤵
      • Executes dropped EXE
      • Adds Run key to start application
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:1508
      • C:\Windows\SysWOW64\regsvr32.exe
        regsvr32 /s "C:\Program Files (x86)\PostTip\PostTip.dll"
        3⤵
        • Loads dropped DLL
        • Installs/modifies Browser Helper Object
        • Modifies registry class
        PID:2932
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c \DelUS.bat
      2⤵
        PID:1188

    Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

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          Downloads

          • C:\DelUS.bat

            Filesize

            243B

            MD5

            87b0d16ac4822a4ff5a82418e3e05eeb

            SHA1

            4634910ce53b434a5a86118a953ed6a857c1b187

            SHA256

            b7d8e4b5143990b7de490f67ae22b6fad1161d84eaf6ba8367d0bcbb7e8e4ba6

            SHA512

            883d3ff3a4f7077a99cb1bd7b1e9034beb1736f712ab54e33ba7afaf0f6bb89d4a9894de78e7d574dce4d61801778ba1a9cce4b0f523842573f4f0bbd3e204b1

          • C:\Program Files (x86)\PostTip\PostTip.dll

            Filesize

            162KB

            MD5

            dc62c2f61a803bd1292b0b169fa6f8d9

            SHA1

            117ecef652f645ab87a611eab5bc16ae085d6ffb

            SHA256

            7434776f552dde651370f0e43026def6c56c412eb1c62d5214406b34144319af

            SHA512

            55f22c83fcfccf10bb799af214b456392f43b7c394a7dcebbe2fe7059c65ba2fad859c9709b4ca2ab28ab55f03e054196a5b3857a0ec09c3b603a3458cb212d1

          • C:\Program Files (x86)\PostTip\PostTip.exe

            Filesize

            38KB

            MD5

            c2b5be376cac31c0b01603105ae4ea89

            SHA1

            4fcfa0181ca5478103c6999199957be40f4a937b

            SHA256

            8ec9ca043b655d4bf868ccd7d9d5fdd4e23ad8610aed2fb983370437b7851feb

            SHA512

            d17e798a414a6d2295f13339a10151f2a34cff5a7d6c81862c26a0c4ac831bf9f867f9f2bf028fa15f189a93f8d8883a334a9857a33bcabac916376267c9da72

          • memory/396-0-0x0000000000400000-0x0000000000448000-memory.dmp

            Filesize

            288KB

          • memory/396-11-0x0000000000400000-0x0000000000448000-memory.dmp

            Filesize

            288KB